TheThe GaiaGaia Catalogue:Catalogue: AA TreasureTreasure TroveTrove forfor PLATOPLATO 2.02.0 ScienceScience

A. Sozzetti INAF – Osservatorio Astrofisico di Torino

PLATO 2.0 Science Workshop ESA/ESTEC, 29 Jul 2013 GaiaGaia

th PLATOFirst 2.0 launch Science Workshop opportunity starts on NovemberESA/ESTEC, 17 , 2013! 29 Jul 2013 Gaia:Gaia: aa 1010 µµasas machine!machine!

At the V=20 survey limit: 1 billion stars observed!

PLATO 2.0 Science Workshop ESA/ESTEC, 29 Jul 2013 IntermediateIntermediate DataData ReleasesReleases

PLATO 2.0 Science Workshop ESA/ESTEC, 29 Jul 2013 PLATO 2.0 Science Workshop ESA/ESTEC, 29 Jul 2013 PLATO 2.0 Science Workshop ESA/ESTEC, 29 Jul 2013 GaiaGaia ScanningScanning LawLaw

PLATO 2.0 Science Workshop ESA/ESTEC, 29 Jul 2013 Hipparcos

1. 6 < G < 12: bright -star regime ( calibration errors , CCD saturation ) 2. 12 < G < 20: photon -noise regime ( sky -background and electronic noise at G ~ 20 mag )

PLATO 2.0 Science Workshop ESA/ESTEC, 29 Jul 2013 PLATO 2.0 Science Workshop ESA/ESTEC, 29 Jul 2013 GaiaGaia && PLATOPLATO 2.02.0

SynergiesSynergies

•• TargetTarget SelectionSelection

•• PlanetPlanet HostsHosts CharacterizationCharacterization

•• AstrophysicsAstrophysics ofof PlanetaryPlanetary SystemsSystems

PLATO 2.0 Science Workshop ESA/ESTEC, 29 Jul 2013 GaiaGaia forfor PLATOPLATO 2.02.0

•• RevisedRevised properproper motionsmotions ofof HipparcosHipparcos starsstars availableavailable asas earlyearly asas endend --ofof --20152015 •• OneOne yearyear later,later, >90%>90% ofof parallaxesparallaxes forfor allall starsstars obobservedserved byby GaiaGaia areare delivereddelivered …… •• ……alongalong withwith preliminarypreliminary infoinfo onon binaritybinarity •• PossiblePossible primaryprimary sourcesource ofof thethe PLATOPLATO inputinput catalogcatalog ofof >10>10 6 brightbright dwarfdwarf starsstars (with(with virtuallyvirtually zerozero contaminaticontaminationon fromfrom giants)giants) •• SignificantSignificant reductionreduction inin astrophysicalastrophysical falsefalse positipositivesves (know(know thythy neighboursneighbours !)!)

PLATO 2.0 Science Workshop ESA/ESTEC, 29 Jul 2013 GaiaGaia FocalFocal PlanePlane

PLATO 2.0 Science Workshop ESA/ESTEC, 29 Jul 2013 Crowding:Crowding: NotNot anan IssueIssue

Even in Baade ’s window, the sky will look not particularly crowded (G<20) One reads out pixels containing mostly sky background

PLATO 2.0 Science Workshop ESA/ESTEC, 29 Jul 2013 Bailer -Jones 2002

Santos et al. 2004

PLATO 2.0 Science Workshop ESA/ESTEC, 29 Jul 2013 PopulatingPopulating thethe PICPIC

• Large -scale simulations (all -sky) produced by DPAC ’s CU2 team

• Preliminary results: simple cutoffs in Mg and d allow to limit pollution to within <1% (with ALL later than F5V stars identified)

• Can do even better (<0.1%) using Teff/logg info from spectrophotometry

PLATO 2.0 Science Workshop ESA/ESTEC, 29 Jul 2013 CalibratingCalibrating thethe HostsHosts

• Bright (V<13) F -G-K stars (D<200 -300 pc) and not very faint (V<16) M dwarfs (D<50 -60 pc) will have distances determined to (sometimes much) better than 1%

• Very accurate determination of absolute luminosities (for lots of binaries too, many of them eclipsing!)

• -> Improved calibration of radii and masses of the stellar hosts of PLATO -detected planets, particularly at the bottom of the main sequence, where the disagreement between theory and observation is the most severe

• -> Reduced uncertainties on planetary parameters, for improved understanding of the systems ’ composition

PLATO 2.0 Science Workshop ESA/ESTEC, 29 Jul 2013 WorkWork inin ProgressProgress ……

PLATO 2.0 Science Workshop ESA/ESTEC, 29 Jul 2013 CharacterizingCharacterizing thethe SystemsSystems

• For ALL stars observed by PLATO, Gaia will provide info on low -mass companions out to several AUs

• Many of Gaia ’s planet detections will complement the knowledge of systems detected by PLATO (some components seen only by PLATO, some only by Gaia, some by both!)

• A three -fold goal will be achieved: extended phase coverage, a wider range of the parameter space (M, P, orientation) covered, improved characterization of global architecture of multiple systems

PLATO 2.0 Science Workshop ESA/ESTEC, 29 Jul 2013