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Ice absorption features in the 5-8 μm region toward embedded protostars

Keane, J. V. and Tielens, A. G. G. M. and Boogert, A. C. A. and Schutte, W. A. and Whittet, D. C. B. (2001) Ice absorption features in the 5-8 μm region toward embedded protostars. Astronomy and Astrophysics, 376 (1). pp. 254-270. ISSN 0004-6361. doi:10.1051/0004-6361:20010936.

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We have obtained 5-8 μm spectra towards 10 embedded protostars using the Short Wavelength Spectrometer on board the Infrared Space Observatory (ISO-SWS) with the aim of studying the composition of interstellar ices. The spectra are dominated by absorption bands at 6.0 μm and 6.85 μm. The observed peak positions, widths and relative intensities of these bands vary dramatically along the different lines of sight. On the basis of comparison with laboratory spectra, the bulk of the 6.0 μm absorption band is assigned to amorphous H_2O ice. Additional absorption, in this band, is seen toward 5 sources on the short wavelength wing, near 5.8 μm, and the long wavelength side near 6.2 μm. We attribute the short wavelength absorption to a combination of formic acid (HCOOH) and formaldehyde (H_2CO), while the long wavelength absorption has been assigned to the C-C stretching mode of aromatic structures. From an analysis of the 6.85 μm band, we conclude that this band is composed of two components: a volatile component centered near 6.75 μm and a more refractory component at 6.95 μm. From a comparison with various temperature tracers of the thermal history of interstellar ices, we conclude that the two 6.85 μm components are related through thermal processing. We explore several possible carriers of the 6.85 absorption band, but no satisfactory identification can be made at present. Finally, we discuss the possible implications for the origin and evolution of interstellar ices that arise from these new results.

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Additional Information:© ESO, 2001. Received 23 December 1999 / Accepted 27 June 2001. D. C. B. Whittet is funded by NASA through JPL contract No. 961624 and by NASA Exobiology and Long-Term Space Astrophysics programs (grants NAG5-7598 and NAG5-7884, respectively). Based on observations with ISO, an ESA project with instruments funded by ESA Member States (especially the PI countries: France, Germany, The Netherlands and the UK) and with the participation of ISAS and NASA.
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Subject Keywords:ISM: dust, extinction / ISM: molecules / ISM: abundances / infrared: ISM / stars: formation
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Record Number:CaltechAUTHORS:20170408-160037359
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Official Citation:Ice absorption features in the 5-8 μm region toward embedded protostars J. V. Keane, A. G. G. M. Tielens, A. C. A. Boogert, W. A. Schutte and D. C. B. Whittet A&A, 376 1 (2001) 254-270 DOI:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76110
Deposited By: 1Science Import
Deposited On:13 Jun 2017 19:50
Last Modified:15 Nov 2021 16:57

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