MINDS. JWST/MIRI Reveals a Dynamic Gas-rich Inner Disk inside the Cavity of SY Cha

Author(s): Kamber R. Schwarz, Thomas Henning, Valentin Christiaens, Danny Gasman, Matthias Samland, Giulia Perotti, Hyerin Jang, Sierra L. Grant, Benoît Tabone, Maria Morales-Calderón, Inga Kamp, Ewine F. van Dishoeck, Manuel Güdel, Pierre Olivier Lagage, David Barrado, Alessio Caratti o Garatti, Adrian M. Glauser, Tom P. Ray, Bart Vandenbussche, L. B.F.M. Waters, Aditya M. Arabhavi, Jayatee Kanwar, Göran Olofsson, Donna Rodgers-Lee, Jürgen Schreiber, Milou Temmink
Abstract: SY Cha is a T Tauri star surrounded by a protoplanetary disk with a large cavity seen in the millimeter continuum but has the spectral energy distribution of a full disk. Here we report the first results from JWST/Mid-InfraRed Instrument (MIRI) Medium Resolution Spectrometer (MRS) observations taken as part of the MIRI mid-INfrared Disk Survey (MINDS) GTO Program. The much improved resolution and sensitivity of MIRI-MRS compared to Spitzer enables a robust analysis of the previously detected H₂O, CO, HCN, and CO₂ emission as well as a marginal detection of C₂H₂. We also report the first robust detection of mid-infrared OH and rovibrational CO emission in this source. The derived molecular column densities reveal the inner disk of SY Cha to be rich in both oxygen- and carbon-bearing molecules. This is in contrast to PDS 70, another protoplanetary disk with a large cavity observed with JWST, which displays much weaker line emission. In the SY Cha disk, the continuum, and potentially the line, flux varies substantially between the new JWST observations and archival Spitzer observations, indicative of a highly dynamic inner disk.
Organisation(s): Department of Astrophysics
External organisation(s): Max-Planck-Institut für Astronomie, Université de Liège, Katholieke Universiteit Leuven, Radboud University, Max-Planck-Institut für extraterrestrische Physik, Université Paris Saclay, European Space Astronomy Centre (ESA), University of Groningen, Leiden University, Eidgenössische Technische Hochschule Zürich, Centro de Astrobiología (CSIC-INTA), INAF Astronomical Observatory of Capodimonte , Dublin Institute for Advanced Studies, SRON Netherlands Institute for Space Research , Österreichische Akademie der Wissenschaften (ÖAW), Technische Universität Graz, Stockholm University
Journal: Astrophysical Journal
Volume: 962
No. of pages: 15
ISSN: 0004-637X
DOI: https://doi.org/10.3847/1538-4357/ad1393
Publication date: 02-2024
Peer reviewed: Yes
Austrian Fields of Science 2012: 103003 Astronomy, 103004 Astrophysics
ASJC Scopus subject areas: Astronomy and Astrophysics, Space and Planetary Science
Portal url: https://ucrisportal.univie.ac.at/en/publications/2cb87dda-e7d0-4d5a-bbfb-981d60ffdd4a

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