A huge super-earth orbits its star in half a day

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 fromThe University of Heidelberg in Germany reports the discovery of another exoplanet with 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 accurate 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 research, TOI-1685b has a radiusabout 1.7 times the radius of the Earth and about 3.78 times more 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 planet's equilibrium temperature is estimated at about 796 ° C (1,069 Kelvin). TOI-1685b is one of the hottest transiting super-lands.

The host star of the planet - TOI-1685 - dwarfspectral type 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.

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CARMENES - Calar Alto high-Resolution search for M dwarfs with Exoearths with Near-infrared and optical Échelle Spectrographs

Spectral class M - brown dwarfs,close in mass to red dwarfs, in the early stages after formation, they can have a spectral type of M6.5 or fainter. Such stars are also sometimes called late-M dwarfs. As they cool down (and their cooling may take 10 billion years), they gradually pass into the L class, which is more characteristic of brown dwarfs.