Successful telescope proposal: Where are the mid-sized flares of ultracool M dwarfs?

Katja Poppenhaeger

Research output: Other contribution

Abstract

We propose to observe the M8.5 dwarf SCR J1845-6357 with XMM-Newton EPIC for 60 ks. Very low-mass M dwarfs show a distinct drop in X-ray luminosity compared to slightly more massive M dwarfs. Surprisingly, this does not happen at the mass threshold where M dwarfs become fully convective (M4), but at significantly lower masses (M8). These very low mass stars seem to have a flaring behaviour different from earlier type stars: they display either occasional large flares or a very low-level "flickering" in their X-ray light curves, but not the canonical power-law flare-energy distribution observed for the Sun and other cool stars. Our aim is to collect a long-duration light curve for one of the most nearby ultracool dwarfs to quantify how its flare-energy distribution differs from earlier type stars.
Original languageEnglish
TypeAccepted observing proposal
Publication statusPublished - 01 Oct 2013

Keywords

  • Stars
  • White Dwarfs
  • Solar System
  • SCR J1845-6357

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