Herschel Observations of the T Cha Transition Disk: Constraining the Outer Disk Properties

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dc.contributor.utaustinauthorHarvey, Paul M.en_US
dc.contributor.utaustinauthorEvans, Neal J., IIen_US
dc.creatorCieza, Lucas A.en_US
dc.creatorOlofsson, Johanen_US
dc.creatorHarvey, Paul M.en_US
dc.creatorPinte, Christopheen_US
dc.creatorMerin, Brunoen_US
dc.creatorAugereau, Jean-Charlesen_US
dc.creatorEvans, Neal J., IIen_US
dc.creatorNajita, Joanen_US
dc.creatorHenning, Thomasen_US
dc.creatorMenard, Francoisen_US
dc.date.accessioned2016-10-28T19:38:41Z
dc.date.available2016-10-28T19:38:41Z
dc.date.issued2011-11en_US
dc.description.abstractT Cha is a nearby (d similar to 100 pc) transition disk known to have an optically thin gap separating optically thick inner and outer disk components. Huelamo et al. recently reported the presence of a low-mass object candidate within the gap of the T Cha disk, giving credence to the suspected planetary origin of this gap. Here we present the Herschel photometry (70, 160, 250, 350, and 500 mu m) of T Cha from the "Dust, Ice, and Gas in Time" Key Program, which bridges the wavelength range between existing Spitzer and millimeter data and provide important constraints on the outer disk properties of this extraordinary system. We model the entire optical to millimeter wavelength spectral energy distribution (SED) of T Cha (19 data points between 0.36 and 3300 mu m without any major gaps in wavelength coverage). T Cha shows a steep spectral slope in the far-IR, which we find clearly favors models with outer disks containing little or no dust beyond similar to 40 AU. The full SED can be modeled equally well with either an outer disk that is very compact (only a few AU wide) or a much larger one that has a very steep surface density profile. That is, T Cha's outer disk seems to be either very small or very tenuous. Both scenarios suggest a highly unusual outer disk and have important but different implications for the nature of T Cha. Spatially resolved images are needed to distinguish between the two scenarios.en_US
dc.description.departmentAstronomyen_US
dc.description.sponsorshipDIGIT Herschel Open Time Key Programen_US
dc.description.sponsorshipNASAen_US
dc.description.sponsorshipAlexander von Humboldt Foundationen_US
dc.description.sponsorshipEuropean Commissionen_US
dc.description.sponsorshipAgence Nationale pour la Recherche of France PERG06-GA-2009-256513, ANR-07-BLAN-0221, ANR-2010-JCJC-0504-01en_US
dc.description.sponsorshipCNRS/INSU, Franceen_US
dc.identifierdoi:10.15781/T2M902576
dc.identifier.citationCieza, Lucas A., Johan Olofsson, Paul M. Harvey, Christophe Pinte, Bruno Merín, Jean-Charles Augereau, Neal J. Evans II, Joan Najita, Thomas Henning, and Francois Ménard. "Herschel Observations of the T Cha Transition Disk: Constraining the Outer Disk Properties." The Astrophysical Journal Letters, Vol. 741, No. 2 (Nov., 2011): L25.en_US
dc.identifier.doi10.1088/2041-8205/741/2/l25en_US
dc.identifier.issn2041-8205en_US
dc.identifier.urihttp://hdl.handle.net/2152/43125
dc.language.isoEnglishen_US
dc.relation.ispartofen_US
dc.relation.ispartofserialAstrophysical Journal Lettersen_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.subjectplanet-disk interactionsen_US
dc.subjectprotoplanetary disksen_US
dc.subjectstars: individual (t cha)en_US
dc.subjectsubmillimeter: planetary systemsen_US
dc.subjectprotoplanetary disksen_US
dc.subjectradiative-transferen_US
dc.subjectstarsen_US
dc.subjectgapsen_US
dc.subjectchamaeleontisen_US
dc.subjectevolutionen_US
dc.subjectsystemen_US
dc.subjectgrainsen_US
dc.subjectyoungen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleHerschel Observations of the T Cha Transition Disk: Constraining the Outer Disk Propertiesen_US
dc.typeArticleen_US

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