Multiple systems as a source of false positives in exo-planet detections
|
|
- Sherman Parks
- 5 years ago
- Views:
Transcription
1 Multiple systems as a source of false positives in exo-planet detections Andrei Tokovinin ( (NOAO/CTIO) Jean-Louis Halbwachs (Observatoire de Strasbourg) Astrometric companion to Zeta Aqr-A imaged at SOAR May 2013, Marseille 1
2 Outline Review of multiplicity statistics History Sample of F,G dwarfs within 67pc Companion detection limits Distribution of periods and mass ratios Statistics of hierarchies Focus on binary secondaries (false positives?) Only ~ 10% of solar-type stars have 2 companions, but about 2% may be false-positives May 2013, Marseille 2
3 Multiplicity statistics in the solar neighborhood 1924 Öpik, Multiple stars seem to represent the general rule in our stellar universe 1976 Abt & Levy Bright stars, sgle:dble:triple:4uple = 42:46:9:2 % 1991 Duquennoy & Mayor 22pc, 164**, 57 % of G- dwarf primaries have a companion with q > Tokovinin MSC catalogue; 612 multiple systems 2010 Raghavan et al. 454** 25pc, sgle:dble:triple:4uple = 56:33:8:3 % 2013? Tokovinin et al. New sample 5000** 67pc Multiplicity statistics is still a challenge! May 2013, Marseille 3
4 Three ways to study statistics Sample, get them all (Raghavan et al. 2010) Sample, corrected for incompleteness (FG-67pc sample, 2013) Use catalogs (uncertain selection!) May 2013, Marseille 4
5 More on the FG-67 sample 4846 systems from Hipparcos: 0.5 < V-I <0.8 Plx >15 mas +/-10% Triple: ~8.5% Quadruple etc: ~2.5% Complete! Un-evolved May 2013, Marseille 5
6 Raw numbers in the FG-67pc Single, binary, triple, quadr = 3083, 1422, 285, 51 Hierarchical level Number The raw numbers must be corrected for selection May 2013, Marseille 6
7 Companion detection: Speckle & AdaptiveOptic AO (8-m): ΔK<7, ρ>0.05 (only a small subset) Speckle (4-m): ΔI<5.3, ρ>0.03 (y), (I) K-band AO 2MASS May 2013, Marseille 7
8 Speckle detects binary secondaries New triple HIP How many secondary companions are actually close pairs? May 2013, Marseille 8
9 Robo-AO survey at Palomar Laser Guide Star system at 1.5-m, robotic In progress, ~400 targets covered in 2012B Try resolving (faint) secondary companions May 2013, Marseille 9
10 Binaries from astrometry resolved with Gemini-S NearInfraredCoronImager: NaturalGuideStar AO system, 2 λ simult. 104 targets surveyed, ~33% resolved (AJ, 2013, submitted) Unexpected binaries May 2013, Marseille 10
11 Coverage of the parameter space ~78% detection May 2013, Marseille 11
12 Distribution of all companions Unknown periods 257 SB without orbit 142 SB & astrometric 244 astrometric 50% detection May 2013, Marseille 12
13 Period distribution (all pairs) FG-67 Raghavan et al. (2010) May 2013, Marseille 13
14 /! Fitted models /! Frequency of binaries in space : /!\ Preliminary results 1 + β f(p,q)= ε q β exp[-(x-x 0 ) 2 /(2σ 2 )] σ (2π ) X = log 10 (P/1d) ε = fract of binaries Selection effects applied to simulated binaries parameters adjusted by ML Case ε x 0 σ β Level 1 (f M ) All pairs (f C ) f M =fract of n-sngl syst f C = N companion /N prim target When the selection effects are neglected: Fraction of non-single systems, f M = ( ) / 4841 = Average number of companions per primary target, f C = 2145/4841 = May 2013, Marseille
15 Fitted models /! /!\ Preliminary results 1 + β f(p,q)= ε q β exp[-(x-x 0 ) 2 /(2σ 2 )] σ (2π ) X = log 10 (P/1d) ε = fract of syst. Selection effects applied to simulated binaries parameters adjusted by ML Case f M ε x 0 σ β Level Level f M =fract of systems with respect to the upper level May 2013, Marseille
16 Statistical model of hierarchies Select inner and outer systems from the generating distribution, keep only stable combinations log(p L /P S) > depending on eccentricity May 2013, Marseille 16
17 Period distribution, level 11 For dynamical stability, P out /P in > 4.7 (1 e L ) -1.8 (1+e L ) 0.6 (1+q out )0.1 Inner binaries can t have periods as long as the outer ones May 2013, Marseille 17
