Poster Open Access

Activity of the Early M Dwarf Kepler-45 from Starspot and Facula Mapping

Zaleski, Shelley; Valio, Adriana; Carter, Brad; Marsden, Stephen

Temporal mapping of starspots & faculae details surface activity  for the faint hot Jupiter hosting M1V dwarf Kepler-45. Results are consistent with solar-type spot activity, differential rotation, and rapid activity cycles observed for other red dwarfs.  Adopting a solar-type differential rotation profile,  mapping yields a rotation period of 15.520 ± 0.025 d at  transit latitude -33˚. From the mean stellar rotation of 15.762 d, a rotational shear of 0.031 ± 0.004 rad/d, or a relative differential rotation of 7.8 ± 0.9 %, is estimated. The surface rotational shear is consistent with observations and theoretical modelling of other early M dwarfs. Starspot and facular temperatures contrast a few hundred degrees relative to the quiet photosphere, similar with other early M dwarfs. A short-term activity cycle of about 295 d  is reminiscent of those seen for other cool dwarfs.

Files (3.1 MB)
Name Size
Zaleski_CoolStarsPoster205.jpg
md5:bdcc43965c77ba1413d66927a5836961
2.6 MB Download
Zaleski_CoolStarsPoster205.pdf
md5:d42ce51091e69fa337aaee6904b617c3
508.4 kB Download
  • Zaleski, S. M. et al., Activity and Differential Rotation of the Early M Dwarf Kepler-45 from Transit Mapping, 2020, MNRAS, 492, 5141

  • Silva, A. V. R., Method for Spot Detection in Solar-like Stars, 2003, ApJL,585, L147

  • Donati, J. F. et al., Large-scale magnetic topologies of early M dwarfs, 2008, MNRAS, 390, 545

52
36
views
downloads
All versions This version
Views 5252
Downloads 3636
Data volume 39.0 MB39.0 MB
Unique views 4848
Unique downloads 3333

Share

Cite as