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

Ikwut-Ukwa, Mma and Rodriguez, Joseph E. and Bieryla, Allyson and Vanderburg, Andrew and Mocnik, Teo and Kane, Stephen R. and Quinn, Samuel N. and Colon, Knicole D. and Zhou, George ORCID: and Eastman, Jason D. and Huang, Chelsea X. ORCID: and Latham, David W. and Dotson, Jessie and Jenkins, Jon M. and Ricker, George R. and Seager, Sara and Vanderspek, Roland K. and Winn, Joshua N. and Barclay, Thomas and Barentsen, Geert and Berta-Thompson, Zachory and Charbonneau, David and Dragomir, Diana and Daylan, Tansu and Gunther, Maximilian N. and Hedges, Christina and Henze, Christopher E. and McDermott, Scott and Schlieder, Joshua E. and Quintana, Elisa V. and Smith, Jeffrey C. and Twicken, Joseph D. and Yahalomi, Daniel A. (2020) The K2 and TESS Synergy. I. Updated Ephemerides and Parameters for K2-114, K2-167, K2-237, and K2-261. The Astronomical Journal, 160 (5):209. pp. 1-13. ISSN 0004-6256

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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.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 14 Feb 2022 01:14
Last Modified: 14 Feb 2022 02:22
Uncontrolled Keywords: Exoplanets; Transit photometry; Transits; Radial velocity; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Solar and Stellar Astrophysics
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
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