HD 75289Ab revisited - Searching for starlight reflected from a hot Jupiter

Abstract

Aims. We attempt to detect starlight reflected from a hot Jupiter, orbiting the main-sequence star HD 75289Ab. We report a revised analysis of observations of this planetary system presented previously by another research group. Methods. We analyse high-precision, high-resolution spectra, collected over four nights using UVES at the VLT/UT2, by way of data synthesis. We try to interpret our data using different atmospheric models for hot Jupiters. Results. We do not find any evidence for reflected light, and, therefore, establish revised upper limits to the planet-to-star flux ratio at the 99.9% significance level. At high orbital inclinations, where the best sensitivity is attained, we can limit the relative reflected radiation to be less than e = 6.7 x 10-5 assuming a grey albedo, and e = 8.3 x 10-5 assuming an Class IV function, respectively. This implies a geometric albedo smaller than p = 0.46 and p = 0.57, for the grey albedo and the Class IV albedo shape, respectively, assuming a planetary radius of 1.2 RJup.

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References in corpus (11)

• Catalog of Nearby Exoplanets
• Possible Solutions to the Radius Anomalies of Transiting Giant Planets
• Albedo and Reflection Spectra of Extrasolar Giant Planets
• Theoretical Spectra and Atmospheres of Extrasolar Giant Planets
• HAT-P-1b: A Large-Radius, Low-Density Exoplanet Transiting one Member of a Stellar Binary
• An Upper Limit on the Reflected Light from the Planet Orbiting the Star tau Bootis
• Extrasolar Giant Planets under Strong Stellar Irradiation
• A new upper limit on the reflected starlight from Tau Bootis b
• A low-mass stellar companion of the planet host star HD75289
• Near infrared spectroscopic search for the close orbiting planet HD 75289b
• Prospects for Spectroscopic Reflected-light Planet Searches

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