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

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...

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Published in:The Astrophysical journal 2024-02, Vol.962 (1), p.8
Main Authors: Schwarz, Kamber R., Henning, Thomas, Christiaens, Valentin, Gasman, Danny, Samland, Matthias, Perotti, Giulia, Jang, Hyerin, Grant, Sierra L., Tabone, Benoît, Morales-Calderón, Maria, Kamp, Inga, van Dishoeck, Ewine F., Güdel, Manuel, Lagage, Pierre-Olivier, Barrado, David, Caratti o Garatti, Alessio, Glauser, Adrian M., Ray, Tom P., Vandenbussche, Bart, Waters, L. B. F. M., Arabhavi, Aditya M., Kanwar, Jayatee, Olofsson, Göran, Rodgers-Lee, Donna, Schreiber, Jürgen, Temmink, Milou
Format: Article
Language:English
Subjects:
Carbon dioxide emissions
Emission analysis
Infrared instruments
Infrared spectroscopy
James Webb Space Telescope
Molecular spectroscopy
Oxygen
Planet formation
Protoplanetary disks
Robustness
Spectral energy distribution
T Tauri stars
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Summary: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 H 2 O, CO, HCN, and CO 2 emission as well as a marginal detection of C 2 H 2 . 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.
ISSN:0004-637X
1538-4357
1538-4357
DOI:10.3847/1538-4357/ad1393