CARMENES input catalogue of M dwarfs. IV. New rotation periods from photometric time series
Abstract
Aims: The main goal of this work is to measure rotation periods of the M-type dwarf stars being observed by the CARMENES exoplanet survey to help distinguish radial-velocity signals produced by magnetic activity from those produced by exoplanets. Rotation periods are also fundamental for a detailed study of the relation between activity and rotation in late-type stars.
Methods: We look for significant periodic signals in 622 photometric time series of 337 bright, nearby M dwarfs obtained by long-time baseline, automated surveys (MEarth, ASAS, SuperWASP, NSVS, Catalina, ASAS-SN, K2, and HATNet) and for 20 stars which we obtained with four 0.2-0.8 m telescopes at high geographical latitudes.
Results: We present 142 rotation periods (73 new) from 0.12 d to 133 d and ten long-term activity cycles (six new) from 3.0 a to 11.5 a. We compare our determinations with those in the existing literature; we investigate the distribution of Prot in the CARMENES input catalogue, the amplitude of photometric variability, and their relation to v sini and pEW(Hα); and we identify three very active stars with new rotation periods between 0.34 d and 23.6 d.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- January 2019
- DOI:
- 10.1051/0004-6361/201833316
- arXiv:
- arXiv:1810.03338
- Bibcode:
- 2019A&A...621A.126D
- Keywords:
-
- stars: activity;
- stars: late-type;
- stars: rotation;
- techniques: photometric;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 34 pages, 43 figures, 2 appendix tables