Scientists reanalyze properties of extraordinarily eccentric planetary system HD 76920b

Researchers led by Wu Tao from the Yunnan Observatories of the Chinese language Academy of Sciences and Jiang Chen from the Max Planck Institute for Photo voltaic System Analysis reanalyzed properties of extraordinarily eccentric planetary system HD 76920b by means of detailed asteroseismic evaluation of its host star HD 76920.

The examine was printed in The Astrophysical Journal on March 2.

HD 76920b has an orbital eccentricity of 0.856 (akin to the eccentric photo voltaic system our bodies Comet 2P/Encke and asteroid 3200 Phaethon), making it some of the eccentric planets identified to orbit developed stars.

Photo voltaic-like oscillations in HD 76920 had been detected for the primary time, utilizing 5 sectors of the TESS gentle curve that cowl round 140 days of information. By using asteroseismic modeling carried out by 5 particular person worldwide groups, the researchers decided the improved measurements of the stellar mass, radius and age, and up to date the semimajor axis and mass of the planet.

With these up to date properties of the planetary system, they confirmed that the planet is at present sufficiently removed from the star to expertise negligible tidal decay till being engulfed within the stellar envelope. And so they predicted this occasion will happen inside about 100 Myr, relying on the stellar mannequin used.

Asteroseismology is most identified for its potential to characterize stellar elementary parameters (e.g., mass, radius, density) to a excessive stage of precision which is a vital think about constraining the properties of planets.

This work of asteroseismic evaluation emphasizes the potential of stellar oscillations for characterizing exoplanet methods by means of the synergy between exoplanet analysis and asteroseismology.