18 Fitted models /! /!\ Preliminary results 1 + β f(p,q)= ε q β exp[-(x-x 0 ) 2 /(2σ 2 )] σ (2π ) X = log 10 (P/1d) ε = fract of syst. Introduction of a cut-off in period after generation of the components at level 11 and 12 Case ε x 0 σ β Level 11 (0.21) Generate Generate May 2013, Marseille
19 Analytical estimates of sub-system system frequency Double integral of fitted models over outer and inner periods, in desired P intervals Fraction of level 11 (all P): 0.10 Fraction of level 12 for outer period<10 5 d: 0.030, but when systems with level 11 are discarded This model can be used for first-order evaluation of false positives in exo-planet work. Include mass ratio, if necessary. May 2013, Marseille 19
20 HIP 11072: a potential false positive HIP = HR 695 = κ For at 20pc. P=25.8yr ΔI=3.7 m B is a binary! P~ 3.7 days Lines of Ba,Bb are detected Would be a problem if P~1yr Tokovinin 2013 AJ, 145, 76 May 2013, Marseille 20
21 Exo-planets or binary secondaries? HIP (Chauvin et al. 2011): 72-yr astrometric binary resolved. Planet around A, P=3.6yr. Or Ba,Bb? HD (T.Roell et al. 2010): F8V+M3V at 2. B is a binary (resolved), P 682 d, close to P planet =536 d. HIP 12184: New companion at 0.5 discovered with RoboAO. Is it binary, too, or is the 335-d planet real? CONCLUSION: Focus on binary secondaries May 2013, Marseille 21
A Survey of Stellar Families Multiplicity of Solar-type Stars
A Survey of Stellar Families Multiplicity of Solar-type Stars Advisor: Dr. Hal McAlister GSU Committee members: Dr. Doug Gies GSU Deepak Raghavan Ph.D. Dissertation Talk March 17, 2009 Dr. Todd Henry GSU
More informationFROM BINARIES TO MULTIPLES II: HIERARCHICAL MULTIPLICITY OF F AND G DWARFS
Draft version January 24, 2014 Preprint typeset using L A TEX style emulateapj v. 08/13/06 FROM BINARIES TO MULTIPLES II: HIERARCHICAL MULTIPLICITY OF F AND G DWARFS Andrei Tokovinin Cerro Tololo Inter-American
More informationarxiv: v1 [astro-ph.sr] 27 Jan 2014
Draft version March 6, 2018 Preprint typeset using L A TEX style emulateapj v. 5/2/11 FROM BINARIES TO MULTIPLES II: HIERARCHICAL MULTIPLICITY OF F AND G DWARFS Andrei Tokovinin Cerro Tololo Inter-American
More informationSpectroscopic orbits of 10 nearby solar-type dwarfs
doi:10.1093/mnras/stu743 Spectroscopic orbits of 10 nearby solar-type dwarfs N. A. Gorynya 1,2 and A. Tokovinin 3 1 Institute of Astronomy of Russian Academy of Science, 48 Pyatnitskaya Str, 109017 Moscow,
More informationarxiv: v2 [astro-ph.sr] 3 Jan 2018
Mon. Not. R. Astron. Soc. 000, 1 7 (2018) Printed 8 January 2018 (MN LATEX style file v2.2) Spectroscopic orbits of nearby solar-type dwarfs. II. arxiv:1712.06389v2 [astro-ph.sr] 3 Jan 2018 N. A. Gorynya
More informationZelenchukskaya region, Karachai-Cherkesia, Russia H.FALCKE, R.OSTERBART, M.SCH OLLER AND G.WEIGELT
SPECKLE MASKING IMAGING OF THE SPECTROSCOPIC BINARIES GLIESE 150.2 AND 41 DRACONIS I.BALEGA AND Y.BALEGA Special Astrophysical Observatory Zelenchukskaya region, Karachai-Cherkesia, 357147 Russia AND H.FALCKE,
More informationarxiv: v1 [astro-ph] 3 Sep 2008
Astrophysical Bulletin, vol. 63, No.3, 2008, pp.278-289 September 3, 2008 Translated from Astrofizicheskij Byulleten, vol.63, No.3, 2008, pp. 298-310 Speckle Interferometry of Metal-Poor Stars in the Solar
More informationDynamics of Multiple Stars: Observations
Massive Stars in Interacting Binaries ASP Conference Series, Vol. 367, 2007 N. St-Louis & A.F.J. Moffat Dynamics of Multiple Stars: Observations A. Tokovinin Cerro Tololo Inter-American Observatory, Casilla
More informationMASS DETERMINATIONS OF POPULATION II BINARY STARS
MASS DETERMINATIONS OF POPULATION II BINARY STARS Kathryn E. Williamson Department of Physics and Astronomy, The University of Georgia, Athens, GA 30602-2451 James N. Heasley Institute for Astronomy, University
More informationStatistics of spectroscopic sub-systems in visual multiple stars
A&A 382, 118 123 (2002) DOI: 10.1051/0004-6361:20011586 c ESO 2002 Astronomy & Astrophysics Statistics of spectroscopic sub-systems in visual multiple stars A. A. Tokovinin 1,2 andm.g.smekhov 2 1 Cerro
More informationDEPARTMENT OF PHYSICS AND ASTRONOMY. Planets around white dwarfs Matt Burleigh
