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.
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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
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- Publication date:
- February 24, 2021
- DOI:
-
- Keyword(s):
- Cool Stars on the main sequence
- Meeting:
- The 20.5th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (CS20.5), virtually anywhere, March 2-4, 2021
- Related identifiers:
- Cites
- 10.1093/mnras/staa103 (Journal article)
- Communities:
- License (for files):
- Creative Commons Attribution 4.0 International