Small, cool planets represent the typical end-products of planetary formation. Studying the archi- tectures 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 transit 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 R_Earth, 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.
@article{arxiv.1501.03798,
title = {A nearby M star with three transiting super-Earths discovered by K2},
author = {Ian J. M. Crossfield and Erik Petigura and Joshua Schlieder and Andrew W. Howard and B. J. Fulton and Kimberly M. Aller and David R. Ciardi and Sebastien Lepine and Thomas Barclay and Imke de Pater and Katherine de Kleer and Elisa V. Quintana and Jessie L. Christiansen and Eddie Schlafly and Lisa Kaltenegger and Justin R. Crepp and Thomas Henning and Christian Obermeier and Niall Deacon and Lauren M. Weiss and Howard T. Isaacson and Brad M. S. Hansen and Michael C. Liu and Tom Greene and Steve B. Howell and Travis Barman and Christoph Mordasini},
journal= {arXiv preprint arXiv:1501.03798},
year = {2015}
}
Comments
ApJ accepted. Spectra and light curves available at ApJ or via arXiv source