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We report the measurement of a spectroscopic transit of TOI-1726 c, one oftwo planets transiting a G-type star with $V$ = 6.9 in the Ursa Major MovingGroup ($\sim$400 Myr). With a precise age constraint from cluster membership,TOI-1726 provides a great opportunity to test various obliquity excitationscenarios that operate on different timescales. By modeling theRossiter-McLaughlin (RM) effect, we derived a sky-projected obliquity of$-1^{+35}_{-32}~^{\circ}$. This result rules out a polar/retrograde orbit; andis consistent with an aligned orbit for planet c. Considering the previouslyreported, similarly prograde RM measurement of planet b and the transitingnature of both planets, TOI-1726 tentatively conforms to the overall picturethat compact multi-transiting planetary systems tend to have coplanar, likelyaligned orbits. TOI-1726 is also a great atmospheric target for understandingdifferential atmospheric loss of sub-Neptune planets (planet b 2.2 $R_\oplus$and c 2.7 $R_\oplus$ both likely underwent photoevaporation). The coplanargeometry points to a dynamically cold history of the system that simplifies anyfuture modeling of atmospheric escape.

TKS III: A Stellar Obliquity Measurement of TOI-1726 c