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H_2 Emission From Disks Around Herbig Ae and T Tauri Stars

Thi, W. F. and van Dishoeck, E. F. and Blake, G. A. and van Zadelhoff, G. J. and Hogerheijde, M. R. and Mannings, V. and Sargent, A. I. and Becklin, E. E. and Horn, J. and Zuckerman, B. and Koerner, D. and Mundy, L. G. and Waters, L. B. F. M. and Wesselius, P. R. and van den Ancker, M. E. and Natta, A. and Waelkens, C. and Malfait, K. (1999) H_2 Emission From Disks Around Herbig Ae and T Tauri Stars. In: The Universe as Seen by ISO. ESA SP. No.427. European Space Agency , Noordwijk, Netherlands, pp. 529-532. ISBN 9789290927082

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We present the initial results of a deep ISO-SWS survey for the low J pure rotational emission lines of H2 toward a number of Herbig Ae and T Tauri stars. The objects are selected to be as isolated as possible from molecular clouds, with a spectral energy distribution characteristic of a circumstellar disk. For most of them the presence of a disk has been established directly by millimeter interferometry. The S (1) line is detected in most sources with a peak flux of 0.3-1 Jy. The S(0) line is definitely seen in 2 objects: GG Tau and HD 163296. The observations suggest the presence of "warm" gas at T_(kin) ≈ 100 K with a mass of a few % of the total gas+ dust mass, derived assuming a gas-to-dust ratio of 100:1. The S(1) peak flux does not show a strong correlation with spectral type of the central star or continuum flux at 1.3 millimeter. Possible origins for the warm gas seen in H_2 are discussed, and comparisons with model calculations are made.

Item Type:Book Section
Additional Information:© 1999 ESA Publications Division.
Subject Keywords:molecular hydrogen; Herbig Ae stars; T Tauri stars; circumstellar disks
Record Number:CaltechAUTHORS:20121002-151349410
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:34642
Deposited By: Tony Diaz
Deposited On:03 Oct 2012 15:34
Last Modified:27 Dec 2012 02:48

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