A new small glitch in the PSR J1731-4744 (PSR B1727-47) pulsar
ATel #17130; E. Zubieta (IAR), S. B. Araujo Furlan (IATE), S. del Palacio (Chalmers University of Technology, IAR), F. Garcia (IAR), G. Gancio (IAR), C. O. Lousto (RIT), J. A. Combi (IAR, FCAGLP, UJA), on behalf of the PuMA Collaboration
on 4 Apr 2025; 19:57 UT
Credential Certification: Ezequiel Zubieta (ezubieta@iar.unlp.edu.ar)
Subjects: Radio, Neutron Star, Pulsar
Since 2018, the Pulsar Monitor in Argentina (PuMA) collaboration has been carrying out a pulsar timing program, observing a series of pulsars from the Southern Hemisphere with up to daily cadence. Observations are performed using the two 30-m antennas at the Argentine Institute of Radioastronomy (IAR), using two ROACH receivers with a bandwidth of 400 MHz centered at 1.4 GHz.
For PSR J1731-4744 (PSR B1727-47), six glitches have been reported so far, the latter in MJD 57984 (see JB Catalogue). Three of them were small glitches, with dF/F approx. 1e-9, two of the order of 1e-7, and one giant glitch with a relative frequency jump of approx. 1e-6.
Here we report on a new small glitch event recently detected in our timing data. Our preliminary analysis shows a sudden change in its rotation frequency (1.2048707 Hz) that occurred between MJD 60750.35 and MJD 60752.35, with a relative amplitude dF0/F0 = 1.69(4)E-8, accompanied by a relative change in spin-down rate dF1/F1 = 0.010(3).
The top panel of the attached Figure shows the timing residuals obtained without fitting for the glitch, while the bottom panel shows the residuals after fitting for the sudden changes in F0 and F1 reported above.
We will continue to monitor this pulsar. We encourage other observers to help resolve the pulsar post-glitch behaviour.
