An Unusual Reservoir of Water Emission in the VV CrA A Protoplanetary Disk - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles The Astronomical Journal Year : 2022

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

Colette Salyk
  • Function : Author
Klaus M. Pontoppidan
  • Function : Author
Andrea Banzatti
  • Function : Author
Ulrich Käufl
  • Function : Author
Cassandra Hall
  • Function : Author
Ilaria Pascucci
  • Function : Author
Geoffrey A. Blake
  • Function : Author
Richard Alexander
  • Function : Author
Inga Kamp
  • Function : Author


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.
Fichier principal
Vignette du fichier
Salyk_2022_AJ_164_136.pdf (11.17 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

insu-03860281 , version 1 (19-11-2022)





Colette Salyk, Klaus M. Pontoppidan, Andrea Banzatti, Ulrich Käufl, Cassandra Hall, et al.. An Unusual Reservoir of Water Emission in the VV CrA A Protoplanetary Disk. The Astronomical Journal, 2022, 164, ⟨10.3847/1538-3881/ac8878⟩. ⟨insu-03860281⟩
7 View
1 Download



Gmail Facebook Twitter LinkedIn More