Poster Open Access

Activity of TRAPPIST-1 analogue stars observed with TESS

Seli, Bálint; Vida, Krisztián; Moór, Attila; Pál, András; Oláh, Katalin

Wolk, Scott

We present an analysis of TRAPPIST-1 like ultracool dwarfs with TESS full-frame image photometry from the first two years of the primary mission. We constructed a volume-limited sample up to 50 pc, consisting of stars in the vicinity of TRAPPIST-1 on the Gaia color-magnitude diagram. We searched for flares and rotational modulation on the light curves of 248 stars. We determined rotational periods for 42 stars, and estimated the ages of 88 stars using kinematic information. A weak correlation between rotational period and age is observed. The composite flare frequency distribution shows a power-law index similar to TRAPPIST-1, and it is extended to higher energies. The results imply that while superflares can be expected every few decades, the flare rate of such stars is insufficient to fully destroy the possible ozone layer of orbiting planets.

Files (1.3 MB)
Name Size
1.3 MB Download
  • F. Almeida-Fernandes & H. J. Rocha-Pinto (2018), MNRAS, 476, 184

  • J. Gagné et al. (2018), ApJ, 856, 23

  • K. Vida et al. (2017), ApJ, 841, 124

  • P. B. Rimmer et al. (2018), SciA, 4, 3302

  • M. A. Tilley et al. (2019), AsBio, 19, 64

All versions This version
Views 7373
Downloads 8080
Data volume 102.6 MB102.6 MB
Unique views 5959
Unique downloads 7171


Cite as