Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-10-27
Astronomy and Astrophysics
Astrophysics
6 pages, to be published in the proceedings book of Moriond_YLU 2004, edited by A. Chalabaev, Y. Fukui and T. Montmerle
Scientific paper
In this paper I show that the coolest $\sigma$Orionis cluster planet S Ori 70 is still a strong candidate member despite recent claims by Burgasser et al. that it could be a brown dwarf interloper. The main point of my argument is that the colors of S Ori 70 are significantly different to those of field dwarfs. This object has in fact the reddest $H-K$ color of all known T dwarfs, a clear indication of low gravity according to all published models. In a $J-H$ versus $H-K$ diagram, S Ori 70 lies in the region where models of ultracool dwarfs predict that low gravity objects should be located. I conclude that S Ori 70 is still a strong candidate member of the $\sigma$Orionis open cluster. I briefly discuss additional observational tests that can be carried out with existing facilities to verify the $\sigma$Orionis membership of this cluster planet candidate.
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