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Mid-IR Spectroscopy of the Debris Disks in the TW Hydrae Association

Published online by Cambridge University Press:  26 May 2016

Michael L. Sitko ,
David K. Lynch ,
Ray W. Russell  and
Carol A. Grady
Michael L. Sitko
Affiliation:
Department of Physics, University of Cincinnati, Cincinnati OH 45221-0011, USA
David K. Lynch
Affiliation:
The Aerospace Corporation, M2/266, Los Angeles CA 90009-2957, USA
Ray W. Russell
Affiliation:
The Aerospace Corporation, M2/266, Los Angeles CA 90009-2957, USA
Carol A. Grady
Affiliation:
NOAO, Code 681, NASA Goddard Space Flight Center, Greenbelt MD 20771, USA

Abstract

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Spectroscopic observation between 3-14 μm of 3 stars in the TW Hya Association were obtained using the Aerospace Corporation Broadband Array Spectrograph System (BASS) on the NASA IRTF telescope. The targets observed were TW Hya, HR 4796A, and HD 98800. Both of the late-type stars, TW Hya and HD 98800, exhibit a strong 10 μm silicate emission band. The strong emission indicates the presence of small dust grains close to the star, at angular distances not currently accessible to coronagraphic techniques. The spectral structure due to crystalline material that is present in some young early-type stars (HD 163296, HD 31648, etc.) is not apparent in these two objects. For HR 4796A, the dust emission is weak.

Type
Part IV: Protoplanetary and β Pic disks
Information
Symposium - International Astronomical Union , Volume 202: Planetary Systems in the Universe – Observation, Formation and Evolution , 2004 , pp. 368 - 370
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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