S-CUBED observations of eRASSU J012422.9-724248
ATel #15887; M. J. Coe (Southampton University), J. A. Kennea (PSU), P. Evans (Leicester University)
on 3 Feb 2023; 16:10 UT
Credential Certification: Malcolm Coe (mjcoe@soton.ac.uk)
Subjects: X-ray, Binary, Neutron Star
A new Be/X-ray system, eRASSU J012422.9-724248, has been reported in the SMC Wing by Maitra et al (ATel #15886).
The region has been observed for nearly 7 years now with the S-CUBED project and the source (#287 in the S-CUBED catalogue of Kennea et al, 2018) has been detected 19 times. There have been no major outbursts from this system over this timescales, but rather steady single detections in the XRT at approximately 0.05 counts/s in the energy range 0.3 -- 10 keV. A Lomb-Scargle timing analysis of the detected outbursts over the range 50 -- 80 days shows the strongest peak to be at 63.4 days, consistent with the binary period proposed in ATel #15886. Therefore our detections are probably classic Type I outbursts. But we need to cross-correlate our results with the OGLE data to confirm this.
Maitra et al also report the detection of a pulse period of 341.8s, so we propose that this source is also named SXP 341.8, followi ng the convention adopted for other Be/X-ray binaries in the SMC.
