2019/04/19 by N. Meunier, A. -M. Lagrange, A.-M. Lagrange · 42 citations
Physics and Astronomy · #Binary star #Circumstellar habitable zone #Planet #Planetary habitability #Pulsars and Gravitational Waves Research #Radial velocity #Scientific Research and Discoveries #Stars #Stellar, planetary, and galactic studies #astro-ph.EP #astro-ph.SR
paper · pdf · doi:10.1051/0004-6361/201935099
published in Astronomy and Astrophysics 625, L6 (EDP Sciences) · Accepted in A&A Letters
arxiv created 2019/04/19 · openalex publication_date 2019/04/22 · openalex created_date 2019/04/25 · arxiv updated 2019/05/22 · openalex updated_date 2026/08/06
Context . Magnetic activity and surface flows at different scales pertub radial velocity measurements. This affects the detectability of low-mass exoplanets. Aims . In these flows, the effect of supergranulation is not as well characterized as the other flows, and we wish to estimate its effect on the detection of Earth-like planets in the habitable zone of Sun-like stars. Methods . We produced time series of radial velocities due to oscillations, granulation, and supergranulation, and estimated the detection limit for a G2 star and a period of 300 days. We also studied in detail the behavior of the power when the signal of a 1 M Earth planet was superposed on the signal from the stellar flows. Results . We find that the detection rate does not reach 100% except for the supergranulation level we assume, which is still optimistic, and for an excellent sampling. Conclusions . We conclude that with current knowledge, it is a very challenging task to find Earth twins around Sun-like stars with our current capabilities.