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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2504.19434 |
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| _version_ | 1866916709682642944 |
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| author | Yoshida, Tomohiro C. Curone, Pietro Stadler, Jochen Facchini, Stefano Teague, Richard Momose, Munetake Andrews, Sean M. Bae, Jaehan Barraza-Alfaro, Marcelo Benisty, Myriam Cataldi, Gianni Fasano, Daniele Flock, Mario Fukagawa, Misato Galloway-Sprietsma, Maria Garg, Himanshi Hall, Cassandra Huang, Jane Ilee, John D. Izquierdo, Andrés F. Kanagawa, Kazuhiro Lesur, Geoffroy Longarini, Cristiano Loomis, Ryan A. Orihara, Ryuta Pinte, Christophe Price, Daniel J. Rosotti, Giovanni Yen, Hsi-Wei Wafflard-Fernandez, Gaylor Wilner, David J. Winter, Andrew J. Wölfer, Lisa Zawadzki, Brianna |
| author_facet | Yoshida, Tomohiro C. Curone, Pietro Stadler, Jochen Facchini, Stefano Teague, Richard Momose, Munetake Andrews, Sean M. Bae, Jaehan Barraza-Alfaro, Marcelo Benisty, Myriam Cataldi, Gianni Fasano, Daniele Flock, Mario Fukagawa, Misato Galloway-Sprietsma, Maria Garg, Himanshi Hall, Cassandra Huang, Jane Ilee, John D. Izquierdo, Andrés F. Kanagawa, Kazuhiro Lesur, Geoffroy Longarini, Cristiano Loomis, Ryan A. Orihara, Ryuta Pinte, Christophe Price, Daniel J. Rosotti, Giovanni Yen, Hsi-Wei Wafflard-Fernandez, Gaylor Wilner, David J. Winter, Andrew J. Wölfer, Lisa Zawadzki, Brianna |
| contents | The gas surface density is one of the most relevant physical quantities in protoplanetary disks. However, its precise measurement remains highly challenging due to the lack of a direct tracer. In this study, we report the spatially-resolved detection of pressure-broadened line wings in the CO $J=3-2$ line in the RX J1604.3-2130 A transition disk as part of the exoALMA large program. Since pressure-broadened line wings are sensitive to the total gas volume density, we robustly constrain the radial dependence of the gas surface density and midplane pressure in the region located $50-110$ au from the central star, which encompasses the dust ring of the system. The peak radius of the midplane pressure profile matches the dust ring radial location, directly proving radial dust trapping at a gas pressure maximum. The peak gas surface density is $18-44\ {\rm g\ cm^{-2}}$} and decreases at radii interior to and exterior of the dust ring. A comparison of the gas and dust surface densities suggests that the disk turbulence is as low as $α_{\rm turb} \sim 2\times10^{-4}$. Despite dust trapping, the gas-to-dust surface density ratio at the ring peak is { $70-400$}, which implies already-formed protoplanets and/or less efficient dust trapping. The gas surface density drop at radii interior to the ring is consistent with a gas gap induced by a Jupiter-mass planet. The total gas mass within $50 < r < 110$ au is estimated to be $\sim 0.05-0.1\ M_\odot$ ($50-100\ {M_{\rm Jup}}$), suggesting that planetary system formation is possible. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_19434 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | exoALMA XIV. Gas Surface Densities in the RX J1604.3-2130 A Disk from Pressure-broadened CO Line Wings Yoshida, Tomohiro C. Curone, Pietro Stadler, Jochen Facchini, Stefano Teague, Richard Momose, Munetake Andrews, Sean M. Bae, Jaehan Barraza-Alfaro, Marcelo Benisty, Myriam Cataldi, Gianni Fasano, Daniele Flock, Mario Fukagawa, Misato Galloway-Sprietsma, Maria Garg, Himanshi Hall, Cassandra Huang, Jane Ilee, John D. Izquierdo, Andrés F. Kanagawa, Kazuhiro Lesur, Geoffroy Longarini, Cristiano Loomis, Ryan A. Orihara, Ryuta Pinte, Christophe Price, Daniel J. Rosotti, Giovanni Yen, Hsi-Wei Wafflard-Fernandez, Gaylor Wilner, David J. Winter, Andrew J. Wölfer, Lisa Zawadzki, Brianna Earth and Planetary Astrophysics The gas surface density is one of the most relevant physical quantities in protoplanetary disks. However, its precise measurement remains highly challenging due to the lack of a direct tracer. In this study, we report the spatially-resolved detection of pressure-broadened line wings in the CO $J=3-2$ line in the RX J1604.3-2130 A transition disk as part of the exoALMA large program. Since pressure-broadened line wings are sensitive to the total gas volume density, we robustly constrain the radial dependence of the gas surface density and midplane pressure in the region located $50-110$ au from the central star, which encompasses the dust ring of the system. The peak radius of the midplane pressure profile matches the dust ring radial location, directly proving radial dust trapping at a gas pressure maximum. The peak gas surface density is $18-44\ {\rm g\ cm^{-2}}$} and decreases at radii interior to and exterior of the dust ring. A comparison of the gas and dust surface densities suggests that the disk turbulence is as low as $α_{\rm turb} \sim 2\times10^{-4}$. Despite dust trapping, the gas-to-dust surface density ratio at the ring peak is { $70-400$}, which implies already-formed protoplanets and/or less efficient dust trapping. The gas surface density drop at radii interior to the ring is consistent with a gas gap induced by a Jupiter-mass planet. The total gas mass within $50 < r < 110$ au is estimated to be $\sim 0.05-0.1\ M_\odot$ ($50-100\ {M_{\rm Jup}}$), suggesting that planetary system formation is possible. |
| title | exoALMA XIV. Gas Surface Densities in the RX J1604.3-2130 A Disk from Pressure-broadened CO Line Wings |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2504.19434 |