DEPARTMENT OF PHYSICS AND ASTRONOMY Planets around white dwarfs Matt Burleigh Contents Original motivation DODO - results from our direct imaging survey Where do we go next? The role for E-ELT Direct imaging
More informationMultiplicity among solar type stars. III. Statistical properties of the F7 K binaries with periods up to 10 years
A&A 397, 159 175 (2003) DOI: 10.1051/0004-6361:20021507 c ESO 2003 Astronomy & Astrophysics Multiplicity among solar type stars III. Statistical properties of the F7 K binaries with periods up to 10 years
More informationKozai-Lidov oscillations
Kozai-Lidov oscillations Kozai (1962 - asteroids); Lidov (1962 - artificial satellites) arise most simply in restricted three-body problem (two massive bodies on a Kepler orbit + a test particle) e.g.,
More informationarxiv: v1 [astro-ph.sr] 18 Apr 2012
Revealing companions to nearby stars with astrometric acceleration 1 arxiv:1204.4206v1 [astro-ph.sr] 18 Apr 2012 Andrei Tokovinin Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile
More informationBinary Stars. Jean-Louis Halbwachs Strasbourg Observatory. Summary
Binary Stars Jean-Louis Halbwachs Strasbourg Observatory Summary 1. The double star zoo : visual binaries (wide and orbital), astrometric b., spectroscopic b., eclipsing b.. General description and physical
More informationThe Kepler Legacy Continues: A Catalog of K2 Planets David R. Ciardi NExScI/Caltech
The Kepler Legacy Continues: A Catalog of K2 Planets David R. Ciardi NExScI/Caltech I A N J. M. C R O S S F I E L D, E R I K A. P E T I G U R A, E V A N S I N U K O F F, J O S H U A E. S C H L I E D E
More informationSynergies between E-ELT and space instrumentation for extrasolar planet science
Synergies between E-ELT and space instrumentation for extrasolar planet science Raffaele Gratton and Mariangela Bonavita INAF Osservatorio Astronomico di Padova - ITALY Main topics in exo-planetary science
More informationBINARIES AT LOW METALLICITY
Sara Lucatello INAF Padova Astronomical Observatory BINARIES AT LOW METALLICITY Why we care, what we know, what we do not know and what we are doing to improve that The first stars and the evolution of
More informationDirect imaging of extra-solar planets
Chapter 6 Direct imaging of extra-solar planets Direct imaging for extra-solar planets means that emission from the planet can be spatially resolved from the emission of the bright central star The two
More informationExtrasolar Planets. Methods of detection Characterization Theoretical ideas Future prospects
Extrasolar Planets Methods of detection Characterization Theoretical ideas Future prospects Methods of detection Methods of detection Methods of detection Pulsar timing Planetary motion around pulsar
More informationAstrometric Orbits and Masses for Three Low-Mass Binaries
Astrometric Orbits and Masses for Three Low-Mass Binaries Hugh C. Harris, 1, Conard C. Dahn, 1, Trent J. Dupuy 2 1 U.S. Naval Observatory, 10391 West Naval Observatory Road, Flagstaff, Arizona, USA 86001
More informationParallaxes with Hubble Space Telescope
Parallaxes with Hubble Space Telescope How Bayes (and Bill) Helped G. Fritz Benedict and Barbara E. McArthur McDonald Observatory 10 June 2004 University of Texas 1 Outline Astrometry with HST A Recent
More informationExoplanet Search Techniques: Overview. PHY 688, Lecture 28 April 3, 2009
Exoplanet Search Techniques: Overview PHY 688, Lecture 28 April 3, 2009 Course administration final presentations Outline see me for paper recommendations 2 3 weeks before talk see me with draft of presentation
More informationINTERNATIONAL ASTRONOMICAL UNION COMMISSION 26 (DOUBLE STARS) INFORMATION CIRCULAR No. 173 (FEBRUARY 2011) NEW ORBITS
INTERNATIONAL ASTRONOMICAL UNION COMMISSION 26 (DOUBLE STARS) INFORMATION CIRCULAR No. 173 (FEBRUARY 2011) NEW ORBITS ADS Name P T e Ω(2000) 2011 Author(s) α2000δ n a i ω Last ob. 2012 - FIN 333 33 y 31
More informationProper-motion binaries in the Hipparcos catalogue. Comparison with radial velocity data. A. Frankowski, S. Jancart, and A.
A&A 464, 377 392 (27) DOI: 1.151/4-6361:265526 c ESO 27 Astronomy & Astrophysics Proper-motion binaries in the Hipparcos catalogue Comparison with radial velocity data A. Frankowski, S. Jancart, and A.
