Discovery of OH in circumstellar disks around young intermediate-mass stars

被引：42

作者：

Mandell, Avi M. ^{[1
]}

Mumma, Michael J. ^{[1
]}

Blake, Geoffrey A. ^{[2
]}

Bonev, Boncho P. ^{[1
,3
]}

Villanueva, Geronimo L. ^{[1
]}

Salyk, Colette ^{[2
]}

机构：

[1] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

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

[3] Catholic Univ Amer, Dept Phys, Washington, DC 20064 USA

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2008年 / 681卷 / 01期

关键词：

circumstellar matter; infrared : stars; molecular processes; planetary systems : formation; planetary systems : protoplanetary disks; stars : pre-main-sequence;

D O I：

10.1086/590180

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We detect emission from multiple low-excitation rovibrational transitions of OH from the two Herbig Ae stars AB Aurigae and MWC 758 in the 3.0-3.7 mu m wavelength range (L band), using the NIRSPEC instrument on Keck II. The inner radius for the emitting region in both stars is close to 1 AU. We compare an optically thin LTE model and a thin-wedge fluorescence model, finding rotational temperatures of 650-800 K and OH abundances of 10(42)-10(45) molecules for the two stars. Comparisons with current chemical models support the fluorescence excitation model for AB Aurigae and possibly MWC 758, but further observations and detailed modeling are necessary to improve constraints on OH emission in different disk environments.

引用

页码：L25 / L28

页数：4

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