Journal article · Preprint article
The K2-138 System: A Near-resonant Chain of Five Sub-Neptune Planets Discovered by Citizen Scientists
K2-138 is a moderately bright (V = 12.2, K = 10.3) main-sequence K star observed in Campaign 12 of the NASA K2 mission. It hosts five small (1.6-3.3 R⊕) transiting planets in a compact architecture. The periods of the five planets are 2.35, 3.56, 5.40, 8.26, and 12.76 days, forming an unbroken chain of near 3:2 resonances.
Although we do not detect the predicted 2-5 minute transit timing variations (TTVs) with the K2 timing precision, they may be observable by higher-cadence observations with, for example, Spitzer or CHEOPS. The planets are amenable to mass measurement by precision radial velocity measurements, and therefore K2-138 could represent a new benchmark system for comparing radial velocity and TTV masses.
K2-138 is the first exoplanet discovery by citizen scientists participating in the Exoplanet Explorers project on the Zooniverse platform.
| Language: | English |
|---|---|
| Publisher: | American Astronomical Society |
| Year: | 2018 |
| Pages: | 57 |
| ISSN: | 15384357 , 0004637x , 15383881 and 00046256 |
| Types: | Journal article and Preprint article |
| DOI: | 10.3847/1538-3881/aa9be0 |
| ORCIDs: | 0000-0002-8035-4778 , 0000-0001-5578-359X , 0000-0001-7139-2724 , 0000-0001-5882-3323 , 0000-0003-0967-2893 , 0000-0001-5347-7062 , 0000-0001-8189-0233 , 0000-0001-7246-5438 , 0000-0001-8638-0320 and 0000-0002-5658-0601 |
