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Astronomers discover 'mega-Earth' GJ 523b, 23 times Earth's mass but defies formation models

Study details GJ 523b's anomalous density and challenge to planet formation theory

2 Aug 19 6:00 AM · 57d ago · 1 article · 2 posts · 2 sources · development 2 of 2

Detailed analysis shows GJ 523b has a mass of 23.5 times Earth's, a radius 2.55 times larger, and unusually high density of 126.82 grams per cubic inch. The planet orbits its star every 17.75 days and defies expectations: at its mass, it should have accumulated a substantial hydrogen and helium envelope like Jupiter or Saturn, but instead remains predominantly rocky.

Study details GJ 523b's anomalous density and challenge to planet formation theory
Space.com

“This isn't what we expected at all. Dense planets like this aren't uncommon, but they're usually small rocky planets similar to Earth or Mercury. This planet is two and a half times bigger than the Earth.”

Max Kroft, lead author

Max Kroft Lead author of the studyWisconsin Center for Origins Research (WiCOR) Discovering research institutionUniversity of Wisconsin–Madison Research institutionNASA's Transiting Exoplanet Survey Satellite (TESS) Space telescope instrument

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What was reported 1 claim about this development

  1. 4 outlets Astronomers discover a giant, rocky 'mega-Earth' 23 times more massive than our planet

    first by Space.com, 57d ago · also Inshorts, NewsBytes, Space

    2 more headlines

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