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Title:
Field brown dwarfs found by DENIS
Authors:
Delfosse, X.; Tinney, C. G.; Forveille, T.; Epchtein, N.; Bertin, E.; Borsenberger, J.; Copet, E.; de Batz, B.; Fouque, P.; Kimeswenger, S.; Le Bertre, T.; Lacombe, F.; Rouan, D.; Tiphene, D.
Affiliation:
AA(Observatoire de Grenoble, 414 rue de la Piscine, Domaine Universitaire de S() t Martin d'Heres, F-38041 Grenoble, France), AB(Anglo-Australian Observatory, PO Box 296, Epping. NSW 2121. Australia), AC(Observatoire de Grenoble, 414 rue de la Piscine, Domaine Universitaire de S() t Martin d'Heres, F-38041 Grenoble, France), AD(Observatoire de Paris, 5, Place Jules Janssen, F-92195 Meudon Cedex, France), AE(Institut d'Astrophysique de Paris, 98bis, Bd Arago, F-75014 Paris, France; Sterrewacht Leiden, University of Leiden, Niels Bohrweg 2, 2333 CA Leiden, The Netherlands; European Southern Observatory, Casilla 19001, Santiago 19, Chile), AF(Institut d'Astrophysique de Paris, 98bis, Bd Arago, F-75014 Paris, France), AG(Observatoire de Paris, 5, Place Jules Janssen, F-92195 Meudon Cedex, France), AH(Observatoire de Paris, 5, Place Jules Janssen, F-92195 Meudon Cedex, France), AI(Observatoire de Paris, 5, Place Jules Janssen, F-92195 Meudon Cedex, France; European Southern Observatory, Casilla 19001, Santiago 19, Chile), AJ(Institut fur Astronomie der Universitat Innsbruck, Technikerstr. 25, A-6020 Innsbruck, Austria), AK(Observatoire de Paris, 5, Place Jules Janssen, F-92195 Meudon Cedex, France), AL(Observatoire de Paris, 5, Place Jules Janssen, F-92195 Meudon Cedex, France), AM(Observatoire de Paris, 5, Place Jules Janssen, F-92195 Meudon Cedex, France), AN(Observatoire de Paris, 5, Place Jules Janssen, F-92195 Meudon Cedex, France)
Publication:
Astronomy and Astrophysics, v.327, p.L25-L28 (1997) (A&A Homepage)
Publication Date:
11/1997
Origin:
A&A
A&A Keywords:
STARS: LATE-TYPE, LOW-MASS, BROWN DWARFS
Bibliographic Code:
1997A&A...327L..25D

Abstract

We present three candidate field brown dwarfs, identified by the DENIS survey. This on-going three colour survey of the southern sky has, as of July 1997, covered over 30% of the southern hemisphere in the I, J and Kshort passbands. The enormous sampled volume makes DENIS ideal for detecting brown dwarfs. The present results are based on preliminary processing of about 230 square degrees of DENIS data -- a small fraction of the existing sky coverage. This reveals a sizeable population of very cold dwarfs, three of which are at least as cool as GD 165B. Infrared spectra confirm their dwarf status, and provide effective temperature information: one object (DENIS-P J1058.7-1548) is comparable in temperature to GD 165B and a second (DENIS-P J1228.2-1547) is slightly cooler, while a third (DENIS-P J0205.4-1159) is significantly so -- though not as cold as Gl 229B. The infrared spectrum of DENIS-P J0205.4-1159 shows evidence for a methane absorption band, which implies an effective temperature much below the stellar limit. Lastly, recent detections of lithium in DENIS-P J1228.2-1547 have proven it to have a substellar mass. This makes it (together with the recently discovered object Kelu-1) the first bona-fide isolated field brown dwarf. Partly based on observations obtained at the European Southern Observatory

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