SwiftJ1727.8-1613: superhumps?
This X-ray transient looks like to have started showing
superhumps. An analysis of the data since Sep. 17 shows
a signal at 0.2116(1) d (full amplitude 0.07 mag with
multiple peaks in a period). Signals at P/2 or P/3 were
weaker and the 0.2116-d period appears real.
This signal apparently appeared in conjunction with
the spectral/state transition (ATel #16247). Considering
the case of ASASSN-18ey = MAXI J1820+070 (arXiv:2107.03681,
Variable Star Bulletin 74), the current variation appears
to be stage A superhumps.
observers:
Berto Monard, Itoh-san and Josch Hambsch
