TESS discovers an old warm Jupiter-like exoplanet

Utilizing the Transiting Exoplanet Survey Satellite tv for pc (TESS), a world workforce of astronomers has detected a brand new outdated and heat Jupiter-like alien world orbiting a G-dwarf star. The newfound exoplanet, designated TOI-5542 b, is the scale of Jupiter—about 30% extra huge than the solar system’s largest gas giant. The discovering is reported in a paper printed September 29 on the arXiv pre-print server.

TESS is conducting a survey of about 200,000 of the brightest stars close to the sun with the purpose of looking for transiting exoplanets. Thus far, it has recognized almost 6,000 candidate exoplanets (TESS Objects of Curiosity, or TOI), of which 256 have been confirmed to date.

Now, a bunch of astronomers led by Nolan Grieves of the College of Geneva in Switzerland, has lately confirmed one other TOI monitored by TESS. They report {that a} transit sign has been recognized within the gentle curve of a metal-poor G dwarf referred to as TOI-5542 (different designation TYC 9086-01210-1). The planetary nature of this sign was confirmed by follow-up observations with CORALIE and Excessive Accuracy Radial velocity Planet Searcher (HARPS) spectrographs.

“We report the invention and characterization of the nice and cozy Jupiter TOI-5542 b. The planet was first detected by TESS as two single transit occasions 375.6 days aside,” the researchers wrote within the paper.

The newfound exoplanet has a radius of roughly 1.01 Jupiter radii and a mass of 1.32 Jupiter lots, which yields a density at a degree of 1.6 g/cm³. It orbits its mum or dad star each 75.12 days, at a distance of 0.33 AU from it. The planet’s equilibrium temperature was estimated to be 441 Okay, subsequently the astronomers categorized it as a heat Jupiter.

The host TOI-5542 is of spectral sort G3V, has a radius of about 1.06 solar radii and is 11% much less huge than the sun. The star has an effective temperature of some 5,700 Okay, luminosity at a degree of roughly 1.05 solar luminosities and its age is estimated to be 10.8 billion years. The metallicity of TOI-5542 was measured to be roughly -0.21.

Bearing in mind that TOI-5542 is almost 11 billion years outdated, the researchers underlined that its exoplanet is subsequently one of many oldest identified long-period heat Jupiters and one of many few with an age estimate.

“TOI-5542b is among the oldest identified heat Jupiters and it’s cool sufficient to be unaffected by inflation resulting from stellar incident flux, making it a worthwhile contribution within the context of planetary composition and formation research,” the authors of the paper concluded.

On condition that TOI-5542 b has a circular orbit, the researchers famous that it’s tough to foretell a formation or migration pathway for this planet. They assume that it probably fashioned through disk migration or in situ formation as different mechanisms which can be extra more likely to go away a planet on an eccentric orbit round its parent star.

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