The Orbit and Companion of PSR J1622-0315: Variable Asymmetry and a Massive Neutron Star
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| Format: | Preprint |
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2024
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| _version_ | 1866910640334962688 |
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| author | Sen, Bidisha Linares, Manuel Kennedy, Mark R. Breton, Rene P. Misra, Devina Turchetta, Marco Dhillon, Vikram S. Sanchez, Daniel Mata Clark, Colin J. |
| author_facet | Sen, Bidisha Linares, Manuel Kennedy, Mark R. Breton, Rene P. Misra, Devina Turchetta, Marco Dhillon, Vikram S. Sanchez, Daniel Mata Clark, Colin J. |
| contents | The companion to PSR J1622-0315, one of the most compact known redback millisecond pulsars, shows extremely low irradiation despite its short orbital period. We model this system to determine the binary parameters, combining optical observations from NTT in 2017 and NOT in 2022 with the binary modeling code ICARUS. We find a best-fit neutron star mass of $2.3 \pm 0.4\,\text{M}_\odot $, and a companion mass of $0.15 \pm 0.02\,\text{M}_\odot$. We detect for the first time low-level irradiation from asymmetry in the minima as well as a change in the asymmetry of the maxima of its light curves over five years. Using star spot models, we find better fits than those from symmetric direct heating models, with consistent orbital parameters. We discuss an alternative scenario where the changing asymmetry is produced by a variable intrabinary shock. In summary, we find that PSR J1622-0315 combines low irradiation with variable light curve asymmetry, and a relatively high neutron star mass. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2407_10800 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The Orbit and Companion of PSR J1622-0315: Variable Asymmetry and a Massive Neutron Star Sen, Bidisha Linares, Manuel Kennedy, Mark R. Breton, Rene P. Misra, Devina Turchetta, Marco Dhillon, Vikram S. Sanchez, Daniel Mata Clark, Colin J. High Energy Astrophysical Phenomena The companion to PSR J1622-0315, one of the most compact known redback millisecond pulsars, shows extremely low irradiation despite its short orbital period. We model this system to determine the binary parameters, combining optical observations from NTT in 2017 and NOT in 2022 with the binary modeling code ICARUS. We find a best-fit neutron star mass of $2.3 \pm 0.4\,\text{M}_\odot $, and a companion mass of $0.15 \pm 0.02\,\text{M}_\odot$. We detect for the first time low-level irradiation from asymmetry in the minima as well as a change in the asymmetry of the maxima of its light curves over five years. Using star spot models, we find better fits than those from symmetric direct heating models, with consistent orbital parameters. We discuss an alternative scenario where the changing asymmetry is produced by a variable intrabinary shock. In summary, we find that PSR J1622-0315 combines low irradiation with variable light curve asymmetry, and a relatively high neutron star mass. |
| title | The Orbit and Companion of PSR J1622-0315: Variable Asymmetry and a Massive Neutron Star |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2407.10800 |