TY - JOUR
T1 - A GRANULATION "FLICKER"-BASED MEASURE OF STELLAR SURFACE GRAVITY
AU - Bastien, Fabienne A.
AU - Stassun, Keivan G.
AU - Basri, Gibor
AU - Pepper, Joshua
N1 - Funding Information:
We thank Erik Petigura and Geoff Marcy for sharing their data with us in advance of publication, as well as Daniel Huber and Tom Barclay for helpful comments and discussions. We also thank the referee for helpful comments that improved the quality of the paper. Support for this work was provided in part by NASA through Hubble Fellowship grant #HST-HF2-51335 awarded by the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., for NASA, under contract NAS5-26555.
Publisher Copyright:
© 2016. The American Astronomical Society. All rights reserved.
PY - 2016/2/10
Y1 - 2016/2/10
N2 - In our previous work we found that high-quality light curves, such as those obtained by Kepler, may be used to measure stellar surface gravity via granulation-driven light curve "flicker" (F8). Here, we update and extend the relation originally presented by Bastien et al. in 2013 after calibrating F8 against a more robust set of asteroseismically derived surface gravities. We describe in detail how we extract the F8 signal from the light curves, including how we treat phenomena, such as exoplanet transits and shot noise, that adversely affect the measurement of F8. We examine the limitations of the technique, and, as a result, we now provide an updated treatment of the F8-based log g error. We briefly highlight further applications of the technique, such as astrodensity profiling or its use in other types of stars with convective outer layers. We discuss potential uses in current and upcoming space-based photometric missions. Finally, we supply F8-based log g values, and their uncertainties, for 27,628 Kepler stars not identified as hosts of transiting planets, with 4500 K < Teff < 7150 K, 2.5 < log g < 4.6, Kp ≤ 13.5, and overall photometric amplitudes <10 parts per thousand.
AB - In our previous work we found that high-quality light curves, such as those obtained by Kepler, may be used to measure stellar surface gravity via granulation-driven light curve "flicker" (F8). Here, we update and extend the relation originally presented by Bastien et al. in 2013 after calibrating F8 against a more robust set of asteroseismically derived surface gravities. We describe in detail how we extract the F8 signal from the light curves, including how we treat phenomena, such as exoplanet transits and shot noise, that adversely affect the measurement of F8. We examine the limitations of the technique, and, as a result, we now provide an updated treatment of the F8-based log g error. We briefly highlight further applications of the technique, such as astrodensity profiling or its use in other types of stars with convective outer layers. We discuss potential uses in current and upcoming space-based photometric missions. Finally, we supply F8-based log g values, and their uncertainties, for 27,628 Kepler stars not identified as hosts of transiting planets, with 4500 K < Teff < 7150 K, 2.5 < log g < 4.6, Kp ≤ 13.5, and overall photometric amplitudes <10 parts per thousand.
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U2 - 10.3847/0004-637X/818/1/43
DO - 10.3847/0004-637X/818/1/43
M3 - Article
AN - SCOPUS:84959156527
SN - 0004-637X
VL - 818
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
M1 - 43
ER -