JWST MIRI MRS Images Disk Winds, Water, and CO in an Edge-On Protoplanetary Disk
arxiv(2024)
摘要
We present JWST MIRI MRS observations of the edge-on protoplanetary disk
around the young sub-solar mass star Tau 042021, acquired as part of the Cycle
1 GO program "Mapping Inclined Disk Astrochemical Signatures (MIDAS)." These
data resolve the mid-IR spatial distributions of H_2, revealing X-shaped
emission extending to 200 au above the disk midplane with a semi-opening angle
of 35 ± 5 degrees. We do not velocity-resolve the gas in the spectral
images, but the measured semi-opening angle of the H_2 is consistent with an
MHD wind origin. A collimated, bipolar jet is seen in forbidden emission lines
from [Ne II], [Ne III], [Ni II], [Fe II], [Ar II], and [S III]. Extended H_2O
and CO emission lines are also detected, reaching diameters between 90 and 190
au, respectively. Hot molecular emission is not expected at such radii, and we
interpret its extended spatial distribution as scattering of inner disk
molecular emission by dust grains in the outer disk surface. H I recombination
lines, characteristic of inner disk accretion shocks, are similarly extended,
and are likely also scattered light from the innermost star-disk interface.
Finally, we detect extended PAH emission at 11.3 microns co-spatial with the
scattered light continuum, making this the first low-mass T Tauri star around
which extended PAHs have been confirmed, to our knowledge. MIRI MRS line images
of edge-on disks provide an unprecedented window into the outflow, accretion,
and scattering processes within protoplanetary disks, allowing us to constrain
the disk lifetimes and accretion and mass loss mechanisms.
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