A systematic method to identify runaways from star clusters produced from single-binary interactions: A case study of M67
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909689713786880 |
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| author | Herrera-Urquieta, A. Leigh, N. Pinto, J. Díaz-Cerda, G. Grondin, S. M. Webb, J. J. Mathieu, R. Ryu, T. Geller, A. Kounkel, M. Toonen, S. Vilaxa-Campos, M. |
| author_facet | Herrera-Urquieta, A. Leigh, N. Pinto, J. Díaz-Cerda, G. Grondin, S. M. Webb, J. J. Mathieu, R. Ryu, T. Geller, A. Kounkel, M. Toonen, S. Vilaxa-Campos, M. |
| contents | One hypothesis for runaway stars (RSs) is that they are ejected from star clusters with high velocities relative to the cluster center-of-mass motion. There are two competing mechanisms for their production: supernova-based ejections in binaries, where one companion explodes, leaves no remnant, and launches the other companion at the instantaneous orbital velocity, and the disintegration of triples (or higher-order multiples), which produces a recoiled runaway binary (RB) and an RS. We search for RS candidates using data from the Gaia DR3 survey with a focus on triple disintegration since in this case the product is always a binary and a single star that should be moving in opposite directions. We created a systematic methodology to look for candidate RS-RB runaway pairs produced from the disintegration of bound three-body systems formed from single-binary interactions based on momentum conservation and causality. The method we use is general and can be applied to any cluster with a 5D kinematic data set. We used our criteria to search for these pairs in a 150 pc circular field of view surrounding the open cluster M67, which we used as a benchmark cluster to test the robustness of our method. Our results reveal only one RS-RB pair that is consistent with all of our selection criteria out of an initial sample of $10^8$ pairs. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2504_06252 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A systematic method to identify runaways from star clusters produced from single-binary interactions: A case study of M67 Herrera-Urquieta, A. Leigh, N. Pinto, J. Díaz-Cerda, G. Grondin, S. M. Webb, J. J. Mathieu, R. Ryu, T. Geller, A. Kounkel, M. Toonen, S. Vilaxa-Campos, M. Solar and Stellar Astrophysics Astrophysics of Galaxies One hypothesis for runaway stars (RSs) is that they are ejected from star clusters with high velocities relative to the cluster center-of-mass motion. There are two competing mechanisms for their production: supernova-based ejections in binaries, where one companion explodes, leaves no remnant, and launches the other companion at the instantaneous orbital velocity, and the disintegration of triples (or higher-order multiples), which produces a recoiled runaway binary (RB) and an RS. We search for RS candidates using data from the Gaia DR3 survey with a focus on triple disintegration since in this case the product is always a binary and a single star that should be moving in opposite directions. We created a systematic methodology to look for candidate RS-RB runaway pairs produced from the disintegration of bound three-body systems formed from single-binary interactions based on momentum conservation and causality. The method we use is general and can be applied to any cluster with a 5D kinematic data set. We used our criteria to search for these pairs in a 150 pc circular field of view surrounding the open cluster M67, which we used as a benchmark cluster to test the robustness of our method. Our results reveal only one RS-RB pair that is consistent with all of our selection criteria out of an initial sample of $10^8$ pairs. |
| title | A systematic method to identify runaways from star clusters produced from single-binary interactions: A case study of M67 |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2504.06252 |