Discovery and timing of ten new millisecond pulsars in the globular cluster Terzan 5
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| Format: | Preprint |
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2024
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| author | Padmanabh, P. V. Ransom, S. M. Freire, P. C. C. Ridolfi, A. Taylor, J. D. Choza, C. Clark, C. J. Abbate, F. Bailes, M. Barr, E. D. Buchner, S. Burgay, M. DeCesar, M. E. Chen, W. Corongiu, A. Champion, D. J. Dutta, A. Geyer, M. Hessels, J. W. T. Kramer, M. Possenti, A. Stairs, I. H. Stappers, B. W. Krishnan, V. Venkatraman Vleeschower, L. Zhang, L. |
| author_facet | Padmanabh, P. V. Ransom, S. M. Freire, P. C. C. Ridolfi, A. Taylor, J. D. Choza, C. Clark, C. J. Abbate, F. Bailes, M. Barr, E. D. Buchner, S. Burgay, M. DeCesar, M. E. Chen, W. Corongiu, A. Champion, D. J. Dutta, A. Geyer, M. Hessels, J. W. T. Kramer, M. Possenti, A. Stairs, I. H. Stappers, B. W. Krishnan, V. Venkatraman Vleeschower, L. Zhang, L. |
| contents | We report the discovery of ten new pulsars in the globular cluster Terzan 5 as part of the Transients and Pulsars with MeerKAT (TRAPUM) Large Survey Project. We observed Terzan 5 at L-band (856--1712 MHz) with the MeerKAT radio telescope for four hours on two epochs, and performed acceleration searches of 45 out of 288 tied-array beams covering the core of the cluster. We obtained phase-connected timing solutions for nine discoveries, covering nearly two decades of archival observations from the Green Bank Telescope for all but one. Highlights include PSR J1748$-$2446ao which is an eccentric ($e = 0.32$) wide-orbit (orbital period $P_{\rm b} = 57.55$ d) system. We were able to measure the rate of advance of periastron ($\dotω$) for this system allowing us to determine a total mass of $3.17 \pm \, 0.02\, \rm M_{\odot}$. With a minimum companion mass ($M_{\rm c}$) of $\sim 0.8\, \rm M_{\odot}$, PSR J1748$-$2446ao is a candidate double neutron star (DNS) system. If confirmed to be a DNS, it would be the fastest spinning pulsar ($P = 2.27$ ms) and the longest orbital period measured for any known DNS system. PSR J1748$-$2446ap has the second highest eccentricity for any recycled pulsar ($e \sim 0.905$) and for this system we can measure the total mass ($1.997 \pm 0.006\, \rm M_{\odot}$) and also estimate the individual pulsar and companion masses. PSR J1748$-$2446ar is an eclipsing redback (minimum $M_{\rm c} \sim 0.34\, \rm M_{\odot}$) system whose properties confirm it to be the counterpart to a previously published source identified in radio and X-ray imaging. With these discoveries, the total number of confirmed pulsars in Terzan 5 is 49, the highest for any globular cluster so far. These discoveries further enhance the rich set of pulsars known in Terzan 5 and provide scope for a deeper understanding of binary stellar evolution, cluster dynamics and ensemble population studies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_17799 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Discovery and timing of ten new millisecond pulsars in the globular cluster Terzan 5 Padmanabh, P. V. Ransom, S. M. Freire, P. C. C. Ridolfi, A. Taylor, J. D. Choza, C. Clark, C. J. Abbate, F. Bailes, M. Barr, E. D. Buchner, S. Burgay, M. DeCesar, M. E. Chen, W. Corongiu, A. Champion, D. J. Dutta, A. Geyer, M. Hessels, J. W. T. Kramer, M. Possenti, A. Stairs, I. H. Stappers, B. W. Krishnan, V. Venkatraman Vleeschower, L. Zhang, L. High Energy Astrophysical Phenomena We report the discovery of ten new pulsars in the globular cluster Terzan 5 as part of the Transients and Pulsars with MeerKAT (TRAPUM) Large Survey Project. We observed Terzan 5 at L-band (856--1712 MHz) with the MeerKAT radio telescope for four hours on two epochs, and performed acceleration searches of 45 out of 288 tied-array beams covering the core of the cluster. We obtained phase-connected timing solutions for nine discoveries, covering nearly two decades of archival observations from the Green Bank Telescope for all but one. Highlights include PSR J1748$-$2446ao which is an eccentric ($e = 0.32$) wide-orbit (orbital period $P_{\rm b} = 57.55$ d) system. We were able to measure the rate of advance of periastron ($\dotω$) for this system allowing us to determine a total mass of $3.17 \pm \, 0.02\, \rm M_{\odot}$. With a minimum companion mass ($M_{\rm c}$) of $\sim 0.8\, \rm M_{\odot}$, PSR J1748$-$2446ao is a candidate double neutron star (DNS) system. If confirmed to be a DNS, it would be the fastest spinning pulsar ($P = 2.27$ ms) and the longest orbital period measured for any known DNS system. PSR J1748$-$2446ap has the second highest eccentricity for any recycled pulsar ($e \sim 0.905$) and for this system we can measure the total mass ($1.997 \pm 0.006\, \rm M_{\odot}$) and also estimate the individual pulsar and companion masses. PSR J1748$-$2446ar is an eclipsing redback (minimum $M_{\rm c} \sim 0.34\, \rm M_{\odot}$) system whose properties confirm it to be the counterpart to a previously published source identified in radio and X-ray imaging. With these discoveries, the total number of confirmed pulsars in Terzan 5 is 49, the highest for any globular cluster so far. These discoveries further enhance the rich set of pulsars known in Terzan 5 and provide scope for a deeper understanding of binary stellar evolution, cluster dynamics and ensemble population studies. |
| title | Discovery and timing of ten new millisecond pulsars in the globular cluster Terzan 5 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2403.17799 |