Imaging of the CO Snow Line in a Solar Nebula Analog

被引：216

作者：

Qi, Chunhua ^{[1
]}

Oeberg, Karin I. ^{[2
,3
]}

Wilner, David J. ^{[1
]}

D'Alessio, Paola ^{[4
]}

Bergin, Edwin ^{[5
]}

Andrews, Sean M. ^{[1
]}

Blake, Geoffrey A. ^{[6
]}

Hogerheijde, Michiel R. ^{[7
]}

van Dishoeck, Ewine F. ^{[7
,8
]}

机构：

[1] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[2] Univ Virginia, Dept Chem, Charlottesville, VA 22904 USA

[3] Univ Virginia, Dept Astron, Charlottesville, VA 22904 USA

[4] Univ Nacl Autonoma Mexico, Ctr Radioastron & Astrofis, Mexico City 58089, DF, Mexico

[5] Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA

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

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

[8] Max Planck Inst Extraterr Phys, D-85748 Garching, Germany

来源：

SCIENCE | 2013年 / 341卷 / 6146期

基金：

美国国家科学基金会;

关键词：

PROTOPLANETARY DISKS; STAR-FORMATION; X-RAY; ICE; CHEMISTRY; MOLECULES; WATER; PLANETESIMALS; EVOLUTION; EMISSION;

D O I：

10.1126/science.1239560

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Planets form in the disks around young stars. Their formation efficiency and composition are intimately linked to the protoplanetary disk locations of "snow lines" of abundant volatiles. We present chemical imaging of the carbon monoxide (CO) snow line in the disk around TW Hya, an analog of the solar nebula, using high spatial and spectral resolution Atacama Large Millimeter/Submillimeter Array observations of diazenylium (N2H+), a reactive ion present in large abundance only where CO is frozen out. The N2H+ emission is distributed in a large ring, with an inner radius that matches CO snow line model predictions. The extracted CO snow line radius of similar to 30 astronomical units helps to assess models of the formation dynamics of the solar system, when combined with measurements of the bulk composition of planets and comets.

引用

页码：630 / 632

页数：3

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