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TEXES Observations of Pure Rotational H_2 Emission from AB Aurigae

Bitner, Martin A. and Richter, Matthew J. and Lacy, John H. and Greathouse, Thomas K. and Jaffe, Daniel T. and Blake, Geoffrey A. (2007) TEXES Observations of Pure Rotational H_2 Emission from AB Aurigae. Astrophysical Journal Letters, 661 (1). L69-L72. ISSN 2041-8205.

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We present observations of pure rotational molecular hydrogen emission from the Herbig Ae star, AB Aur. Our observations were made using the Texas Echelon Cross Echelle Spectrograph (TEXES) at the NASA Infrared Telescope Facility and the Gemini North Observatory. We searched for H_2 emission in the S(1), S(2), and S(4) lines at high spectral resolution and detected all three. By fitting a simple model for the emission in the three transitions, we derive T = 670 ± 40 K and M = 0.52 ± 0.15 M_⊙ for the emitting gas. On the basis of the 8.5 km s^(-1) FWHM of the S(2) line, assuming the emission comes from the circumstellar disk, and with an inclination estimate of the AB Aur system taken from the literature, we place the location for the emission near 18 AU. Comparison of our derived temperature to a disk structure model suggests that UV and X-ray heating are important in heating the disk atmosphere.

Item Type:Article
Related URLs:
URLURL TypeDescription DOIArticle
Richter, Matthew J.0000-0002-8594-2122
Lacy, John H.0000-0001-6783-2328
Jaffe, Daniel T.0000-0003-3577-3540
Blake, Geoffrey A.0000-0003-0787-1610
Additional Information:© 2007 The American Astronomical Society. Received 2007 February 22; accepted 2007 April 6; published 2007 May 2. We thank the Gemini staff, and John White in particular, for their support in getting TEXES to work on Gemini North. We thank Rob Robinson for useful discussions on the analysis of our data. The development of TEXES was supported by grants from the NSF and the NASA/USRA SOFIA project. Modification of TEXES for use on Gemini was supported by Gemini Observatory. Observations with TEXES were supported by NSF grant AST 06-07312. This work is based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (US), the Particle Physics and Astronomy Research Council (UK), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), CNPq (Brazil), and CONICET (Argentina).
Funding AgencyGrant Number
Gemini ObservatoryUNSPECIFIED
NSFAST 06-07312
Particle Physics and Astronomy Research Council (PPARC)UNSPECIFIED
National Research Council of CanadaUNSPECIFIED
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)UNSPECIFIED
Australian Research CouncilUNSPECIFIED
Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)UNSPECIFIED
Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET)UNSPECIFIED
Subject Keywords:circumstellar matter; infrared : stars; planetary systems : protoplanetary disks; stars : individual (AB Aurigae); stars : pre-main-sequence
Issue or Number:1
Record Number:CaltechAUTHORS:20091020-101557556
Persistent URL:
Official Citation:TEXES Observations of Pure Rotational H2 Emission from AB Aurigae Martin A. Bitner, Matthew J. Richter, John H. Lacy, Thomas K. Greathouse, Daniel T. Jaffe, and Geoffrey A. Blake 2007 ApJ 661 L69-L72 doi: 10.1086/518717
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:16393
Deposited By: Tony Diaz
Deposited On:21 Oct 2009 17:57
Last Modified:09 Mar 2020 13:19

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