Utilizing the Transiting Exoplanet Survey Satellite tv for pc (TESS), a global group of astronomers has detected a brand new outdated and heat Jupiter-like alien world orbiting a G-dwarf star.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 dimensions of Jupiter—about 30% extra huge than the solar system’s greatest 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 goal of looking for transiting exoplanets. Thus far, it has recognized practically 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 stage of 1.6 g/cm3. It orbits its mother or father star each 75.12 days, at a distance of 0.33 AU from it. The planet’s equilibrium temperature was estimated to be 441 Ok, due to this fact the astronomers categorised it as a heat Jupiter.
The host TOI-5542 is of spectral kind 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 Ok, luminosity at a stage 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.
Considering that TOI-5542 is sort of 11 billion years outdated, the researchers underlined that its exoplanet is due to this fact one of many oldest recognized long-period heat Jupiters and one of many few with an age estimate.
“TOI-5542b is likely one of the oldest recognized heat Jupiters and it’s cool sufficient to be unaffected by inflation because of stellar incident flux, making it a priceless 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 doubtless shaped by way of disk migration or in situ formation as different mechanisms which can be extra more likely to depart a planet on an eccentric orbit round its parent star.
Nolan Grieves et al, An outdated heat Jupiter orbiting the metal-poor G-dwarf TOI-5542. arXiv:2209.14830v1 [astro-ph.EP], arxiv.org/abs/2209.14830
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