Properties of extrasolar planets and their host stars - a case study of HAT-P-7

Abstract

Data from the Kepler satellite (Q0-Q11) are used to study HAT-P-7. The satellite's data are extremely valuable for asteroseismic studies of stars and for observing planetary transits; in this work we do both. An asteroseismic study of the host star improves the accuracy of the stellar parameters derived by Christensen-Dalsgaard et al. (2010), who followed largely the same procedure but based the analysis on only one month of Kepler data. The stellar information is combined with transit observations, phase variations and occultations to derive planetary parameters. In particular, we confirm the presence of ellipsoidal variations as discovered by Welsh et al. (2010), but revise their magnitude, and we revise the occultation depth (Borucki et al. 2009), which leads to different planetary temperature estimates. All other stellar and planetary parameters are now more accurately determined.

v2: calculational error fixed in log g value

References in corpus (4)

• ADIPLS -- the Aarhus adiabatic oscillation package
• Correcting stellar oscillation frequencies for near-surface effects
• ASTEC -- the Aarhus STellar Evolution Code
• HAT-P-7b: An Extremely Hot Massive Planet Transiting a Bright Star in the Kepler Field

Cited by in corpus (18)

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• Optical Phase Curves of Kepler Exoplanets
• 3.6 and 4.5 $\mu$m $Spitzer$ Phase Curves of the Highly-Irradiated Hot Jupiters WASP-19b and HAT-P-7b
• Determination of Three-dimensional Spin-orbit Angle with Joint Analysis of Asteroseismology, Transit Lightcurve, and the Rossiter-McLaughlin Effect: Cases of HAT-P-7 and Kepler-25
• Surface-effect corrections for solar-like oscillations using 3D hydrodynamical simulations
• The astrophysics of visible-light orbital phase curves in the space age
• Understanding the atmospheric properties and chemical composition of the ultra-hot Jupiter HAT-P-7b: I. Cloud and chemistry mapping
• Kepler's Optical Secondary Eclipse of HAT-P-7b and Probable Detection of Planet-Induced Stellar Gravity Darkening
• Friends of Hot Jupiters III: An Infrared Spectroscopic Search for Low-Mass Stellar Companions
• Asteroseismic inference on the spin-orbit misalignment and stellar parameters of HAT-P-7
• Cloud property trends in hot and ultra-hot giant gas planets (WASP-43b, WASP-103b, WASP-121b, HAT-P-7b, and WASP-18b)
• Asteroseismic modelling of solar-type stars: internal systematics from input physics and surface correction methods
• Exoplanet weather and climate regimes with clouds and thermal ionospheres: A model grid study in support of large-scale observational campaigns
• Robust Transiting Exoplanet Radii in the Presence of Starspots from Ingress and Egress Durations
• Inferring heat recirculation and albedo for exoplanetary atmospheres: Comparing optical phase curves and secondary eclipse data
• Inferring asymmetric limb cloudiness on exoplanets from transit light curves