2015ApJ...805...28M


Query : 2015ApJ...805...28M

2015ApJ...805...28M - Astrophys. J., 805, 28 (2015/May-3)

Spin-orbit angles of Kepler-13Ab and HAT-P-7b from gravity-darkened transit light curves.

MASUDA K.

Abstract (from CDS):

Analysis of the transit light curve deformed by the stellar gravity darkening allows us to photometrically measure both components of the spin-orbit angle ψ, its sky projection λ and inclination of the stellar spin axis. In this paper, we apply the method to two transiting hot Jupiter systems monitored with the Kepler spacecraft, Kepler-13A and HAT-P-7. For Kepler-13A, we find and adopting the spectroscopic constraint λ = 58.°6±2.°0 by Johnson et al. In our solution, the discrepancy between the above λ and that previously reported by Barnes et al. is solved by fitting both of the parameters in the quadratic limb-darkening law. We also report the temporal variation in the orbital inclination of Kepler-13Ab,, providing further evidence for the spin-orbit precession in this system. By fitting the precession model to the time series of, λ, and obtained with the gravity-darkened model, we constrain the stellar quadrupole moment for our new solution, which is several times smaller than obtained for the previous one. We show that the difference can be observable in the future evolution of λ, thus providing a possibility to test our solution with follow-up observations. The second target, HAT-P-7, is the first F-dwarf star analyzed with the gravity-darkening method. Our analysis points to a nearly pole-on configuration with or and the gravity-darkening exponent β consistent with 0.25. Such an observational constraint on β can be useful for testing the theory of gravity darkening.

Abstract Copyright:

Journal keyword(s): planets and satellites: individual: (Kepler-13, KOI-13, KIC 9941, HAT-P-7, KOI-2, KIC 10666592) - stars: rotation - techniques: photometric

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 CVSO 30 TT* 05 25 07.5568292760 +01 34 24.357042408     16.26 15.88 13.70 M3 52 1
2 V* DI Her EB* 18 53 26.2399243224 +24 16 40.792648332   8.46 8.47     B5III 251 0
3 BD+46 2629 Er* 19 07 53.104944 +46 52 06.00420   10.12 9.70 9.80   A0 143 0
4 NAME BD+46 2629Ab Pl 19 07 53.1396671301 +46 52 05.931203366           ~ 136 1
5 BD+46 2629A * 19 07 53.1397066992 +46 52 05.922122844           ~ 36 1
6 BD+47 2846b Pl 19 28 59.3538131541 +47 58 10.216250846           ~ 328 1
7 BD+47 2846 Er* 19 28 59.3538826128 +47 58 10.217007804   10.97 10.48     F6V 281 2
8 * alf Aql dS* 19 50 46.99855 +08 52 05.9563 1.07 0.98 0.76 0.62 0.49 A7Vn 848 0

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2022.07.05-15:32:49

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