Using NASA's Transiting Exoplanet Survey Satellite (TESS), an international team of astronomers
The transit signal was identified on the curvethe brilliance of a 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-778b orbits its host every 4.63 days at a distance of about 0.06 AU. From him. The planet's equilibrium temperature is estimated to be approximately 1561 Kelvin (1287.85 °C). Based on the parameters of TOI-778 b, astronomers classified it as a hot Jupiter.
Phase model of the TOI-778 b light curve according to TESS data.
Image Credit & Copyright: Clark et al., 2022
Parent star TOI-778 rotateswith a rotation speed of about 40 km/s. It is about 71% larger and 40% more massive than the Sun. Researchers estimate that TOI-778 is about 1.95 billion years old and has an effective temperature of about 6700–6800 K (6426.85–6526.85 °C). The distance to the star was approximately 528 light years.
The study also found that the orbit of TOI-778 bis close to coinciding with the stellar equator, and the inclination of the parent star to the sky is 19 degrees. Astronomers believe the planet migrated “sedately” across the disk of its host star, rather than reaching its current location through more “chaotic paths.”
TESS surveys about 200,000 brightest starsnear the Sun in order to search for transiting exoplanets. To date, more than 6,100 candidate exoplanets (TESS Objects of Interest, or TOI) have been identified, 282 of which are confirmed.
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