A Spitzer c2d Legacy Survey To Identify And Characterize Disks With Inner Dust Holes

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dc.contributor.utaustinauthorEvans, Neal J.en_US
dc.contributor.utaustinauthorHarvey, Paul M.en_US
dc.creatorMerin, Brunoen_US
dc.creatorBrown, Joanna M.en_US
dc.creatorOliveira, Isaen_US
dc.creatorHerczeg, Gregory J.en_US
dc.creatorvan Dishoeck, Ewine F.en_US
dc.creatorBottinelli, Sandrineen_US
dc.creatorEvans, Neal J.en_US
dc.creatorCieza, Lucasen_US
dc.creatorSpezzi, Loredanaen_US
dc.creatorAlcala, Juan M.en_US
dc.creatorHarvey, Paul M.en_US
dc.creatorBlake, Geoffrey A.en_US
dc.creatorBayo, Ameliaen_US
dc.creatorGeers, Vincent G.en_US
dc.creatorLahuis, Freden_US
dc.creatorPrusti, Timoen_US
dc.creatorAugereau, Jean-Charlesen_US
dc.creatorOlofsson, Johanen_US
dc.creatorWalter, Frederick M.en_US
dc.creatorChiu, Kuenleyen_US
dc.date.accessioned2016-04-28T19:31:30Z
dc.date.available2016-04-28T19:31:30Z
dc.date.issued2010-08en
dc.description.abstractUnderstanding how disks dissipate is essential to studies of planet formation. However, identifying exactly how dust and gas dissipate is complicated due to the difficulty of finding objects that are clearly in the transition phase of losing their surrounding material. We use Spitzer Infrared Spectrograph (IRS) spectra to examine 35 photometrically selected candidate cold disks (disks with large inner dust holes). The infrared spectra are supplemented with optical spectra to determine stellar and accretion properties and 1.3 mm photometry to measure disk masses. Based on detailed spectral energy distribution modeling, we identify 15 new cold disks. The remaining 20 objects have IRS spectra that are consistent with disks without holes, disks that are observed close to edge-on, or stars with background emission. Based on these results, we determine reliable criteria to identify disks with inner holes from Spitzer photometry, and examine criteria already in the literature. Applying these criteria to the c2d surveyed star-forming regions gives a frequency of such objects of at least 4% and most likely of order 12% of the young stellar object population identified by Spitzer. We also examine the properties of these new cold disks in combination with cold disks from the literature. Hole sizes in this sample are generally smaller than in previously discovered disks and reflect a distribution in better agreement with exoplanet orbit radii. We find correlations between hole size and both disk and stellar masses. Silicate features, including crystalline features, are present in the overwhelming majority of the sample, although the 10 mu m feature strength above the continuum declines for holes with radii larger than similar to 7 AU. In contrast, polycyclic aromatic hydrocarbons are only detected in 2 out of 15 sources. Only a quarter of the cold disk sample shows no signs of accretion, making it unlikely that photoevaporation is the dominant hole-forming process in most cases.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipNASA 1224608, 1288664, 1256316, 1230780en_US
dc.description.sponsorshipNWO Spinozaen_US
dc.description.sponsorshipNOVAen_US
dc.description.sponsorshipEuropean Research Training Network HPRN-CT-2002-00308en_US
dc.identifierdoi:10.15781/T2GN67
dc.identifier.Filename2010_08_spitzer.pdfen_US
dc.identifier.citationMer�n, Bruno, Joanna M. Brown, Isa Oliveira, Gregory J. Herczeg, Ewine F. Van Dishoeck, Sandrine Bottinelli, Neal J. Evans II et al. "A Spitzer c2d legacy survey to identify and characterize disks with inner dust holes." The Astrophysical Journal, Vol. 718, No. 2 (Aug., 2010): 1200.en_US
dc.identifier.doi10.1088/0004-637x/718/2/1200en_US
dc.identifier.issn0004-637Xen_US
dc.identifier.urihttp://hdl.handle.net/2152/34637
dc.language.isoEnglishen_US
dc.relation.ispartofen_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.rights.restrictionOpenen_US
dc.subjectplanetary systemsen_US
dc.subjectprotoplanetary disksen_US
dc.subjectstars: pre-main sequenceen_US
dc.subjectt-tauri starsen_US
dc.subjectmain-sequence starsen_US
dc.subjectyoung stellar objectsen_US
dc.subjectspectralen_US
dc.subjectenergy-distributionsen_US
dc.subjectherbig ae/be starsen_US
dc.subjectlow-mass starsen_US
dc.subjectscorpius oben_US
dc.subjectassociationen_US
dc.subjecth-alpha-emissionen_US
dc.subjectcircumstellar disksen_US
dc.subjectprotoplanetary disksen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleA Spitzer c2d Legacy Survey To Identify And Characterize Disks With Inner Dust Holesen_US
dc.typeArticleen_US

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