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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2511.11247 |
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| _version_ | 1866911265927987200 |
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| author | Esseldeurs, Mats Decin, Leen De Ridder, Joris Mori, Yoshiya Karakas, Amanda I. Malfait, Jolien Danilovich, Taïssa Mathis, Stéphane Richards, Anita M. S. Saha, Raghvendra Yates, Jeremy Van de Sande, Marie Baes, Maarten Baudry, Alain Bolte, Jan Ceulemans, Thomas De Ceuster, Frederik Mellah, Ileyk El Etoka, Sandra Gottlieb, Carl Herpin, Fabrice Kervella, Pierre Landri, Camille Marinho, Louise McDonald, Iain Menten, Karl Millar, Tom Osborn, Zara Pimpanuwat, Bannawit Plane, John Price, Daniel J. Siess, Lionel Vermeulen, Owen Wong, Ka Tat |
| author_facet | Esseldeurs, Mats Decin, Leen De Ridder, Joris Mori, Yoshiya Karakas, Amanda I. Malfait, Jolien Danilovich, Taïssa Mathis, Stéphane Richards, Anita M. S. Saha, Raghvendra Yates, Jeremy Van de Sande, Marie Baes, Maarten Baudry, Alain Bolte, Jan Ceulemans, Thomas De Ceuster, Frederik Mellah, Ileyk El Etoka, Sandra Gottlieb, Carl Herpin, Fabrice Kervella, Pierre Landri, Camille Marinho, Louise McDonald, Iain Menten, Karl Millar, Tom Osborn, Zara Pimpanuwat, Bannawit Plane, John Price, Daniel J. Siess, Lionel Vermeulen, Owen Wong, Ka Tat |
| contents | Close companions influence stellar evolution through tidal interactions, mass transfer, and mass loss effects. While such companions are detected around young stellar objects, main-sequence stars, red giants, and compact objects, direct observational evidence of close-in companions around asymptotic giant branch (AGB) stars has remained elusive. Here, we present (sub)millimeter time-domain imaging spectroscopy revealing the Keplerian motion of a close-in companion around the AGB star pi1 Gruis. The companion, slightly more massive than the AGB star, is likely a main-sequence star. Unlike more evolved stars with companions at comparable distances, pi1 Gru's companion follows a circular orbit, suggesting an eccentricity-generating mechanism late- or post-AGB. Our analysis suggests that model-predicted circularization rates may be underestimated. Our results highlight the potential of multi-epoch (sub)millimeter interferometry in detecting the Keplerian motion of close companions to giant stars and open avenues for our understanding of tidal interaction physics and binary evolution. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_11247 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Evidence for the Keplerian orbit of a close companion around a giant star Esseldeurs, Mats Decin, Leen De Ridder, Joris Mori, Yoshiya Karakas, Amanda I. Malfait, Jolien Danilovich, Taïssa Mathis, Stéphane Richards, Anita M. S. Saha, Raghvendra Yates, Jeremy Van de Sande, Marie Baes, Maarten Baudry, Alain Bolte, Jan Ceulemans, Thomas De Ceuster, Frederik Mellah, Ileyk El Etoka, Sandra Gottlieb, Carl Herpin, Fabrice Kervella, Pierre Landri, Camille Marinho, Louise McDonald, Iain Menten, Karl Millar, Tom Osborn, Zara Pimpanuwat, Bannawit Plane, John Price, Daniel J. Siess, Lionel Vermeulen, Owen Wong, Ka Tat Solar and Stellar Astrophysics Close companions influence stellar evolution through tidal interactions, mass transfer, and mass loss effects. While such companions are detected around young stellar objects, main-sequence stars, red giants, and compact objects, direct observational evidence of close-in companions around asymptotic giant branch (AGB) stars has remained elusive. Here, we present (sub)millimeter time-domain imaging spectroscopy revealing the Keplerian motion of a close-in companion around the AGB star pi1 Gruis. The companion, slightly more massive than the AGB star, is likely a main-sequence star. Unlike more evolved stars with companions at comparable distances, pi1 Gru's companion follows a circular orbit, suggesting an eccentricity-generating mechanism late- or post-AGB. Our analysis suggests that model-predicted circularization rates may be underestimated. Our results highlight the potential of multi-epoch (sub)millimeter interferometry in detecting the Keplerian motion of close companions to giant stars and open avenues for our understanding of tidal interaction physics and binary evolution. |
| title | Evidence for the Keplerian orbit of a close companion around a giant star |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2511.11247 |