More informationSTELLAR MULTIPLICITY AND ITS ROLE IN EXOPLANETARY SYSTEMS
STELLAR MULTIPLICITY AND ITS ROLE IN EXOPLANETARY SYSTEMS (2.8x2.8 ) Kepler pixel (4x4 ) Elliott Horch, SCSU KNOW THY STAR 10.10.2017 1 SOME POSSIBLE EFFECTS OF A SECOND STAR Formation: a Second Star could
More informationBinary and Mul,ple Stars
Binary and Mul,ple Stars Types of Mul,ple Systems Binaries Visual SB1 SB2 Triples Heirarchical Quadruples Trapezia T Tau triple system Kohler et al 2016 Observa,ons Imaging Rayleigh Limit: Resolu,on =
More informationA Survey of Stellar Families: Multiplicity of Solar-Type Stars
to appear in the Astrophysical Journal A Survey of Stellar Families: Multiplicity of Solar-Type Stars Deepak Raghavan 1,2, Harold A. McAlister 1, Todd J. Henry 1, David W. Latham 3, Geoffrey W. Marcy 4,
More informationPlanets Around M-dwarfs Astrometric Detection and Orbit Characterization
Planets Around M-dwarfs Page of 7 Planets Around M-dwarfs Astrometric Detection and Orbit Characterization N. M. Law (nlaw@astro.caltech.edu), S. R. Kulkarni, R. G. Dekany, C. Baranec California Institute
More informationarxiv:astro-ph/ v1 15 Dec 2004
How Dry is the Brown Dwarf Desert?: Quantifying the Relative Number of Planets, Brown Dwarfs and Stellar Companions around Nearby Sun-like Stars Daniel Grether 1 & Charles H. Lineweaver 1,2 arxiv:astro-ph/0412356
More informationA high-contrast adaptiveoptics imaging search for brown dwarfs
http://en.wikipedia.org/wiki/file: Albert_Abraham_Michelson2.jpg A high-contrast adaptiveoptics imaging search for brown dwarfs http://nexsci.caltech.edu/sagan/ Katie Morzinski UC Santa Cruz/Center for
More informationORBITS OF FOUR YOUNG TRIPLE-LINED MULTIPLE SYSTEMS
Draft version March 24, 2016 Preprint typeset using L A TEX style emulateapj v. 08/13/06 ORBITS OF FOUR YOUNG TRIPLE-LINED MULTIPLE SYSTEMS Andrei Tokovinin Cerro Tololo Inter-American Observatory, Casilla
More informationSPECTROSCOPIC SUBSYSTEMS IN NEARBY WIDE BINARIES
Draft version November 4, 2015 Preprint typeset using L A TEX style emulateapj v. 08/13/06 SPECTROSCOPIC SUBSYSTEMS IN NEARBY WIDE BINARIES Andrei Tokovinin Cerro Tololo Inter-American Observatory, Casilla
More informationRevealing the Fundamental Properties of Exoplanets and their Host Stars with Alopeke
Revealing the Fundamental Properties of Exoplanets and their Host Stars with Alopeke Steve B. Howell Chief, Space Science and Astrobiology Division NASA Ames Research Center Contributions by: Elliott Horch,
More informationInterferometric orbits of new Hipparcos binaries
Interferometric orbits of new Hipparcos binaries I.I. Balega 1, Y.Y. Balega 2, K.-H. Hofmann 3, E.V. Malogolovets 4, D. Schertl 5, Z.U. Shkhagosheva 6 and G. Weigelt 7 1 Special Astrophysical Observatory,
More informationObservations of extrasolar planets
Observations of extrasolar planets 1 Mercury 2 Venus radar image from Magellan (vertical scale exaggerated 10 X) 3 Mars 4 Jupiter 5 Saturn 6 Saturn 7 Uranus and Neptune 8 we need to look out about 10 parsecs
More informationAstrometric Detection of Exoplanets
Astrometric Detection of Exoplanets Angles & Coordinates: 1 full circle = 360 degrees 1 degree = 60 arcminutes 1 arcminute = 60 arcseconds ~ 1 inch @ 100 yards (2.908 cm at 100 meters) 1 milliarcsec (mas)
More informationNPOI Current Status and Recent Science
NPOI Current Status and Recent Science Ellyn Baines Naval Research Laboratory Navy Precision Optical Interferometer Joint project between NRL, Lowell Observatory, and USNO Observes in visible wavelengths
More informationSPECKLE INTERFEROMETRY AT SOAR IN 2014
Draft version June 10, 2015 Preprint typeset using L A TEX style emulateapj v. 08/13/06 SPECKLE INTERFEROMETRY AT SOAR IN 2014 Andrei Tokovinin Cerro Tololo Inter-American Observatory, Casilla 603, La
More informationarxiv: v1 [astro-ph.sr] 20 Mar 2017
Preprint 21 March 2017 Compiled using MNRAS LATEX style file v3.0 Formation of wide binary stars from adjacent cores Andrei Tokovinin Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile
