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- W3100143954 abstract "Stellar heating causes atmospheres of close-in exoplanets to expand and escape. These extended atmospheres are difficult to observe because their main spectral signature - neutral hydrogen at ultraviolet wavelengths - is strongly absorbed by interstellar medium. We report the detection of the near-infrared triplet of neutral helium in the transiting warm Neptune-mass exoplanet HAT-P-11b using ground-based, high-resolution observations. The helium feature is repeatable over two independent transits, with an average absorption depth of 1.08+/-0.05%. Interpreting absorption spectra with 3D simulations of the planet's upper atmosphere suggests it extends beyond 5 planetary radii, with a large scale height and a helium mass loss rate =< 3x10^5 g/s. A net blue-shift of the absorption might be explained by high-altitude winds flowing at 3 km/s from day to night-side." @default.
- W3100143954 created "2020-11-23" @default.
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- W3100143954 date "2018-12-21" @default.
- W3100143954 modified "2023-10-01" @default.
- W3100143954 title "Spectrally resolved helium absorption from the extended atmosphere of a warm Neptune-mass exoplanet" @default.
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- W3100143954 doi "https://doi.org/10.1126/science.aat5879" @default.
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