THE HCN-WATER RATIO IN THE PLANET FORMATION REGION OF DISKS

被引：68

作者：

Najita, Joan R. ^{[1
]}

Carr, John S. ^{[2
]}

Pontoppidan, Klaus M. ^{[3
]}

Salyk, Colette ^{[1
]}

van Dishoeck, Ewine F. ^{[4
]}

Blake, Geoffrey A. ^{[5
]}

机构：

[1] Natl Opt Astron Observ, Tucson, AZ 85719 USA

[2] USN, Res Lab, Washington, DC 20375 USA

[3] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[4] Leiden Univ, Leiden Observ, NL-2300 RA Leiden, Netherlands

[5] CALTECH, Div Geol & Planetary Sci, Pasadena, CA 91125 USA

来源：

ASTROPHYSICAL JOURNAL | 2013年 / 766卷 / 02期

关键词：

circumstellar matter; protoplanetary disks; stars: pre-main sequence; MIDINFRARED MOLECULAR-EMISSION; T-TAURI STARS; ORGANIC-MOLECULES; PROTOPLANETARY DISKS; CIRCUMSTELLAR DISKS; SPITZER SURVEY; EVOLUTION; MODELS; DUST; II;

D O I：

10.1088/0004-637X/766/2/134

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We find a trend between the mid-infrared HCN/H2O flux ratio and submillimeter disk mass among T Tauri stars in Taurus. While it may seem puzzling that the molecular emission properties of the inner disk (<few AU) are related to the properties of the outer disk (beyond similar to 20 AU) probed by the submillimeter continuum, an interesting possible interpretation is that the trend is a result of planetesimal and protoplanet formation. Because objects this large are decoupled from the accretion flow, when they form, they can lock up water (and oxygen) beyond the snow line, thereby enhancing the C/O ratio in the inner disk and altering the molecular abundances there. We discuss the assumptions that underlie this interpretation, a possible alternative explanation, and related open questions that motivate future work. Whatever its origin, understanding the meaning of the relation between the HCN/H2O ratio and disk mass is of interest as trends like this among T Tauri disk properties are relatively rare.

引用

页数：8

共 31 条

[1] Formation of simple organic molecules in inner T Tauri disks [J].