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A Comparative Anatomy of Dusty Disks Imaged by NICMOS1

Published online by Cambridge University Press:  26 May 2016

Glenn Schneider ,
Dean C. Hines ,
Murray Silverstone ,
Alycia J. Weinberger  and
the NICMOS/IDT EONS Team
Glenn Schneider
Affiliation:
Steward Obs., U. Az., 933 N. Cherry Ave., Tucson, AZ, 85721 USA
Dean C. Hines
Affiliation:
Steward Obs., U. Az., 933 N. Cherry Ave., Tucson, AZ, 85721 USA
Murray Silverstone
Affiliation:
Steward Obs., U. Az., 933 N. Cherry Ave., Tucson, AZ, 85721 USA
Alycia J. Weinberger
Affiliation:
Dept. of Physics & Astronomy, UCLA, Los Angeles, CA, 90095 USA

Abstract

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Using the Near Infrared Camera and Multi-Object Spectrometer (NICMOS) on the Hubble Space Telescope we have conducted a coronagraphic imaging survey of 18 main sequence stars with large infrared excesses, searching for circumstellar dust (debris) in scattered light. Dusty disks with radial and hemispheric brightness anisotropies and complex morphologies, both possibly indicative of dynamical interactions with unseen planetary mass companions, were spatially resolved and imaged around three young (≲ 10Myr old) stars. From these observations we describe the debris systems around: a) HR 4796A (A0V), a 70 AU radius ring less than 14 AU wide with unequal ansal flux densities; b) HD 141569A (Herbig Ae/Be), a 400 AU radius disk with a 40 AU wide gap; and c) TW Hya (K7 T-Tauri), a pole-on circularly symmetric disk with a radial break in its surface density of scattering particles. Additionally, our non-detection of scattered light and high precision photometry of a fourth system of similar age, HD 98800 A/B, coupled with mid and thermal IR measurements, greatly constrain a likely model for the debris about the B component.

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. 308 - 315
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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