More informationExploring the giant planet - brown dwarf connection with astrometry. Johannes Sahlmann ESA Research Fellow at ESAC
Exploring the giant planet - brown dwarf connection with astrometry ESA Research Fellow at ESAC Who s Who, Paris - 2 July 215 IS MASS A GOOD DEMOGRAPHIC INDICATOR? 2MASSWJ127334 393254 first image of a
More informationSub-systems in nearby solar-type wide binaries 1
Sub-systems in nearby solar-type wide binaries 1 Andrei Tokovinin Cerro Tololo Inter-American Observatory, Casilla 603, La Serena, Chile atokovinin@ctio.noao.edu Markus Hartung, and Thomas L. Hayward Gemini
More informationClassical Methods for Determining Stellar Masses, Temperatures, and Radii
Classical Methods for Determining Stellar Masses, Temperatures, and Radii Willie Torres Harvard-Smithsonian Center for Astrophysics 2010 Sagan Exoplanet Summer Workshop 1 Outline Basic properties of stars
More informationAdvisor : Prof. Hagai Perets. Israel Institute of Technology, Haifa
Secular Dynamics in Hierarchical Three-Body Systems with Mass Loss and MassErez Michaely Advisor : Prof. Hagai Perets Israel Institute of Technology, Haifa Context Systematically exploring triple systems
More informationarxiv: v1 [astro-ph.sr] 4 Nov 2015
Draft version July 18, 2018 Preprint typeset using L A TEX style emulateapj v. 5/2/11 SPECTROSCOPIC SUBSYSTEMS IN NEARBY WIDE BINARIES Andrei Tokovinin Cerro Tololo Inter-American Observatory, Casilla
More informationCHARA/NPOI 2013 Science & Technology Review MIRC Observations of the O-star Triple Sigma Orionis
MIRC Observations of the O-star Triple Sigma Orionis Gail Schaefer Doug Gies John Monnier Nils Turner New Title: Do NPOI and CHARA Orbits Agree?... stay tuned... Sigma Orionis Image credit: Peter Wienerroither
More informationGregg Hallinan NRAO & UC Berkeley E mail: Image credit: Hubble. January 2012 > Caltech
Gregg Hallinan NRAO & UC Berkeley E mail: gregg@astro.berkeley.edu Image credit: Hubble January 2012 > Caltech Astronomy with Adaptive Optics on Moderate sized Telescopes IUCAA, August 22 25, 2011 Mass-Luminosity
More informationHOW DRY IS THE BROWN DWARF DESERT? QUANTIFYING THE RELATIVE NUMBER OF PLANETS, BROWN DWARFS, AND STELLAR COMPANIONS AROUND NEARBY SUN-LIKE STARS
The Astrophysical Journal, 640:1051 1062, 2006 April 1 # 2006. The American Astronomical Society. All rights reserved. Printed in U.S.A. A HOW DRY IS THE BROWN DWARF DESERT? QUANTIFYING THE RELATIVE NUMBER
More informationSPHERE GTO Program S. Desidera On behalf of SPHERE GTO team
SPHERE GTO Program S. Desidera On behalf of SPHERE GTO team Aims Provide an overview of the SPHERE GTO program to have a clear view of what is already on-going GTO targets (for the requested observing
More informationInduced Eccentricities of Extra Solar Planets by Distant Stellar Companions
Induced Eccentricities of Extra Solar Planets by Distant Stellar Companions T. Mazeh Wise Observatory, Tel Aviv University, Tel Aviv, Israel Abstract. This paper explores the assumption that the high eccentricities
More informationSPECTROSCOPIC SUBSYSTEMS IN NEARBY WIDE BINARIES
2015. The American Astronomical Society. All rights reserved. doi:10.1088/0004-6256/150/6/177 SPECTROSCOPIC SUBSYSTEMS IN NEARBY WIDE BINARIES Andrei Cerro Tololo Inter-American Observatory, Casilla 603,
More informationFinding Extra-Solar Earths with Kepler. William Cochran McDonald Observatory
Finding Extra-Solar Earths with Kepler William Cochran McDonald Observatory Who is Bill Cochran? Senior Research Scien;st McDonald Observatory Originally interested in outer planet atmospheres Started
More informationAn Adaptive Optics Survey of M8-M9 stars: Discovery of 4 Very Low Mass Binaries With at Least One System Containing a Brown Dwarf Companion
Submitted Oct 30, 2001; accepted Jan 23, 2002, to be published in March 2002 ApJ Letters An Adaptive Optics Survey of M8-M9 stars: Discovery of 4 Very Low Mass Binaries With at Least One System Containing
