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An optical and near-infrared search for brown dwarfs in the Pleiades cluster


Nagashima, C and Dobbie, PD and Nagayama, T and Nakajima, Y and Nagata, T and Tamura, M and Nakajima, T and Sugitani, K and Nakaya, H and Hodgkin, ST and Pickles, AJ and Sato, S, An optical and near-infrared search for brown dwarfs in the Pleiades cluster, Monthly Notices of the Royal Astronomical Society, 343, (4) pp. 1263-1270. ISSN 0035-8711 (2003) [Refereed Article]

Copyright Statement

Copyright 2003 RAS

DOI: doi:10.1046/j.1365-8711.2003.06766.x


We have carried out a brown dwarf search over an area of 14 × 23 arcmin2 near the central portion of the Pleiades open cluster in five optical and near-infrared bands (i', Z, J, H, Ks) with 10σ detection limits of i' ∼ 22.0, J ∼ 20.0 and Ks ∼ 18.5 mag. The surveyed area has large extinction in excess of AV= 3 in the Pleiades region. We detected four new brown dwarf candidates from the colour–colour (JK, i'J) and the colour–magnitude (J, i′ − K) diagrams. We estimated their masses as 0.046 M⊙ down to 0.028 M⊙. The least massive one is estimated to have a mass smaller than Roque25 or int-pl-IZ-69, and possibly the lowest-mass object found so far in the Pleiades cluster.

Item Details

Item Type:Refereed Article
Keywords:stars: low-mass, brown dwarfs; open clusters and associations: individual: Pleiades; infrared: stars
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Stellar astronomy and planetary systems
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Dobbie, PD (Dr Paul Dobbie)
ID Code:81172
Year Published:2003
Web of Science® Times Cited:12
Deposited By:Mathematics and Physics
Deposited On:2012-11-26
Last Modified:2013-06-26

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