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Stellar Analysis System: Comprehensive Study of Dwarf and Subgiant Stars

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The Stellar Analysis System (SAS) focuses on analyzing approximately 245,000 dwarf and subgiant stars, particularly those later than spectral type F5. The core program encompasses multiple work packages that cover solar-like pulsators, red giants, and stars with planets. It employs advanced techniques for power spectrum fitting, stellar rotation, and activity analysis, while ensuring product quality assurance. This initiative aims to provide insights into stellar properties, including mass, radius, and age, with a strong emphasis on effective data validation and scientific collaboration.

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Stellar Analysis System: Comprehensive Study of Dwarf and Subgiant Stars

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  1. Stellar analysis system (SAS*)WP370 T. Appourchaux Institutd’AstrophysiqueSpatiale, Orsay *SAS= Special Air Service or Son AltesseSérénissime

  2. Plan • The core programme • PDAS structure • Data products • Work packages and activities • Summary

  3. The core programme • Sample 1: 20 000 dwarf and subgiant stars laterthan spectral type F5. (m < 11) • Sample 2: 1000 dwarf and 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 laterthan spectral type F5.

  4. L1-:Transit removed

  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 +sine wave • 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 (compare with 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. Power spectrumanalysis Av. parameters DP3 Fit parameters Rotation / activity Quality / validation

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

  11. StellarProducts (DP4) • Input requiredfromStellar Science (M.-J.Goupil) • Stellarrotation and activity: • rotation • spot modelling • inclination • Stellar noise: granulation(s), Harvey-like model • Input to power spectrumfitting

  12. 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 quality assurance

  13. Power spectrumanalysis Rotation / activity Spots distribution Lowfreq. analysis DP4 Activitylevels Quality / validation

  14. 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,…)

  15. 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

  16. Power spectrumanalysis Av. parameters DP3 Fit parameters Stellargridmodels Stellarmodelling DP5 Inversions Rotation / activity Spots distribution Lowfreq. analysis DP4 Quality / validation Activitylevels

  17. Activities • Definition: • UntilJune 2011, thenDecember 2011 if selected • Implementation: • From 2012 to end 2018 • Operations: • From 2019 to 2023

  18. Summary • Close linkwithwith Science WPs • StellarAnalysis System willimplement codes for fittingspectra;extractingactivity / rotation; stellar mass, radius 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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