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Issue A&A
Volume 453, Number 1, July I 2006
Page(s) L1 - L4
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20065290



A&A 453, L1-L4 (2006)
DOI: 10.1051/0004-6361:20065290

Letter

The first brown dwarf with a disk in Chamaeleon II

J. M. Alcalá1, L. Spezzi2, A. Frasca3, E. Covino1, A. Porras4, B. Merín5 and P. Persi6

1  INAF - Osservatorio Astronomico di Capodimonte, via Moiariello 16, 80131 Napoli, Italy
    e-mail: jmae@na.astro.it
2  Dipartimento di Fisica e Astronomia, Università di Catania, via S. Sofia, 78, 95123 Catania, Italy
3  INAF - Osservatorio Astrofisico di Catania, via S. Sofia, 78, 95123 Catania, Italy
4  Center for Astrophysics, Harvard
5  Leiden Observatory, PO Box 9513, 2300 RA Leiden, The Netherlands
6  INAF - IASF Roma, via fosso del cavaliere, 100, 00133 Roma, Italy

(Received 27 March 2006 / Accepted 20 April 2006)

Abstract
In this letter we characterize the candidates for young stars and brown dwarfs detected in a survey with ISOCAM in the Chamaeleon II dark cloud. Photometric data coming from a wide-field optical imaging survey, combined with IR measurements from the 2MASS catalogue and from the Spitzer satellite, allow us to study the nature of the candidates. Using intermediate-band filters we can provide a first estimate of the temperatures for objects cooler than about 3800 K. On the basis of spectroscopic and photometric data, we confirm that ISO-CHA II 13 is a young substellar object with a mass of about $0.05~M_{\odot}$. It is thus the first object in Cha II whose substellar nature has been spectroscopically confirmed. By having a temperature of about 2880 K and displaying a substantial infrared excess, it joins the list of young brown dwarfs observed to have a surrounding disk.


Key words: stars: low-mass, brown dwarfs -- stars: formation -- stars: pre-main sequence -- stars: individual objects: ISO-CHA II 13



© ESO 2006


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