Saved in:
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2026
|
| Subjects: | |
| Online Access: | https://arxiv.org/abs/2602.01620 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866915768434688000 |
|---|---|
| author | Hardiman, Caitlyn Pinte, Christophe Price, Daniel J. Hilder, Thomas Hammond, Iain Danilovich, Taïssa Andrews, Sean M. Teague, Richard Rosotti, Giovanni Flock, Mario Cataldi, Gianni Bae, Jaehan Barraza-Alfaro, Marcelo Benisty, Myriam Cuello, Nicolás Curone, Pietro Czekala, Ian Facchini, Stefano Fasano, Daniele Fukagawa, Misato Galloway-Sprietsma, Maria Garg, Himanshi Hall, Cassandra Huang, Jane Ilee, John D. Izquierdo, Andres F. Kanagawa, Kazuhiro Lesur, Geoffroy Lodato, Giuseppe Longarini, Cristiano Loomis, Ryan Menard, Francois Orihara, Ryuta Stadler, Jochen Yen, Hsi-Wei Wafflard-Fernandez, Gaylor Wilner, David J. Winter, Andrew J. Wölfer, Lisa Yoshida, Tomohiro C. Zawadzki, Brianna |
| author_facet | Hardiman, Caitlyn Pinte, Christophe Price, Daniel J. Hilder, Thomas Hammond, Iain Danilovich, Taïssa Andrews, Sean M. Teague, Richard Rosotti, Giovanni Flock, Mario Cataldi, Gianni Bae, Jaehan Barraza-Alfaro, Marcelo Benisty, Myriam Cuello, Nicolás Curone, Pietro Czekala, Ian Facchini, Stefano Fasano, Daniele Fukagawa, Misato Galloway-Sprietsma, Maria Garg, Himanshi Hall, Cassandra Huang, Jane Ilee, John D. Izquierdo, Andres F. Kanagawa, Kazuhiro Lesur, Geoffroy Lodato, Giuseppe Longarini, Cristiano Loomis, Ryan Menard, Francois Orihara, Ryuta Stadler, Jochen Yen, Hsi-Wei Wafflard-Fernandez, Gaylor Wilner, David J. Winter, Andrew J. Wölfer, Lisa Yoshida, Tomohiro C. Zawadzki, Brianna |
| contents | Turbulence is expected to transport angular momentum and drive mass accretion in protoplanetary disks. One way to directly measure turbulent motion in disks is through molecular line broadening. DM Tau is one of only a few disks with claimed detection of nonthermal line broadening of 0.25cs-0.33cs, where cs is the sound speed. Using the radiative transfer code mcfost within a Bayesian inference framework that evaluates over five million disk models to efficiently sample the parameter space, we fit high-resolution (0.15", 28 m s-1) 12CO J = 3-2 observations of DM Tau from the exoALMA Large Program. This approach enables us to simultaneously constrain the disk structure and kinematics, revealing a significant nonthermal contribution to the line width of ~0.4cs, inconsistent with purely thermal motions. Using the CO-based disk structure as a starting point, we reproduce the CS J = 7-6 emission well, demonstrating that the CS (which is more sensitive to nonthermal motions than CO) agrees with the turbulence inferred from the CO fit. Establishing a well-constrained background disk model further allows us to identify residual structures in the moment maps that deviate from the expected emission, revealing localized perturbations that may trace forming planets. This framework provides a powerful general approach for extracting disk structure and nonthermal broadening directly from molecular line data and can be applied to other disks with high-quality observations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_01620 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | exoALMA XIX: Confirmation of Non-thermal Line Broadening in the DM Tau Protoplanetary Disk Hardiman, Caitlyn Pinte, Christophe Price, Daniel J. Hilder, Thomas Hammond, Iain Danilovich, Taïssa Andrews, Sean M. Teague, Richard Rosotti, Giovanni Flock, Mario Cataldi, Gianni Bae, Jaehan Barraza-Alfaro, Marcelo Benisty, Myriam Cuello, Nicolás Curone, Pietro Czekala, Ian Facchini, Stefano Fasano, Daniele Fukagawa, Misato Galloway-Sprietsma, Maria Garg, Himanshi Hall, Cassandra Huang, Jane Ilee, John D. Izquierdo, Andres F. Kanagawa, Kazuhiro Lesur, Geoffroy Lodato, Giuseppe Longarini, Cristiano Loomis, Ryan Menard, Francois Orihara, Ryuta Stadler, Jochen Yen, Hsi-Wei Wafflard-Fernandez, Gaylor Wilner, David J. Winter, Andrew J. Wölfer, Lisa Yoshida, Tomohiro C. Zawadzki, Brianna Earth and Planetary Astrophysics Turbulence is expected to transport angular momentum and drive mass accretion in protoplanetary disks. One way to directly measure turbulent motion in disks is through molecular line broadening. DM Tau is one of only a few disks with claimed detection of nonthermal line broadening of 0.25cs-0.33cs, where cs is the sound speed. Using the radiative transfer code mcfost within a Bayesian inference framework that evaluates over five million disk models to efficiently sample the parameter space, we fit high-resolution (0.15", 28 m s-1) 12CO J = 3-2 observations of DM Tau from the exoALMA Large Program. This approach enables us to simultaneously constrain the disk structure and kinematics, revealing a significant nonthermal contribution to the line width of ~0.4cs, inconsistent with purely thermal motions. Using the CO-based disk structure as a starting point, we reproduce the CS J = 7-6 emission well, demonstrating that the CS (which is more sensitive to nonthermal motions than CO) agrees with the turbulence inferred from the CO fit. Establishing a well-constrained background disk model further allows us to identify residual structures in the moment maps that deviate from the expected emission, revealing localized perturbations that may trace forming planets. This framework provides a powerful general approach for extracting disk structure and nonthermal broadening directly from molecular line data and can be applied to other disks with high-quality observations. |
| title | exoALMA XIX: Confirmation of Non-thermal Line Broadening in the DM Tau Protoplanetary Disk |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2602.01620 |