2020/01/01 by В. В. Макаров, Makarov, Valeri V., Alexey Goldin +1
Physics and Astronomy · #Astronomy and Astrophysical Research #Earth and Planetary Astrophysics (astro-ph.EP) #FOS: Physical sciences #Gamma-ray bursts and supernovae #Solar and Stellar Astrophysics (astro-ph.SR) #Stellar, planetary, and galactic studies
paper · pdf · doi:10.48550/arxiv.2001.00239
openalex publication_date 2020/01/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
KIC 5773205 is the least luminous eclipsing M dwarf found in the Villanova\ncatalog of eclipsing binaries detected by the it Kepler mission. We\nprocessed and analyzed the three available quarters of mission data for this\nstar and discovered a persistent periodic variation of the light curve with a\nperiod, which is in exact 4:5 commensurability to the orbital period. Three\nroutes of interpretation are considered: 1) non-radial pulsations excited by\nthe tidal interaction at a specific eigenfrequency; 2) a high-order spin-orbit\nresonance caused by the tides; 3) an ellipsoidal deformation caused by an outer\norbiting companion in a mean motion resonance. All three explanations meet\nconsiderable difficulties, but the available facts seem to favor the tidally\ndriven pulsation scenario. The star may represent a new type of heartbeat\nbinary with tidally excited pulsations that are close to the orbital motion in\nfrequency.\n