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Exoplanety
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Exoplanety

Exoplanety jsou světy obíhající jiné hvězdy, podobně jako Země obíhá Slunce. Zatímco v naší sluneční soustavě máme osm planet vázaných na jednu centrální hvězdu, exoplanety rozšiřují tento koncept na celý vesmír. Mohou to být plynní obři jako Jupiter nebo skalnaté světy podobné naší Zemi. Astronomové jich objevili již tisíce, přičemž každá hvězda na noční obloze může být potenciálním „Sluncem“ pro své vlastní oběžnice. Tato tělesa nám pomáhají pochopit, zda je naše uspořádání planet běžné, nebo unikátní.
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Latest news from Exoplanety

Atmospheric composition of hot Jupiter KELT-2A b reveals chemical history
iconToday
iconHvězdy | Exoplanety | Horký Jupiter | Atmosféry plane
Image: Atmospheric composition of hot Jupiter KELT-2A b reveals chemical history
The hot Jupiter KELT-2A b features an atmosphere containing measurable amounts of water vapor. By observing the planet across five nights, investigators detected water with high certainty. This finding builds on previous research, providing a clearer picture of the chemical elements present in the gas giant's outer layers. While researchers searched for carbon monoxide, the current data remains inconclusive, though hints of its presence appeared near the expected planetary velocity. To determ...
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Periodic transit timing variations measured for Neptune-like planet HAT-P-18 b
iconToday
iconHvězdy | Exoplanety | Superzemě | Horký Jupiter | Vesmírný dalekohled Jamese Webb
Image: Periodic transit timing variations measured for Neptune-like planet HAT-P-18 b
New observations from the James Webb Space Telescope show periodic transit timing variations in the Neptune-like planet HAT-P-18 b. The data indicates an orbital timing shift of 92.9 seconds, providing fresh insights into the dynamics of this distant system....
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Orbital and atmospheric evolution of the mini-Neptune TOI-2257 b
iconToday
iconHvězdy | Exoplanety | Červení trpaslíci | Superzemě | Atmosféry planet | TESS
Image: Orbital and atmospheric evolution of the mini-Neptune TOI-2257 b
The exoplanet TOI-2257 b orbits its star once every 35 days with a high eccentricity. New models suggest its atmospheric and orbital fate depends on whether it is a gas-rich mini-Neptune or a rocky super-Earth. Higher eccentricity would confirm a gaseous nature....
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Massive brown dwarf HD 203771 b confirmed in eccentric orbit around orange dwarf
iconYesterday
iconHvězdy | Exoplanety | Oranžový trpaslík | Hnědí trpaslíci
Image: Massive brown dwarf HD 203771 b confirmed in eccentric orbit around orange dwarf
Massive brown dwarf HD 203771 b confirmed in an eccentric orbit around an orange dwarf star. New mass measurements place the companion at approximately 70 times the mass of Jupiter, revealing insights into how brown dwarfs migrate inward over time....
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Escaping atmosphere of the ultrahot Jupiter KELT-18 b reveals metastable helium
iconYesterday
iconHvězdy | Exoplanety | Horký Jupiter | Atmosféry plane
Image: Escaping atmosphere of the ultrahot Jupiter KELT-18 b reveals metastable helium
Researchers have detected metastable helium escaping from the ultrahot Jupiter KELT-18 b. This confirms the massive gas giant is undergoing active atmospheric photoevaporation. KELT-18 b is now the most massive planet found with this specific helium signature....
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