Discovery and Timing Follow-Up of Two FAST-Discovered Pulsars from the FAST CRAFTS Survey
Victoria A. Blackmon, Maura A. McLaughlin, De Zhao, Jianping Yuan, Qingdong Wu, Chen-Chen Miao, Meng-Yao Xue, Di Li, and Wei-Wei Zhu

TL;DR
This paper reports the discovery and detailed timing analysis of two pulsars found by FAST, highlighting their properties, challenges in electron density modeling, and implications for future pulsar surveys.
Contribution
First timing solutions and polarization measurements for two pulsars discovered by FAST, revealing insights into their nature and the limitations of current electron density models.
Findings
PSR J0535-0231 is likely a disrupted recycled pulsar.
Existing electron density models underestimate the DM for PSR J0535-0231.
Future FAST discoveries can improve Galactic electron density models.
Abstract
We present the results of Green Bank Telescope (GBT) observations of two pulsars discovered with the Five-hundred-meter Aperture Spherical Radio Telescope (FAST) during the 19-beam Commensal Radio Astronomy FasT Survey (CRAFTS). We highlight the first timing solutions, pulse profiles, flux densities, and polarization measurements at 820 MHz for PSR J0535-0231, with a spin period of 415 ms, and PSR J1816-0518, with a spin period of 1.93 s, from a year-long follow-up campaign. PSR J0535-0231 appears to be partially recycled, but isolated, and likely belongs to the class of disrupted recycled pulsars (DRPs). We find that the two widely used electron density models, NE2001 and YMW16, both fall short of accurately modeling the line-of-sight to PSR J0535-0231, as the maximum dispersion measure (DM) predicted by both models is lower than the pulsar's DM of 117.6 pc cm. Finally, we place…
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