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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/2504.19371 |
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| _version_ | 1866910922389323776 |
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| author | Trapman, Leon Longarini, Cristiano Rosotti, Giovanni P. Andrews, Sean M. Bae, Jaehan Barraza-Alfaro, Marcelo Benisty, Myriam Cataldi, Gianni Curone, Pietro Czekala, Ian Facchini, Stefano Fasano, Daniele Flock, Mario Fukagawa, Misato Galloway-Sprietsma, Maria Garg, Himanshi Hall, Cassandra Huang, Jane Ilee, John D. Izquierdo, Andres F. Kanagawa, Kazuhiro Lesur, Geoffroy Lodato, Giuseppe Loomis, Ryan A. Orihara, Ryuta Paneque-Carreno, Teresa Pinte, Christophe Price, Daniel Stadler, Jochen Teague, Richard van Terwisga, Sierk Testi, Leonardo Yen, Hsi-Wei Wafflard-Fernandez, Gaylor Wilner, David J. Winter, Andrew J. Wölfer, Lisa Yoshida, Tomohiro C. Zawadzki, Brianna Zhang, Ke |
| author_facet | Trapman, Leon Longarini, Cristiano Rosotti, Giovanni P. Andrews, Sean M. Bae, Jaehan Barraza-Alfaro, Marcelo Benisty, Myriam Cataldi, Gianni Curone, Pietro Czekala, Ian Facchini, Stefano Fasano, Daniele Flock, Mario Fukagawa, Misato Galloway-Sprietsma, Maria Garg, Himanshi Hall, Cassandra Huang, Jane Ilee, John D. Izquierdo, Andres F. Kanagawa, Kazuhiro Lesur, Geoffroy Lodato, Giuseppe Loomis, Ryan A. Orihara, Ryuta Paneque-Carreno, Teresa Pinte, Christophe Price, Daniel Stadler, Jochen Teague, Richard van Terwisga, Sierk Testi, Leonardo Yen, Hsi-Wei Wafflard-Fernandez, Gaylor Wilner, David J. Winter, Andrew J. Wölfer, Lisa Yoshida, Tomohiro C. Zawadzki, Brianna Zhang, Ke |
| contents | The gas masses of protoplanetary disks are important but elusive quantities. In this work we present new ALMA observations of N2H+ (3-2) for 11 exoALMA disks. N2H+ is a molecule sensitive to CO freeze-out and has recently been shown to significantly improve the accuracy of gas masses estimated from CO line emission. We combine these new observations with archival N2H+ and CO isotopologue observations to measure gas masses for 19 disks, predominantly from the exoALMA Large program. For 15 of these disks the gas mass has also been measured using gas rotation curves. We show that the CO + N2H+ line emission-based gas masses typically agree with the kinematically measured ones within a factor 3 (1-2σ). Gas disk masses from CO + N2H+ are on average a factor 2.3(+0.7,-1.0) x lower than the kinematic disk masses, which could suggest slightly lower N2 abundances and/or lower midplane ionization rates than typically assumed. Herbig disks are found to have ISM level CO gas abundances based on their CO and N2H+ fluxes, which sets them apart from T-Tauri disks where abundances are typically 3-30x lower. The agreement between CO + N2H+ -based and kinematically measured gas masses is promising and shows that multi-molecule line fluxes are a robust tool to accurately measure disk masses at least for extended disks. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_19371 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | ExoALMA XIII. gas masses from N2H+ and C18O: a comparison of protoplanetary gas disk mass measurement techniques Trapman, Leon Longarini, Cristiano Rosotti, Giovanni P. Andrews, Sean M. Bae, Jaehan Barraza-Alfaro, Marcelo Benisty, Myriam Cataldi, Gianni Curone, Pietro Czekala, Ian Facchini, Stefano Fasano, Daniele Flock, Mario Fukagawa, Misato Galloway-Sprietsma, Maria Garg, Himanshi Hall, Cassandra Huang, Jane Ilee, John D. Izquierdo, Andres F. Kanagawa, Kazuhiro Lesur, Geoffroy Lodato, Giuseppe Loomis, Ryan A. Orihara, Ryuta Paneque-Carreno, Teresa Pinte, Christophe Price, Daniel Stadler, Jochen Teague, Richard van Terwisga, Sierk Testi, Leonardo Yen, Hsi-Wei Wafflard-Fernandez, Gaylor Wilner, David J. Winter, Andrew J. Wölfer, Lisa Yoshida, Tomohiro C. Zawadzki, Brianna Zhang, Ke Earth and Planetary Astrophysics Astrophysics of Galaxies The gas masses of protoplanetary disks are important but elusive quantities. In this work we present new ALMA observations of N2H+ (3-2) for 11 exoALMA disks. N2H+ is a molecule sensitive to CO freeze-out and has recently been shown to significantly improve the accuracy of gas masses estimated from CO line emission. We combine these new observations with archival N2H+ and CO isotopologue observations to measure gas masses for 19 disks, predominantly from the exoALMA Large program. For 15 of these disks the gas mass has also been measured using gas rotation curves. We show that the CO + N2H+ line emission-based gas masses typically agree with the kinematically measured ones within a factor 3 (1-2σ). Gas disk masses from CO + N2H+ are on average a factor 2.3(+0.7,-1.0) x lower than the kinematic disk masses, which could suggest slightly lower N2 abundances and/or lower midplane ionization rates than typically assumed. Herbig disks are found to have ISM level CO gas abundances based on their CO and N2H+ fluxes, which sets them apart from T-Tauri disks where abundances are typically 3-30x lower. The agreement between CO + N2H+ -based and kinematically measured gas masses is promising and shows that multi-molecule line fluxes are a robust tool to accurately measure disk masses at least for extended disks. |
| title | ExoALMA XIII. gas masses from N2H+ and C18O: a comparison of protoplanetary gas disk mass measurement techniques |
| topic | Earth and Planetary Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2504.19371 |