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Optical Absorbers in the Atmosphere of WASP-98b

27 Jun 2016, 22:00 UTC
Optical Absorbers in the Atmosphere of WASP-98b
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WASP-98b is a rare example of a transiting hot-Jupiter in orbit around a metal-poor main-sequence star. Since “metal” in this context refers to elements heavier than hydrogen and helium, how metal-rich or metal-poor a star is depends on its abundance of such elements. Based on the core-accretion model of planet formation, Jupiter-like planets are more common around metal-rich stars. The metallicity of the host star of WASP-98b is only one-third the metallicity of the Sun. It is very rare for a Jupiter-like planet to form around a star with such a low metallicity.Figure 1: Artist’s impression of a gas giant planet.WASP-98b orbits very close to its host star, with an orbital period of only 2.96 days. The planet is estimated to have ~0.8 times the mass and ~1.1 times the radius of Jupiter, and an equilibrium temperature of about 1180 K. New observations of two transit events of WASP-98b were done in four filters: g' (450.0 nm), r' (622.0 nm), i' (764.0 nm) and z' (898.9 nm). The observations show that WASP-98b appears larger in size when observed at g', r' and i' than at z'. The maximum difference is between r' and z', and it translates to about 5.5 ...

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