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Looking for Pure Rotational H_2 Emission from Protoplanetary Disks

Richter, Matthew J. and Jaffe, Daniel T. and Blake, Geoffrey A. and Lacy, John H. (2002) Looking for Pure Rotational H_2 Emission from Protoplanetary Disks. Astrophysical Journal Letters, 572 (2). L161-L164. ISSN 2041-8205. doi:10.1086/341879.

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We report on a limited search for pure rotational molecular hydrogen emission associated with young, pre-main-sequence stars. We looked for H_2 v = 0, J = 3 → 1 and 4 → 2 emission in the mid-infrared using the Texas Echelon Cross Echelle Spectrograph at NASA's 3 m Infrared Telescope Facility. The high spectral and spatial resolutions of our observations lead to more stringent limits on narrow-line emission close to the source than previously achieved. One star, AB Aur, shows a possible (2 σ) H_2 detection, but further observations are required to make a confident statement. Our nondetections suggest that a significant fraction, perhaps all, of previously reported H_2 emission toward these objects could be extended on scales of 5" or more.

Item Type:Article
Related URLs:
URLURL TypeDescription
Richter, Matthew J.0000-0002-8594-2122
Jaffe, Daniel T.0000-0003-3577-3540
Blake, Geoffrey A.0000-0003-0787-1610
Lacy, John H.0000-0001-6783-2328
Additional Information:© 2002 American Astronomical Society. Received 2002 March 12; accepted 2002 May 16; published 2002 May 29. We are happy to acknowledge the day and night staff at the Infrared Telescope Facility; without their hard work, none of this observing would be possible. We appreciate the comments of Ewine van Dishoeck and an anonymous referee. This work was supported by grant TARP 00365-0473-1999 from the Texas Advanced Research Program. M. J. R. acknowledges USRA grant USRA 8500-98-008 through the SOFIA program. This research has made use of NASA’s Astrophysics Data System and the SIMBAD database operated at the Centre de Données astronomiques de Strasbourg, France.
Funding AgencyGrant Number
Texas Advanced Research ProgramTARP 00365-0473-1999
USRA-SOFIA ProgramUSRA 8500-98-008
Subject Keywords:circumstellar matter; infrared: stars; planetary systems: protoplanetary disks; stars: pre-main sequence
Issue or Number:2
Record Number:CaltechAUTHORS:20120919-072302240
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Official Citation:Looking for Pure Rotational H2 Emission from Protoplanetary Disks Matthew J. Richter et al. 2002 ApJ 572 L161
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34193
Deposited By: Ruth Sustaita
Deposited On:19 Sep 2012 15:39
Last Modified:09 Nov 2021 23:07

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