Science Alerts from GAIA. Simon Hodgkin Institute of Astronomy, Cambridge
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1 Science Alerts from GAIA Simon Hodgkin Institute of Astronomy, Cambridge Simon Hodgkin, IoA, Cambridge, UK 1 Discover the Cosmos, CERN, Sept
2 A word on nomenclature Definition of a science alert: science data that would have little or no value without quick interpretation, triggering additional (ground-based/space-based) follow up. SA : science alerts ASA : astrometric science alerts PSA : photometric science alerts SSA: spectroscopic science alerts Simon Hodgkin, IoA, Cambridge, UK 2 Discover the Cosmos, CERN, Sept
3 Simon Hodgkin, IoA, Cambridge, UK 3 Discover the Cosmos, CERN, Sept
4 Simon Hodgkin, IoA, Cambridge, UK Discover the Cosmos, CERN, Sept
5 Simon Hodgkin, IoA, Cambridge, UK Discover the Cosmos, CERN, Sept
6 Launch from Kourou on a Soyuz-Fregat in May 2013 for a 5yr mission Simon Hodgkin, IoA, Cambridge, UK Discover the Cosmos, CERN, Sept
7 Simon Hodgkin, IoA, Cambridge, UK 7 Discover the Cosmos, CERN, Sept
8 Chip transit: 4.4s Field transit (9 astrometric CCDs): 40s Simon Hodgkin, IoA, Cambridge, UK 8 Discover the Cosmos, CERN, Sept
9 EXPLORING THE OPTICAL TRANSIENT SKY WITH THE PALOMAR TRANSIENT FACTORY, Rau et al Simon Hodgkin, IoA, Cambridge, UK Discover the Cosmos, CERN, Sept
10 GRBs optical counterparts Potential Triggers R Coronae Borealis M-dwarf flares FU Orionis and similar Be stars Supernovae Microlensing events Asteroids Dwarf novae NEW THINGS?? Classical novae Lensed supernovae Simon Hodgkin, IoA, Cambridge, UK Discover the Cosmos, CERN, Sept
11 scientific opportunities: (i) SNe Ultra-luminous Surpernovae: Peculiar light curves, U band magnitude reaching -23, host galaxies faint, e.g. Quimby et al. (2010), link to the relationship between GRBs and SNe. Luminous Red Novae: bridge the gap between classical novae and supernovae - 4 known (e - capture in an AGB star? stellar merger? planet inspiral? etc, e.g. Kasliwal et al. 2011) Large unbiased samples of corecollapse supernovae: the role of environment. Simon Hodgkin, IoA, Cambridge, UK 11 Discover the Cosmos, CERN, Sept
12 scientific opportunities: (i) SNe 6000 SNe in 5 years = 3/day NB: the importance of local SNe for the calibration of the SNe cosmology project GAIA-C5-TN-IOA-SHO-001 Core-Collapse Supernovae from the Palomar Transient Factory: Indications for a Different Population in Dwarf Galaxies, Arcavi et al., 2010 Simon Hodgkin, IoA, Cambridge, UK 12 Discover the Cosmos, CERN, Sept
13 Finding anomalies is easy but classifying them usually requires a significant investment of follow-up telescope time, e.g. PANSTARRS and PTF. Typical scheme: multi-colour photometry, followed by low dispersion spectroscopy. Gaia is in an extremely good position: the simultaneous BP/ RP spectroscopy are perfect for source classification. Simon Hodgkin, IoA, Cambridge, UK 13 Discover the Cosmos, CERN, Sept
14 Database Science Alerts operation scheme Calibs. Photom. New Data Data Ingestion New Data arrive to Cambridge after basic pre-processing within 1 day and are stored Detection is run on data calibrated with the most recent calibration available Numerous detection algorithms are used SDSS 2MASS NED ASAS OGLE Photom. Asteroids Catalogues Flux Alert Detector Candidate Alerts Curator Gaia data Classifier Cross-match Classifier Detection Algorithms Candidate alerts are classified using Gaia data Sources are cross-matched with available catalogues and classified further Cross-matched asteroids are removed Alerts are stored on the Server and released Gaia Alerts Server + Gaia pre-launch Publisher VOEvent catalogue Simon Hodgkin, IoA, Cambridge, UK Discover the Cosmos, CERN, Sept
15 Timeline for the data flow 0 one operational day 24 d-1 d d+1 16h 8h visibility backlog real time acquisition Gaia 48 transmission MOC transmission SOC Madrid, Spain Initial Data Treatment First Look Astrometry (50 mas) Astrometry (100 µas) Figure courtesy Francois Mignard, updated by LW Science Alerts (Cambridge) PSA ASA? Simon Hodgkin, IoA, Cambridge, UK Discover the Cosmos, CERN, Sept
16 Simon Hodgkin, IoA, Cambridge, UK 16 Discover the Cosmos, CERN, Sept
17 Follow-up Facilities Simon Hodgkin, IoA, Cambridge, UK Discover the Cosmos, CERN, Sept
18 Simon Hodgkin, IoA, Cambridge, UK 18 Discover the Cosmos, CERN, Sept
19 research/gsawg/ Simon Hodgkin and Łukasz Wyrzykowski, IoA Cambridge UK Gaia Science Alerts Workshop II, IoA, June 2011
20 Opportunities braindump watch list: monitoring of known anomalous objects discovery + follow-up of new/ exotic kinds of phenomena zooniverse style projects (GalaxyZoo) to help us identify and classify transients social networking collaborative projects telescopes are already in the classroom scientific return improves the science Simon Hodgkin, IoA, Cambridge, UK Discover the Cosmos, CERN, Sept
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