MG15 - Talk detail |
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Participant |
Ferdman, Robert | |||||||
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Institution |
University of East Anglia - School of Chemistry, Norwich Reserarch Park - Norwich - Norfolk - United Kingdom | |||||||
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Session |
NS4 |
Accepted |
Yes |
Order |
3 |
Time |
16:15 | 30' |
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Talk |
Oral abstract |
Title |
The asymmetric double neutron star system PSR J1913+1102 | |||||
| Coauthors | Ferdman, Robert D.; Freire, P. C. C.; The PALFA Collaboration | |||||||
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Abstract |
PSR J1913+1102 is a double neutron star system (DNS) discovered with the Arecibo radio telescope in the PALFA survey. With previous observing campaigns, we have determined that with its short orbital period of less than 5 hours, it is one of the most relativistic DNSs known. We have precisely determined the individual masses, which are the most asymmetric among compact DNS binaries. In this talk, we present the updated timing-derived results on this system. We particularly address the potential impact of its evolutionary history on the interpretation of observed DNS mergers such as GW170817, and the unique constraints it can provide on alternative gravitational theories. |
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Pdf file |
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Session |
NS4 |
Accepted |
Yes |
Order |
4 |
Time |
17:15 | 30' |
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Talk |
Oral abstract |
Title |
PSR J1946+2052: A pulsar-neutron star system in a 1.9-hour orbit | |||||
| Coauthors | K. Stovall, The PALFA Collaboration | |||||||
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Abstract |
PALFA observations have resulted in the discovery of PSR J1946+2052, a 17-ms pulsar in a 1.88-hour, eccentric (e=0.06) orbit with a ~1.2 solar mass companion. We have used the Jansky Very Large Array to localize PSR J1946+2052 to a precision of 0.09 arcseconds using a new phase-binning mode. The improved position enabled a measurement of the spin period derivative of the pulsar and therefore an inferred magnetic field strength at the pulsar surface, indicating that this pulsar has been recycled. This and the orbital eccentricity lead to the conclusion that PSR J1946+2052 is in a double neutron star (DNS) system. Among all known radio pulsars in DNS systems, PSR J1946+2052 has the shortest orbital period and the shortest estimated merger timescale, 46 Myr; at that time it will display the largest spin effects on gravitational-wave waveforms of any such system discovered to date. We have measured the advance of periastron passage for this system, which can be used to infer a total system mass of only 2.50 +/- 0.04 solar masses, so it is among the lowest mass DNS systems. This total mass measurement combined with the minimum companion mass constrains the pulsar mass to less than 1.3 solar masses. |
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Pdf file |
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