A nearby M star with three transiting super-Earths discovered by K2

TL;DR

This paper reports the discovery of three small transiting planets around a nearby bright M0 dwarf star using K2 data, providing valuable targets for studying planetary composition, atmospheres, and habitability.

Contribution

First discovery of a multi-planet system of small, potentially rocky planets around a bright, nearby M dwarf using K2 data, highlighting the potential for future detailed characterization.

Findings

Three transiting planets with radii 1.5-2.1 R_Earth

Planets receive 1.5-10 times Earth's incident flux

Planet d is near the habitable zone's inner edge

Abstract

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.