An Improved Transit Measurement for a 2.4 R_{Earth} Planet Orbiting A Bright Mid-M Dwarf K2$-$28

Ge Chen, Heather A. Knutson, Courtney D. Dressing +13

We present a new {\em Spitzer} transit observation of K2$-$28b, a sub-Neptune ($R_{\mathrm{p}}=2.45\pm 0.28R_{Earth}$) orbiting a relatively bright ($V_{\mathrm{mag}}=16.06$, $K_{\rm mag…