Astronomers have discovered four new giant exoplanets,HIP8541, HIP74890, HIP84056 and HIP95124, with masses from 2.4 to 5.5 times that of Jupiter, orbiting stars much bigger than our Sun.
The newly detected worlds are enormous and have very long orbital periods ranging from nearly two to slightly more than four Earth years.
The researchers, led by Matias Jones of the Pontifical Catholic University of Chile, used the 1.5 m telescope at the Cerro Tololo Inter-American Observatory and the 2.2 m telescope at La Silla observatory in Chile, and the 3.9 m Anglo-Australian telescope in Australia.
HIP8541b is the most massive of the newly found planets. With a mass of about 5.5 Jupiter masses, this exoplanet also has a much longer orbital period than the other three worlds, equal to 1,560 days.
Its parent star is slightly more massive than the Sun and has a radius of nearly eight solar radii.
HIP74890b and HIP84056b are very similar in terms of mass and orbital period. The mass of HIP74890b is estimated to be 2.4 Jupiter masses.
HIP84056b has an orbital period lasting nearly 819 days — about three fewer days than the other planet.
Their host stars are also of similar mass and size, about 1.7 the mass of the Sun, with a radius of 5.03 (HIP84056) and 5.77 (HIP74890) solar radii.
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