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Title:
Discovery of a Candidate Protoplanetary Disk around the Embedded Source IRc9 in Orion
Authors:
Smith, Nathan; Bally, John
Affiliation:
AA(Center for Astrophysics and Space Astronomy, University of Colorado, 389 UCB, Boulder, CO 80309; ; Hubble Fellow.), AB(Center for Astrophysics and Space Astronomy, University of Colorado, 389 UCB, Boulder, CO 80309; )
Publication:
The Astrophysical Journal, Volume 622, Issue 1, pp. L65-L68. (ApJL Homepage)
Publication Date:
03/2005
Origin:
UCP
ApJ Keywords:
Stars: Planetary Systems: Protoplanetary Disks, Stars: Formation, Stars: Pre-Main-Sequence
DOI:
10.1086/429373
Bibliographic Code:
2005ApJ...622L..65S

Abstract

We report the detection of spatially extended mid-infrared emission around the luminous embedded star IRc9 in OMC-1, as seen in 8.8, 11.7, and 18.3 μm images obtained with the Thermal-Region Camera and Spectrograph on Gemini South. The extended emission is asymmetric, and the morphology is reminiscent of warm dust disks around other young stars. The putative disk has a radius of roughly 1.5" (700 AU) and a likely dust mass of almost 10 M⊕. The infrared spectral energy distribution of IRc9 indicates a total luminosity of ~100 Lsolar, implying that it will become an early A-type star when it reaches the main sequence. Thus, the candidate disk around IRc9 may be a young analog of the planetary debris disks around Vega-like stars and the disks of Herbig Ae stars, and may provide a laboratory in which to study the earliest phases of planet formation. A disk around IRc9 may also add weight to the hypothesis that an enhanced T Tauri-like wind from this star has influenced the molecular outflow from the OMC-1 core.

Based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (US), the Particle Physics and Astronomy Research Council (UK), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), CNPq (Brazil), and CONICET (Argentina).

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