The K2 and TESS Synergy III: search and rescue of the lost ephemeris for K2's first planet

Erica Thygesen, Joseph E. Rodriguez, Zoë L. De Beurs +13

K2-2 b/HIP 116454 b, the first exoplanet discovery by K2 during its Two-Wheeled Concept Engineering Test, is a sub-Neptune (2.5 $\pm$ 0.1 $R_{\oplus }$, 9.7 $\pm$ 1.2 $M_{\oplus }$) orbi…