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Gj 523b

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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