Radial Distribution of Molecules and Ions in the Protoplanetary Around IM Lup

Details Radial Distribution of Molecules and Ions in the Protoplanetary Around IM Lup Radial Distribution of Molecules and Ions in the Protoplanetary Around IM Lup

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733915s&link_type=abstract

American Astronomical Society, AAS Meeting #217, #339.15; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present spatially and spectroscopically resolved Submillimeter Array (SMA) observations of 12CO J=2-1, 13CO J=2-1, DCO+ J=3-2, N2H+ J=3-2, and H2CO J=4(14)-3(13) line emission from the IM Lup protoplanetary disk. We use Monte Carlo radiative transfer calculations to compare the SMA visibilities with tapered disk models, and use the results to constrain the outer radii of the emission regions. N2H+ and H2CO are proposed to trace dust grains at temperatures below 20 K, and DCO+ is proposed to trace gas temperatures below 40 K. The inferred outer radii for N2H+ and H2CO are both 600 AU, and 300-600 AU for DCO+. These values are consistent with thermally decoupled gas and dust in the outer disk. This work is supported in part by the NSF REU and DOD ASSURE programs under NSF grant no. 0754568 and by the Smithsonian Institution.

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