Journal
ASTRONOMICAL JOURNAL
Volume 157, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/1538-3881/aafa70
Keywords
binaries: close; planets and satellites: detection; planets and satellites: individual (EPIC210693462Bb, K2-288Bb); techniques: photometric; techniques: spectroscopic
Categories
Funding
- National Aeronautics and Space Administration under the Exoplanet Exploration Program
- North Carolina Space Grant Consortium
- NASA's Minority University Research and Education Program Institutional Research Opportunity
- NSF graduate research fellowship program
- NSF Graduate Research Fellowship [DGE 1339067]
- National Science Foundation Graduate Research Fellowship [DGE1322106]
- NASAs Minority University Research and Education Program
- Gaia Multilateral Agreement
- NASA Science Mission directorate
- NASA [NAS5-26555]
- NASA Office of Space Science [NNX09AF08G]
- W. M. Keck Foundation
- AHRC [AH/L007010/1] Funding Source: UKRI
- STFC [ST/N003179/1, ST/S000488/1] Funding Source: UKRI
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Observations from the Kepler and K2 missions have provided the astronomical community with unprecedented amounts of data to search for transiting exoplanets and other astrophysical phenomena. Here, we present K2-288, a low-mass binary system (M2.0 +/- 1.0; M3.0 +/- 1.0) hosting a small (R-p = 1.9 R-circle plus), temperate (T-eq = 226 K) planet observed in K2 Campaign 4. The candidate was first identified by citizen scientists using Exoplanet Explorers hosted on the Zooniverse platform. Follow-up observations and detailed analyses validate the planet and indicate that it likely orbits the secondary star on a 31.39-day period. This orbit places K2-288Bb in or near the habitable zone of its low-mass host star. K2-288Bb resides in a system with a unique architecture, as it orbits at >0.1 au from one component in a moderate separation binary (a(proj) similar to 55 au), and further follow-up may provide insight into its formation and evolution. Additionally, its estimated size straddles the observed gap in the planet radius distribution. Planets of this size occur less frequently and may be in a transient phase of radius evolution. K2-288 is the third transiting planet system identified by the Exoplanet Explorers program and its discovery exemplifies the value of citizen science in the era of Kepler, K2, and the Transiting Exoplanet Survey Satellite.
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