The c2d Spitzer Spectroscopic Survey Of Ices Around Low-Mass Young Stellar Objects. I. H2O And The 5-8 Mu M Bands

dc.contributor.utaustinauthorEvans, Neal J.en_US
dc.contributor.utaustinauthorHarvey, Paul M.en_US
dc.contributor.utaustinauthorKessler-Silacci, J.en_US
dc.creatorBoogert, Adwin C. A.en_US
dc.creatorPontoppidan, Klaus M.en_US
dc.creatorKnez, Claudiaen_US
dc.creatorLahuis, Freden_US
dc.creatorKessler-Silacci, J.en_US
dc.creatorvan Dishoeck, Ewine F.en_US
dc.creatorBlake, Geoffrey A.en_US
dc.creatorAugereau, Jean-Charlesen_US
dc.creatorBisschop, S. E.en_US
dc.creatorBottinelli, Sandrineen_US
dc.creatorBrooke, Tyler Y.en_US
dc.creatorBrown, Justinen_US
dc.creatorCrapsi, Antonioen_US
dc.creatorEvans, Neal J.en_US
dc.creatorFraser, Helen J.en_US
dc.creatorGeers, V.en_US
dc.creatorHuard, Tracy L.en_US
dc.creatorJorgensen, Jes K.en_US
dc.creatorOberg, Karin I.en_US
dc.creatorAllen, Lori E.en_US
dc.creatorHarvey, Paul M.en_US
dc.creatorKoerner, David W.en_US
dc.creatorMundy, Lee G.en_US
dc.creatorPadgett, Deborah L.en_US
dc.creatorSargent, Anneila I.en_US
dc.creatorStapelfeldt, Karl R.en_US
dc.description.abstractTo study the physical and chemical evolution of ices in solar-mass systems, a spectral survey is conducted of a sample of 41 low-luminosity YSOs (L similar to 0.1-10 L-circle dot) using 3-38 mu m Spitzer and ground-based spectra. The sample is complemented with previously published Spitzer spectra of background stars and with ISO spectra of well-studied massive YSOs (L similar to 10(5) L-circle dot). The long-known 6.0 and 6.85 mu m bands are detected toward all sources, with the Class 0-type YSOs showing the deepest bands ever observed. The 6.0 mu m band is often deeper than expected from the bending mode of pure solid H2O. The additional 5-7 mu m absorption consists of five independent components, which, by comparison to laboratory studies, must be from at least eight different carriers. Much of this absorption is due to simple species likely formed by grain surface chemistry, at abundances of 1%-30% for CH3OH, 3%-8% for NH3, 1%-5% for HCOOH, similar to 6% for H2CO, and similar to 0.3% for HCOO- relative to solid H2O. The 6.85 mu m band has one or two carriers, of which one may be less volatile than H2O. Its carrier(s) formed early in the molecular cloud evolution and do not survive in the diffuse ISM. If an NH4+- containing salt is the carrier, its abundance relative to solid H2O is similar to 7%, demonstrating the efficiency of low-temperature acid-base chemistry or cosmic-ray-induced reactions. Possible origins are discussed for enigmatic, very broad absorption between 5 and 8 mu m. Finally, the same ices are observed toward massive and low-mass YSOs, indicating that processing by internal UV radiation fields is a minor factor in their early chemical evolution.en_US
dc.description.sponsorshipNWO Spinozaen_US
dc.description.sponsorshipEuropean Research Training Network PLANETS HPRN-CT-2002-00308en_US
dc.description.sponsorshipNASA Origins NAG5-13050en_US
dc.description.sponsorshipNASA Hubble Fellowship 01201.01en_US
dc.description.sponsorshipNASA NAS 5-26555en_US
dc.identifier.citationBoogert, A. C. A., K. M. Pontoppidan, C. Knez, F. Lahuis, J. Kessler-Silacci, E. F. Van Dishoeck, G. A. Blake et al. "The c2d Spitzer Spectroscopic Survey of Ices around Low-Mass Young Stellar Objects. I. H2O and the 5-8 ?m Bands." The Astrophysical Journal, Vol. 678, No. 2 (May., 2008): 985.en_US
dc.relation.ispartofserialAstrophysical Journalen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.subjectinfrared : ismen_US
dc.subjectinfrared : starsen_US
dc.subjectism : abundancesen_US
dc.subject: moleculesen_US
dc.subjectstars : formationen_US
dc.subjectinfrared spectrograph irsen_US
dc.subjectiso-sws observationsen_US
dc.subjectmu-m spectrumen_US
dc.subjectinterstellar iceen_US
dc.subjectembedded protostarsen_US
dc.subjectsolid methanolen_US
dc.subjectmicron spectraen_US
dc.subjectgrain mantlesen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleThe c2d Spitzer Spectroscopic Survey Of Ices Around Low-Mass Young Stellar Objects. I. H2O And The 5-8 Mu M Bandsen_US
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