The FAST discovery of an eclipsing binary millisecond pulsar in the globular cluster M92 (NGC 6341)

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Pan, Zhi-Chen; Ransom, Scott; Lorimer, Duncan; Fiore, William C.; Qian, Lei; Wang, Lin; Stappers, Ben; Hobbs, George ORCID ID icon; Zhu, Wei-wei; Yue, Y.L.; Wang, Pei; Lu, JiGuang; Liu, Kuo; Peng, Bo; Zhang, Lei; Li, Di


2020-03-10


Journal Article


Astrophysical Journal Letters


892


1


5 p.


We report the discovery of an eclipsing binary millisecond pulsar in the globular cluster M92 (NGC 6341) with the Five-hundred-meter Aperture Spherical radio Telescope (FAST). PSR J1717+4308A, or M92A, has a pulse frequency of 316.5 Hz (3.16 ms) and a dispersion measure of 35.45 pc cm-3. The pulsar is a member of a binary system with an orbital period of 0.20 days around a low-mass companion that has a median mass of ∼0.18 M☉. From observations so far, at least two eclipsing events have been observed in each orbit. The longer one lasted for ∼5000 s in the orbital phase range 0.1-0.5. The other lasted for ∼500 s and occurred between 1000 and 2000 s before or after the longer eclipsing event. The lengths of these two eclipsing events also change. These properties suggest that J1717+4308A is a "red-back" system with a low-mass main-sequence or sub-giant companion. Timing observations of the pulsar and further searches of the data for additional pulsars are ongoing.


Institute of Physics Publishing, Inc.


L6


High energy astrophysical phenomena; astrophysics of galaxies


Astronomical and Space Sciences not elsewhere classified


https://doi.org/10.3847/2041-8213/ab799d


EP202096


Journal article - Refereed


English


Pan, Zhi-Chen; Ransom, Scott; Lorimer, Duncan; Fiore, William C.; Qian, Lei; Wang, Lin; Stappers, Ben; Hobbs, George; Zhu, Wei-wei; Yue, Y.L.; Wang, Pei; Lu, JiGuang; Liu, Kuo; Peng, Bo; Zhang, Lei; Li, Di. The FAST discovery of an eclipsing binary millisecond pulsar in the globular cluster M92 (NGC 6341). Astrophysical Journal Letters. 2020; 892(1):5 p.. https://doi.org/10.3847/2041-8213/ab799d



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