Organic astrochemistry: observations of interstellar ketene |
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| Authors: | R Ruiterkamp S B Charnley H M Butner H-C Huang S D Rodgers Y-J Kuan P Ehrenfreund |
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| Institution: | (1) Leiden Observatory, PO Box 9513, 2300 RA Leiden, The Netherlands;(2) Space Science & Astrobiology Division, MS 245-3, NASA Ames Research Center, Moffett Field, CA 94035, USA;(3) Department of Physics, James Madison University, 901 Carrier Drive, Harrisonburg, VA 22807-7702, USA;(4) Department of Earth Sciences, National Taiwan Normal University, 88 Sec. 4 Ting-Chou Rd., Taipei, 116, Taiwan;(5) Academia Sinica Institute of Astronomy & Astrophysics (ASIAA), Taipei, 106, Taiwan;(6) Leiden Institute of Chemistry, PO Box 9502, 2300 RA Leiden, The Netherlands |
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| Abstract: | We have observed emission from both ortho and para spin states of ketene (CH2CO) towards several deeply-embedded protostars. The low CH2CO fractional abundances (∼10−10) and the rotation temperatures (∼20 K) are consistent with emission from the cooler envelope. We compare our results with
previous studies and discuss possible production pathways to interstellar ketene. We suggest that, if low observed excitation
temperatures of CH2CO, CH3CHO and H2CO are indicative of their absence from the hot core region, then this may be due to the extensive hydrogenation of pre-existing
grain mantles prior to evaporation into the inner envelope, leading to lower abundances of these compounds and to mantles
rich in alcohols. |
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| Keywords: | Astrochemistry ISM: abundances ISM: clouds ISM: molecules Stars: formation |
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