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KOI 408.05 is a Warm Neptune in the Habitable Zone

11 Jun 2016, 22:00 UTC
KOI 408.05 is a Warm Neptune in the Habitable Zone
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Kunimoto et al. (2016) present the discovery of a warm Neptune in the habitable zone around a Sun-like star. This planet is identified as KOI 408.05. It orbits a host star with ~0.963 times the mass and ~0.931 times the radius of the Sun, and the effective temperature of the host star is ~5862 K. The planet's orbital period is 637 days and it is 1.472 times further from its host star than Earth is from the Sun, in a Mars-like orbit. KOI 408.05 is estimated to receive ~60 percent the amount of flux Earth gets from the Sun and its equilibrium temperature is predicted to be 252 K. For comparison, Earth's equilibrium temperature is 255 K.The transit of KOI 408.05 in front of its host star has 1555 ppm (parts-per-million) transit depth and transit duration of about 16.7 hours. From the transit depth, the size of KOI 408.05 is estimated to be ~4.92 times the radius of Earth. With these properties, KOI 408.05 is a warm Neptune-sized planet in the habitable zone of its host star. Although KOI 408.05 is expected to be like Neptune with a think hydrogen-helium envelope, a large moon in orbit around it can potentially ...

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