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Highly-Irradiated Compact Hot Jupiters

14 Mar 2015, 22:00 UTC
Highly-Irradiated Compact Hot Jupiters
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The HATSouth survey is a network of 6 telescopes designed to detect transiting exoplanets around relatively bright stars visible from the Southern Hemisphere. As part of the survey, Brahm et al. (2015) report the discovery of two highly-irradiated hot Jupiters that appear relatively compact in comparison with other hot Jupiters with similar irradiation levels.The two hot Jupiters are HATS-9b and HATS-10b. HATS-9b is in a 1.9 day orbit around an old, slightly evolved star with similar mass as the Sun. The planet has 0.837 times the mass and 1.065 times the radius of Jupiter. The other hot Jupiter, HATS-10b, is in a 3.3 day orbit around a Sun-like star. HATS-10b has 0.53 times the mass and 0.97 times the radius of Jupiter.Figure 1: Artist’s impression of a giant planet.Despite the intense irradiation due to their closeness to their host stars, HATS-9b and HATS-10b do not appear inflated. When plotted on a temperature versus radius diagram, both planets deviate from the known correlation between a planet’s radius and the intensity of irradiation it receives. HATS-9b and HATS-10b should have 1.36 and 1.22 times the radius of Jupiter, respectively. However, their observed sizes are 3σ and 5σ below these values. Both HATS-9b ...

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