Walsh, C orcid.org/0000-0001-6078-786X, Juhasz, A, Meeus, G et al. (5 more authors) (2016) ALMA Reveals the Anatomy of the mm-sized Dust and Molecular Gas in the HD 97048 Disk. Astrophysical Journal, 831 (2). 200. ISSN 0004-637X
Abstract
Transitional disks show a lack of excess emission at infrared wavelengths due to a large dust cavity, that is often corroborated by spatially resolved observations at ∼mm wavelengths. We present the first spatially resolved ∼ mm-wavelength images of the disk around the Herbig Ae/Be star, HD 97048. Scattered light images show that the disk extends to ≈640 au. ALMA data reveal a circular-symmetric dusty disk extending to ≈350 au, and a molecular disk traced in CO J = 3-2 emission, extending to ≈750 au. The CO emission arises from a flared layer with an opening angle ≈30°–40°. HD 97048 is another source for which the large (∼ mm-sized) dust grains are more centrally concentrated than the small (∼μm-sized) grains and molecular gas, likely due to radial drift. The images and visibility data modeling suggest a decrement in continuum emission within ≈50 au, consistent with the cavity size determined from mid-infrared imaging (34 ± 4 au). The extracted continuum intensity profiles show ring-like structures with peaks at ≈50, 150, and 300 au, with associated gaps at ≈100 and 250 au. This structure should be confirmed in higher-resolution images (FWHM ≈ 10–20 au). These data confirm the classification of HD 97048 as a transitional disk that also possesses multiple ring-like structures in the dust continuum emission. Additional data are required at multiple and well-separated frequencies to fully characterize the disk structure, and thereby constrain the mechanism(s) responsible for sculpting the HD 97048 disk.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | (c) 2016, The American Astronomical Society. All rights reserved. This is an author produced version of an article published in The Astrophysical Journal. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | Protoplanetary disks; Stars: individual: HD 97048; Stars: pre-main sequence; Submillimeter: planetary systems |
Dates: |
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Institution: | The University of Leeds |
Academic Units: | The University of Leeds > Faculty of Engineering & Physical Sciences (Leeds) > School of Physics and Astronomy (Leeds) > Astrophysics (Leeds) |
Depositing User: | Symplectic Publications |
Date Deposited: | 16 Nov 2016 15:07 |
Last Modified: | 18 Jan 2018 23:06 |
Published Version: | https://doi.org/10.3847/0004-637X/831/2/200 |
Status: | Published |
Publisher: | American Astronomical Society |
Identification Number: | 10.3847/0004-637X/831/2/200 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:107473 |