Spitzer space telescope spectroscopy of ices toward low-mass embedded protostars

A. C.Adwin Boogert, Klaus M. Pontoppidan, Fred Lahuis, Jes K. Jørgensen, Jean Charles Augereau, Geoffrey A. Blake, Timothy Y. Brooke, Joanna Brown, C. P. Dullemond, Neal J. Evans, Vincent Geers, Michiel R. Hogerheijde, Jacqueline Kessler-Silacci, Claudia Knez, Pat Morris, Alberto Noriega-Crespo, Fredrik L. Schöier, Ewine F. Van Dishoeck, Lori E. Allen, Paul M. HarveyDavid W. Koerner, Lee G. Mundy, Philip C. Myers, Deborah L. Padgett, Anneila I. Sargent, Karl R. Stapelfeldt

Research output: Contribution to journalArticle

98 Scopus citations

Abstract

Sensitive 5-38 μm Spitzer Space Telescope and ground-based 3-5 μm spectra of the embedded low-mass protostars B5 IRS1 and HH 46 IRS show deep ice absorption bands superposed on steeply rising mid-infrared continua. The ices likely originate in the circumstellar envelopes. The CO2 bending mode at 15 μm is a particularly powerful tracer of the ice composition and processing history. Toward these protostars, this band shows little evidence for thermal processing at temperatures above 50 K. Signatures of lower temperature processing are present in the CO and OCN- bands, however. The observed CO2 profile indicates an intimate mixture with H 2O, but not necessarily with CH3OH, in contrast to some high-mass protostars. This is consistent with the low CH3OH abundance derived from the ground-based L-band spectra. The CO2:H2O column density ratios are high in both B5 IRS1 and HH 46 IRS (∼35%). Clearly, the Spitzer spectra are essential for studying ice evolution in low-mass protostellar environments and for eventually determining the relation between interstellar and solar system ices.

Original languageEnglish (US)
Pages (from-to)359-362
Number of pages4
JournalAstrophysical Journal, Supplement Series
Volume154
Issue number1
DOIs
StatePublished - Sep 1 2004

Keywords

  • Astrochemistry
  • ISM: abundances
  • ISM: molecules
  • Infrared: ISM
  • Stars: formation
  • Stars: individual (B5 IRS 1)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Boogert, A. C. A., Pontoppidan, K. M., Lahuis, F., Jørgensen, J. K., Augereau, J. C., Blake, G. A., Brooke, T. Y., Brown, J., Dullemond, C. P., Evans, N. J., Geers, V., Hogerheijde, M. R., Kessler-Silacci, J., Knez, C., Morris, P., Noriega-Crespo, A., Schöier, F. L., Van Dishoeck, E. F., Allen, L. E., ... Stapelfeldt, K. R. (2004). Spitzer space telescope spectroscopy of ices toward low-mass embedded protostars. Astrophysical Journal, Supplement Series, 154(1), 359-362. https://doi.org/10.1086/422556