SIMBAD references

2021A&A...649A.130T - Astronomy and Astrophysics, volume 649A, 130-130 (2021/5-1)

Simulations of starspot anomalies within TESS exoplanetary transit light curves. II. Forecasting the frequency of starspot anomalies appearing in TESS exoplanetary transit light curves.


Abstract (from CDS):

Aims. We determine the starspot detection rate in exoplanetary transit light curves for M and K dwarf stars observed by the Transiting Exoplanet Survey Satellite (TESS) using various starspot filling factors and starspot distributions.
Methods. We used 3.6x109 simulations of planetary transits around spotted stars using the transit-starspot model PRISM. The simulations cover a range of starspot filling factors using one of three distributions: uniform, polar-biased, and mid-latitude. After construction of the stellar disc and starspots, we checked the transit cord for starspots and examined the change in flux of each starspot to determine whether or not a starspot anomaly would be detected. The results were then compared to predicted planetary detections for TESS.
Results. The results show that for the case of a uniform starspot distribution, 64±9 M dwarf and 23±4 K dwarf transit light curves observed by TESS will contain a starspot anomaly. This reduces to 37±6 M dwarf and 12±2 K dwarf light curves for a polar-biased distribution and 47±7 M dwarf and 21±4 K dwarf light curves for a mid-latitude distribution.
Conclusions. Currently there are only 17 M dwarf and 10 K dwarf confirmed planetary systems from TESS, none of which are confirmed as showing starspot anomalies. All three starspot distributions can explain the current trend. However, with such a small sample, a firm conclusion cannot be made at present. In the coming years when more TESS M and K dwarf exoplanetary systems have been detected and characterised, it will be possible to determine the dominant starspot distribution.

Abstract Copyright: © ESO 2021

Journal keyword(s): stars: late-type - stars: activity - starspots - planets and satellites: general - methods: numerical - techniques: photometric

Simbad objects: 27

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