Exo-planet research from Space The ESA Picture

Transcription

1 Exo-planet research from Space The ESA Picture

2 Cosmic Vision is centered around four Grand Themes: 1. What are the conditions for planet formation and the emergence of life? From gas and dust to stars and planets From exo-planets to biomarkers Life and habitability in the Solar System 2. How does the Solar system work? 3. What are the Fundamental Physical Laws of the Universe? 4. How did the Universe originate and what is it made of? Proposed strategy: First: Next: In-depth analysis of terrestrial planets (Darwin / NIRI) Understand the conditions for star, planet and life formation (Far IR observatory / Solar Polar Orbiter) Later: Census of Earth-sized planets & explore Europa (Terrestrial Planet Astrometric Surveyor / Europa orbiter / lander) Finally: Image terrestrial exo-planet (beyond 2025) (Large Optical Interferometer)

3 First: In-depth analysis of Earth-like planets What strategy? Search for rocky planets and determine if they are common or rare Determine the physical conditions of and on these planets Determine whether these planets are in principle habitable Find out if these planets have life on them To place ourselves in context we need Comparative Planetology How do we do it?

4 The quest for Terrestrial exoplanets Significantly smaller than currently detected planets microlensing will start to pick up them -- if they exist! - No doubt that - RV requires 0.1 m/s (possible) over 3 years (1AU/G2V) with large telescope and no disturbing P-modes (6 month time scale m/s) This is for the Habitable Zone. Real problem is stellar activity Direct observation with next generation ELT s require: - 100m class telescopes! Can only work on G-stars to 18pc! (total number of 35 targets maximum!) - Bright star ==> contrast ratios of at subarcsec separation! - Requires diffraction control, wavefront quality (Strehl ratio), wavefront stability Planned ELT s can see young or massive Jovian planets. Earth would require working at below residual background This means that if we want to directly detect small rocky exoplanets we need to go to space!!

5 CoRoT Viewed as a European mission Convection Rotation Planetary Transit

6 Basics Two objectives 1. Detecting planets analogous to Earth (small and rocky) 2. Study stellar interiors through detection of p-modes and activity 600kg, 4.2m by 1.9m, 530W Pointing accuracy = 0. 2 Payload 300kg, Data rate 900Mb/day Nominal mission 2.5 years, Extended mission could add 3.5 years

7 Basics 2 Polar Orbit at 900 km Transits: objects per field magnitude data integrated for 16 minutes per readout Astroseismology: Hundred s of objects 6-9 magnitude Integrated for 32s per readout Organisation: CNES, ESA, Brazil, Spain, Germany, Austria, Belgium and ESA-ESTEC RSSD Ground control in Toulouse, Antennas in Kiruna, Brazil (Natal), and at CNES installations

8 Scientific Program Asteroseismology Exploratory program studies astroseismological properties for a large number of stellar types (0.5 mhz) Detailed program follows individual objects with high s/n for long periods (2-4 months) (0.1 mhz) Planetary transits 150 day observations of each field Color information Short periods allow small planets to be detected Plus additional science plus support program

9 HST Light Curves

10 JWST -- optimised for 10 µm HERSCHEL program Building on Spitzer legacy Unbiased search for Kuiper belts / exo-zodi in GT program of closest 80 FGK stars. Sensitivity is 1 Kuiper-belt around G2V at 10pc with S/N of 5 in ~30 min.

11 Darwin Mission direct observation!

12 Cosmic Vision Current status Implementation of current H2000+ program in preparation: GAIA: 2011/12 Bepi-Colombo: 2014? LISA/Pathfinder? Solar orbiter? CV1525 addresses four grand themes Call for proposals 2007 Call for one mission within small financial constraint for one larger mission for flight in ~2020 (Darwin?) 3 candidates for either will be selected for (further) study and will receive funding for technology development

13 Schedule CV call Release of call -- late Feb 2007 Letters of intent due -- March 2007 Briefing to proposers -- End of March 2007 Proposals due -- End of June 2007 Evaluation peer review -- July to end September 2007 Working group/ssac review and selection of 3 Class M missions and 3 Class L concept proposals -- October 2007

