SOPHIE velocimetry of Kepler transit candidates IV. KOI-196b: a non-inflated hot-Jupiter with a high albedo

Abstract

We report the discovery of a new hot-Jupiter, KOI-196b, transiting a solar-type star with an orbital period of 1.855558 days\pm0.6s thanks to public photometric data from the Kepler space mission and new radial velocity observations obtained by the SOPHIE spectrograph mounted on the 1.93-m telescope at the Observatoire de Haute-Provence, France. The planet KOI-196b, with a radius of 0.841\pm0.032 Rjup and a mass of 0.49\pm0.09 Mjup, orbits a G2V star with R* = 0.996\pm0.032 Rsun, M*= 0.94\pm0.09 Msun, [Fe/H] = -0.10\pm0.16 dex, Teff= 5660\pm100 K and an age of 7.7\pm3.4 Gy. KOI-196b is one the rare close-in hot-Jupiters with a radius smaller than Jupiter suggesting a non-inflated planet. The high precision of the Kepler photometry permits us to detect the secondary transit with a depth of 64 +10/-12 ppm as well as the optical phase variation. We find a geometric albedo of Ag = 0.30\pm0.08 which is higher than most of the transiting hot-Jupiters with a measured Ag. Assuming no heat recirculation, we find a day-side temperature of Tday = 1930\pm80 K. KOI-196b seems to be one of the rare hot-Jupiters located in the short-period hot-Jupiter desert.

9 pages, 10 figures, accepted in A&A

References in corpus (10)

• KEPLER's First Rocky Planet: Kepler-10b
• Modeling Kepler transit light curves as false positives: Rejection of blend scenarios for Kepler-9, and validation of Kepler-9d, a super-Earth-size planet in a multiple system
• HAT-P-7b: An Extremely Hot Massive Planet Transiting a Bright Star in the Kepler Field
• Long-term tidal evolution of short-period planets with companions
• A spectroscopic study of southern (candidate) gamma Doradus stars. II. Detailed abundance analysis and fundamental parameters
• Thermal Emission from Transiting Very-Hot Jupiters: Prospects for Ground-based Detection at Optical Wavelengths
• SOPHIE velocimetry of Kepler transit candidates III. KOI-423b: an 18 Mjup transiting companion around an F7IV star
• Theoretical Radii of Extrasolar Giant Planets: the Cases of TrES-4, XO-3b, and HAT-P-1b
• SOPHIE velocimetry of Kepler transit candidates II. KOI-428b: a hot Jupiter transiting a subgiant F-star
• The formation of HD 149026 b

Cited by in corpus (38)

• Revised Stellar Properties of Kepler Targets for the Quarter 1-16 Transit Detection Run
• The Mass of KOI-94d and a Relation for Planet Radius, Mass, and Incident Flux
• Revised Stellar Properties of Kepler Targets for the Q1-17 (DR25) Transit Detection Run
• SOPHIE velocimetry of Kepler transit candidates XVII. The physical properties of giant exoplanets within 400 days of period
• Transit Timing Observations from Kepler: IV. Confirmation of 4 Multiple Planet Systems by Simple Physical Models
• Changing Phases of Alien Worlds: Probing Atmospheres of Kepler Planets with High-Precision Photometry
• Kepler-413b: a slightly misaligned, Neptune-size transiting circumbinary planet
• SOPHIE velocimetry of Kepler transit candidates VII. A false-positive rate of 35% for Kepler close-in giant exoplanet candidates
• Homogeneous studies of transiting extrasolar planets. V. New results for 38 planets
• Understanding Trends Associated with Clouds in Irradiated Exoplanets
• GTC OSIRIS transiting exoplanet atmospheric survey: detection of sodium in XO-2b from differential long-slit spectroscopy
• Studying atmosphere-dominated hot Jupiter Kepler phase curves: Evidence that inhomogeneous atmospheric reflection is common
• SOPHIE velocimetry of Kepler transit candidates XII. KOI-1257 b: a highly eccentric three-month period transiting exoplanet
• ExoClock Project III: 450 new exoplanet ephemerides from ground and space observations
• Investigating hot-Jupiter inflated radii with hierarchical Bayesian modelling
• Kepler KOI-13.01 - Detection of beaming and ellipsoidal modulations pointing to a massive hot Jupiter
• A Uniform Search for Secondary Eclipses of Hot Jupiters in Kepler Q2 Lightcurves
• The contribution of secondary eclipses as astrophysical false positives to exoplanet transit surveys
• Confirmation of Hot Jupiter Kepler-41b via Phase Curve Analysis
• SOPHIE velocimetry of Kepler transit candidates. V. The three hot Jupiters KOI-135b, KOI-204b and KOI-203b (alias Kepler-17b)
• Improved parameters of seven Kepler giant companions characterized with SOPHIE and HARPS-N
• Probing exoplanet clouds with optical phase curves
• SOPHIE velocimetry of Kepler transit candidates XI. Kepler-412 system: probing the properties of a new inflated hot Jupiter
• KOI-200b and KOI-889b: two transiting exoplanets detected and characterized with Kepler, SOPHIE and HARPS-N
• Spectroscopic and seismic analysis of red giants in eclipsing binaries discovered by Kepler
• New transiting hot Jupiters discovered by WASP-South, Euler/CORALIE and TRAPPIST-South
• The GAPS Programme at TNG LV. Multiple molecular species in the atmosphere of HAT-P-11 b and review of the HAT-P-11 planetary system
• Searching for reflected light from $\tau$ Bootis b with high-resolution ground-based spectroscopy: Approaching the $10^{-5}$ contrast barrier
• On a Possible Solution to the Tidal Realignment Problem for Hot Jupiters
• Characterization of the four new transiting planets KOI-188b, KOI-195b, KOI-192b, and KOI-830b
• Average Albedos of Close-in Super-Earths and Neptunes from Statistical Analysis of Long Cadence Kepler Secondary Eclipse Data
• Characterization of Exoplanets: Secondary Eclipses
• Kepler's Dark Worlds: a Low Albedo for an Ensemble of Neptunian and Terran Exoplanets
• The SOPHIE search for northern extrasolar planets-XIX. A system including a cold sub-Neptune potentially transiting a V = 6.5 star HD88986
• Solar Contamination in Extreme Precision Radial Velocity Measurements: Deleterious Effects and Prospects for Mitigation
• KIC 7955301: a hierarchical triple system with eclipse timing variations and an oscillating red giant
• Atmospheric Characterization via Broadband Color Filters on the PLAnetary Transits and Oscillations of stars (PLATO) Mission
• Observations of scattered light from exoplanet atmospheres