彗星C/1995 O1（海尔-波普彗星）中的氘：氰化氘的探测

Deuterium in comet C/1995 O1 (Hale-Bopp): detection of DCN.

作者信息

Meier R, Owen T C, Jewitt D C, Matthews H E, Senay M, Biver N, Bockel e-Morvan D, Crovisier J, Gautier D

机构信息

University of Hawaii, Institute for Astronomy, 2680 Woodlawn Drive, Honolulu, HI 96822, USA.

出版信息

Science. 1998 Mar 13;279(5357):1707-10. doi: 10.1126/science.279.5357.1707.

DOI:10.1126/science.279.5357.1707

PMID:9497286

Abstract

Deuterated hydrogen cyanide (DCN) was detected in a comet, C/1995 O1 (Hale-Bopp), with the use of the James Clerk Maxwell Telescope on Mauna Kea, Hawaii. The inferred deuterium/hydrogen (D/H) ratio in hydrogen cyanide (HCN) is (D/H)HCN = (2.3 +/- 0.4) x 10(-3). This ratio is higher than the D/H ratio found in cometary water and supports the interstellar origin of cometary ices. The observed values of D/H in water and HCN imply a kinetic temperature >/=30 +/- 10 K in the fragment of interstellar cloud that formed the solar system.

摘要

利用位于夏威夷莫纳克亚山的詹姆斯·克拉克·麦克斯韦望远镜，在彗星C/1995 O1（海尔-波普彗星）中检测到了氘代氰化氢（DCN）。推断出氰化氢（HCN）中的氘/氢（D/H）比为（D/H）HCN =（2.3±0.4）×10⁻³。该比值高于在彗星水冰中发现的D/H比，这支持了彗星冰的星际起源。在水冰和HCN中观测到的D/H值意味着形成太阳系的星际云碎片中的动力学温度≥30±10 K。