Two new Saturn-mass exoplanets discovered

Tomasz Nowakowski is a member of the Science X Network.

The detection of two new exoplanets is reported by an international team of astronomer. TYC 2187-52-1 b and TZ Ari b are alien worlds that are in the vicinity of M-dwarf stars. The paper was published on arXiv.org.

More than 600 exoplanets have been detected so far and more than 100 of them have been found around M dwarfs. The Calar Alto high-Resolution search for M dwarfs has been crucial in the search for new alien worlds.

The discovery of two extrasolar worlds has been made by a group of researchers led by a professor at a German university. The 3.5 m telescope at the Calar Alto observatory in Almería, Spain, has confirmed that two nearby M dwarfs are host to massive planets.

The discovery of two Saturn-mass planets from the CAR MENES survey was reported in the paper.

At a distance of 50.46 light years, TYC 2187-512-1 b is at a distance of 1.22AU from its host. The minimum mass of the planet was estimated. The parent star of TYC 2187-512-1 is half the size and mass of the sun. The temperature was measured to be 3,734 K.

TZ Ari b has a mass of at least 0.21 Jupiter mass. The planet's average length of time in the air was 771 days, while its average length of time in the air was 0.46. The results show that the exoplanet is separated by about 0.88AU. The host star has an effective temperature of 3,154 K and a type M dwarf that is six times smaller and less massive than the sun. The system is located far away.

The parameters of TZ Ari b make it a unique planet among other giant exoworlds according to the authors of the paper. They noted that it is the second confirmed giant planet in the vicinity of a star.

The mass of TZ Ari is similar to that of GJ 3512 the other low-mass host of a gas giant planet. The two systems are located in an extreme region of the planet mass / host mass parameter space, where disk fragmentation appears to be a more likely formation mechanism than build-up of a core through planetesimal or pebble accretion.

According to their calculations, the occurrence rate of giant planets with periods up to two years should be between 2% and 6%. The completion of the survey would make this number more difficult to reach.

More information: A. Quirrenbach et al, The CARMENES search for exoplanets around M dwarfs: Two Saturn-mass planets orbiting active stars. arXiv:2203.16504v1 [astro-ph.EP], arxiv.org/abs/2203.16504 Provided by Science X Network

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