Latest astronomy noticias

The three-planet system orbiting the young orange dwarf K2-233 shows signs of dramatic atmospheric change. New analysis of radial velocity data confirms that these worlds are undergoing significant mass loss, with planet K2-233 d expected to shrink into either a thin-envelope sub-Neptune or a bare super-Earth over billions of years. Meanwhile, the inner planets K2-233 b and c are likely dominated by iron cores....

Observations of the ultra-hot Jupiter WASP-76 b show evidence of magnesium escaping from its upper atmosphere. By analyzing near-ultraviolet light, researchers identified high-altitude gas extending beyond the planet's gravitational influence. This finding, consistent with hydrodynamic escape, indicates that the planet is losing mass without requiring unusual chemical compositions....

Researchers have performed a detailed characterization of the exoplanet TOI-2211 b, a super-Earth orbiting an orange dwarf star. By combining data from multiple telescopes, the study identified the planet as a promising candidate for a hot water world. Additionally, the team detected a second, non-transiting planetary candidate within the same system, providing new insights into the architecture of this distant star system....

Researchers have measured the orbital alignment of a Neptune-mass planet around the hot star WASP-195. By observing the Rossiter-McLaughlin effect, the study confirms that the planet maintains a spin-orbit alignment, providing insight into the migration history of this specific planetary system and helping to fill a data gap regarding smaller planets orbiting stars hotter than the sun....

A new warm Jupiter named HD 715 b has been confirmed orbiting the bright subgiant star HD 715. Identified initially through a single transit event captured by the TESS mission, follow-up observations have revealed the planet's orbital characteristics. This system is particularly notable because the host star is among the most massive known to harbor a transiting warm Jupiter, providing new data on orbital diversity....

Advanced statistical methods help clarify planetary signals hidden within precise radial velocity data. By systematically testing how individual measurements influence a model, researchers have refined the mass estimate of HD 119130 b, clarified the orbital architecture of the Gliese 4276 system, and confirmed the three-planet structure orbiting Gliese 357 by testing for predictive consistency....

Observations of the disintegrating rocky planet BD+05 4868 b reveal potential signatures of oxygen escaping from its surface. By analyzing the planet during transit, the recorded data suggest the presence of a mineral-vapor outflow. This finding provides insights into how intensely irradiated rocky worlds lose their material through evaporation processes....

Researchers have analyzed the atmospheres of eight sub-Neptune planets orbiting Red dwarf stars using the James Webb Space Telescope. By studying the mean molecular weight of their gaseous envelopes, the team identified a new category of intermediate planets, dubbed hybrid worlds, which do not fit the traditional definitions of simple gas-enveloped rocks or water-rich worlds formed in the outer solar system....

Observations of the protoplanetary disc surrounding the star HD 139614 reveal complex light patterns caused by an inclined planet. By analyzing scattered-light images, researchers identified shifting brightness in the inner ring and a distinct spiral structure. A physical model suggests that a tilted planet forces inner parts of the disc to warp and precess, casting long-lasting shadows across the outer regions....