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Stellar Analysis System (SAS): Comprehensive Overview of Data Levels and Stellar Samples

The Stellar Analysis System (SAS) at the Institut d’Astrophysique Spatiale aims to analyze a variety of dwarf and subgiant stars, implementing sophisticated data processing and analysis protocols. With a focus on stellar oscillations and physical characteristics, this program includes specific sample sizes across different stellar types, from F5 subgiants to cool M-dwarfs. The data levels (0, 1, 2) illustrate light curve processing from raw to fully corrected and analyzed data. SAS tools facilitate the investigation of stellar activity and help in product and quality assurance to enhance stellar science.

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Stellar Analysis System (SAS): Comprehensive Overview of Data Levels and Stellar Samples

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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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