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Issue A&A Volume 402, Number 2, May I 2003 Page(s) 791 - 799 Section The Sun DOI 10.1051/0004-6361:20030281

A&A 402, 791-799 (2003)
DOI: 10.1051/0004-6361:20030281

OGLE-TR-3: A possible new transiting planet

S. Dreizler¹, P. H. Hauschildt², W. Kley³, T. Rauch^{1, 4}, S. L. Schuh¹, K. Werner¹ and B. Wolff<sup>5

1</sup>  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

(Received 20 December 2002 / Accepted 19 February 2003)

Abstract
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 M<2.5 , R<1.6 , 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

Offprint request: S. Dreizler dreizler@astro.uni-tuebingen.de

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© ESO 2003

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