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Title:
The Distribution, Excitation, and Formation of Cometary Molecules: Methanol, Methyl Cyanide, and Ethylene Glycol
Authors:
Remijan, Anthony J.; Milam, Stefanie N.; Womack, Maria; Apponi, A. J.; Ziurys, L. M.; Wyckoff, Susan; A'Hearn, M. F.; de Pater, Imke; Forster, J. R.; Friedel, D. N.; Palmer, Patrick; Snyder, L. E.; Veal, J. M.; Woodney, L. M.; Wright, M. C. H.
Affiliation:
AA(National Radio Astronomy Observatory, 520 Edgemont Road, Charlottesville, VA 22901; .), AB(NASA Astrobiology Institute, Department of Chemistry, Department of Astronomy, and Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721; , .; Current address: NASA Ames Research Center, Astrophysics Branch, MS 245-6, Moffett Field, CA 94035-1000 .), AC(Department of Physics and Astronomy, St. Cloud State University, St. Cloud, MN 56301; .), AD(NASA Astrobiology Institute, Department of Chemistry, Department of Astronomy, and Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721; , .), AE(NASA Astrobiology Institute, Department of Chemistry, Department of Astronomy, and Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721; , .), AF(Department of Physics and Astronomy, Arizona State University, Tempe, AZ 85287; .), AG(Department of Astronomy, University of Maryland, College Park, MD 20742-2421 .), AH(Department of Astronomy, University of California, Berkeley, CA 94720; , , .), AI(Department of Astronomy, University of California, Berkeley, CA 94720; , , .), AJ(Department of Astronomy, University of Illinois, 1002 West Green Street, Urbana, IL 61801; , .), AK(Department of Astronomy and Astrophysics, University of Chicago, Chicago, IL 60637; .), AL(Department of Astronomy, University of Illinois, 1002 West Green Street, Urbana, IL 61801; , .), AM(Department of Astronomy, University of Illinois, 1002 West Green Street, Urbana, IL 61801; , .; Current address: Southwestern College, 900 Otay Lakes Road, Chula Vista, CA 91910; .), AN(Department of Physics, California State University, San Bernardino, CA 92407; .), AO(Department of Astronomy, University of California, Berkeley, CA 94720; , , .)
Publication:
The Astrophysical Journal, Volume 689, Issue 1, pp. 613-621. (ApJ Homepage)
Publication Date:
12/2008
Origin:
UCP
ApJ Keywords:
Astrobiology, comets: individual (Hale Bopp [C/1995 01]), comets: individual (LINEAR [C/2002 T7]), Molecular Processes, Radio Lines: Solar System, Techniques: Interferometric
DOI:
10.1086/592242
Bibliographic Code:
2008ApJ...689..613R

Abstract

We present an interferometric and single-dish study of small organic species toward Comets C/1995 O1 (Hale-Bopp) and C/2002 T7 (LINEAR) using the BIMA interferometer at 3 mm and the ARO 12 m telescope at 2 mm. For Comet Hale-Bopp, both the single-dish and interferometer observations of CH3OH indicate an excitation temperature of 105+/-5 K and an average production rate ratio Q(CH3OH)/Q(H2O)~1.3% at ~1 AU. In addition, the aperture synthesis observations of CH3OH suggest a distribution well described by a spherical outflow and no evidence of significant extended emission. Single-dish observations of CH3CN in Comet Hale-Bopp indicate an excitation temperature of 200+/-10 K and a production rate ratio of Q(CH3CN)/Q(H2O)~0.017% at ~1 AU. The nondetection of a previously claimed transition of cometary (CH2OH)2 toward Comet Hale-Bopp with the 12 m telescope indicates a compact distribution of emission, D<9'' (<8500 km). For the single-dish observations of Comet T7 LINEAR, we find an excitation temperature of CH3OH of 35+/-5 K and a CH3OH production rate ratio of Q(CH3OH)/Q(H2O)~1.5% at ~0.3 AU. Our data support current chemical models that CH3OH, CH3CN, and (CH2OH)2 are parent nuclear species distributed into the coma via direct sublimation off cometary ices from the nucleus with no evidence of significant production in the outer coma.
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