Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 892, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/2041-8213/ab799d
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Funding
- Basic Science Center Project of the National Nature Science Foundation of China (NSFC) [11988101]
- National Nature Science Foundation of China (NSFC) [11725313, 11803051, U1631237, 11703047, 11773041, 11690024, 11743002, 11873067]
- National Key R&D Program of China [2017YFA0402600]
- State Key Development Program for Basic Research [2015CB857100]
- Strategic Priority Research Program of the CAS [XDB23000000]
- CAS Light of West China Program
- NSF Physics Frontiers Center [1430284]
- National Science Foundation [AAG-1616042, OIA-1458952, PHY-1430284]
- Research Corporation for Scientific Advancement
- STEM Mountains of Excellence Graduate Fellowship
- Youth Innovation Promotion Association of CAS [2018075]
- CAS Pioneer Hundred Talents Program
- European Research Council for the ERC Synergy Grant BlackHoleCam [610058]
- FAST FELLOWSHIP from Special Funding for Advanced Users budgeted
- CAS-MPG LEGACY funding Low-Frequency Gravitational Wave Astronomy and Gravitational Physics in Space
- CAS-MPG LEGACY
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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 similar to 0.18 M. From observations so far, at least two eclipsing events have been observed in each orbit. The longer one lasted for similar to 5000 s in the orbital phase range 0.1-0.5. The other lasted for similar to 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.
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