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HD 209458 planetary transits from Hipparcos photometry *
N. Robichon and
Received 1 December 1999 / Accepted 7 December 1999
During its 39-month mission, Hipparcos observed the star HD 209458 on 89 occasions. Five of these observations are shown to correspond to epochs of planetary transits, with a % mean decrease of flux in the Hp band being observed during the transits. As a result of the long temporal baseline of more than 8 years between the Hipparcos and radial velocity measurements, an accurate orbital period of days can be derived from the Hipparcos photometric data.
Key words: stars: planetary systems stars: individual: HD 209458
Send offprint requests to: Noïl Robichon
Online publication: March 17, 2000