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http://hdl.handle.net/20.500.12386/32441
Titolo: | PSR J1755-2550: a young radio pulsar with a massive, compact companion | Autori: | Ng, C. Kruckow, M. U. Tauris, T. M. Lyne, A. G. Freire, P. C. C. RIDOLFI, ALESSANDRO Caiazzo, I. Heyl, J. Kramer, M. Cameron, A. D. Champion, D. J. Stappers, B. |
Data pubblicazione: | 2018 | Rivista: | MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | Numero: | 476 | Fascicolo: | 4 | Da pagina:: | 4315 | Abstract: | Radio pulsars found in binary systems with short orbital periods are usually fast spinning as a consequence of recycling via mass transfer from their companion stars; this process is also thought to decrease the magnetic field of the neutron star being recycled. Here, we report on timing observations of the recently discovered binary PSR J1755-2550 and find that this pulsar is an exception: with a characteristic age of 2.1 Myr, it is relatively young; furthermore, with a spin period of 315 ms and a surface magnetic field strength at its poles of 0.88 × 10<SUP>12</SUP> G, the pulsar shows no sign of having been recycled. Based on its timing and orbital characteristics, the pulsar either has a massive white dwarf (WD) or a neutron star (NS) companion. To distinguish between these two cases, we searched radio observations for a potential recycled pulsar companion and analysed archival optical data for a potential WD companion. Neither work returned conclusive detections. We apply population synthesis modelling and find that both solutions are roughly equally probable. Our population synthesis also predicts a minimum mass of 0.90 M<SUB>☉</SUB> for the companion star to PSR J1755-2550 and we simulate the systemic runaway velocities for the resulting WDNS systems which may merge and possibly produce Ca-rich supernovae. Whether PSR J1755-2550 hosts a WD or a NS companion star, it is certainly a member of a rare subpopulation of binary radio pulsars. | URI: | http://hdl.handle.net/20.500.12386/32441 | URL: | https://academic.oup.com/mnras/article/476/4/4315/4904135 | ISSN: | 0035-8711 | DOI: | 10.1093/mnras/sty482 | Bibcode ADS: | 2018MNRAS.476.4315N | Fulltext: | open |
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