Tag

Mega Earth

All articles tagged with #mega earth

astronomy1 month ago•8 min saved

Dense Mega-Earth Gliese 523b Defies Planet Formation Theories with Polar Orbit

Astronomers confirm Gliese 523b—a dense meg-eath about 2.55 Earth radii and 23.5 Earth masses (density ~7.8 g/cm3) orbiting the young, ~169‑million‑year‑old star Gliese 523 every 17.75 days on a highly inclined, near-polar orbit (inclination ≥71°). With little or no atmosphere, it challenges standard formation models. The planetary nature was established using NEID radial‑velocity data and TESS transits. Its enigmatic characteristics have scientists exploring scenarios such as atmospheric stripping, warped protoplanetary disks, undetected outer companions, or giant impacts that prevented thick atmosphere formation.

via Sci.News|

#astronomy #exoplanet #gliese-523b

space1 month ago•3 min saved

Dense Mega-Earth GJ 523b Defies Conventional Planet Formation

Astronomers confirm GJ 523b, a rock-dominated mega-Earth about 23 Earth masses and 2.5 Earth radii in a 170-million-year-old system, orbiting its star every 17.75 days. Its extreme density and thin atmosphere challenge standard models that would normally push such a core to become a gas giant, prompting theories like atmospheric stripping from stellar heat or a head-on collision of rocky protoplanets. This discovery provides a rare glimpse into how ultra-dense worlds form and evolve.

via geekspin|

#exoplanet #gj-523b #mega-earth

space-and-astronomy1 month ago•48 min saved

Dense mega-Earth GJ 523b challenges planetary norms with thin atmosphere

Astronomers have identified GJ 523b, a dense 'mega-Earth' about 2.5 times Earth in size and around 23 times as massive, with a surprisingly thin atmosphere. Discovered by NASA’s TESS and examined with the WIYN telescope and the James Webb Space Telescope, the planet’s high density and lack of a thick gaseous envelope defy simple formation models, leading researchers to speculate that extreme heat or a past planetary collision stripped away much of its atmosphere and to push for a clearer definition of the Mega-Earth category.

via Yahoo|

#atmosphere-loss #exoplanets #gj-523b

space1 month ago•159 min saved

GJ 523b: A colossal rocky world defying formation expectations

Astronomers have identified GJ 523b, an unusually dense exoplanet about 2.5 times Earth’s radius and roughly 23–24 times Earth’s mass, making it a so‑called mega‑Earth with a predominantly rocky composition and little atmosphere. Its high density challenges standard planet‑formation models that predict gas envelopes once cores reach ~20 Earth masses; explanations include atmospheric loss or a giant‑impact origin. The planet orbits its star every 17.75 days in a relatively young system (~170 million years old), with the discovery arising from NASA’s TESS data and ground‑based WIYN follow‑up observations.

via Space|

#density #exoplanet #gj-523b