K2-138 g: Spitzer Spots a Sixth Planet for the Citizen Science System

Kevin K. Hardegree-Ullman, Jessie L. Christiansen, David R. Ciardi, Ian J. M. Crossfield, Courtney D. Dressing, John H. Livingston, Kathryn Volk, Eric Agol, Thomas Barclay, Geert Barentsen, Björn Benneke, Varoujan Gorjian, Martti H. Kristiansen

Research output: Contribution to journalJournal articleResearchpeer-review


K2 greatly extended Kepler's ability to find new planets, but it was typically limited to identifying transiting planets with orbital periods below 40 days. While analyzing K2 data through the Exoplanet Explorers project, citizen scientists helped discover one super-Earth and four sub-Neptune sized planets in the relatively bright (V = 12.21, K = 10.3) K2-138 system, all which orbit near 3:2 mean-motion resonances.
Original languageEnglish
Article number219
JournalThe Astronomical Journal
Issue number5
Number of pages12
Publication statusPublished - 2021

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