A search for starlight reflected from HD 75289b |
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Authors: | Christopher Leigh rew Collier Cameron Stephane Udry Jean-François Donati Keith Horne David James Alan Penny |
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Institution: | School of Physics &Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9SS;Observatoire de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland;Laboratoire d'Astrophysique Observatoire Midi-Pyrénées, 14 avenue Edouard Belin, F-31400 Toulouse, France;Observatoire de Grenoble, F-38041 Grenoble, Cedex 9, France;Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX |
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Abstract: | We have used a Doppler tomographic analysis to conduct a deep search for the starlight reflected from the planetary companion to HD 75289. In four nights on VLT(UT2)/UVES in 2003 January, we obtained 684 high-resolution echelle spectra with a total integration time of 26 h. We establish an upper limit on the geometric albedo of the planet p < 0.12 (to the 99.9 per cent significance level) at the most probable orbital inclination i ? 60° , assuming a grey albedo, a Venus-like phase function and a planetary radius R p= 1.6 RJup . We are able to rule out some combinations of the predicted planetary radius and atmospheric albedo models with high, reflective cloud decks. |
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Keywords: | techniques: spectroscopic stars: individual: HD 75289 planetary systems |
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