# TESS Program G04140

Title: Characterizing The Resonant Exoplanet System K2-138

PI: Christiansen, Jessie - NASA/Exoplanet Science Institute

Type: MINI

Summary: We propose to observe the benchmark K2-138 system with 2-minute cadence observations to measure transit timing variations. K2-138 is one of a small but extremely valuable set of systems for which the planet masses can be measured with both transit timing variations (TTVs) and precise radial velocity (PRV) measurements; fewer than 10 such systems are currently known. Having simultaneous and complementary TTV and PRV observations leads to tighter constraints on the masses, compositions, and eccentricities [1]. K2-138 represents a promising new laboratory for studying multi-planet dynamics.


# Sector 042 targets observed (2 min: 1, 20 s: 1)
4610830,348.949,-10.8498,11.5,G04140;G04205;G04242;20SECONDTARGET