[vsnet-alert 22394] ASASSN-18ey = MAXI J1820+070: appearance of another periodicity?

[Yasuyuki WAKAMATSU]

ASASSN-18ey = MAXI J1820+070: appearance of another periodicity?

Tonny Vanmunster, Itoh-san, Roger Pickard, Peter Nelson, Josch Hambsch,
Tamas Tordai, Michael Richmond and Stephen Brincat reported further
observations.

Our PDM analysis of the most recent data indicates a possibility of the
appearance of another periodicity in superhumps. The main peak of the
superhump period is 0.7050(6) d, which is longer than the previous one,
and there is a secondary peak around 0.5 d. This may be related to
double-peaked humps.

Further observations are encouraged.