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dc.contributor.authorMacGregor, Meredith A.
dc.contributor.authorWeinberger, Alycia J.
dc.contributor.authorNesvold, Erika R.
dc.contributor.authorHughes, A. Meredith
dc.contributor.authorWilner, D. J.
dc.contributor.authorCurrie, Thayne
dc.contributor.authorDebes, John H.
dc.contributor.authorDonaldson, Jessica K.
dc.contributor.authorRedfield, Seth
dc.contributor.authorRoberge, Aki
dc.contributor.authorSchneider, Glenn
dc.date.accessioned2019-10-02T22:51:25Z
dc.date.available2019-10-02T22:51:25Z
dc.date.issued2019-05-31
dc.identifier.citationMeredith A. MacGregor et al 2019 ApJL 877 L32en_US
dc.identifier.issn2041-8205
dc.identifier.doi10.3847/2041-8213/ab21c2
dc.identifier.urihttp://hdl.handle.net/10150/634662
dc.description.abstractWe present observations of the HD 15115 debris disk from the Atacama Large Millimeter/submillimeter Array (ALMA) at 1.3 mm that capture this intriguing system with the highest resolution (0 ''.6 or 29 au) at millimeter wavelengths to date. This new ALMA image shows evidence for two rings in the disk separated by a cleared gap. By fitting models directly to the observed visibilities within a Markov Chain Monte Carlo framework, we are able to characterize the millimeter continuum emission and place robust constraints on the disk structure and geometry. In the best-fit model of a power-law disk with a Gaussian gap, the disk inner and outer edges are at 43.9 +/- 5.8 au (0 ''.89 +/- 0 ''.12) and 92.2 +/- 2.4 au (1 ''.88 +/- 0 ''.49), respectively, with a gap located at 58.9 +/- 4.5 au (1 ''.2 +/- 0 ''.10) with a fractional depth of 0.88 +/- 0.10 and a width of 13.8 +/- 5.6 au (0 ''.28 +/- 0 ''.11). Because we do not see any evidence at millimeter wavelengths for the dramatic east-west asymmetry seen in scattered light, we conclude that this feature most likely results from a mechanism that only affects small grains. Using dynamical modeling and our constraints on the gap properties, we are able to estimate a mass for the possible planet sculpting the gap to be 0.16 +/- 0.06 M-Jup.en_US
dc.description.sponsorshipNational Science Foundation Astronomy and Astrophysics Postdoctoral Fellowship [AST-1701406]; NSF [AST-1412647, AST-1313268]en_US
dc.language.isoenen_US
dc.publisherIOP PUBLISHING LTDen_US
dc.rightsCopyright © 2019. The American Astronomical Society. All rights reserved.en_US
dc.subjectcircumstellar matteren_US
dc.subjectstars: individual (HD 15115)en_US
dc.subjectsubmillimeter: planetary systemsen_US
dc.titleMultiple Rings of Millimeter Dust Emission in the HD 15115 Debris Disken_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Steward Observen_US
dc.identifier.journalASTROPHYSICAL JOURNAL LETTERSen_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal published versionen_US
dc.source.volume877
dc.source.issue2
dc.source.beginpageL32
refterms.dateFOA2019-10-02T22:51:25Z


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