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Journal Article

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

MPS-Authors

Nortmann,  Lisa
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pallé,  Enric
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Salz,  Michael
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sanz-Forcada,  Jorge
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Nagel,  Evangelos
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Alonso-Floriano,  F. Javier
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Czesla,  Stefan
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Yan,  Fei
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Chen,  Guo
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Snellen,  Ignas A. G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zechmeister,  Mathias
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Schmitt,  Jürgen H. M. M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

López-Puertas,  Manuel
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Casasayas-Barris,  Núria
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Bauer,  Florian F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Amado,  Pedro J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Caballero,  José A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Dreizler,  Stefan
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Henning,  Thomas
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lampón,  Manuel
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Montes,  David
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Molaverdikhani,  Karan
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Quirrenbach,  Andreas
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Reiners,  Ansgar
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ribas,  Ignasi
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sánchez-López,  Alejandro
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Schneider,  P. Christian
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Zapatero Osorio,  María R.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2018Sci...362.1388N
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Citation

Nortmann, L., Pallé, E., Salz, M., Sanz-Forcada, J., Nagel, E., Alonso-Floriano, F. J., et al. (2018). Ground-based detection of an extended helium atmosphere in the Saturn-mass exoplanet WASP-69b. Science, 362, 1388-1391.


Cite as: https://hdl.handle.net/21.11116/0000-0005-CBEA-F
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.