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A hot Neptune is a type of giant planet with a mass similar to that of Neptune or Uranus orbiting close to its star, normally within less than 1 AU. [1] The first hot Neptune to be discovered with certainty was Gliese 436 b (Awohali) in 2007 , an exoplanet about 33 light years away.
Gliese 436 b / ˈ ɡ l iː z ə / (sometimes called GJ 436 b, [7] formally named Awohali [2]) is a Neptune-sized exoplanet orbiting the red dwarf Gliese 436. [1] It was the first hot Neptune discovered with certainty (in 2007) and was among the smallest-known transiting planets in mass and radius, until the much smaller Kepler exoplanet discoveries began circa 2010.
Vega b, reported in 2021, is a candidate ultra-hot Neptune with a mass of ≥21.9 M E that revolves around Vega every 2.43 days, a mere 0.04555 AU (6,814,000 km) from its luminous host star. The equilbrium temperature of the planet is a white-hot 3,250 K (2,980 °C; 5,390 °F) assuming a Bond albedo of 0.25, which, if confirmed, would make it ...
The relative "hot spot" is due to Neptune's axial tilt, which has exposed the south pole to the Sun for the last quarter of Neptune's year, or roughly 40 Earth years. As Neptune slowly moves towards the opposite side of the Sun, the south pole will be darkened and the north pole illuminated, causing the methane release to shift to the north pole.
Hot Neptunes are Neptune-class extrasolar planets that orbit close to their parent stars, typically less than 1 AU. Pages in category "Hot Neptunes" The following 43 pages are in this category, out of 43 total.
As the official start of astronomical summer got underway on Thursday, June 20, a widespread heat wave across the eastern United States continued to make it feel comparable to the dog days of ...
The placement of the solar system's gas giants can be explained by the Grand tack hypothesis. [3] The defining differences between a very low-mass brown dwarf (which can have a mass as low as roughly 13 times that of Jupiter [4]) and a gas giant are debated. [5] One school of thought is based on formation; the other, on the physics of the ...
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