An Optical and Near Infrared Search for Brown Dwarfs in the Pleiades Cluster

Details An Optical and Near Infrared Search for Brown Dwarfs in the Pleiades Cluster An Optical and Near Infrared Search for Brown Dwarfs in the Pleiades Cluster

2003-05-10

arxiv.org/abs/astro-ph/0305173v1

Mon.Not.Roy.Astron.Soc. 343 (2003) 1263

Astronomy and Astrophysics

Astrophysics

9 pages, 7 figures, accepted for publication in MNRAS

Scientific paper

10.1046/j.1365-8711.2003.06766.x

We have carried out a brown dwarf search over an area of 14' x 23' near the central portion of the Pleiades open cluster in five optical and near infrared bands (i', Z, J, H, Ks) with 10 sigma 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 (J-K, i'-J) and the colour-magnitude (J, i'-K) diagrams. We estimated their masses as 0.046 Msun down to 0.028 Msun. The least massive one is estimated to have a mass smaller than Roque 25 or int-pl-IZ-69, and maybe the lowest mass object found so far in the Pleiades cluster.

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