Program: GN-2021B-Q-218

We propose to use Maroon-X to observe the two Neptune-sized planets in the young (20-160MYr) TOI-942 system in transit to constrain their obliquities via the Rossiter-McLaughlin (RM) effect, a powerful probe of the dynamical history of the system. Currently, only 3 planetary systems have published RM observations for multple planets in the same system. In two cases, the planets have coplanar orbits and the plane of the orbits is well-aligned with the stellar equator, while in the third case, the planetary orbits ar aligned but together they are severly misaligned relative to the star. TOI-942 would significantly add to this sample, as it would be the youngest such system by a factor of 4-10, giving key insights into dynamical interaction timescales which are otherwise left unconstrained. Further, the two planets orbiting TOI-942 show evidence of having eccentric orbits, hinting at previous dynamical interactions that could excite misaligned orbits. Leveraging Maroon-X's high throughput and high RV precision, we expect to achieve exquisite sky-projected obliquity constraints of 6degrees and 3 degrees for the two planets in a single transit of both planets, allowing us to gain key insights into the formation history of this benchmark system for planetary architectures.