current performance of seismic diagnostics and stellar ... · internal physics and dynamics of...
TRANSCRIPT
![Page 1: Current performance of seismic diagnostics and stellar ... · Internal physics and dynamics of stars (e.g., depth of convective envelopes, presence/extent of convective cores, stellar](https://reader030.vdocuments.us/reader030/viewer/2022040801/5e3a50e322d6e23cb867a3f5/html5/thumbnails/1.jpg)
Margarida CunhaInstituto de Astrofísica e Ciências do Espaço, Universidade do Porto
PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
Current performance of seismic diagnostics and stellar
parameter determination
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Fundamental properties of stars (from asteroseismology)
PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
� Mass, Radius, Age (mean density, surface gravity)
=> planet properties and age of exoplanetary system
� Stellar inclination
=> Stellar obliquity
� Internal physics and dynamics of stars(e.g., depth of convective envelopes, presence/extent of convective cores,stellar rotation, etc)
=> Improve stellar models
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Fundamental properties of stars (from asteroseismology)
PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
� Mass, Radius, Age (mean density, surface gravity)
=> planet properties and age of exoplanetary system
� Stellar inclination
=> Stellar obliquity
� Internal physics and dynamics of stars(e.g., depth of convective envelopes, presence/extent of convective cores,stellar rotation, etc)
=> Improve stellar models
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Seismic Observables
PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
� Frequency of maximum power: νmax
� Large separation: Δν
VIRGO/SPM data
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Seismic Observables
PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
� Frequency of maximum power: νmax
� Large separation: Δν
��
Qmax v gTeff�1/ 2
��
'Qnl v U 1/ 2
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Seismic Observables
PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
� Frequency of maximum power: νmax
� Large separation: Δν
� Individual frequencies��
Qmax v gTeff�1/ 2
��
'Qnl v U 1/ 2
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Seismic Observables
PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
� Frequency of maximum power: νmax
� Large separation: Δν
� Individual frequencies��
Qmax v gTeff�1/ 2
��
'Qnl v U 1/ 2
![Page 8: Current performance of seismic diagnostics and stellar ... · Internal physics and dynamics of stars (e.g., depth of convective envelopes, presence/extent of convective cores, stellar](https://reader030.vdocuments.us/reader030/viewer/2022040801/5e3a50e322d6e23cb867a3f5/html5/thumbnails/8.jpg)
Seismic Observables
PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
� Frequency of maximum power: νmax
� Large separation: Δν
� Individual frequencies
� Frequency ratios / separations ; phases
��
Qmax v gTeff�1/ 2
��
'Qnl v U 1/ 2
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Non-seismic Observables
PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
� + TeffFor precise radius and surface gravity determination
� + MetallicityTo better constrain stellar masses and ages
� Luminosity, interferometric radius, etc (when available)
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Procedures for inference of stellar properties
PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
� Scaling relations
� Forward Modelling
� Signatures of rapid structural variations
� Seismic Inversions
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Procedures for inference of stellar properties
PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
� Scaling relations
� Forward Modelling
� Signatures of rapid structural variations
� Seismic Inversions
![Page 12: Current performance of seismic diagnostics and stellar ... · Internal physics and dynamics of stars (e.g., depth of convective envelopes, presence/extent of convective cores, stellar](https://reader030.vdocuments.us/reader030/viewer/2022040801/5e3a50e322d6e23cb867a3f5/html5/thumbnails/12.jpg)
Procedures for parameter inference
PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
� Direct use of scaling relations
��
Qmax v gTeff�1/ 2
��
'Qnl v U 1/ 2
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Procedures for parameter inference
PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
� Direct use of scaling relations
¾ Provide R and M only¾ Uncertainties are larger than the requirements for PLATO
(~5% in radius and ~10% in mass for dwarfs)
��
Qmax v gTeff�1/ 2
��
'Qnl v U 1/ 2
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PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
� Forward Modelling
Procedures for parameter inference
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PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
� Forward Modelling
¾ Fit a set of observables:
with uncertainties σi
¾With theoretical observables produced from models with parameters
Procedures for parameter inference
��
{yi} Teff ,[Fe/H],(L),seismic^ `
��
{aj} M,Y0,(Z0),(DMLT ),(ov), age, etc^ `
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PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
� Different approaches to forward modelling
¾ ≠ physics (evolutionary codes ; micro/macrophysics)
¾ ≠ combinations of observables(individual frequencies; ratios; phases; global seismic)
¾ ≠ model parameter space and ways to explore it(grid / models on demand)
¾ ≠ methods to find best model (optimisation)
Procedures for parameter inference
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Results on simulated data
PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
� Exercise 1: From Reese et al. 2016
5735 K < Teff < 6586 K
0.73 < L/L~ < 4.36
0.78 < M/M~ < 1.33
Reese+ 2016
¾ {yi}={Teff,[Fe/H],(L/L~),seismic}¾ 1 yr obs per star¾ 8 different pipelines
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Results on simulated data
PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
� Exercise 1: From Reese et al. 2016
Aardvarkεrel = 1.47 %brel = -0.99 %
Elvisεrel = 0.88 %brel = -0.49 %
¾ Average error and biases
Reese+ 2016
Adapted from Reese+ 2016
Different Pipelines
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Results on simulated data
PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
� Exercise 1: From Reese et al. 2016
Aardvarkεrel = 3.88 %brel = -2.51 %
Elvisεrel = 2.43 %brel = -1.32 %
¾ Average error and biases
Reese+ 2016
Adapted from Reese+ 2016
Different Pipelines
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Results on simulated data
PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
� Exercise 1: From Reese et al. 2016
Aardvarkεrel = 6.81 %brel = -5.66 %
Elvisεrel = 9.35 %brel = -8.16 %
¾ Average error and biases
Reese+ 2016
Adapted from Reese+ 2016
Different Pipelines
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Results on simulated data
� Exercise 1: From Reese et al. 2016
Felix George JamR 2.93 % 1.23 % 1.63 %
-1.08 % 0.87 % 1.00 %M 6.16 % 3.74 % 4.71 %
-3.27 % 2.08 % 3.37 % Age 40.18 % 33.93 % 33.32 %
20.18 % -6.72 % -23.15 %
εrelbrelεrelbrelεrelbrel
¾ Average error and biasesReese+ 2016
PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
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Results on simulated data
PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
PLATO “reference” star:M=1.12 M~
R=1.20 R~Age=3.44 Gyr
¾ Simulations were performed for V=9, V=10, and V=10.5, 2 yr observations, accounting for the PLATO Noise levels.
