Searching for Rotational X‐Ray Modulation on TIC 277539431

TIC 277539431, a fast rotating M7 dwarf, was detected to host the highest latitude flare to date at . Magnetic activity like stellar flares occurring at high latitude indicate occurrence of coronal loops at these latitudes on fully‐convective M dwarfs. In contrast, sunspots usually occur below . In our study we look for modulation on the X‐ray signal occurring due to occultation of coronal loops by the star due to stellar rotation. We report an updated rotation period for this star as min based on TESS sectors 12, 37, 39, 64 and 65. We conducted fits by varying the amplitude and the phase of a sinusoidally modulated signal derived from the new rotation period. We find no evidence of rotational modulation in the X‐ray signal. This could be due to multiple scenarios, such as lack of a stable coronal loop during observation or the modulated signal being too weak, however given the dataset, individual scenarios cannot be distinguished.