HAT-P-11b Has Strong Magnetosphere, Metal-Poor Atmosphere astronomy space science
Using ultraviolet data from the NASA/ESA Hubble Space Telescope, astronomers have detected carbon ions — charged particles that interact with magnetic fields — in the magnetosphere of the Neptune-sized exoplanet HAT-P-11b and found that the metallicity of its atmosphere is lower than expected.
“A strong magnetic field on a planet like Earth can protect its atmosphere and surface from direct bombardment of the energetic particles that make up the solar wind.” Hubble’s observations of an extended region of charged carbon particles that surround the exoplanet HAT-P-11b and streaming away in a long tail are best explained by magnetic field, the first such discovery on a planet outside of our Solar System. The planet is depicted as the small circle near the center. Carbon ions fill an immense region it. In the magnetotail, not shown to its full extent, ions escape at the observed average speeds of about 161,000 kmh.
“Just like Earth’s magnetic field and its immediate space environment interact with the impinging solar wind, which consists of charged particles traveling at about 1.45 million kmh , there are interactions between HAT-P-11b’s magnetic field and its immediate space environment with the solar wind from its host star, and those are very complex,” Dr. Ballester said.
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