A nearby m star with three transiting super-earths discovered by k2

Ian J.M. Crossfield, Erik Petigura, Joshua E. Schlieder, Andrew W. Howard, B. J. Fulton, Kimberly M. Aller, David R. Ciardi, Sébastien Lépine, Thomas Barclay, Imke De Pater, Katherine De Kleer, Elisa V. Quintana, Jessie L. Christiansen, Eddie Schlafly, Lisa Kaltenegger, Justin R. Crepp, Thomas Henning, Christian Obermeier, Niall Deacon, Lauren M. WeissHoward T. Isaacson, Brad M.S. Hansen, Michael C. Liu, Tom Greene, Steve B. Howell, Travis Barman, Christoph Mordasini

Research output: Contribution to journalArticlepeer-review

102 Scopus citations

Abstract

Small, cool planets represent the typical end-products of planetary formation. Studying the architectures of these systems, measuring planet masses and radii, and observing these planets' atmospheres during transit directly informs theories of planet assembly, migration, and evolution. Here we report the discovery of three small planets orbiting a bright (Ks = 8.6 mag) M0 dwarf using data collected as part of K2, the new ecliptic survey using the re-purposed Kepler spacecraft. Stellar spectroscopy and K2 photometry indicate that the system hosts three transiting planets with radii 1.5-2.1 , straddling the transition region between rocky and increasingly volatile-dominated compositions. With orbital periods of 10-45 days the planets receive just 1.5-10x the flux incident on Earth, making these some of the coolest small planets known orbiting a nearby star; planet d is located near the inner edge of the system's habitable zone. The bright, low-mass star makes this system an excellent laboratory to determine the planets' masses via Doppler spectroscopy and to constrain their atmospheric compositions via transit spectroscopy. This discovery demonstrates the ability of K2 and future space-based transit searches to find many fascinating objects of interest.

Original languageEnglish (US)
Article number10
JournalAstrophysical Journal
Volume804
Issue number1
DOIs
StatePublished - May 1 2015

Keywords

  • eclipses
  • stars: individual (EPIC 201367065)
  • tar.gz file
  • techniques: photometric
  • techniques: spectroscopic Supporting material: data behind figure

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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