CO and Dust Properties in the TW Hya Disk from High-resolution ALMA Observations

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dc.citation.articleNumber122en_US
dc.citation.issueNumber2en_US
dc.citation.journalTitleThe Astrophysical Journalen_US
dc.citation.volumeNumber852en_US
dc.contributor.authorHuang, Janeen_US
dc.contributor.authorAndrews, Sean M.en_US
dc.contributor.authorCleeves, L. Ilsedoreen_US
dc.contributor.authorÖberg, Karin I.en_US
dc.contributor.authorWilner, David J.en_US
dc.contributor.authorBai, Xueningen_US
dc.contributor.authorBirnstiel, Tilen_US
dc.contributor.authorCarpenter, Johnen_US
dc.contributor.authorHughes, A. Meredithen_US
dc.contributor.authorIsella, Andreaen_US
dc.contributor.authorPérez, Laura M.en_US
dc.contributor.authorRicci, Lucaen_US
dc.contributor.authorZhu, Zhaohuanen_US
dc.date.accessioned2018-02-26T17:22:09Zen_US
dc.date.available2018-02-26T17:22:09Zen_US
dc.date.issued2018en_US
dc.description.abstractWe analyze high angular resolution ALMA observations of the TW Hya disk to place constraints on the CO and dust properties. We present new, sensitive observations of the 12CO J = 3 − 2 line at a spatial resolution of 8 au (0farcs14). The CO emission exhibits a bright inner core, a shoulder at r ≈ 70 au, and a prominent break in slope at r ≈ 90 au. Radiative transfer modeling is used to demonstrate that the emission morphology can be reasonably reproduced with a 12CO column density profile featuring a steep decrease at r ≈ 15 au and a secondary bump peaking at r ≈ 70 au. Similar features have been identified in observations of rarer CO isotopologues, which trace heights closer to the midplane. Substructure in the underlying gas distribution or radially varying CO depletion that affects much of the disk's vertical extent may explain the shared emission features of the main CO isotopologues. We also combine archival 1.3 mm and 870 μm continuum observations to produce a spectral index map at a spatial resolution of 2 au. The spectral index rises sharply at the continuum emission gaps at radii of 25, 41, and 47 au. This behavior suggests that the grains within the gaps are no larger than a few millimeters. Outside the continuum gaps, the low spectral index values of α ≈ 2 indicate either that grains up to centimeter size are present or that the bright continuum rings are marginally optically thick at millimeter wavelengths.en_US
dc.identifier.citationHuang, Jane, Andrews, Sean M., Cleeves, L. Ilsedore, et al.. "CO and Dust Properties in the TW Hya Disk from High-resolution ALMA Observations." <i>The Astrophysical Journal,</i> 852, no. 2 (2018) IOP Publishing: https://doi.org/10.3847/1538-4357/aaa1e7.en_US
dc.identifier.digitalCO-Dust-Propertiesen_US
dc.identifier.doihttps://doi.org/10.3847/1538-4357/aaa1e7en_US
dc.identifier.urihttps://hdl.handle.net/1911/99288en_US
dc.language.isoengen_US
dc.publisherIOP Publishingen_US
dc.rightsArticle is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.en_US
dc.titleCO and Dust Properties in the TW Hya Disk from High-resolution ALMA Observationsen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpublisher versionen_US
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