More informationValidation of Transiting Planet Candidates with BLENDER
Validation of Transiting Planet Candidates with BLENDER Willie Torres Harvard-Smithsonian Center for Astrophysics Planet Validation Workshop, Marseille, 14 May 2013 2013 May 14 Planet Validation Workshop,
More informationResearch Note An old nearby quadruple system Gliese 225.2
Astronomy & Astrophysics manuscript no. gl2252 July 26, 2005 (DOI: will be inserted by hand later) Research Note An old nearby quadruple system Gliese 225.2 A. Tokovinin 1, O. Kiyaeva 2, M. Sterzik 3,
More informationCatalogues and parameters of orbital binaries
Catalogues and parameters of orbital binaries Oleg Malkov Institute of Astronomy, Moscow 1 Term Orbital binary is a visual binary with known orbital elements (and known distance) 2 Outline Goals Compilation
More informationFundamental (Sub)stellar Parameters: Surface Gravity. PHY 688, Lecture 11
Fundamental (Sub)stellar Parameters: Surface Gravity PHY 688, Lecture 11 Outline Review of previous lecture binary stars and brown dwarfs (sub)stellar dynamical masses and radii Surface gravity stars,
More informationThe AstraLux Survey of Planet Host Multiplicity
The AstraLux Survey of Planet Host Multiplicity Carolina Bergfors Max-Planck-Institut für Astronomie/ IoA Cambridge University of Cambridge, Institute of Astronomy, 17 July 2013 The AstraLux binary TEP
More informationAstrometry in Gaia DR1
Astrometry in Gaia DR1 Lennart Lindegren on behalf of the AGIS team and the rest of DPAC Gaia DR1 Workshop, ESAC 2016 November 3 1 Outline of talk The standard astrometric model kinematic and astrometric
More informationThe multi-messenger approach to particle acceleration by massive stars : a science case for optical, radio and X-ray observatories
The multi-messenger approach to particle acceleration by massive stars : a science case for optical, radio and X-ray observatories Michaël De Becker Space sciences, Technologies, and Astrophysics Research
More information100 µas Astrometry with Adap2ve Op2cs on Moderate- Sized Telescopes
100 µas Astrometry with Adap2ve Op2cs on Moderate- Sized Telescopes Drs. Richard Dekany and Nick Law Caltech Optical Observatories Workshop on Astronomy with Adaptive Optics on Moderate-Sized Telescopes
More informationPreliminary results on a Virtual Observatory search for companions to Luyten stars
Preliminary results on a Virtual Observatory search for companions to Luyten stars J. A. Caballero, F. X. Miret, J. Genebriera, T. Tobal, J. Cairol, D. Montes Abstract The Aladin sky atlas of the Virtual
More informationLecture 20: Planet formation II. Clues from Exoplanets
Lecture 20: Planet formation II. Clues from Exoplanets 1 Outline Definition of a planet Properties of exoplanets Formation models for exoplanets gravitational instability model core accretion scenario
More informationarxiv: v1 [astro-ph.sr] 27 Nov 2013
Mon. Not. R. Astron. Soc. 000, 1 45 (2013) Printed 17 September 2018 (MN LATEX style file v2.2) The VAST Survey III. The multiplicity of A-type stars within 75 pc arxiv:1311.7141v1 [astro-ph.sr] 27 Nov
More informationChapter 12 Stellar Evolution
Chapter 12 Stellar Evolution Guidepost Stars form from the interstellar medium and reach stability fusing hydrogen in their cores. This chapter is about the long, stable middle age of stars on the main
More informationDynamical investigations of the multiple stars
Open Astron. 217; 26: 64 71 Research Article Olga V. Kiyaeva* and Roman Ya. Zhuchkov Dynamical investigations of the multiple stars https://doi.org/1.1515/astro-217-19 Received Aug 18, 217; accepted Sep
More informationarxiv: v1 [astro-ph.sr] 3 Aug 2017
Draft version August 7, 2017 Preprint typeset using L A TEX style emulateapj v. 12/16/11 NEW ORBITS BASED ON SPECKLE INTERFEROMETRY AT SOAR. II. 1 Andrei Tokovinin Cerro Tololo Inter-American Observatory,
More informationThe Impact of Binary Companions on Planet Survival
The Impact of Binary Companions on Planet Survival Adam Kraus (UT-Austin) Trent Dupuy (Gemini Obs.), Michael Ireland (ANU), Andrew Mann (Columbia), Daniel Huber (Univ. of Hawaii) See: Kraus et al. (2016),
