Detection of an Atmosphere on a Rocky Exoplanet

  title={Detection of an Atmosphere on a Rocky Exoplanet},
  author={Mark R. Swain and Raissa Estrela and Gael M. Roudier and Christophe Sotin and Paul B. Rimmer and Adriana Valio and Robert West and Kyle Pearson and Noah Huber-Feely and Robert T. Zellem},
  journal={The Astronomical Journal},
We report the detection of an atmosphere on a rocky exoplanet, GJ 1132 b, which is similar to Earth in terms of size and density. The atmospheric transmission spectrum was detected using Hubble WFC3 measurements and shows spectral signatures of aerosol scattering, HCN, and CH4 in a low mean molecular weight atmosphere. We model the atmospheric loss process and conclude that GJ 1132 b likely lost the original H/He envelope, suggesting that the atmosphere that we detect has been reestablished. We… 
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The Featureless HST/WFC3 Transmission Spectrum of the Rocky Exoplanet GJ 1132b: No Evidence for a Cloud-free Primordial Atmosphere and Constraints on Starspot Contamination
Orbiting an M dwarf 12 pc away, the transiting exoplanet GJ 1132b is a prime target for transmission spectroscopy. With a mass of 1.7 M ⊕ and radius of 1.1 R ⊕, GJ 1132b’s bulk density indicates that
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    Proceedings of the National Academy of Sciences
  • 2020
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