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    rocky exoplanet GJ 486 tagged posts

    Webb finds Water Vapor, but is it from a Rocky Planet or its Star?

    May 3, 2023, Categories  Astronomy/Space

    Graph showing the transmission spectrum of exoplanet GJ486b. The X-axis shows amount of light blocked, and the Y-axis shows wavelength of light. An orange wave begins at the upper left and a blue at the lower left. White dots show Webb data.
    This graphic shows the transmission spectrum obtained by Webb observations of rocky exoplanet GJ 486 b. The science team’s analysis shows hints of water vapor; however, computer models show that the signal could be from a water-rich planetary atmosphere (indicated by the blue line) or from starspots from the red dwarf host star (indicated by the yellow line). The two models diverge noticeably at shorter infrared wavelengths, indicating that additional observations with other Webb instruments will be needed to constrain the source of the water signal.
    Credits: NASA, ESA, CSA, Joseph Olmsted (STScI)

    GJ486b is about 30% larger than the Earth and three times as massive, which means it is a rocky world with stronger gravity than Earth. It orbits a red dwarf star in just under 1...

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