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Narrow ring of gas found near the young star HD 152384
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iconHvězdy | Mladé hvězdné objekty | Vznik plane
Image: Narrow ring of gas found near the young star HD 152384
The young star HD 152384, located in the Sco-Cen association, possesses a structure that mimics a debris disk, revealing a thin ring of gas circulating near the star. This gaseous ring consists of refractory elements - substances that remain solid at high temperatures - such as iron, magnesium, silicon, and calcium. The presence of this material so close to the star suggests a secondary origin, likely resulting from the ongoing collisions of rocky bodies orbiting the star. This system is a rare ...
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Atmospheric composition of hot Jupiter KELT-2A b reveals chemical history
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iconHvězdy | Exoplanety | Horký Jupiter | Atmosféry plane
Image: Atmospheric composition of hot Jupiter KELT-2A b reveals chemical history
New observations of hot Jupiter KELT-2A b confirm water vapor in its atmosphere. The planet shows a carbon-to-oxygen ratio similar to its host star but with overall lower metallicity, suggesting a complex migration history from far out in its star system....
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Periodic transit timing variations measured for Neptune-like planet HAT-P-18 b
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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
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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
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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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