Multiple Rings of Millimeter Dust Emission in the HD 15115 Debris Disk

MacGregor, Meredith A. and Weinberger, Alycia J. and Nesvold, Erika R. and Hughes, A. Meredith and Wilner, D. J. and Currie, Thayne and Debes, John H. and Donaldson, Jessica K. and Redfield, Seth and Roberge, Aki and Schneider, Glenn (2019) Multiple Rings of Millimeter Dust Emission in the HD 15115 Debris Disk. The Astrophysical Journal, 877 (2). L32. ISSN 2041-8213

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We 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 (0farcs6 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 (0farcs89 ± 0farcs12) and 92.2 ± 2.4 au (1farcs88 ± 0farcs49), respectively, with a gap located at 58.9 ± 4.5 au (1farcs2 ± 0farcs10) with a fractional depth of 0.88 ± 0.10 and a width of 13.8 ± 5.6 au (0farcs28 ± 0farcs11). 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 MJup.

Item Type: Article
Subjects: Asian Repository > General Subject > Physics and Astronomy
0 Subject > Physics and Astronomy
Depositing User: Managing Editor
Date Deposited: 06 Jun 2023 09:50
Last Modified: 06 Jun 2023 09:50

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