More informationarxiv: v1 [astro-ph.sr] 7 Jan 2013
Draft version December 11, 2013 Preprint typeset using L A TEX style emulateapj v. 12/16/11 KAPPA FORNACI, A TRIPLE RADIO-STAR 1 Andrei Tokovinin Cerro Tololo Inter-American Observatory, Casilla 603, La
More informationDetecting Extra Solar Planets
Detecting Extra Solar Planets The Extrasolar Planet Count Currently, 288 stars have been discovered to have planets. Some of these have more than one, so a total of 380 planets have been discovered as
More informationChoosing Suitable Target, Reference and Calibration Stars for the PRIMA Astrometric Planet Search
Astrometry in the Age of the Next Generation of Large Telescopes ASP Conference Series, Vol. 000, 2005 P. Kenneth Seidelmann and Alice K. B. Monet Choosing Suitable Target, Reference and Calibration Stars
More informationTen CORAVEL spectroscopic binary orbits of evolved stars
Astron. Astrophys. 346, 532 536 (1999) ASTRONOMY AND ASTROPHYSICS Ten CORAVEL spectroscopic binary orbits of evolved stars J.R. De Medeiros 1 and S. Udry 2 1 Departamento de Física, Universidade Federal
More informationAstr As ome tr tr ome y I M. Shao
Astrometry I M. Shao Outline Relative astrometry vs Global Astrometry What s the science objective? What s possible, what are fundamental limits? Instrument Description Error/noise sources Photon noise
More informationThe Impact of Gaia on Our Knowledge of Stars and Their Planets
The Impact of Gaia on Our Knowledge of Stars and Their Planets A. Sozzetti INAF Osservatorio Astrofisico di Torino Know thy star know thy planet conference pasadena, 11/10/2017 The impact of Gaia on our
More informationEvolution of Stars Population III: Population II: Population I:
Evolution of Stars 1. Formed from gas/dust cloud collapse from gravity 2. Fuse H to He on the Main Sequence. Then evolve off Main-sequence as they burn He and successive elements. 3. When nuclear fusion
More informationThe formation of binary stars
The formation of binary stars Motivation: Best testbed for star formation theory Report: Progress in observations and simulations And in memory of: Eduardo Delgado Donate 3.10.77-10.2.07 Progress in observations
More informationTHREE-BODY PROBLEM AND MULTIPLE STELLAR SYSTEMS
RevMexAA (Serie de Conferencias), 21, 147 151 (24) THREE-BODY PROBLEM AND MULTIPLE STELLAR SYSTEMS M. Valtonen 1 RESUMEN Las interacciones de tres cuerpos ocurren en cúmulos estelares, donde se dan encuentros
More informationMeasuring Radial Velocities of Low Mass Eclipsing Binaries
Measuring Radial Velocities of Low Mass Eclipsing Binaries Rebecca Rattray, Leslie Hebb, Keivan G. Stassun College of Arts and Science, Vanderbilt University Due to the complex nature of the spectra of
More informationin formation Stars in motion Jessica R. Lu Institute for Astronomy University of Hawaii
Stars in formation in motion Jessica R. Lu Institute for Astronomy University of Hawaii Stars in formation in motion 105 Msun 104 Msun 103 Msun Frontiers in star formation include massive young clusters
More informationNEARBY RED DWARFS & THEIR DANCE PARTNERS: THE MULTIPLICITY OF OUR LOW-MASS NEIGHBORS
NEARBY RED DWARFS & THEIR DANCE PARTNERS: THE MULTIPLICITY OF OUR LOW-MASS NEIGHBORS JEN WINTERS 3 July 2017 The MEarth Project Image Credit: www.freevector.com and AllSilhouettes.com MOTIVATION MOTIVATION
More informationIII The properties of extrasolar planets
III The properties of extrasolar planets (as of early 2016) http://sgoodwin.staff.shef.ac.uk/phy229.html 3.0 Introduction This lecture will discuss what we have found so far. It is important to remember
More informationCatalogues, parameters and distributions of orbital binaries
Catalogues, parameters and distributions of orbital binaries Oleg Malkov 1,2, Dmitry Chulkov 1 1 Institute of Astronomy of the Russ. Acad. Sci., 48 Pyatnitskaya Street, Moscow 119017, Russia 2 Faculty
More informationWhy Search for Extrasolar Planets?
