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Probing Dust around Brown Dwarfs: The Naked LP 944–20 and the Disk of Cha Hα2

Published online by Cambridge University Press:  26 May 2016

Dániel Apai ,
Ilaria Pascucci ,
Thomas Henning ,
Michael F. Sterzik ,
Randolf Klein ,
Dimitri Semenov ,
Eike Guenther  and
Bringfried Stecklum
Dániel Apai
Affiliation:
MPIA, Königstuhl 17, Heidelberg, D-69117 Germany and AIU Jena, Schillergässchen 2–3, D-07745 Jena, Germany
Ilaria Pascucci
Affiliation:
MPIA, Königstuhl 17, Heidelberg, D-69117 Germany and AIU Jena, Schillergässchen 2–3, D-07745 Jena, Germany
Thomas Henning
Affiliation:
MPIA, Königstuhl 17, Heidelberg, D-69117 Germany and AIU Jena, Schillergässchen 2–3, D-07745 Jena, Germany
Michael F. Sterzik
Affiliation:
ESO, Alonso de Cordova 3107, Vitacura, Casilla 19001, Santiago 19, Chile
Randolf Klein
Affiliation:
AIU Jena, Schillergässchen 2–3, D-07745 Jena, Germany
Dimitri Semenov
Affiliation:
AIU Jena, Schillergässchen 2–3, D-07745 Jena, Germany
Eike Guenther
Affiliation:
TLS Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany
Bringfried Stecklum
Affiliation:
TLS Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany

Abstract

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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 Hα2, 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 but not by a flared one.

Type
Part 3. Circumsubstellar Matter
Information
Symposium - International Astronomical Union , Volume 211: Brown Dwarfs , 2003 , pp. 137 - 138
Copyright
Copyright © Astronomical Society of the Pacific 2001 

References

Apai, D., Pascucci, I., Henning, Th., Sterzik, M. F., Klein, R., Semenov, D., Günther, E., & Stecklum, B. 2002, ApJ, 573, L115 CrossRefGoogle Scholar
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