Using NASA’s Transiting Exoplanet Survey Satellite (TESS), an international team of astronomers has discovered a new exoplanet, the super-earth TOI-1685b. This is reported in an article on the arXiv.org preprint site.
TESS is conducting a study of about 200,000 of the brightest stars around the Sun in order to detect transiting exoplanets. To date, more than 2,500 exoplanet candidates (TESS or TOI objects of interest) have been identified, 113 of which have already been confirmed.
A group of astronomers led by Paz Bloom from the University of Heidelberg in Germany reports the discovery of another exoplanet with the help of this spacecraft. Between November 28 and December 23, 2019, TESS observed a nearby M-class dwarf star, TOI-1685. This led to the detection of a transit signal on the light curve of this object. The planetary character was confirmed by subsequent precise radial velocity measurements with the CARMENES instrument.
Planet TOI-1685b is about 70% larger than Earth, a feature of its ultra-short orbital period. It is 0.669 days.
According to the study, TOI-1685b has a radius of about 1.7 times that of the Earth and is about 3.78 times as massive. This means that the volumetric density of the planet is at the level of 4.21 g / cm³. These parameters make TOI-1685b the least dense ultrashort-periodic planet around the M dwarf known to date.
The equilibrium temperature of TOI-1685b is estimated at about 796 ° C (1,069 Kelvin). Consequently, it turned out to be one of the hottest transiting exoplanets the size of the Earth.
The host star of the planet, TOI-1685, is a dwarf of spectral class M. It is located about 122.5 light years from Earth. Its effective temperature is 3,161 ° C (3,434 K) and is estimated to be between 0.6 and 2 billion years old.