Proxima Centauri b is not a transiting exoplanet

  title={Proxima Centauri b is not a transiting exoplanet},
  author={James S. Jenkins and Joseph Harrington and Ryan C. Challener and Nicol{\'a}s T. Kurtovic and R. Ramirez and Jos{\'e} Pe{\~n}a and Kathleen J. McIntyre and Michael D. Himes and E. Rodr'iguez and Guillem Anglada-Escud'e and Stefan Dreizler and Aviv Ofir and Pablo A Pe{\~n}a Rojas and Ignasi Ribas and Patricio M. Rojo and David M. Kipping and R. Paul Butler and Pedro J. Amado and Cristina Rodr'iguez-L'opez and Eliza M.-R. Kempton and Enric Pall{\'e} and Felipe Murgas},
  journal={Monthly Notices of the Royal Astronomical Society},
We report Spitzer Space Telescope observations during predicted transits of the exoplanet Proxima Centauri b. As the nearest terrestrial habitable-zone planet we will ever discover, any potential transit of Proxima b would place strong constraints on its radius, bulk density, and atmosphere. Subsequent transmission spectroscopy and secondary-eclipse measurements could then probe the atmospheric chemistry, physical processes, and orbit, including a search for biosignatures. However, our… 

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