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Stellar analysis system (SAS*)

Stellar analysis system (SAS*) . T. Appourchaux Institut d’Astrophysique Spatiale , Orsay *SAS= Special Air Service or Son Altesse Sérénissime. Plan. The core programme Data level definition PDAS structure Data products Work packages and activities Summary. The core programme.

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Stellar analysis system (SAS*)

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  1. Stellar analysis system (SAS*) T. Appourchaux Institutd’AstrophysiqueSpatiale, Orsay *SAS= Special Air Service or Son AltesseSérénissime

  2. Plan • The core programme • Data leveldefinition • PDAS structure • Data products • Workpackages and activities • Summary

  3. The core programme • Sample 1: 20 000 dwarf and subgiant stars laterthan spectral type F5. (m < 11) • Sample 2: 1000 dwarfand subgiant stars laterthan spectral type F5. (m < 8, long duration) • Sample 3: 3000 dwarf and subgiant stars laterthan spectral type F5. (m < 8, step-and-stare) • Sample 4: 10,000 cool M dwarfs (m <16, 5,000 in long observations; m<15 5000 in step-and-stare) • Sample 5: 245 000 dwarf and subgiant stars laterthanspectral type F5.

  4. Level definition • Level 0: • Light curves, centroid curves, imagettes (NO instrumental correction) • Level 1: • Light curves with instrumental corrections (temperature, CCD, jitter) • Level 2: • Transit, stellar oscillation parameters, star and planet characteristics

  5. SAS tools Av. parameters Power spectrumanalysis DP3 Fit parameters Light Curves Stellargridmodels Stellarmodelling DP5 Ancillary Inversions Spots distribution Rotation / activity Input Physics Lowfreq. analysis DP4 Quality / validation Activitylevels

  6. Power spectrumfitting

  7. StellarProducts (DP3) • Solar-likepulsators: freq., ampl., lifetimes, degree, splitting, inclination angle, large freqseparation, smallfreqseparation,...(+errors) • Redgiants: same as above + a bit of below • Solartwins • Solar-like stars withplanets (inclination,...) • Open clusters: simultaneous fit (sameage, same composition) • Targets not included: • Classicalpulsators

  8. DP3 implementation • Input requiredfromStellar Science (M.-J.Goupil) • Ingest L1 data • Solar-likepulsators: Fourier, Classical MLE, Bayes if S/N low • Solartwins: same as solar-like • Solar-like stars withplanets (inclination,...): a drop of Bayes • Open clusters: simultaneous MLE fit • Product and quality assurance • Targets not included: • Classicalpulsators

  9. The example of Kepler Automaticfitting of solar-like stars

  10. StellarProducts (DP4) • Stellar rotation and activity: • rotation • spot modelling • inclination • Stellar noise: granulation(s), Harvey-like model • Input to power spectrumfitting

  11. DP4 implementation • Input requiredfromStellar Science (M.-J.Goupil) • Ingest L1 data • Stellar rotation and activity: • lowfrequencyperiodicity • follow-uprequired ? (Doppler imaging) • Stellar noise: granulation(s), Harvey-like model • Related to DP3 • Product and qualityassurance

  12. Stellarphysics (DP5) • Take DP3 and DP4 • Ingestancillary data: • Basic stellarproperties, ... • GAIA paralaxes • Rotational / Activityage • Stellarage, mass, radius • Inclination / rotation • Differential rotation • Composition • Structure (convective core,…)

  13. DP5 implementation • Input requiredfromStellar Science (M.-J.Goupil) • Grid of models • Criteria for agreement • Surface effects (what do we do?) • Differentmodels... • Different oscillation codes • Product and quality assurance

  14. Activities • Definition: • KO in Paris 9-10 Nov. • UntilJune 2011, thenDecember 2011 if selected • Implementation: • From 2012 to end 2018 • Operations: • From 2019 to 2023

  15. Summary • StellarAnalysis System willimplement codes for fittingspectra of the PLATO samples • Code mainlydedicated to solar-like oscillations • Free to set up ourown center for taking care of the other stars (classicalpulsators for instance)

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