Imaging & Spectroscopy

The K2 & TESS Synergy II: Revisiting 26 systems in the TESS Primary Mission

By Keith Cowing
Press Release
January 5, 2023
Filed under , , , ,
The K2 & TESS Synergy II: Revisiting 26 systems in the TESS Primary Mission
Overlap between K2 campaigns and TESS sectors. The number of times each K2 target was observed in TESS sectors is indicated by the color, with gray indicating no TESS overlap as of Sector 46. The systems analyzed in this study are labeled. — astro-ph.EP

The legacy of NASA’s K2 mission has provided hundreds of transiting exoplanets that can be revisited by new and future facilities for further characterization, with a particular focus on studying the atmospheres of these systems.

However, the majority of K2-discovered exoplanets have typical uncertainties on future times of transit within the next decade of greater than four hours, making observations less practical for many upcoming facilities. Fortunately, NASA’s Transiting exoplanet Survey Satellite (TESS) mission is reobserving most of the sky, providing the opportunity to update the ephemerides for ∼300 K2 systems. In the second paper of this series, we reanalyze 26 single-planet, K2-discovered systems that were observed in the TESS primary mission by globally fitting their K2 and TESS lightcurves (including extended mission data where available), along with any archival radial velocity measurements.

As a result of the faintness of the K2 sample, 13 systems studied here do not have transits detectable by TESS. In those cases, we re-fit the K2 lightcurve and provide updated system parameters. For the 23 systems with M∗≳0.6M⊙, we determine the host star parameters using a combination of Gaia parallaxes, Spectral Energy Distribution (SED) fits, and MESA Isochrones and Stellar Tracks (MIST) stellar evolution models. Given the expectation of future TESS extended missions, efforts like the K2 & TESS Synergy project will ensure the accessibility of transiting planets for future characterization while leading to a self-consistent catalog of stellar and planetary parameters for future population efforts.

Erica Thygesen, Jessica A. Ranshaw, Joseph E. Rodriguez, Andrew Vanderburg, Samuel N. Quinn, Jason D. Eastman, Allyson Bieryla, David W. Latham, Roland K. Vanderspek, Jon M. Jenkins, Douglas A. Caldwell, Mma Ikwut-Ukwa, Knicole D. Colón, Jessie Dotson, Christina Hedges, Karen A. Collins, Michael L. Calkins, Perry Berlind, Gilbert A. Esquerdo

Comments: Accepted for publication in ApJ. 29 pages, 9 figures, 12 tables
Subjects: Earth and Planetary Astrophysics (astro-ph.EP)
Cite as: arXiv:2301.01306 [astro-ph.EP] (or arXiv:2301.01306v1 [astro-ph.EP] for this version)
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Submission history
From: Erica Thygesen
[v1] Tue, 3 Jan 2023 19:00:02 UTC (12,228 KB)

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