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

Abstract

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.

arXiv comment14 pages, 6 figures, 5 tables, published in AJ

References in corpus (49)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• Gaia Data Release 2. Summary of the contents and survey properties
• Measuring Reddening with SDSS Stellar Spectra and Recalibrating SFD
• Modules for Experiments in Stellar Astrophysics (MESA)
• The Transiting Exoplanet Survey Satellite
• Modules for Experiments in Stellar Astrophysics (MESA): Giant Planets, Oscillations, Rotation, and Massive Stars
• Modules for Experiments in Stellar Astrophysics (MESA): Binaries, Pulsations, and Explosions
• MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
• The James Webb Space Telescope
• MESA Isochrones and Stellar Tracks (MIST) 0: Methods for the construction of stellar isochrones
• The K2 Mission: Characterization and Early results
• Kepler Presearch Data Conditioning II - A Bayesian Approach to Systematic Error Correction
• Kepler Presearch Data Conditioning I - Architecture and Algorithms for Error Correction in Kepler Light Curves
• EXOFAST: A fast exoplanetary fitting suite in IDL
• AstroImageJ: Image Processing and Photometric Extraction for Ultra-Precise Astronomical Light Curves
• AstroImageJ: Image Processing and Photometric Extraction for Ultra-Precise Astronomical Light Curves (Expanded Edition)
• A Technique for Extracting Highly Precise Photometry for the Two-Wheeled Kepler Mission
• Planetary Candidates Observed by Kepler. VIII. A Fully Automated Catalog With Measured Completeness and Reliability Based on Data Release 25
• HAT-P-11b: A Super-Neptune Planet Transiting a Bright K Star in the Kepler Field
• The Kilodegree Extremely Little Telescope (KELT): A Small Robotic Telescope for Large-Area Synoptic Surveys
• The first WASP public data release
• Evidence for a systematic offset of -80 micro-arcseconds in the Gaia DR2 parallaxes
• Initial Characteristics of Kepler Long Cadence Data For Detecting Transiting Planets
• Kepler Data Validation I -- Architecture, Diagnostic Tests, and Data Products for Vetting Transiting Planet Candidates
• The Next Generation Transit Survey (NGTS)
• Kepler Data Validation II -- Transit Model Fitting and Multiple-Planet Search
• Planetary Candidates from the First Year of the K2 Mission
• TESS Discovery of a Transiting Super-Earth in the $\pi$ Mensae System
• 275 Candidates and 149 Validated Planets Orbiting Bright Stars in K2 Campaigns 0-10
• The KELT-South Telescope
• TESS Discovery of an ultra-short-period planet around the nearby M dwarf LHS 3844
• The Kepler Pixel Response Function
• TRAPPIST: a robotic telescope dedicated to the study of planetary systems
• Spitzer Observations Confirm and Rescue the Habitable-Zone Super-Earth K2-18b for Future Characterization
• Characterizing K2 Planet Discoveries: A super-Earth transiting the bright K-dwarf HIP 116454
• Variability Properties of 4 Million Sources in the $TESS$ Input Catalog Observed with the Kilodegree Extremely Little Telescope Survey
• 60 Validated Planets from K2 Campaigns 5-8
• Five Planets Transiting a Ninth Magnitude Star
• An Eccentric Massive Jupiter Orbiting a Sub-Giant on a 9.5 Day Period Discovered in the Transiting Exoplanet Survey Satellite Full Frame Images
• Interferometric diameters of five evolved intermediate-mass planet-hosting stars measured with PAVO at the CHARA Array
• K2-260 b: a hot Jupiter transiting an F star, and K2-261 b: a warm Saturn around a bright G star
• Original Research By Young Twinkle Students (ORBYTS): Ephemeris Refinement of Transiting Exoplanets
• Securing the legacy of TESS through the care and maintenance of TESS planet ephemerides
• K2-114b and K2-115b: Two Transiting Warm Jupiters
• A Search for Additional Bodies in the GJ 1132 Planetary System from 21 Ground-based Transits and a 100 Hour Spitzer Campaign
• Spitzer transit follow-up of planet candidates from the K2 mission
• EPIC229426032 b and EPIC246067459 b: discovery and characterization of two new transiting hot Jupiters from K2
• K2-295 b and K2-237 b: two transiting hot Jupiters

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• Empirical limb-darkening coefficients & transit parameters of known exoplanets from TESS
• Visible-light Phase Curves from the Second Year of the TESS Primary Mission
• Obliquities of Exoplanet Host Stars: 19 New and Updated Measurements, and Trends in the Sample of 205 Measurements
• Science Extraction from TESS Observations of Known Exoplanet Hosts
• A low-eccentricity migration pathway for a 13-h-period Earth analogue in a four-planet system
• Another Shipment of Six Short-Period Giant Planets from TESS
• Giant Outer Transiting Exoplanet Mass (GOT 'EM) Survey. II. Discovery of a Failed Hot Jupiter on a 2.7 Year, Highly Eccentric Orbit
• TESS Giants Transiting Giants III: An eccentric warm Jupiter supports a period-eccentricity relation for giant planets transiting evolved stars
• Revisiting the Transit Timing Variations in the TrES-3 and Qatar-1 systems with TESS data
• The K2 & TESS Synergy II: Revisiting 26 systems in the TESS Primary Mission
• NGTS-13b: A hot 4.8 Jupiter-mass planet transiting a subgiant star
• Following up TESS Single Transits With Archival Photometry and Radial Velocities
• K2, Spitzer, and TESS Transits of Four Sub-Neptune Exoplanets