An Unusual Reservoir of Water Emission in the VV CrA A Protoplanetary Disk
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Salyk, C.
Pontoppidan, K.M.
Banzatti, A.
Käufl, U.
Hall, C.
Pascucci, I.
Carmona, A.
Blake, G.A.
Alexander, R.
Kamp, I.
Affiliation
Lunar and Planetary Laboratory, University of ArizonaIssue Date
2022
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American Astronomical SocietyCitation
Salyk, C., Pontoppidan, K. M., Banzatti, A., Käufl, U., Hall, C., Pascucci, I., Carmona, A., Blake, G. A., Alexander, R., & Kamp, I. (2022). An Unusual Reservoir of Water Emission in the VV CrA A Protoplanetary Disk. Astronomical Journal, 164(4).Journal
Astronomical JournalRights
Copyright © 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.Collection Information
This 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.Abstract
We present an analysis of an unusual pattern of water vapor emission from the ∼2 Myr old low-mass binary system VV CrA, as observed in IR spectra obtained with VLT-CRIRES, VLT-VISIR, and Spitzer-IRS. Each component of the binary shows emission from water vapor in both the L (∼3 μm) and N (∼12 μm) bands. The N-band and Spitzer spectra are similar to those previously observed from young stars with disks and are consistent with emission from an extended protoplanetary disk. Conversely, the CRIRES L-band data of VV CrA A show an unusual spectrum, which requires the presence of a water reservoir with high temperature (T ≳ 1500 K), column density (N H2O ∼ 3 × 1020 cm−2), and turbulent broadening (v ∼ 10 km s−1) but very small emitting area (A ≲ 0.005 au2). Similarity to previously observed water emission from V1331 Cyg and SVS 13 suggests that the presence of such a reservoir may be linked to evolutionary state, perhaps related to the presence of high accretion rates or winds. While the inner disk may harbor such a reservoir, simple Keplerian models do not match well with emitting line shapes, and alternative velocity fields must be considered. We also present a new idea, that the unusual emission could arise in a circumplanetary disk, embedded within the larger VV CrA A protoplanetary disk. Additional data are likely required to determine the true physical origin of this unusual spectral pattern. © 2022. The Author(s). Published by the American Astronomical Society.Note
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0004-6256Version
Final published versionae974a485f413a2113503eed53cd6c53
10.3847/1538-3881/ac8878
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Except where otherwise noted, this item's license is described as Copyright © 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence.