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HD 75289Ab revisited - Searching for starlight reflected from a hot Jupiter | | F. Rodler
; M. Kuerster
; T. Henning
; | | Date: |
29 Apr 2008 | | 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. | | Source: | arXiv, 0804.4609 | | Services: | Forum | Review | PDF | Favorites | |
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