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The CORALIE survey for southern extra-solar planets. X. A Hot Jupiter orbiting HD73256

S. Udry·M. Mayor·J. V. Clausen·L. M. Freyhammer·B. E. Helt·C. Lovis·D. Naef·E. H. Olsen·F. Pepe·D. Queloz·N. C. Santos
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Abstract

Recent radial-velocity measurements obtained with the CORALIE spectrograph on the 1.2-m Euler Swiss telescope at La Silla unveil the presence of a new Jovian-mass Hot Jupiter around HD 73256. The 1.85-M_Jup planet moves on an extremely short-period (P=2.5486 d), quasi-circular orbit. The best Keplerian orbital solution is presented together with an unsuccessful photometric planetary-transit search performed with the SAT Danish telescope at La Silla. Over the time span of the observations, the photometric follow-up of the candidate has nevertheless revealed a P=14-d photometric periodicity corresponding to the rotational period of the star. This variation as well as the radial-velocity jitter around the Keplerian solution are shown to be related to the fair activity level known for HD 73256.

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S. Udry, M. Mayor, J. V. Clausen, L. M. Freyhammer, B. E. Helt, C. Lovis, D. Naef, E. H. Olsen, F. Pepe, D. Queloz, N. C. Santos. 2003-06-03. The CORALIE survey for southern extra-solar planets. X. A Hot Jupiter orbiting HD73256. https://doi.org/10.1051/0004-6361%3A20030815

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