(ORDO NEWS) — Using the Transiting Exoplanet Survey Satellite (TESS), an international team of astronomers has discovered a Jupiter-like planet orbiting a G-dwarf.
Exoplanet TOI-5542 b is about 30% more massive than the largest gas giant in the solar system.
TESS is surveying some 200,000 of the brightest stars, looking for transiting exoplanets. So far, it has identified nearly 6,000 candidate exoplanets (TOIs), 256 of which have already been confirmed.
A team of astronomers led by Nolan Greaves at the University of Geneva in Switzerland recently confirmed another TOI tracked by TESS.
They report that a transit signal has been identified in the light curve of a G dwarf known as TOI-5542 (other designation TYC 9086-01210-1).
The planetary nature of this signal was confirmed by subsequent observations with the CORALIE and High Accuracy Radial velocity Planet Searcher (HARPS) spectrographs.
The exoplanet has a radius approximately equal to 1.01 Jupiter radii and a mass of about 1.32 Jupiter masses, TOI-5542 b has a density of 1.6 g/cm3.
It orbits its parent star every 75.12 days at a distance of 0.33 AU. The equilibrium temperature of the planet is estimated at 441 K.
The parent star TOI-5542 belongs to the spectral type G3V. Its radius is about 1.06 solar radii, and it is 11% less massive than the Sun.
The star has an effective temperature of about 5700 K, a luminosity of about 1.05 solar luminosities, and its age is estimated at 10.8 billion years. The metallicity of TOI-5542 is approximately -0.21.
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