TY - JOUR
T1 - JWST-MIRI spectroscopy of warm molecular emission and variability in the AS 209 disk
AU - Muñoz-Romero, Carlos E.
AU - Öberg, Karin I.
AU - Banzatti, Andrea
AU - Pontoppidan, Klaus M.
AU - Andrews, Sean M.
AU - Wilner, David J.
AU - Bergin, Edwin A.
AU - Czekala, Ian
AU - Law, Charles J.
AU - Salyk, Colette
AU - Teague, Richard
AU - Qi, Chunhua
AU - Bergner, Jennifer B.
AU - Huang, Jane
AU - Walsh, Catherine
AU - Guzmán, Viviana V.
AU - Cleeves, L. Ilsedore
AU - Aikawa, Yuri
AU - Bae, Jaehan
AU - Booth, Alice S.
AU - Cataldi, Gianni
AU - Ilee, John D.
AU - Le Gal, Romane
AU - Long, Feng
AU - Loomis, Ryan A.
AU - Menard, François
AU - Liu, Yao
N1 - Funding: F. M. has received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement No. 101053020, project Dust2Planets).
C.W. acknowledges financial support from the Science and Technology Facilities Council and UK Research and Innovation (grant numbers ST/X001016/1
and MR/T040726/1).
PY - 2024/3/20
Y1 - 2024/3/20
N2 - We present MIRI Medium-resolution Spectrograph observations of the large, multi-gapped protoplanetary disk around the T Tauri star AS 209. The observations reveal hundreds of water vapor lines from 4.9–25.5 μm toward the inner ∼1 au in the disk, including the first detection of rovibrational water emission in this disk. The spectrum is dominated by hot (∼800 K) water vapor and OH gas, with only marginal detections of CO2, HCN, and a possible colder water vapor component. Using slab models with a detailed treatment of opacities and line overlap, we retrieve the column density, emitting area, and excitation temperature of water vapor and OH, and provide upper limits for the observable mass of other molecules. Compared to MIRI spectra of other T Tauri disks, the inner disk of AS 209 does not appear to be atypically depleted in CO2 nor HCN. Based on Spitzer Infrared Spectrograph observations, we further find evidence for molecular emission variability over a 10 yr baseline. Water, OH, and CO2 line luminosities have decreased by factors of 2–4 in the new MIRI epoch, yet there are minimal continuum emission variations. The origin of this variability is yet to be understood.
AB - We present MIRI Medium-resolution Spectrograph observations of the large, multi-gapped protoplanetary disk around the T Tauri star AS 209. The observations reveal hundreds of water vapor lines from 4.9–25.5 μm toward the inner ∼1 au in the disk, including the first detection of rovibrational water emission in this disk. The spectrum is dominated by hot (∼800 K) water vapor and OH gas, with only marginal detections of CO2, HCN, and a possible colder water vapor component. Using slab models with a detailed treatment of opacities and line overlap, we retrieve the column density, emitting area, and excitation temperature of water vapor and OH, and provide upper limits for the observable mass of other molecules. Compared to MIRI spectra of other T Tauri disks, the inner disk of AS 209 does not appear to be atypically depleted in CO2 nor HCN. Based on Spitzer Infrared Spectrograph observations, we further find evidence for molecular emission variability over a 10 yr baseline. Water, OH, and CO2 line luminosities have decreased by factors of 2–4 in the new MIRI epoch, yet there are minimal continuum emission variations. The origin of this variability is yet to be understood.
U2 - 10.3847/1538-4357/ad20e9
DO - 10.3847/1538-4357/ad20e9
M3 - Article
SN - 0004-637X
VL - 964
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1
M1 - 36
ER -