Complex Rotational Modulation of Rapidly Rotating M-Stars Observed with TESS

@inproceedings{Zhan2019ComplexRM,
  title={Complex Rotational Modulation of Rapidly Rotating M-Stars Observed with TESS},
  author={Zhao Zhan and Maximilian N. Gunther and Shelley Rappaport and Katalin Ol'ah and Anke Mann and Alan M. Levine and Joshua N. Winn and Feihu Dai and Guangen Zhou and Chelsea X. Huang and Landon Bouma and Michael J. Ireland and George R. Ricker and Roland Kraft Vanderspek and David J. Latham and Sara Seager and Jon Jenkins and Douglas A. Caldwell and Jim Doty and Zahra. Essack and G. Fűr{\'e}sz and M. E. R. Leidos and P. Rowden and J. C. Smith and Keivan G. Stassun and Michelle S. Vezie},
  year={2019}
}
We have searched for short periodicities in the light curves of stars with $T_{\rm eff}$ cooler than 4000 K made from 2-minute cadence data obtained in TESS sectors 1 and 2. Herein we report the discovery of 10 rapidly rotating M-dwarfs with highly structured rotational modulation patterns among 10 M dwarfs found to have rotation periods less than 1 day. Star-spot models cannot explain the highly structured periodic variations which typically exhibit between 10 and 40 Fourier harmonics. A… CONTINUE READING
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