# TESS Program G09126

Title: TESS Cycle 9 Monitoring Of Young And Resonant Planetary Systems

PI: Dai, Fei - University Of Hawaii (Manoa)

Type: SMALL

Summary: We propose a Cycle 9 program to monitor ~85 planetary systems that can directly test the Break-the-Chains model of close-in planet formation. Our sample includes ~8 confirmed systems younger than 100 Myr, ~17 systems younger than 1 Gyr, and ~60 additional TTV systems that are likely young. Recent work suggests that young planetary systems are preferentially found near mean-motion resonances, but this picture is still based on only a small number of confirmed young systems. Cycle 9's longer coverage improves sensitivity to missed outer companions and extends the timing baseline for Kepler/K2 systems by up to a decade. We will search for additional transiting planets, identify resonant chains, constrain masses, orbital architectures, and ephemerides especially for the JWST targets


# Sector 108 targets observed (2 min: 6, 20 s: 6)
179034327,64.1839,-26.7668,9.06,G09031;G09123;G09126;20SECONDTARGET
178155732,42.9854,-30.8137,5.91,G09062;G09123;G09126;20SECONDTARGET
146520535,76.6497,-20.2456,11.05,G09031;G09123;G09126;20SECONDTARGET
1167538,70.9976,-31.9067,10.01,G09123;G09126;20SECONDTARGET
93125144,84.8466,-19.5585,9.68,G09123;G09126;20SECONDTARGET
320411045,110.1704,-33.9223,12.32,G09058;G09126;20SECONDTARGET

# Sector 109 targets observed (2 min: 7, 20 s: 6)
146520535,76.6497,-20.2456,11.05,G09031;G09123;G09126;20SECONDTARGET
31374837,83.2693,-26.7234,8.17,G09031;G09123;G09126;G09126;20SECONDTARGET
77951245,79.0052,-31.4127,12.43,G09123;G09126
93125144,84.8466,-19.5585,9.68,G09123;G09126;20SECONDTARGET
179034327,64.1839,-26.7668,9.06,G09031;G09123;G09126;20SECONDTARGET
320411045,110.1704,-33.9223,12.32,G09058;G09126;20SECONDTARGET
118339710,129.572,-23.5502,10.35,G09034;G09126;20SECONDTARGET