Probing Dust around Brown Dwarfs: The naked LP 944-20 and the Disk of Cha Ha2

Details Probing Dust around Brown Dwarfs: The naked LP 944-20 and the Disk of Cha Ha2 Probing Dust around Brown Dwarfs: The naked LP 944-20 and the Disk of Cha Ha2

2002-06-13

arxiv.org/abs/astro-ph/0206210v1

Astronomy and Astrophysics

Astrophysics

Scientific paper

10.1086/342210

We present the first mid-infrared (MIR) detection of a field brown dwarf (BD) and the first ground-based MIR measurements of a disk around a young BD candidate. We prove the absence of warm dust surrounding the field BD LP 944-20. In the case of the young BD candidate Cha Ha2, we find clear evidence for thermal dust emission from a disk. Surprisingly, the object does not exhibit any silicate feature as previously predicted. We show that the flat spectrum can be explained by an optically thick flat dust disk.

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