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A Jupiter-Like Circumbinary Planet

3 Dec 2015, 22:00 UTC
A Jupiter-Like Circumbinary Planet
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Kostov et al. (2015) present the discovery of the largest and longest-period transiting circumbinary planet. This planet is identified as KOI-2939b and it was detected using data from NASA’s Kepler space telescope. The planet orbits a pair of stars that revolve around each other every 11.26 days. The primary star has 1.2207 ± 0.0112 times the mass and 1.7903 ± 0.0055 times the radius of the Sun, and it has a temperature of 6210 ± 100 K. The secondary star has 0.9678 ± 0.0039 times the mass and 0.9663 ± 0.0057 times the radius of the Sun, and it has a temperature of 5770 ± 125 K. The primary star is ~5 times more luminous than the secondary star. This binary system is estimated to be 4.4 ± 0.25 billion years old.Figure 1: Artist’s impression of a gas giant planet with a large terrestrial-size moon.KOI-2939b is a gas giant planet similar to Jupiter. It has 1.52 ± 0.65 times the mass and 1.06 ± 0.01 times the radius of Jupiter (i.e. 483 ± 206 times the mass and 11.9 ± 0.1 times the radius of Earth). The next largest transiting circumbinary planet is Kepler-16b, with 0.75 times the radius of ...

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