TOI-1670 c, a 40 day Orbital Period Warm Jupiter in a Compact System, Is Well Aligned
Mahadevan, Suvrath; Rice, Malena; Wright, Jason T.; Logsdon, Sarah E.; Wang, Songhu; Kanodia, Shubham; Ninan, Joe P.; Bender, Chad F.; Halverson, Samuel; Robertson, Paul; Roy, Arpita; Schwab, Christian; Li, Dan; Lin, Andrea S. J.; Beard, Corey; Lubin, Jack; Wang, Xian-Yu; Alvarado-Montes, Jaime A.; Dong, Jiayin; Rajagopal, Jayadev; Gupta, Arvind F.; Stefansson, Gudmundur; Lubar, Emily; Radzom, Brandon T.
United States, Australia, Switzerland, India
Abstract
We report the measurement of the sky-projected obliquity angle λ of the warm Jovian exoplanet TOI-1670 c via the Rossiter-McLaughlin effect. We observed the transit window during UT 2023 April 20 for 7 continuous hours with NEID on the 3.5 m WIYN Telescope at Kitt Peak National Observatory. TOI-1670 hosts a sub-Neptune (P ~ 11 days; planet b) interior to the warm Jovian (P ~ 40 days; planet c), which presents an opportunity to investigate the dynamics of a warm Jupiter with an inner companion. Additionally, TOI-1670 c is now among the longest-period planets to date to have its sky-projected obliquity angle measured. We find planet c is well aligned to the host star, with λ = - 0.°3 ± 2.°2. TOI-1670 c joins a growing census of aligned warm Jupiters around single stars and aligned planets in multiplanet systems.