Upload
others
View
23
Download
0
Embed Size (px)
Citation preview
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
Stellar Model
Model Physics Uncertain● Convection● Rotation● Mixing● Diffusion● Atmosphere Boundary Condition● Helium● Solar composition● ...
Stellar Model Grid
Stellar Model Grid
Estimate Stellar Properties
TOI-1411.04 ± 0.03 Mo
TOI-1971.30 ± 0.09 Mo
TOI-141Espinoza+(2019)
TOI-197Huber+ (2019)
Impact of Model Choice: YREC
TOI-1411.04 ± 0.03 Mo
TOI-1971.30 ± 0.09 Mo
Grid:YREC
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)
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)
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
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
Take Away
When estimating stellar properties from models,
either inflate the error bars to account for model
systematics or compare to multiple models.
Stellar Model Grid
Sample light curve from Huber+ (2019)
Di Mauro+ (2011)
Asteroseismic Masses
Stellar Models
APOGEE-Kepler Subgiants
Serenelli+(2017) (inc Tayar)
APOGEE-Kepler Subgiants
Serenelli+(2017) (inc Tayar)
APOGEE-Kepler Subgiants
Models from Claytor+(2019)
APOGEE-Kepler Subgiants
Giants
APOGEE-Kepler Subgiants
GiantsGiantsOffset- Tayar+ 2017
APOGEE-Kepler Subgiants
Models do well for subgiants
APOGEE-Kepler Subgiants
Transition Unclear- Need More data
TESS
APOGEE-Kepler Subgiants
Transition Unclear- Need More data
TESS Subgiants
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
Expected Rotation
Expected Rotation
Rotation Difference
Rotation Difference
Giants too slow to measure
Rotation Difference
Scatter for hot stars
Rotation Difference
Subgiants spin faster than expected ?
Slide 1Slide 2Slide 3Slide 5Slide 6Slide 7Slide 8Slide 10Slide 12Slide 13Slide 14Slide 15Slide 16Slide 25Slide 26Slide 27Slide 28Slide 29Slide 30Slide 31Slide 32Slide 33Slide 34Slide 35Slide 36Slide 38Slide 39Slide 40Slide 41Slide 42Slide 43Slide 44