(ORDO NEWS) — Using the NASA Transiting Exoplanet Survey Satellite (TESS), an international team of astronomers has discovered a new exoplanet that is a hot Jupiter.
The planet, which is almost three times as massive as Jupiter, orbits the star TOI-778.
A team of researchers led by Jake T. Clark of the University of South Queensland recently reported that a transit signal has been detected in the light curve of a rapidly rotating F3V dwarf star 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 discovered planet TOI-778 b has a radius equal to 1.37 Jupiter radii. It is about 2.8 times more massive than the largest planet in the solar system.
TOI-778 b orbits its parent star every 4.63 days at a distance of about 0.06 AU. The planet’s equilibrium temperature is estimated to be around 1561 K.
Astronomers have classified the planet as a hot Jupiter, but TOI-778 b appears somewhat bloated compared to other hot Jupiters of similar mass.
The rotation speed of the star TOI-778 is almost 40 km/s. The star is about 71% larger and 40% more massive than the Sun.
The researchers calculated that TOI-778 is about 1.95 billion years old, and its effective temperature is about 6700-6800 K. The star is about 528 light-years away.
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