Orbiting a variable star discovered “hot Jupiter”

Astronomers have discovered a new “hot Jupiter”, orbiting stars like the T Tauri, known as the TAP 26. This newly discovered distant planet, the designation of the TAP 26 b has a mass of 66 percent exceeding the mass of Jupiter, and orbits the parent planet in an orbit with a period of approximately 10 days.

Located at a distance of roughly 480 light years away, the star TAP 26 belongs to the class of variable stars are pre-main sequence, called Tau Calf. Star TAP 26 has a mass about equal to the mass of the Sun, and a radius of about 1.17 solar radii. The age of this star is estimated at approximately 17 million years.

In the new study, a team of astronomers led by Yu Liang (Liang Yu) from the University of Toulouse, France, watched star TAP 26 in a few months with the 3.6-meter telescope Canada-France-Hawaii, located in Hawaii. Using three different methods, the researchers were able to detect the signal indicating the presence of the planet in the spectrum of the star.

According to this study the newly discovered planet has a mass 1.66 mass of Jupiter and is drawn at a distance of about 0.1 astronomical units (1 a.e. = the distance from the earth to the Sun) from the parent star. A small orbital period, the mass of the giant and the proximity of the planet to the star has allowed to classify the planet TAP 26 b as a “hot Jupiter”. The so-called “hot Jupiters” are giant gas planets, similar in characteristics with the largest planet in the Solar system, but with an orbital period of not more than 10 days. The surface of such planets heat up to high temperatures, since they rotate at relatively short distance from the parent star.

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