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Stellar analysis system (SAS*) WP370
T. Appourchaux
Institut d’Astrophysique Spatiale, Orsay
*SAS= Special Air Service or Son Altesse Sérénissime
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Plan
• The core programme• PDAS structure• Data products• Work packages and activities• Summary
PLATO KO - Paris - November 2010
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The core programme
• Sample 1: 20 000 dwarf and subgiant stars later than spectral type F5. (m < 11)
• Sample 2: 1000 dwarf and subgiant stars later than spectral type F5. (m < 8, long duration)
• Sample 3: 3000 dwarf and subgiant stars later than 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 later than spectral type F5.
PLATO KO - Paris - November 2010
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4PLATO KO - Paris - November 2010
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L1-:Transit removed
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6PLATO KO - Paris - November 2010
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SAS tools
PLATO KO - Paris - November 2010
Power spectrum analysis
Stellar modelling
Rotation / activity
Quality / validation
Light Curves
Ancillary
Input Physics
Av. parameters
Fit parameters
Stellar grid models
Inversions
Spots distribution
Low freq. analysis
Activity levels
DP3
DP4
DP5
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Power spectrum fitting
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Stellar Products (DP3)
• Solar-like pulsators: freq., ampl., lifetimes, degree, splitting, inclination angle, large freq separation, small freq separation,...(+errors)
• Red giants: same as above + sine wave• Solar twins• Solar-like stars with planets (inclination,...)• Open clusters: simultaneous fit (same age, same composition)• Targets not included:
– Classical pulsators
PLATO KO - Paris - November 2010
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DP3 implementation
• Input required from Stellar Science (M.-J.Goupil)• Ingest L1 data (compare with L1- data)• Solar-like pulsators: Fourier, Classical MLE, Bayes if S/N low• Solar twins: same as solar-like• Solar-like stars with planets (inclination,...): a drop of Bayes• Open clusters: simultaneous MLE fit• Product and quality assurance• Targets not included:
– Classical pulsators
PLATO KO - Paris - November 2010
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Power spectrum analysis
Rotation / activity
Quality / validation
Av. parameters
Fit parameters
DP3
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The example of Kepler
Automatic fitting of solar-like stars
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Stellar Products (DP4)
• Input required from Stellar Science (M.-J.Goupil)• Stellar rotation and activity:
– rotation– spot modelling– inclination
• Stellar noise: granulation(s), Harvey-like model• Input to power spectrum fitting
PLATO KO - Paris - November 2010
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DP4 implementation
• Input required from Stellar Science (M.-J.Goupil)• Ingest L1 data• Stellar rotation and activity:– low frequency periodicity– follow-up required ? (Doppler imaging)
• Stellar noise: granulation(s), Harvey-like model– Related to DP3
• Product and quality assurance
PLATO KO - Paris - November 2010
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Power spectrum analysis
Rotation / activity
Quality / validation
Spots distribution
Low freq. analysis
Activity levels
DP4
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Stellar physics (DP5)
• Take DP3 and DP4• Ingest ancillary data:
– Basic stellar properties, ...– GAIA paralaxes
• Rotational / Activity age• Stellar age, mass, radius• Inclination / rotation• Differential rotation• Composition• Structure (convective core,…)
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DP5 implementation
• Input required from Stellar Science (M.-J.Goupil)• Grid of models• Criteria for agreement• Surface effects (what do we do?)• Different models...• Different oscillation codes• Product and quality assurance
PLATO KO - Paris - November 2010
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Power spectrum analysis
Stellar modelling
Rotation / activity
Quality / validation
Av. parameters
Fit parameters
Stellar grid models
Inversions
Spots distribution
Low freq. analysis
Activity levels
DP3
DP4
DP5
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Activities
• Definition:– Until June 2011, then December 2011 if selected
• Implementation:– From 2012 to end 2018
• Operations:– From 2019 to 2023
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Summary
• Close link with with Science WPs• Stellar Analysis System will implement codes for
fitting spectra; extracting activity / rotation; stellar mass, radius of the PLATO samples
• Code mainly dedicated to solar-like oscillations• Free to set up our own center for taking care of
the other stars (classical pulsators for instance)
PLATO KO - Paris - November 2010