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

Abstract

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.

References in corpus (9)

• Spectral Energy Distributions of T Tauri Stars With Passive Circumstellar Disks
• The Formation of Brown Dwarfs as Ejected Stellar Embryos
• Spectral Energy Distributions of T Tauri and Herbig Ae Disks: Grain Mineralogy, Parameter Dependences, and Comparison with ISO LWS Observations
• Exploring Brown Dwarf Disks
• The Intermediate Age Brown Dwarf LP 944-20
• Silicate Emission in T Tauri Stars: Evidence for Disk Atmospheres?
• No disks around low-mass stars and brown dwarfs in the young sigma Orionis cluster?
• HST, VLT, and NTT imaging search for wide companions to bona-fide and candidate brown dwarfs in the Cha I dark cloud
• A Prediction of Brown Dwarfs in Ultracold Molecular Gas

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