Proper motion L and T dwarf candidate members of the Pleiades

Abstract

We present the results of a deep optical-near-infrared multi-epoch survey covering 2.5 square degrees of the Pleiades open star cluster to search for new very-low-mass brown dwarf members. A significant (~ 5 year) epoch difference exists between the optical (CFH12k I-, Z-band) and near infrared (UKIRT WFCAM J-band) observations. We construct I,I-Z and Z,Z-J 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 9 new candidate brown dwarf cluster members. The 7 faintest candidates have red Z-J colours and show blue near-infrared colours. These are consistent with being L and T-type Pleiads. Theoretical models predict their masses to be around 11 Jupiter masses. There is 1 errata for this paper

12 pages, 9 figures, 4 tables, accepted for publication in MNRAS Errata: 1 table

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• The Seven Sisters DANCe. I. Empirical isochrones, Luminosity and Mass Functions of the Pleiades cluster
• Contamination by field late-M, L and T dwarfs in deep surveys
• The lower mass function of the young open cluster Blanco 1: from 30 Mjup to 3 Mo
• Proper motions of field L and T dwarfs
• Diagnosing the Stellar Population and Tidal Structure of the Blanco1 Star Cluster
• The ages of L dwarfs
• Spectroscopic follow-up of L- and T-type proper-motion member candidates in the Pleiades
• Proper motions of field L and T dwarfs -II
• On the Binary Frequency of the Lowest Mass Members of the Pleiades with Hubble Space Telescope Wide Field Camera 3