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Three Temperate Neptunes Orbiting Sun-Like Stars

12 Jul 2016, 22:00 UTC
Three Temperate Neptunes Orbiting Sun-Like Stars
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Fulton et al. (2016) present the discovery of three moderately-irradiated, roughly Neptune-mass planets orbiting three relatively nearby Sun-like stars that are located no more than 80 light years away. The three planets are identified as HD 42618 b, HD 164922 c and HD 143761 c. All three planets were detected using the radial velocity method.HD 42618 b has at least 15.4 ± 2.4 times the mass of Earth. It orbits its host star at ~0.55 AU and its orbital period is 149 days. HD 42618 b receives ~3.2 times the irradiation Earth gets from the Sun and its equilibrium temperature is ~337 K.HD 164922 c has at least 12.9 ± 1.6 times the mass of Earth. It orbits its host star at ~0.34 AU and its orbital period is 75 days. HD 164922 c receives ~6.3 times the irradiation Earth gets from the Sun and its equilibrium temperature is ~401 K. Exterior to the orbit of HD 164922 c is a previously known Saturn-mass planet.HD 143761 c has at least 25 ± 2 times the mass of Earth. It orbits its host star at ~0.41 AU and its orbital period is 39 days. HD 143761 c receives ~9.9 times the ...

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