Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.1004r&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #10.04; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
Scientific paper
The brown dwarf planetary system 2MASSW J1207334-393254 (2M1207) consists of a 30 MJUP primary and a 5 MJUP extrasolar planet. The primary is known to be undergoing active accretion, and harbors a circumsubstellar disk of gas and dust, detected by excess emission in the IR. Previous measurements of IR excess emission were too few in number to correctly model the disk spectral energy distribution. Existing results suggest a high inclination angle (≥ 60º) with an inner hole that can be fit by both a large grain size, large inclination angle flared disk and a small grain size flat disk. Using our SPITZER observations from 3.6 to 24 micron, we have used disk models described in Walker et al. (2004) to correctly characterize the disk around 2M1207, and determine important disk parameters, such as, the inclination angle, the disk midplane temperature and scale height at different radii, the disk mass, accretion rate and the inner and outer radii. We believe our 24 micron data point is valuable in determining the surface geometry of the disk, as it probes more distant regions ( 1-5 AU) from the central object. An estimate of the outer disk radius is important to show if the planetary companion has any effect on the disk emission. We have also investigated the effects on disk geometry by varying the grain sizes in different disk regions, which is important in understanding if gas and dust are well mixed in this brown dwarf disk.
Gizis John E.
Riaz Basmah
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