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Preprint 03/03

OGLE-TR-3: A possible new transiting planet

Dreizler, S. (1), Hauschildt, P. H. (2), Kley, W. (3), Rauch, T. (1,4), Schuh, S. L. (1), Werner, K. (1), Wolff, B. (5)

(1) 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

A&A 402, 791 (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 MJup, R<1.6 RJup, and an orbital separation of about 5 Rsun, 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.
Based on observations collected at the European Southern Observatory, Paranal, Chile (ESO Programme 269.C-5034).
Key words: binaries: eclipsing - stars: individual: OGLE-TR-3 - stars: low-mass, brown dwarfs - stars: planetary systems

Preprint (437 kb PDF file including figures)
Astrophysics (astro-ph): 0303183

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