title: Parent volatiles in comet 9P/Tempel 1: before and after impact.
abstract: We quantified eight parent volatiles (H2O, C2H6, HCN, CO, CH3OH, H2CO, C2H2, and CH4) in the Jupiter-family comet Tempel 1 using high-dispersion infrared spectroscopy in the wavelength range 2.8 to 5.0 micrometers. The abundance ratio for ethane was significantly higher after impact, whereas those for methanol and hydrogen cyanide were unchanged. The abundance ratios in the ejecta are similar to those for most Oort cloud comets, but methanol and acetylene are lower in Tempel 1 by a factor of about 2. These results suggest that the volatile ices in Tempel 1 and in most Oort cloud comets originated in a common region of the protoplanetary disk.
authors.affiliation: Solar System Exploration Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA. michael.j.mumma@nasa.gov
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Mumma
authors.forename: Michael A
authors.initials: MA
authors.lastname: DiSanti
authors.forename: Karen
authors.initials: K
authors.lastname: Magee-Sauer
authors.forename: Boncho P
authors.initials: BP
authors.lastname: Bonev
authors.forename: Geronimo L
authors.initials: GL
authors.lastname: Villanueva
authors.forename: Hideyo
authors.initials: H
authors.lastname: Kawakita
authors.forename: Neil
authors.initials: N
authors.lastname: Dello Russo
authors.forename: Erika L
authors.initials: EL
authors.lastname: Gibb
authors.forename: Geoffrey A
authors.initials: GA
authors.lastname: Blake
authors.forename: James E
authors.initials: JE
authors.lastname: Lyke
authors.forename: Randall D
authors.initials: RD
authors.lastname: Campbell
authors.forename: Joel
authors.initials: J
authors.lastname: Aycock
authors.forename: Al
authors.initials: A
authors.lastname: Conrad
authors.forename: Grant M
authors.initials: GM
authors.lastname: Hill
mesh_terms: D018538:Jupiter; D019110:Meteoroids; D009930:Organic Chemicals / Q000032:analysis; D013057:Spectrum Analysis; D014835:Volatilization
chemical_list: D009930:Organic Chemicals