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

Mandell, Avi M. and Mumma, Michael J. and Blake, Geoffrey A. and Bonev, Boncho P. and Villanueva, Geronimo L. and Salyk, Colette (2008) Discovery of OH in circumstellar disks around young intermediate-mass stars. Astrophysical Journal Letters, 681 (1). L25-L28. ISSN 2041-8205. doi:10.1086/590180.

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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 μm 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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Mandell, Avi M.0000-0002-8119-3355
Blake, Geoffrey A.0000-0003-0787-1610
Salyk, Colette0000-0003-3682-6632
Additional Information:© 2008 The American Astronomical Society. Received 2008 March 3; accepted 2008 May 19; published 2008 June 11. This research was supported by the Goddard Center for Astrobiology and the NASA Postdoctoral Fellowship Program. We thank the anonymous referee for constructive comments. Facilities: Keck:II(NIRSPEC).
Funding AgencyGrant Number
Goddard Center for AstrobiologyUNSPECIFIED
Subject Keywords:circumstellar matter; infrared: stars; molecular processes; planetary systems: formation; planetary systems: protoplanetary disks; stars: pre-main-sequence
Issue or Number:1
Record Number:CaltechAUTHORS:20090505-090050197
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14158
Deposited By: Tony Diaz
Deposited On:11 May 2009 21:19
Last Modified:08 Nov 2021 22:43

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