Hot planet found moving 'gently' around host star

Using NASA's Transiting Exoplanet Exploration Satellite (TESS), an international team of astronomers

discovered a new hot Jupiter. It is estimated to be three times as massive as Jupiter and is in orbit around the rapidly rotating star TOI-778.

Transit signal identified on the curveof the rapidly rotating early dwarf star F3V, designated TOI-778 (also known as HD 115447). The planetary nature of the signal was confirmed by subsequent ground-based photometry and velocity measurements.

The radius of the planet is 1.37 of the radius of Jupiterand it is about 2.8 times more massive than the gas giant. TOI-778 b revolves around the host every 4.63 days at a distance of about 0.06 AU. From him. The planet's equilibrium temperature is estimated to be around 1561 Kelvin (1287.85 °C). Based on the parameters of TOI-778 b, astronomers have classified it as a hot Jupiter.

Phase model of the light curve of TOI-778 b according to TESS data.
Image Credit & Copyright: Clark et al., 2022

The parent star TOI-778 rotates withrotation speed at the level of about 40 km/s. It is about 71% larger and 40% more massive than the Sun. The researchers estimate that the age of TOI-778 is about 1.95 billion years, and the effective temperature is about 6700–6800 K (6426.85–6526.85 °C). The distance to the star was about 528 light years.

The study also showed that the orbit of TOI-778 bis close to coincidence with the stellar equator, and the inclination of the parent star to the sky is 19 degrees. Astronomers believe that the planet migrated "gradually" across the disk of its host star, rather than reaching its current location in more "chaotic ways".

TESS surveys about 200,000 of the brightest starsnear the Sun in order to search for transiting exoplanets. More than 6,100 exoplanet candidates (TESS Objects of Interest, or TOI) have been identified so far, 282 of them have been confirmed.

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