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LkHα 330: Evidence for dust clearing through resolved submillimeter imaging

Brown, J. M. and Blake, G. A. and Qi, C. and Dullemond, C. P. and Wilner, D. J. (2008) LkHα 330: Evidence for dust clearing through resolved submillimeter imaging. Astrophysical Journal Letters, 675 (2). L109-L112. ISSN 2041-8205. doi:10.1086/533464.

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Mid-infrared spectrophotometric observations have revealed a small subclass of circumstellar disks with spectral energy distributions (SEDs) suggestive of large inner gaps with low dust content. However, such data provide only an indirect and model-dependent method of finding central holes. We present here the direct characterization of a 40 AU radius inner gap in the disk around LkHα 330 through 340 GHz (880 μm) dust continuum imaging with the Submillimeter Array (SMA). This large gap is fully resolved by the SMA observations and mostly empty of dust with less than 1.3 × 10^−6 M☉ of solid particles inside of 40 AU. Gas (as traced by accretion markers and CO M-band emission) is still present in the inner disk and the outer edge of the gap rises steeply—features in better agreement with the underlying cause being gravitational perturbation than a more gradual process such as grain growth. Importantly, the good agreement of the spatially resolved data and spectrophotometry-based model lends confidence to current interpretations of SEDs with significant dust emission deficits as arising from disks with inner gaps or holes. Further SED-based searches can therefore be expected to yield numerous additional candidates that can be examined at high spatial resolution.

Item Type:Article
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URLURL TypeDescription
Blake, G. A.0000-0003-0787-1610
Qi, C.0000-0001-8642-1786
Wilner, D. J.0000-0003-1526-7587
Additional Information:© 2008 The American Astronomical Society. Received 2007 December 20; accepted 2008 January 23; published 2008 February 19. The authors wish to thank SMA personnel for their assistance in acquiring the very extended configuration data reported here, and the support provided by the NASA Spitzer Space Telescope Legacy Science Program, through contracts 1224608 and 1230779 issued by the Jet Propulsion Laboratory, California Institute of Technology, under NASA contract 1407, and the NASA Origins of Solar Systems Program through grants NNG05GH94G and NNG05GI81G.
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Subject Keywords:planetary systems: protoplanetary disks; stars: pre-main-sequence
Issue or Number:2
Record Number:CaltechAUTHORS:BROWNapjl08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13714
Deposited By: Tony Diaz
Deposited On:09 Jul 2009 20:28
Last Modified:08 Nov 2021 22:40

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