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There are three inner planets and an outer gas giant in the habitable zone. The innermost planet, WASP-47e, is a large terrestrial planet of 6.83 Earth masses and 1.8 Earth radii; the hot Jupiter, b, is little heavier than Jupiter, but about 12.63 Earth radii; a final hot Neptune, c, is 15.2 Earth masses and 3.6 Earth radii. [ 34 ]
The term gas giant was coined in 1952 by the science fiction writer James Blish [6] and was originally used to refer to all giant planets.It is, arguably, something of a misnomer because throughout most of the volume of all giant planets, the pressure is so high that matter is not in gaseous form. [7]
The surface temperature is 10,170 K (9,897 °C; 17,846 °F), unusually hot for a star with a transiting planet. Prior to the discovery of KELT-9b, only six A-type stars were known to have planets, of which the warmest, WASP-33 , is significantly cooler at 7,430 K (7,157 °C; 12,914 °F); no B-type stars were previously known to host planets.
It is a hot gas giant planet with a high temperature of 900 °C. [6] The exoplanet orbits very close (7 million km) to WASP-39, its host star, every 4 days. [1] WASP-39b is also notable for having an extremely low density, near that of WASP-17b. While WASP-17b has a density of 0.13 ± 0.06 g/cm 3, WASP-39b has a slightly higher density of 0.18 ...
For the very hottest gas giants, with temperatures above 1400 K (2100 °F, 1100 °C) or cooler planets with lower gravity than Jupiter, the silicate and iron cloud decks are predicted to lie high up in the atmosphere. The predicted Bond albedo of a class V planet around a Sun-like star is 0.55, due to reflection by the cloud decks.
The gas giants in our solar system — Jupiter, Saturn, Uranus and Neptune — are much denser. ... This giant gas planet is as fluffy and puffy as cotton candy. MARCIA DUNN.
A giant planet, sometimes referred to as a jovian planet (Jove being another name for the Roman god Jupiter), is a diverse type of planet much larger than Earth. Giant planets are usually primarily composed of low- boiling point materials ( volatiles ), rather than rock or other solid matter, but massive solid planets can also exist.
HAT-P-12b is a H/He-dominated gas giant planet with a core mass of 11.3 +2.6 −2.1 M 🜨 and is moderately irradiated by its low-metallicity host star. [ 3 ] Therefore, HAT-P-12b is most likely an H/He-dominated planet with a core of perhaps ~10 M 🜨 , and a total metal fraction of ~15%.