Volume 402, Number 2, May I 2003
|Page(s)||791 - 799|
|Section||Planets and planetary systems|
|Published online||14 April 2003|
Institut für Astronomie und Astrophysik, Abt. Astronomie, Sand 1, 72076 Tübingen, Germany
2 Hamburger Sternwarte, Gojenbergsweg 112, 21029 Hamburg, Germany
3 Institut für Astronomie und Astrophysik, Abt. Computational Physics, Auf der Morgenstelle 10, 72076 Tübingen, Germany
4 Dr.-Remeis-Sternwarte, Sternwartstraße 7, 96049 Bamberg, Germany
5 European Southern Observatory, Karl-Schwarzschild-Straße 2, 85748 Garching, Germany
Corresponding author: S. Dreizler firstname.lastname@example.org
Accepted: 19 February 2003
Recently, 59 low-luminosity object transits were reported from the Optical Gravitational Lensing Experiment (OGLE). Our follow-up low-resolution spectroscopy of 16 candidates provided two objects, OGLE-TR-3 and OGLE-TR-10, which have companions with radii compatible with those of gas-giant planets. Further high-resolution spectroscopy revealed a very low velocity variation (< 500 m s-1) of the host star OGLE-TR-3 which may be caused by its unseen companion. An analysis of the radial velocity and light curve results in , , and an orbital separation of about 5 , which makes it the planet with the shortest period known. This allows to identify the low-luminosity companion of OGLE-TR-3 as a possible new gas-giant planet. If confirmed, this makes OGLE-TR-3 together with OGLE-TR-56 the first extrasolar planets detected via their transit light curves.
Key words: binaries: eclipsing / stars: individual: OGLE-TR-3 / stars: low-mass, brown dwarfs / stars: planetary systems
© ESO, 2003
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