Two new Saturnian-mass exoplanets discovered

(ORDO NEWS) — An international team of astronomers announces the discovery of two new exoplanets with masses similar to Saturn as part of the CARMENES sky survey based on the radial velocity method. These newly discovered extrasolar planets, designated TYC 2187-512-1 b and TZ Arib, orbit nearby M-type dwarfs.

To date, more than 600 exoplanets have been discovered using the radial velocity method, and more than 100 of these planets orbit dwarfs. spectral class M.

The Calar Alto high-Resolution search for M dwarfs with Exoearths with Near-infrared and optical Echelle Spectrographs (CARMENES) project plays an important role in the discovery of new exoplanets lying in the systems of these stars, which are the most common stars in our Galaxy.

In a new study, a team led by Andreas Quirrenbach of the University of Heidelberg, Germany, announced the discovery of two more extrasolar planets as part of the CARMENES sky survey.

Located at a distance of about 50.46 light years from us, the planet TYC 2187-512-1 b moves around the parent star with a period of 692 days in a nearly circular orbit, remaining at a distance of about 1.22 astronomical units (1 AU is equal to the average distance from the Earth to the Sun) from the star.

The minimum mass of the planet is 0.33 Jupiter masses. The parent star TYC 2187-512-1 belongs to the spectral type M1.0 V and is about half the mass and size of our Sun. The effective temperature of the star is 3743 Kelvin.

The planet TZ Ari b has a mass of at least 0.21 that of Jupiter. The planet’s orbital period is 771 days, and the orbital eccentricity is estimated at 0.46. These data indicate that the exoplanet is separated from the star TZ Ari by a distance of approximately 0.88 AU.

The parent star belongs to the spectral type M5.0 V and has an effective temperature of 3154 Kelvin. This dwarf of spectral type M is about six times smaller in size and mass than our Sun. The system is located at a distance of 14.57 light years from us.

The authors of the work emphasize that the parameters of the planet TZ Arib make it unique among other known giant exoplanets. They note that this planet is only the second confirmed giant orbiting a star with a mass of less than 0.3 solar masses.

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