Direct measurement of the CO depletion in the Elias 18 circumstellar disk

被引：16

作者：

Shuping, RY

Chiar, JE

Snow, TP

Kerr, T

机构：

[1] Univ Colorado, Ctr Astrophys & Space Astron, Boulder, CO 80309 USA

[2] Univ Calif Los Angeles, Div Astron & Astrophys, Los Angeles, CA 90095 USA

[3] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA

[4] Joint Astron Ctr, Hilo, HI 96720 USA

来源：

ASTROPHYSICAL JOURNAL | 2001年 / 547卷 / 02期

基金：

美国国家航空航天局;

关键词：

infrared : ISM : lines and bands; ISM : abundances; ISM : clouds; ISM : molecules;

D O I：

10.1086/318899

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

In this Letter we present low-resolution 2.3 mum and high-resolution 4.6 mum spectra of Elias 18 (IRAS 04369+2539), a low-mass young stellar object (YSO) in the Taurus molecular cloud. The 2.3 mm spectrum shows CO band head emission (v = 2-0) indicating a circumstellar disk. The 4.6 mum spectrum shows very weak CO absorption in the lowest J levels. Comparing preexisting CO ice observations to our data indicates that there is at least 30 times less gas-phase CO than solid-state CO in the outer, cold (T < 20 K) regions of the disk. High depletions of CO in YSO disks have been inferred from millimeter-wave CO emission and detailed disk models, but Elias 18 is the first case for which both gas- and ice-phase data have been directly compared.

引用

页码：L161 / L164

页数：4

共 30 条

[1] Evolution of molecular abundance in gaseous disks around young stars: Depletion of CO molecules [J].