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KELT 9b

Size

KELT-9b is about 2.8 times the size of Jupiter, making it one of the larger gas giants discovered. Its substantial size contributes to its unique physical characteristics.

Distance from Earth

This exoplanet is situated approximately 650 light-years away in the constellation Cygnus. Its distance poses challenges for observation but also provides a rich opportunity for studying exoplanetary atmospheres.

Surface and Athmosphere

KELT-9b experiences extreme temperatures, with estimates suggesting surface temperatures exceeding 4,300 K (around 4,000 °C or 7,200 °F). This extreme heat is a result of its close proximity to its host star, which is hotter than our Sun. The atmosphere may contain vaporized metals and experience significant atmospheric loss due to thermal escape.

Inside

KELT-9b's internal structure is hypothesized to be similar to that of other gas giants, with a possible core of heavy elements (rock and metal) surrounded by layers of gaseous hydrogen and helium. The extreme temperatures and close proximity to its host star may cause significant atmospheric escape, affecting its structure over time. The high energy input from the star suggests that the planet may have a more extended atmosphere, with vaporized metals likely present due to the intense heat.

Special features

KELT-9b serves as a crucial case study for understanding the effects of high temperatures on planetary atmospheres. Its unique conditions provide insights into processes such as atmospheric escape and the behavior of gases in extreme environments.

Discovery

Discovery Method: Transit Method

Year Discovered: 2017

Details: KELT-9b was discovered by the KELT (Kilodegree Extremely Little Telescope) survey, which uses the transit method to find exoplanets. The observations identified the periodic dimming of its host star as KELT-9b passed in front, providing data on its size, orbit, and unique thermal characteristics.

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