A low-mass planet candidate orbiting Proxima Centauri at a distance of 1.5 AU

  title={A low-mass planet candidate orbiting Proxima Centauri at a distance of 1.5 AU},
  author={Mario Damasso and Fabio Del Sordo and Guillem Anglada-Escud{\'e} and Paolo Giacobbe and Alessandro Sozzetti and Alessandro Morbidelli and Grzegorz Pojmański and Domenico Barbato and R. Paul Butler and Hugh R. A. Jones and Franz-josef Hambsch and James S. Jenkins and Mar{\'i}a Jos{\'e} L{\'o}pez-Gonz{\'a}lez and Nicol{\'a}s Morales and Pablo A. Pe{\~n}a Rojas and Cristina Rodr{\'i}guez-L{\'o}pez and Eloy Rodr{\'i}guez and Pedro J. Amado and Guillem Anglada and Fabo Feng and Jos{\'e} F. G{\'o}mez},
  journal={Science Advances},
Proxima could host a planet on a ∼5-year orbit, which Gaia can confirm in the near future providing its exact mass. Our nearest neighbor, Proxima Centauri, hosts a temperate terrestrial planet. We detected in radial velocities evidence of a possible second planet with minimum mass mc sin ic = 5.8 ± 1.9M⊕ and orbital period Pc=5.21−0.22+0.26 years. The analysis of photometric data and spectro-scopic activity diagnostics does not explain the signal in terms of a stellar activity cycle, but follow… 
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