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

journal contribution
posted on 2023-05-17, 14:41 authored by Nagashima, C, Dobbie, PD, Nagayama, T, Nakajima, Y, Nagata, T, Tamura, M, Nakajima, T, Sugitani, K, Nakaya, H, Hodgkin, ST, Pickles, AJ, Sato, S
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.

History

Publication title

Monthly Notices of the Royal Astronomical Society

Volume

343

Issue

4

Pagination

1263-1270

ISSN

0035-8711

Department/School

School of Natural Sciences

Publisher

Blackwell Publishing Ltd

Place of publication

9600 Garsington Rd, Oxford, England, Oxon, Ox4 2Dg

Rights statement

Copyright 2003 RAS

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the physical sciences

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