A survey of organic volatile species in comet C/1999 H1 (Lee) using NIRSPEC at the Keck Observatory

Citation
Mj. Mumma et al., A survey of organic volatile species in comet C/1999 H1 (Lee) using NIRSPEC at the Keck Observatory, ASTROPHYS J, 546(2), 2001, pp. 1183-1193
Citations number
60
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Space Sciences
Journal title
ASTROPHYSICAL JOURNAL
ISSN journal
0004-637X → ACNP
Volume
546
Issue
2
Year of publication
2001
Part
1
Pages
1183 - 1193
Database
ISI
SICI code
0004-637X(20010110)546:2<1183:ASOOVS>2.0.ZU;2-U
Abstract
The organic volatile composition of the long-period comet C/1999 H1 (Lee) w as investigated using the first of a new generation of cross-dispersed cryo genic infrared spectrometers (NIRSPEC, at the Keck Observatory atop Mauna K ea, HI). On 1999 August 19-21 the organics spectral region (2.9-3.7 mum) wa s completely sampled at both moderate and high dispersion, along with the C O fundamental region (near 4.67 mum), revealing emission from water, carbon monoxide, methanol, methane, ethane, acetylene, and hydrogen cyanide. Many new multiplets from OH in the 1-0 band were seen in prompt emission, and n umerous new spectral lines were detected. Several spectral extracts are sho wn, and global production rates are presented for seven parent volatiles. C arbon monoxide is strongly depleted in comet Lee relative to comets Hyakuta ke and Hale-Bopp, demonstrating that chemical diversity occurred in the gia nt-planets' nebular region.