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Proper motion L and T dwarf candidate members of the Pleiades

Citation

Casewell, SL and Dobbie, PD and Hodgkin, ST and Moraux, E and Jameson, RF and Hambly, NC and Irwin, J and Lodieu, N, Proper motion L and T dwarf candidate members of the Pleiades, Monthly Notices of the Royal Astronomical Society, 378, (3) pp. 1131-1140. ISSN 0035-8711 (2007) [Refereed Article]

Copyright Statement

Copyright 2007 RAS

DOI: doi:10.1111/j.1365-2966.2007.11848.x

Abstract

We present the results of a deep optical–near-infrared (optical–NIR) multi-epoch survey covering 2.5 deg2 of the Pleiades open star cluster to search for new very low-mass brown dwarf members. A significant (∼5 yr) epoch difference exists between the optical (CFH12k I-, Z-band) and NIR (UKIRT WFCAM J-band) observations. We construct I, IZ and Z, ZJ colour–magnitude diagrams to select candidate cluster members. Proper motions are computed for all candidate members and compared to the background field objects to further refine the sample. We recover all known cluster members within the area of our survey. In addition, we have discovered nine new candidate brown dwarf cluster members. The seven faintest candidates have red ZJ colours and show blue NIR colours. These are consistent with being L- and T-type Pleiads. Theoretical models predict their masses to be around 11MJup.

Item Details

Item Type:Refereed Article
Keywords:low-mass stars, brown dwarfs, open clusters and associations, Pleiades
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Stellar Astronomy and Planetary Systems
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Dobbie, PD (Dr Paul Dobbie)
ID Code:81084
Year Published:2007
Web of Science® Times Cited:40
Deposited By:Mathematics and Physics
Deposited On:2012-11-22
Last Modified:2013-06-25
Downloads:0

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