� Exercise 2: From W120 (PLATO-LESLIA-PSPM-TS-01)
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Results on simulated data
PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
� Exercise 2: From W120 (PLATO-LESLIA-PSPM-TS-01)
¾ {yi}={Teff,[Fe/H],(L/L~),seismic}
¾ 2 different pipelinesFor V= 9; 10; 10.5
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Results on simulated data
� Exercise 2: Campante et al.
Sample: 100 planet-host stars ; ~50% are evolved starsExpected Δν and νmax from TESS mission
Campante+ (priv com.)
PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
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Results on simulated data
� Exercise 2: Campante et al. Set 1: {yi}={Teff, [m/H], L}Set 2: {yi}={Teff, [m/H], L, Δν, νmax}
Campante+ (priv com.)
Radius Mass Age
Gravity Density
PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
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Results on simulated data
� Exercise 2: Campante et al.
Campante+ (priv com.)
PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
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PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
Results from real data
� Study 1: Chaplin et al. 2014
¾ {yi}={Teff, [Fe/H], Δν, (νmax)}¾ 1 month obs per star¾ 6 different pipelines
Set 1: ~500 stars Teff from photometry[Fe/H]=-0.2±0.3 dex
Set 2: 87 starsTeff and [Fe/H] from spect.
Chaplin+ 2014
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PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
Results from real data
� Study 1: Chaplin et al. 2014
Set 1 : The worst case scenario
Median uncertainties(formal plus grid scatter)
Radius: 4.4%Mass: 10.8%
Age: 34%
Chaplin+ 2014
Fractional uncertainty
Frac
tion
of ta
rget
s
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PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
Results from real data
� Study 1: Chaplin et al. 2014
Set 2: The impact of spectroscopy
Median uncertainties(formal plus grid scatter)
Radius: 2.2%Mass: 5.4%
Age: 25%
(σ < 30% for 80% stars !)
Chaplin+ 2014
Frac
tion
of ta
rget
s
Fractional uncertainty
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PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
Results from real data
� Study 2: Silva Aguirre et al. 2017
¾ {yi}={Teff, [Fe/H], seismic}¾ At least 1 yr obs per star¾ 7 different pipelines Kepler Legacy Sample
Silva Aguirre+ 2017
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PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
Results from real data
� Study 2: Silva Aguirre et al. 2017
Range of median uncertaintiesRadius: 1.3%-4.2%Mass: 2.3%-4.5%Age: 6.7%-20%
Diffe
rent
Pi
pelin
es
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PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
Results from real data
� Study 2: Silva Aguirre et al. 2017
Average uncertaintiesRadius: ~ 2%Mass: ~ 4%Age: ~ 10%
Diffe
rent
Pi
pelin
es
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Benchmark stars
PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
� Parameters from forward modelling are model-dependent
� Independent accurate determinations of the stellar parameters enables us to identify biases
Possible Benchmark stars¾ Stars in reach of interferometry (for radii)
¾ Stars in particular binary systems
Eclipsing +SB2 binaries (for radii and masses)
SB2 + Astrometric or visual/interferometric (for masses)
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PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
Benchmark stars
� Comparison with interferometric radius
Different Pipelines
Adapted from Silva Aguirre+ (2017) White+, in prep
Interferometric radius (R~)
Inte
rfero
met
ricra
dius
/Sei
smic
radi
us
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Conclusions
PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017
� Asteroseismic data, in particular oscillation frequencies =>M, R, and Age determined with higher precision.
� Precise Mass and Age determinations require knowledge of stellar metallicity.
� For a star not too different from the sun, and magnitude V≈8-10, Radius, Mass, and Age can be determined to precision better than ≈ 2%, 5%, and 10%, respectively.
� Forward modelling of large samples of Kepler targets provides average uncertainties of similar magnitude when individual frequencies are available.
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Thank you for your attention
Obrigada!
PLATO Mission Conference 2017:Exoplanetary systems in the PLATO era
Warwick 5-7 September 2017