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American Association for the Advancement of Science, Science, 6421(362), p. 1388-1391, 2018

DOI: 10.1126/science.aat5348

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Ground-based detection of an extended helium atmosphere in the Saturn-mass exoplanet WASP-69b

Journal article published in 2018 by Lisa Nortmann ORCID, Enric Pallé, Michael Salz, Jorge Sanz-Forcada ORCID, Evangelos Nagel ORCID, F. Javier Alonso-Floriano ORCID, Stefan Czesla, Fei Yan ORCID, Guo Chen ORCID, Ignas A. G. Snellen ORCID, Mathias Zechmeister ORCID, Jürgen H. M. M. Schmitt ORCID, Manuel López-Puertas ORCID, Núria Casasayas-Barris, Florian F. Bauer ORCID and other authors.
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

Hot gas giant exoplanets can lose part of their atmosphere due to strong stellar irradiation, and these losses can affect their physical and chemical evolution. Studies of atmospheric escape from exoplanets have mostly relied on space-based observations of the hydrogen Lyman-α line in the far ultraviolet region, which is strongly affected by interstellar absorption. Using ground-based high-resolution spectroscopy, we detected excess absorption in the helium triplet at 1083 nanometers during the transit of the Saturn-mass exoplanet WASP-69b, at a signal-to-noise ratio of 18. We measured line blueshifts of several kilometers per second and posttransit absorption, which we interpret as the escape of part of the atmosphere trailing behind the planet in comet-like form.

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