14 Schedule CV call M-Class ESA internal assessment -- until May 2008 Industrial Assessment -- June 2008 to August 2009 Mission Work Shop and down select to 2 M class October 2009 Defininition phase -- September 2011 Selection June 2012 Implementation

15 Schedule CV call L-Class ESA internal and industrial assessment focussed on technology and development of a technology development plan -- November 2007 to December 2010 Working group evaluation and selection of 2 mission concepts for Industrial Formulation Phase -- Jan 2011 to April 2011 Technology development of 2 mission L specific items June Feb 2013 Pre-selection -- February 2013 (partners indicated) Definition phase -- April 2013 to November 2014 Evaluation and prioritisation November 2014 to January 2015 Selection February 2015 (CaC November 2015) Implementation January 2016 to 2020+

16 Bio markers The goal is to find rocky planets with an atmosphere out of photo-chemical balance. (cf. Lederberg, 1965 and Lovelock, 1965) Working definition: Life O 3 + H 2 O + CO 2 Ideally, detect reduced molecules (CH 4, N 2 O) as well

17 DARWIN Target catalogue Single stars out to 25 pc: Spec. Type Number F 43 G 100 K 244 (incomplete) M 241 (incomplete) Total: 608 All missing late K and M stars within 25 pc will be found by GAIA in ~ 1.5 year of mission time because of large parallax and sensitivity (GAIA can observe down to R = 25 magnitude)

18 Status of Darwin Data processing study by Alcatel Alenia (F) End-to-end simulator development by EADS Astrium (D) Two parallel system studies by Alcatel Alenia (F) and EADS Astrium (D) Study Darwin in triangular or X-array formation (i.e. 3 or 4 tel.) 3 4 m class telescopes Spectral range: 6 20 µm Spectral resolution (120) A5 launch to L2 5 years nominal mission time + 5 years extended To be proposed by community for the Cosmic Vision as a major mission next summer (at the earliest)

19 DARWIN-Lite or Super-PEGASE First mission in CV1525 is too small an envelope for DARWIN proper (300 Meuro) CV plan allows for several (sub-)missions or experiments to answer a Theme Investigate Darwin-lite: Cheaper mission with less encompassing science case Smaller DARWIN or larger PEGASE: Where shall the twain meet? Outcome of initial study by Univ. of Liège: Science case not compelling Cost & complexity NOT significantly reduced! TE-SAT recommends NO Darwin-lite!

20 Status of the field GENIE: (ESA) ground-based nulling at VLTI: on hold (polarisation, CV approval) COROT: (F) transition search, large rocky planets: launch 2006 PRISMA: (S, D, F) 2 Free Flying techno precursor s/c for 35 M: launch 2008 KEPLER: (NASA) transition search, also for Earths: launch 2008 HERSCHEL: (ESA) dust levels in target systems: launch 2008 GAIA: (ESA) completion of star catalogue: launch 2011 / 12 SIM: (NASA) space interferometer: launch, 201? TPF-C: (NASA) space coronograph: on hold TPF-I: (NASA) nulling interferometer: on hold Darwin partner/counterpart

21 Darwin preparatory work Technology Research Program 5 Meuro in 2006, 4.5 Meuro in 2007 Expect similar funding during Cosmic Vision Major goal: realistic nulling breadboard Bring enabling technology in place HERSCHEL program Building on Spitzer legacy Unbiased search for Kuiper belts / exo-zodi in GT program of closest 80 FGK stars. Sensitivity is 1 Kuiper-belt around G2V at 10pc with S/N of 5 in ~30 min.

22 Where do we go from here? 0. Get DARWIN into Cosmic Vision program 1. Continue development of enabling technology 2. Broaden interest base: EUROPLANET, EU-Interferometry Solar system community Biology Paleontology Geophysics Technology development 3. Work on preparation Study of target systems: Kuiper-Edgeworth belts, exozodiacal dust, inclination, etc Models of planetary evolution