calibrating stellar models in the tess era tayar.pdfjamie tayar with zach claytor and the...
TRANSCRIPT
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Calibrating Stellar Models in the TESS Era
Jamie TayarWith Zach Claytor and the
APOGEE-Kepler, APOGEE-TESS, & TESS Subgiant Collaborations
TESS Science ConferenceJuly 30, 2019
Hubble Fellow@StellarTayar
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Stellar Model
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Model Physics Uncertain● Convection● Rotation● Mixing● Diffusion● Atmosphere Boundary Condition● Helium● Solar composition● ...
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Stellar Model Grid
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Stellar Model Grid
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Estimate Stellar Properties
TOI-1411.04 ± 0.03 Mo
TOI-1971.30 ± 0.09 Mo
TOI-141Espinoza+(2019)
TOI-197Huber+ (2019)
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Impact of Model Choice: YREC
TOI-1411.04 ± 0.03 Mo
TOI-1971.30 ± 0.09 Mo
Grid:YREC
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Impact of Model Choice: MIST
TOI-1411.05 ± 0.03 Mo1.04 ± 0.03 Mo
TOI-1971.31 ± 0.06 Mo1.30 ± 0.09 MoGrid:
YRECMIST
MIST: Choi+(2016)
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Impact of Model Choice: Dartmouth
TOI-1411.07 ± 0.02 Mo1.05 ± 0.03 Mo1.04 ± 0.03 Mo
TOI-1971.33 ± 0.07 Mo1.31 ± 0.06 Mo1.30 ± 0.09 Mo
Grid:YRECMISTDartmouth
Dartmouth: Dotter+(2008)
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Model Choice Matters
TOI-1411.07 ± 0.02 Mo1.05 ± 0.03 Mo1.04 ± 0.03 Mo
TOI-1971.33 ± 0.07 Mo1.31 ± 0.06 Mo1.30 ± 0.09 Mo
Grid:YRECMISTDartmouth
Offsets of ~4% in inferred mass depending on model grid used
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Model Choice Matters
TOI-1411.07 ± 0.02 Mo1.05 ± 0.03 Mo1.04 ± 0.03 Mo
TOI-1971.33 ± 0.07 Mo1.31 ± 0.06 Mo1.30 ± 0.09 Mo
Grid:YRECMISTDartmouth
Offsets of ~4% in inferred mass depending on model grid used No strong metallicity
dependence
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Take Away
When estimating stellar properties from models,
either inflate the error bars to account for model
systematics or compare to multiple models.
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Stellar Model Grid
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Sample light curve from Huber+ (2019)
Di Mauro+ (2011)
Asteroseismic Masses
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Stellar Models
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APOGEE-Kepler Subgiants
Serenelli+(2017) (inc Tayar)
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APOGEE-Kepler Subgiants
Serenelli+(2017) (inc Tayar)
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APOGEE-Kepler Subgiants
Models from Claytor+(2019)
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APOGEE-Kepler Subgiants
Giants
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APOGEE-Kepler Subgiants
GiantsGiantsOffset- Tayar+ 2017
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APOGEE-Kepler Subgiants
Models do well for subgiants
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APOGEE-Kepler Subgiants
Transition Unclear- Need More data
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TESS
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APOGEE-Kepler Subgiants
Transition Unclear- Need More data
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TESS Subgiants
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Summary
● Stellar models need calibration● Model choice impacts inferred mass by ~4%● Predicted HR diagram position ~ correct● Kepler stars are a good but insufficient sample
for testing models of subgiants● TESS will allow us to add up to 300 more
similarly well characterized subgiants
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Expected Rotation
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Expected Rotation
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Rotation Difference
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Rotation Difference
Giants too slow to measure
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Rotation Difference
Scatter for hot stars
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Rotation Difference
Subgiants spin faster than expected ?
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