More rapidly rotating PMS M dwarfs with light curves suggestive of orbiting clouds of material

John Stauffer, Luisa Rebull, Trevor David, Moira Jardine, Andrew Collier Cameron, Ann Marie Cody, Lynne Hillenbrand, David Barrado, Julian van Eyken, Carl Melis, Cesar Briceno

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16 Citations (Scopus)


In a previous paper, using data from K2 Campaign 2, we identified 11very low mass members of the ρ Oph and Upper Scorpius star-forming region as having periodic photometric variability and phased light curves showing multiple scallops or undulations. All the stars with the "scallop-shell" light curve morphology are mid-to-late M dwarfs without evidence of active accretion, and with photometric periods generally <1 day. Their phased light curves have too much structure to be attributed to non-axisymmetrically distributed photospheric spots and rotational modulation. We have now identified an additional eight probable members of the same star-forming region plus three stars in the Taurus star-forming region with this same light curve morphology and sharing the same period and spectral type range as the previous group. We describe the light curves of these new stars in detail and present their general physical characteristics. We also examine the properties of the overall set of stars in order to identify common features that might help elucidate the causes of their photometric variability.
Original languageEnglish
Article number63
Number of pages16
JournalAstronomical Journal
Issue number2
Early online date16 Jan 2018
Publication statusPublished - Feb 2018


  • Stars: pre-main sequence
  • Stars: variables: T Tauri, Herbig Ae/Be


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