Water In Protoplanetary Disks With JWST-MIRI
This work aims at providing some general tools for the analysis of water spectra as observed in protoplanetary disks with JWST-MIRI. We use 25 high-quality spectra from the JDISC Survey reduced with asteroid calibrators as presented in Pontoppidan et al. (2024).
First, we present a spectral atlas to illustrate the clustering of water transitions from different upper level energies (Eu) and identify single (un-blended) lines that provide the most reliable measurements. With the atlas, we demonstrate two important excitation effects: one related to the opacity saturation of ortho-para line pairs that overlap, and the other to the sub-thermal excitation of v=1−1 lines scattered across the v=0−0 rotational band.
Second, from this larger line selection we define a list of fundamental lines spanning Eu from 1500 to 6000 K to develop simple line-ratio diagrams as diagnostics of temperature components and column density. Third, we report the detection of disk-rotation Doppler broadening of molecular lines, which demonstrates the radial distribution of water emission at different Eu and confirms from gas kinematics a radially-extended ≈ 170-190 K reservoir recently suggested from the analysis of line fluxes.
We also report the detection of narrow blue-shifted absorption from an inner disk wind in ro-vibrational H2O and CO lines, which may be observed in disks at inclinations >50 deg. We summarize these findings and tools into a general recipe that should be beneficial to community efforts to study water in planet-forming regions.
Andrea Banzatti, Colette Salyk, Klaus M. Pontoppidan, John Carr, Ke Zhang, Nicole Arulanantham, L. Ilsedore Cleeves, Joan Najita, Karin I. Oberg, Ilaria Pascucci, Geoffrey A. Blake, Sebastiaan Krijt, Carlos E. Munoz-Romero, Edwin A. Bergin, Lucas A. Cieza, Paola Pinilla, Feng Long, Patrick Mallaney, Chengyan Xie, the JDISCS collaboration
Water In Protoplanetary Disks With JWST-MIRI: spectral excitation atlas, diagnostic diagrams for temperature and column density, and detection of disk-rotation line broadening
Comments: Community input and feedback is very welcome. Posted as submitted to AJ; revision in progress based on referee report. All Appendix figures will be included soon
Subjects: Earth and Planetary Astrophysics (astro-ph.EP); Instrumentation and Methods for Astrophysics (astro-ph.IM)
Cite as: arXiv:2409.16255 [astro-ph.EP] (or arXiv:2409.16255v1 [astro-ph.EP] for this version)
https://doi.org/10.48550/arXiv.2409.16255
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Submission history
From: Andrea Banzatti Dr.
[v1] Tue, 24 Sep 2024 17:23:29 UTC (6,113 KB)
https://arxiv.org/abs/2409.16255
Astrobiology
