Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 922, Issue 1, Pages -Publisher
IOP Publishing Ltd
DOI: 10.3847/2041-8213/ac365c
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Funding
- National SKA Program of China [2020SKA0120100]
- National Natural Science Foundation of China [12041304, 12041303, 12163001, U1938117, U1731238]
- National Key Research and Development Program of China [2017YFA0402600]
- Youth Innovation Promotion Association of Chinese Academy of Sciences
- Xinjiang Uygur Autonomous Region of China for Flexibly Fetching in Upscale Talents, China Postdoctoral Science Foundation [2020M681758]
- Operation, Maintenance and Upgrading Fund for Astronomical Telescopes and Facility Instruments, budgeted from the Ministry of Finance of China (MOF)
- Key Lab of FAST, National Astronomical Observatories, Chinese Academy of Sciences
- Guizhou Provincial Science and Technology Foundation [[2020]1Y016]
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In this study, we reported an exceptionally bright observation of PSR J1720-0533 using FAST, revealing quasi-periodic pulse emission variations during the eclipse that may be caused by plasma lensing. Additionally, we found that the linear polarization of the pulsar disappears before the eclipse, and pulse scattering may play a significant role in the eclipse of PSR J1720-0533.
We report on an unusually bright observation of PSR J1720-0533 using the Five-hundred-meter Aperture Spherical radio Telescope (FAST). The pulsar is in a black widow system that was discovered by the Commensal Radio Astronomy FAST Survey (CRAFTS). By coincidence, a bright scintillation maximum was simultaneous with the eclipse in our observation, which allowed for precise measurements of flux density variations, as well as dispersion measure (DM) and polarization. We found that there are quasi-periodic pulse emission variations with a modulation period of similar to 22 s during the ingress of the eclipse, which could be caused by plasma lensing. No such periodic modulation was found during the egress of the eclipse. The linear polarization of the pulsar disappears before the eclipse, even before there is a visually obvious change in DM. We also found that the pulse scattering may play an important role in the eclipse of PSR J1720-0533.
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