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The large-scale disk fraction of brown dwarfs in the Taurus cloud as measured with Spitzer

Monin, J.-L. and Guieu, S. and Pinte, C. and Rebull, L. and Goldsmith, P. and Fukagawa, M. and Ménard, F. and Padgett, D. and Stappelfeld, K. and McCabe, C. and Carey, S. and Noriega-Crespo, A. and Brooke, T. and Huard, T. and Terebey, S. and Hillenbrand, L. and Guedel, M. (2010) The large-scale disk fraction of brown dwarfs in the Taurus cloud as measured with Spitzer. Astronomy and Astrophysics, 515 . Art. No. A91. ISSN 0004-6361. doi:10.1051/0004-6361/200912338.

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Aims. The brown dwarf (BD) formation process has not yet been completely understood. To shed more light on the differences and similarities between star and BD formation processes, we study and compare the disk fraction among both kinds of objects over a large angular region in the Taurus cloud. In addition, we examine the spatial distribution of stars and BD relative to the underlying molecular gas. Methods. In this paper, we present new and updated photometry data from the Infrared Array Camera (IRAC) aboard the Spitzer Space Telescope on 43 BDs in the Taurus cloud, and recalculate of the BD disk fraction in this region. We also useed recently available CO mm data to study the spatial distribution of stars and BDs relative to the cloud's molecular gas. Results. We find that the disk fraction among BDs in the Taurus cloud is 41 ± 12%, a value statistically consistent with the one among TTS (58 ± 9%). We find that BDs in transition from a state where they have a disk to a diskless state are rare, and we study one isolated example of a transitional disk with an inner radius of ≈0.1 AU (CFHT BD Tau 12, found via its relatively small mid-IR excess compared to most members of Taurus that have disks. We find that BDs are statistically found in regions of similar molecular gas surface density to those associated with stars. Furthermore, we find that the gas column density distribution is almost identical for stellar and substellar objects with and without disks.

Item Type:Article
Related URLs:
URLURL TypeDescription
Pinte, C.0000-0001-5907-5179
Rebull, L.0000-0001-6381-515X
Goldsmith, P.0000-0002-6622-8396
Padgett, D.0000-0001-5334-5107
Stappelfeld, K.0000-0002-2805-7338
Carey, S.0000-0002-0221-6871
Noriega-Crespo, A.0000-0002-6296-8960
Additional Information:© 2010 EDP Sciences. Received: 16 April 2009; Accepted: 25 January 2010. We thank an anonymous referee for a very detailed and precise report that helped uncover several errors in the first version of this paper. This research has made use of the CDS database. We thank the Programme National de Physique Stellaire (PNPS, CNRS/INSU, France) for financial support. The authors also wish to extend special thanks to those of Hawaiian ancestry on whose sacred mountain of Mauna Kea we are privileged to be guests. Without their generous hospitality, the CFH Telescope observations presented therein would not have been possible.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Programme National de Physique Stellaire (PNPS)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Institut national des sciences de l'Univers (INSU)UNSPECIFIED
Subject Keywords:stars: formation; brown dwarfs; circumstellar matter; surveys; catalogs
Record Number:CaltechAUTHORS:20100818-103802947
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Official Citation:The large-scale disk fraction of brown dwarfs in the Taurus cloud as measured with Spitzer J.-L. Monin, S. Guieu, C. Pinte, L. Rebull, P. Goldsmith, M. Fukagawa, F. Ménard, D. Padgett, K. Stappelfeld, C. McCabe, S. Carey, A. Noriega-Crespo, T. Brooke, T. Huard, S. Terebey, L. Hillenbrand and M. Guedel A&A 515 A91 (2010) DOI: 10.1051/0004-6361/200912338
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:19493
Deposited On:20 Aug 2010 20:11
Last Modified:08 Nov 2021 23:52

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