Why Search for Extrasolar Planets? What is the diversity of habitats for life in the universe? Are Earth-like planets common or rare in our region of the galaxy? We have an elaborate and self-consistent
More informationCharacterization of the exoplanet host stars. Exoplanets Properties of the host stars. Characterization of the exoplanet host stars
Characterization of the exoplanet host stars Exoplanets Properties of the host stars Properties of the host stars of exoplanets are derived from a combination of astrometric, photometric, and spectroscopic
More informationHabitable exoplanets: modeling & characterization
Habitable exoplanets: modeling & characterization F. Selsis CNRS, Bordeaux, France flux at 10 pc (photons m -2 hr -1 µm -1 ) R. Wordsworth, F. Forget Laboratoire de Meteorologie Dynamique (LMD), Paris
More informationGl 86B: a white dwarf orbits an exoplanet host star
Mon. Not. R. Astron. Soc. 361, L15 L19 (2005) doi:10.1111/j.1745-3933.2005.00055.x Gl 86B: a white dwarf orbits an exoplanet host star M. Mugrauer and R. Neuhäuser Astrophysikalisches Institut, Universität
More informationNumerical Simulations of Star Cluster Formation. Matthew Bate
Numerical Simulations of Star Cluster Formation Matthew Bate http://www.astro.ex.ac.uk/people/mbate Typical molecular cloud Jeans mass 1 M, Opacity limit 3 MJ, P(k) k -4 Denser cloud Jeans mass 1/3 M Lower
More informationFundamental (Sub)stellar Parameters: Masses and Radii. PHY 688, Lecture 10
Fundamental (Sub)stellar Parameters: Masses and Radii PHY 688, Lecture 10 Outline Review of previous lecture brown dwarf effective temperatures finding cool brown dwarfs current problem: what are the coolest
More informationTHE PROGRAMME ACCURATE MASSES FOR SB2 COMPONENTS
SFA 17 C. Reylé, P. Di Matteo, F. Herpin, É. Lagadec, A. Lançon F. Royer (eds) THE PROGRAMME ACCURATE MASSES FOR SB COMPONENTS J.-L. Halbwachs 1, F. Arenou, H.M.J. Boffin 3, B. Famaey 1, A. Jorissen 4,
More informationGemini Planet Imager. Raphaël Galicher from presentations provided by James Graham and Marshall Perrin
Gemini Planet Imager from presentations provided by James Graham and Marshall Perrin Outline Ojectives The instrument Three examples of observations The GPI Exoplanet Survey 2 Objectives Radial velocity
More informationGemini NICI Planet-Finding Campaign: Statistical Constraints on Planet Populations
Gemini NICI Planet-Finding Campaign: Statistical Constraints on Planet Populations Eric L. Nielsen Institute for Astronomy University of Hawaii Michael Liu (IfA), Zahed Wahhaj (IfA), Beth A. Biller (MPIA),
More informationTrES Exoplanets and False Positives: Finding the Needle in the Haystack
Transiting Extrasolar Planets Workshop ASP Conference Series, Vol. 366, 2007 C. Afonso, D. Weldrake and Th. Henning TrES Exoplanets and False Positives: Finding the Needle in the Haystack F. T. O Donovan
More informationGaia Astrometry Upkeeping by GNSS - Evaluation Study [GAUGES]
Gaia Astrometry Upkeeping by GNSS - Evaluation Study [GAUGES] M. Gai, A. Vecchiato [INAF-OATo] A. Fienga, F. Vakili, J.P. Rivet, D. Albanese [OCA] Framework: Development of High Precision Astrometric Techniques
More informationASTRONOMY AND ASTROPHYSICS. Investigation of the Praesepe cluster. III. Radial velocity and binarity of the F5-K0 Klein-Wassink stars
Astron. Astrophys. 352, 479 488 (1999) Investigation of the Praesepe cluster III. Radial velocity and binarity of the F5-K0 Klein-Wassink stars J.-C. Mermilliod 1 and M. Mayor 2 1 Institut d Astronomie
More informationExtrasolar Planet Science with High-Precision Astrometry Johannes Sahlmann
Extrasolar Planet Science with High-Precision Astrometry Johannes Sahlmann Geneva Observatory The First Years Of ESO, Garching, 4.9.212 high-precision astrometry is powerful yields complete information,
More information2. Correlations between Stellar Properties
Hertzsprung-Russell (Colour-Magnitude) Diagram 2. Correlations between Stellar Properties 2.1 Mass-luminosity relationship (ZG: 12.2; CO: 7.3) Most stars obey L s = constant M s 3 < < 5 Exercise 2.1: Assuming
More informationHD An Am star showing both δ Scuti and γ Dor pulsations discovered through MOST photometry
Comm. in Asteroseismology Vol. 148, 2006 HD 114839 - An Am star showing both δ Scuti and γ Dor pulsations discovered through MOST photometry H. King 1, J.M. Matthews 1,J.F.Rowe 1, C.Cameron 1, R.Kuschnig
More informationFIRST RESULTS FROM THE CHARA ARRAY. V. BINARY STAR ASTROMETRY: THE CASE OF 12 PERSEI
The Astronomical Journal, 131:2695 2699, 2006 May # 2006. The American Astronomical Society. All rights reserved. Printed in U.S.A. FIRST RESULTS FROM THE CHARA ARRAY. V. BINARY STAR ASTROMETRY: THE CASE
More informationHD Transits HST/STIS First Transiting Exo-Planet. Exoplanet Discovery Methods. Paper Due Tue, Feb 23. (4) Transits. Transits.
Paper Due Tue, Feb 23 Exoplanet Discovery Methods (1) Direct imaging (2) Astrometry position (3) Radial velocity velocity Seager & Mallen-Ornelas 2003 ApJ 585, 1038. "A Unique Solution of Planet and Star
More informationExtreme AO Coronagraph Science with GPI. James R. Graham UC, Berkeley
Extreme AO Coronagraph Science with GPI James R. Graham UC, Berkeley Outline 2 ExAOC science impact Direct vs. indirect planet searches GPI experimental design Our knowledge of exoplanets defines AO design
More information