The K2 and TESS Synergy. I. Updated Ephemerides and Parameters for K2-114, K2-167, K2-237, and K2-261

Mma Ikwut-Ukwa, Joseph E. Rodriguez, Allyson Bieryla, Andrew Vanderburg, Teo Mocnik, Stephen R. Kane, Samuel N. Quinn, Knicole D. Colón, George Zhou, Jason D. Eastman, Chelsea X. Huang, David W. Latham, Jessie Dotson, Jon M. Jenkins, George R. Ricker, Sara Seager, Roland K. Vanderspek, Joshua N. Winn, Thomas Barclay, Geert BarentsenZachory Berta-Thompson, David Charbonneau, Diana Dragomir, Tansu Daylan, Maximilian N. Günther, Christina Hedges, Christopher E. Henze, Scott McDermott, Joshua E. Schlieder, Elisa V. Quintana, Jeffrey C. Smith, Joseph D. Twicken, Daniel A. Yahalomi

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


Although the Transiting Exoplanet Survey Satellite (TESS) primary mission observed the northern and southern ecliptic hemispheres, generally avoiding the ecliptic, and the Kepler space telescope during the K2 mission could only observe near the ecliptic, many of the K2 fields extend far enough from the ecliptic plane that sections overlap with TESS fields. Using photometric observations from both K2 and TESS, combined with archival spectroscopic observations, we globally modeled four known planetary systems discovered by K2 that were observed in the first year of the primary TESS mission. Specifically, we provide updated ephemerides and system parameters for K2-114 b, K2-167 b, K2-237 b, and K2-261 b. These were some of the first K2 planets to be observed by TESS in the first year and include three Jovian sized planets and a sub-Neptune with orbital periods less than 12 days. In each case, the updated ephemeris significantly reduces the uncertainty in prediction of future times of transit, which is valuable for planning observations with the James Webb Space Telescope and other future facilities. The TESS extended mission is expected to observe about half of the K2 fields, providing the opportunity to perform this type of analysis on a larger number of systems.

Original languageEnglish (US)
Article number209
JournalAstronomical Journal
Issue number5
StatePublished - Nov 2020

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


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