Did Binary Neutron Star Merger GW170817 Leave Behind A Long-lived Neutron Star?
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866917679501148160 |
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| author | DuPont, Marcus MacFadyen, Andrew |
| author_facet | DuPont, Marcus MacFadyen, Andrew |
| contents | We consider the observational implications of the binary neutron star (BNS) merger GW170817 leaving behind a rapidly rotating massive neutron star that launches a relativistic, equatorial outflow as well as a jet. We show that if the equatorial outflow (ring) is highly beamed in the equatorial plane, its luminosity can be "hidden" from view until late times, even if carrying a significant fraction of the spin-down energy of the merger remnant. This hidden ring reveals itself as a re-brightening in the light curve once it slows down enough for Earth to be within the ring's relativistic beaming solid angle. We compute semi-analytic light curves using this model and find they are in agreement with the observations thus far, and we provide predictions for the ensuing afterglow. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_20329 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Did Binary Neutron Star Merger GW170817 Leave Behind A Long-lived Neutron Star? DuPont, Marcus MacFadyen, Andrew High Energy Astrophysical Phenomena We consider the observational implications of the binary neutron star (BNS) merger GW170817 leaving behind a rapidly rotating massive neutron star that launches a relativistic, equatorial outflow as well as a jet. We show that if the equatorial outflow (ring) is highly beamed in the equatorial plane, its luminosity can be "hidden" from view until late times, even if carrying a significant fraction of the spin-down energy of the merger remnant. This hidden ring reveals itself as a re-brightening in the light curve once it slows down enough for Earth to be within the ring's relativistic beaming solid angle. We compute semi-analytic light curves using this model and find they are in agreement with the observations thus far, and we provide predictions for the ensuing afterglow. |
| title | Did Binary Neutron Star Merger GW170817 Leave Behind A Long-lived Neutron Star? |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2405.20329 |