期刊
ASTRONOMICAL JOURNAL
卷 155, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/1538-3881/aa9be0
关键词
eclipses; stars: individual (K2-138); techniques: photometric; techniques: spectroscopic
资金
- NASA Science Mission directorate
- Alfred P. Sloan Foundation
- National Aeronautics and Space Administration (NASA) through Einstein Postdoctoral Fellowship [PF5-160143]
- NASA [NAS8-03060]
- National Science Foundation
- U.S. Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
- STFC [ST/N003179/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/N003179/1] Funding Source: researchfish
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-circle plus) 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.
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