Detection of abundant ethane and methane, along with carbon monoxide and water, in comet C/1996 B2 hyakutake: Evidence for interstellar origin

Michael J. Mumma, Michael A. DiSanti, Neil Dello Russo, Marina Fomenkova, Karen Magee-Sauer, Charles D. Kaminski, David X. Xie

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258 Scopus citations

Abstract

The saturated hydrocarbons ethane (C2H6) and methane (CH4) along with carbon monoxide (CO) and water (H2O) were detected in comet C/1996 B2 Hyakutake with the use of high-resolution infrared spectroscopy at the NASA Infrared Telescope Facility on Mauna Kea, Hawaii. The inferred production rates of molecular gases from the icy, cometary nucleus (in molecules per second) are 6.4 × 1026 for C2H6, 1.2 × 1027 for CH4, 9.8 × 1027 for CO, and 1.7 × 1029 for H2O. An abundance of C2H6 comparable to that of CH4 implies that ices in C/1996 B2 Hyakutake did not originate in a thermochemically equilibrated region of the solar nebula. The abundances are consistent with a kinetically controlled production process, but production of C2H6 by gas-phase ion molecule reactions in the natal cloud core is energetically forbidden. The high C2H6/CH4 ratio is consistent with production of C2H6 in icy grain mantles in the natal cloud, either by photolysis of CH4-rich ice or by hydrogen-addition reactions to acetylene condensed from the gas phase.

Original languageEnglish (US)
Pages (from-to)1310-1314
Number of pages5
JournalScience
Volume272
Issue number5266
DOIs
StatePublished - May 31 1996
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General

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