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K2-33b
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K2-33b
K2-33b (also known by its EPIC designation EPIC 205117205.01) is a very young super-Neptune exoplanet, orbiting the pre-main-sequence star K2-33. It was discovered by NASA's Kepler space telescope on its "Second Light" mission. It is located about 453 light-years (139 parsecs) away from Earth in the constellation of Scorpius. The exoplanet was found by using the transit method, in which the dimming effect that a planet causes as it crosses in front of its star is measured.
K2-33b is among the youngest known exoplanets, at 9.3 million years old.
K2-33b is a super-Neptune, an exoplanet that has a mass and radius larger than that of Neptune. It has an equilibrium temperature of 850 K (577 °C; 1,070 °F). It has a radius of 5.04 R🜨. The exoplanet's mass is not well constrained, with an upper limit mass of 3.6 MJ. Its true mass is likely much lower, at around 7-16 M🜨 in a ringed scenario, or even 3-5 M🜨 in a non-ringed scenario. Thus, in terms of mass it may be better described as a sub-Neptune.
By 2022, the atmosphere of K2-33b was found to be hazy, without any noticeable molecular bands in transmission spectrum. Given the planetary radius and temperature, atmosphere is likely to contain an abundant carbon monoxide and dense tholin haze.
The planet orbits an (M-type) pre-main-sequence star named K2-33. The star has a mass of 0.54 M☉ and a radius of 1.05 R☉. It has a surface temperature of 3540 K and is 9.3 million years old. In comparison, the Sun is 4.6 billion years old and has a surface temperature of 5778 K. It has about the same amount of metals as the Sun, with a metallicity ([Fe/H]) of 0. Its luminosity (L☉) is 15% that of the Sun.
The star's apparent magnitude, or how bright it appears from Earth's perspective, is 14.3. Therefore, it is too dim to be seen with the naked eye.
K2-33b orbits its host star with an orbital period of 5.424 days at a distance of 0.049 AU (compared to the distance of Mercury from the Sun, which is about 0.38 AU). The planet likely receives about 125 times as much sunlight that Earth does from the Sun.
A 2022 study found evidence that K2-33b may be surrounded by a dusty ring system. This could be confirmed by future observations with the James Webb Space Telescope.
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K2-33b
K2-33b (also known by its EPIC designation EPIC 205117205.01) is a very young super-Neptune exoplanet, orbiting the pre-main-sequence star K2-33. It was discovered by NASA's Kepler space telescope on its "Second Light" mission. It is located about 453 light-years (139 parsecs) away from Earth in the constellation of Scorpius. The exoplanet was found by using the transit method, in which the dimming effect that a planet causes as it crosses in front of its star is measured.
K2-33b is among the youngest known exoplanets, at 9.3 million years old.
K2-33b is a super-Neptune, an exoplanet that has a mass and radius larger than that of Neptune. It has an equilibrium temperature of 850 K (577 °C; 1,070 °F). It has a radius of 5.04 R🜨. The exoplanet's mass is not well constrained, with an upper limit mass of 3.6 MJ. Its true mass is likely much lower, at around 7-16 M🜨 in a ringed scenario, or even 3-5 M🜨 in a non-ringed scenario. Thus, in terms of mass it may be better described as a sub-Neptune.
By 2022, the atmosphere of K2-33b was found to be hazy, without any noticeable molecular bands in transmission spectrum. Given the planetary radius and temperature, atmosphere is likely to contain an abundant carbon monoxide and dense tholin haze.
The planet orbits an (M-type) pre-main-sequence star named K2-33. The star has a mass of 0.54 M☉ and a radius of 1.05 R☉. It has a surface temperature of 3540 K and is 9.3 million years old. In comparison, the Sun is 4.6 billion years old and has a surface temperature of 5778 K. It has about the same amount of metals as the Sun, with a metallicity ([Fe/H]) of 0. Its luminosity (L☉) is 15% that of the Sun.
The star's apparent magnitude, or how bright it appears from Earth's perspective, is 14.3. Therefore, it is too dim to be seen with the naked eye.
K2-33b orbits its host star with an orbital period of 5.424 days at a distance of 0.049 AU (compared to the distance of Mercury from the Sun, which is about 0.38 AU). The planet likely receives about 125 times as much sunlight that Earth does from the Sun.
A 2022 study found evidence that K2-33b may be surrounded by a dusty ring system. This could be confirmed by future observations with the James Webb Space Telescope.
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