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Two Massive Planets Orbiting Old Sun-Like Stars

20 Dec 2015, 22:00 UTC
Two Massive Planets Orbiting Old Sun-Like Stars
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Figure 1: Artist’s impression of a gas giant planet.Ciceri et al. (2015) present the discovery of two massive hot-Jupiters in close-in orbits around old Sun-like stars. The two planets are identified as HATS-15b and HATS-16b. HATS-15b has 2.17 ± 0.15 times the mass of Jupiter, 1.105 ± 0.040 times the radius of Jupiter and it orbits a G9V star in 1.75 days. HATS-16b has 3.27 ± 0.19 times the mass of Jupiter, 1.30 ± 0.15 times the radius of Jupiter and it orbits a G3V star in 2.69 days. For comparison, the Sun is a G2V star.With the masses and radii of both planets known, the density of HATS-15b is 1.97 g/cm³ and the density of HATS-16b is 1.86 g/cm³. Interior models suggest that HATS-15b does not possess a core while HATS-16b probably has a low-mass core. Being so close to their parent stars, both planets have very high equilibrium temperatures and are classified as hot-Jupiters. HATS-15b has a temperature of 1500 K and HATS-16b has a temperature of 1600 K.The parent star of HATS-16b has a relatively short rotation period of just 12 days. Such a short rotation period might be the result of tidal interactions between HATS-16b and ...

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