TY - JOUR
T1 - The K2-138 System: A Near-resonant Chain of Five Sub-Neptune Planets Discovered by Citizen Scientists
AU - Christiansen, Jessie L.
AU - Crossfield, Ian J. M.
AU - Barentsen, Geert
AU - Lintott, Chris J.
AU - Barclay, Thomas
AU - Simmons, Brooke D.
AU - Petigura, Erik
AU - Schlieder, Joshua E.
AU - Dressing, Courtney D.
AU - Vanderburg, Andrew
AU - Allen, Campbell
AU - McMaster, Adam
AU - Miller, Grant
AU - Veldthuis, Martin
AU - Wolfenbarger, Zach
AU - Cox, Brian
AU - Zemiro, Julia
AU - Howard, Andrew W.
AU - Livingston, John
AU - Sinukoff, Evan
AU - Catron, Timothy
AU - Grey, Andrew
AU - Kusch, Joshua J. E.
AU - Terentev, Ivan
AU - Vales, Martin
AU - Kristiansen, Martti H.
N1 - © 2018. The American Astronomical Society. All rights reserved.
PY - 2018
Y1 - 2018
N2 - 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.
AB - 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.
KW - Eclipses
KW - Stars: individual (K2-138)
KW - Techniques: photometric
KW - Techniques: spectroscopic
U2 - 10.3847/1538-3881/aa9be0
DO - 10.3847/1538-3881/aa9be0
M3 - Journal article
SN - 0004-637X
VL - 155
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
ER -