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An Unusual Reservoir of Water Emission in the VV CrA A Protoplanetary Disk

Salyk, Colette and Pontoppidan, Klaus M. and Banzatti, Andrea and Käufl, Ulrich and Hall, Cassandra and Pascucci, Ilaria and Carmona, Andrés and Blake, Geoffrey A. and Alexander, Richard and Kamp, Inga (2022) An Unusual Reservoir of Water Emission in the VV CrA A Protoplanetary Disk. Astronomical Journal, 164 (4). p. 136. ISSN 0004-6256. doi:10.3847/1538-3881/ac8878.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription
Salyk, Colette0000-0003-3682-6632
Pontoppidan, Klaus M.0000-0001-7552-1562
Banzatti, Andrea0000-0003-4335-0900
Käufl, Ulrich0000-0002-8806-9795
Hall, Cassandra0000-0002-8138-0425
Pascucci, Ilaria0000-0001-7962-1683
Carmona, Andrés0000-0003-2471-1299
Blake, Geoffrey A.0000-0003-0787-1610
Alexander, Richard0000-0001-6410-2899
Kamp, Inga0000-0001-7455-5349
Additional Information:C.S. would like to thank all who assisted with the planning and observations in the VISIR large program, including the support staff at the VLT. C.S. would also like to acknowledge helpful comments on this work from Michael R. Meyer and Greg Doppmann. C.H. is a former Winton Fellow, and this research has been supported by Winton Philanthropies / The David and Claudia Harding Foundation. C.H. received funding from the European Union's Horizon 2020 research and innovation program under the Marie Sklodowska-Curie grant agreement No. 823823 (RISE DUSTBUSTERS project). C.H. and R.A. acknowledge support from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (grant agreement No. 681601). A.C. acknowledges funding from ANR of France under contract No. ANR18CE310019 (SPlaSH). This work is supported by the French National Research Agency in the framework of the Investissements d'Avenir program (ANR-15-IDEX-02), through the funding of the "Origin of Life" project of the Grenoble-Alpes University.
Group:Astronomy Department
Funding AgencyGrant Number
Vassar CollegeNA
Issue or Number:4
Record Number:CaltechAUTHORS:20220922-931611600.12
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:117115
Deposited By: Melissa Ray
Deposited On:28 Sep 2022 21:32
Last Modified:28 Sep 2022 21:32

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