Theoretical HDO emission from low-mass protostellar envelopes

Parise, Berengere, Ceccarelli, C and Maret, S 2005. Theoretical HDO emission from low-mass protostellar envelopes. Astronomy and Astrophysics 441 (1) , pp. 171-179. 10.1051/0004-6361:20053081

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Abstract

We present theoretical predictions of the rotational line emission of deuterated water in low-mass protostar collapsing envelopes. The model accounts for the density and temperature structure of the envelope, according to the inside-out collapse framework. The deuterated water abundance profile is approximated by a step function, with a low value in the cold outer envelope and a higher value in the inner envelope where the grain mantles evaporate. The two abundances are the two main parameters of the modeling, along with the temperature at which the mantles evaporate. We report line flux predictions for a 30 and 5 $L_\odot$ source luminosity respectively. We show that ground-based observations are capable of constraining the three parameters of the model in the case of bright low-mass protostars (L>10 $L_\odot$), and that no space-based observations, such as HSO observations, are required in this case. On the contrary, we show that the study of low-luminosity sources ( $L<10~ L_{\odot}$), assuming the same HDO abundance profile, requires too much integration time to be carried out either with available ground-based telescopes or with the HIFI instrument on board HSO. For these sources, only the large interferometer ALMA will allow one to constrain the HDO abundance.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Uncontrolled Keywords:	ISM: abundances; ISM: molecules; stars: formation
Additional Information:	Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/0004-6361/ (accessed 17/04/2014)
Publisher:	EDP Sciences
ISSN:	0004-6361
Date of First Compliant Deposit:	30 March 2016
Last Modified:	26 May 2023 13:04
URI:	https://orca.cardiff.ac.uk/id/eprint/52822

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