K2-136: A Binary System in the Hyades Cluster Hosting a Neptune-sized Planet

  • Ciardi D
  • Crossfield I
  • Feinstein A
  • et al.
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Abstract

We report the discovery of a Neptune-size planet (R_p = 3.0 R_Earth) in the Hyades Cluster. The host star is in a binary system, comprising a K5V star and M7/8V star with a projected separation of 40 AU. The planet orbits the primary star with an orbital period of 17.3 days and a transit duration of 3 hours. The host star is bright (V=11.2, J=9.1) and so may be a good target for precise radial velocity measurements. K2-nnnA~b is the first Neptune-sized planet to be found orbiting in a binary system within an open cluster. The Hyades is the nearest star cluster to the Sun, has an age of 625-750 Myr, and forms one of the fundamental rungs in the distance ladder; understanding the planet population in such a well-studied cluster can help us understand and set constraints on the formation and evolution of planetary systems.

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APA

Ciardi, D. R., Crossfield, I. J. M., Feinstein, A. D., Schlieder, J. E., Petigura, E. A., David, T. J., … Thackeray, B. (2017). K2-136: A Binary System in the Hyades Cluster Hosting a Neptune-sized Planet. The Astronomical Journal, 155(1), 10. https://doi.org/10.3847/1538-3881/aa9921

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