Free access
Issue
A&A
Volume 438, Number 2, August I 2005
Page(s) L25 - L28
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:200500116


A&A 438, L25-L28 (2005)
DOI: 10.1051/0004-6361:200500116

Letter

Giant planet companion to 2MASSW J1207334-393254

G. Chauvin1, A.-M. Lagrange2, C. Dumas1, B. Zuckerman3, D. Mouillet4, I. Song3, J.-L. Beuzit2 and P. Lowrance5

1  European Southern Observatory, Casilla 19001, Santiago 19, Chile
    e-mail: gchauvin@eso.org
2  Laboratoire d'Astrophysique, Observatoire de Grenoble, 414 rue de la piscine, Saint-Martin d'Hères, France
3  Department of Physics & Astronomy and Center for Astrobiology, University of California, Los Angeles, Box 951562, CA 90095-1562, USA
4  Laboratoire d'Astrophysique, Observatoire Midi-Pyrénées, Tarbes, France
5  Spitzer Science Center, Infrared Processing and Analysis Center, MS 220-6, Pasadena, CA 91125, USA

(Received 5 April 2005 / Accepted 28 April 2005)

Abstract
We report new VLT/NACO imaging observations of the young, nearby brown dwarf 2MASSW J1207334-393254 and its suggested planetary mass companion (2M1207 b). Three epochs of VLT/NACO measurements obtained over nearly one year show that the planetary mass companion candidate shares the same proper motion and, with a high confidence level, is not a stationary background object. This result confirms the status of 2M1207 b as of planetary mass (5 times the mass of Jupiter) and the first image of a planetary mass companion in a different system than our own. This discovery offers new perspectives for our understanding of chemical and physical properties of planetary mass objects as well as their mechanisms of formation.

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