Spitzer Infrared Spectrograph Survey of Young Stars in the Chamaeleon I Star-forming Region

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dc.contributor.utaustinauthorGreen, Joel D.en_US
dc.creatorManoj, P.en_US
dc.creatorKim, K. H.en_US
dc.creatorFurlan, E.en_US
dc.creatorMcClure, M. K.en_US
dc.creatorLuhman, K. L.en_US
dc.creatorWatson, D. M.en_US
dc.creatorEspaillat, C.en_US
dc.creatorCalvet, N.en_US
dc.creatorNajita, J. R.en_US
dc.creatorD'Alessio, P.en_US
dc.creatorAdame, L.en_US
dc.creatorSargent, B. A.en_US
dc.creatorForrest, W. J.en_US
dc.creatorBohac, C.en_US
dc.creatorGreen, Joel D.en_US
dc.creatorArnold, L. A.en_US
dc.date.accessioned2016-10-28T19:36:30Z
dc.date.available2016-10-28T19:36:30Z
dc.date.issued2011-03en_US
dc.description.abstractWe present 5-36 mu m mid-infrared spectra of 82 young stars in the similar to 2 Myr old Chamaeleon I star-forming region, obtained with the Spitzer Infrared Spectrograph (IRS). We have classified these objects into various evolutionary classes based on their spectral energy distributions and the spectral features seen in the IRS spectra. We have analyzed the mid-IR spectra of Class II objects in Chamaeleon I in detail, in order to study the vertical and radial structure of the protoplanetary disks surrounding these stars. We find evidence for substantial dust settling in most protoplanetary disks in Chamaeleon I. We have identified several disks with altered radial structures in Chamaeleon I, among them transitional disk candidates which have holes or gaps in their disks. Analysis of the silicate emission features in the IRS spectra of Class II objects in Cha I shows that the dust grains in these disks have undergone significant processing (grain growth and crystallization). However, disks with radial holes/gaps appear to have relatively unprocessed grains. We further find the crystalline dust content in the inner (less than or similar to 1-2 AU) and the intermediate (less than or similar to 10 AU) regions of the protoplanetary disks to be tightly correlated. We also investigate the effects of accretion and stellar multiplicity on the disk structure and dust properties. Finally, we compare the observed properties of protoplanetary disks in Cha I with those in slightly younger Taurus and Ophiuchus regions and discuss the effects of disk evolution in the first 1-2 Myr.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipNASA 1407, 1257184en_US
dc.description.sponsorshipJPL/Caltech, JPL 960803en_US
dc.description.sponsorshipCornell 31419-5714en_US
dc.description.sponsorshipNational Science Foundation AST-0544588, 0901947en_US
dc.description.sponsorshipPennsylvania State Universityen_US
dc.description.sponsorshipEberly College of Scienceen_US
dc.description.sponsorshipPennsylvania Space Grant Consortiumen_US
dc.description.sponsorshipPAPIIT-UNAM, Mexicoen_US
dc.identifierdoi:10.15781/T2X63B78S
dc.identifier.citationManoj, P., K. H. Kim, E. Furlan, M. K. McClure, K. L. Luhman, Dan M. Watson, C. Espaillat et al. "Spitzer Infrared Spectrograph survey of young stars in the Chamaeleon I star-forming region." The Astrophysical Journal Supplement Series, Vol. 193, No. 1 (Mar., 2011): 11.en_US
dc.identifier.doi10.1088/0067-0049/193/1/11en_US
dc.identifier.issn0067-0049en_US
dc.identifier.urihttp://hdl.handle.net/2152/43022
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journal Supplement Seriesen_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.rights.restrictionOpenen_US
dc.subjectcircumstellar matteren_US
dc.subjectinfrared: starsen_US
dc.subjectprotoplanetary disksen_US
dc.subjectstars:en_US
dc.subjectpre-main sequenceen_US
dc.subjectt-tauri starsen_US
dc.subjectmain-sequence starsen_US
dc.subjectlow-mass starsen_US
dc.subjectspectralen_US
dc.subjectenergy-distributionsen_US
dc.subjectnearby molecular cloudsen_US
dc.subjectherbig ae/be systemsen_US
dc.subjectbrown dwarf disksen_US
dc.subjectall-sky surveyen_US
dc.subjectprotoplanetary disksen_US
dc.subjectgrain-growthen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleSpitzer Infrared Spectrograph Survey of Young Stars in the Chamaeleon I Star-forming Regionen_US
dc.typeArticleen_US

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