TOI-1670 c, a 40 day Orbital Period Warm Jupiter in a Compact System, Is Well Aligned

Lubin, Jack; Wang, Xian-Yu; Rice, Malena; Dong, Jiayin; Wang, Songhu; Radzom, Brandon T.; Robertson, Paul; Stefansson, Gudmundur; Alvarado-Montes, Jaime A.; Beard, Corey; Bender, Chad F.; Gupta, Arvind F.; Halverson, Samuel; Kanodia, Shubham; Li, Dan; Lin, Andrea S. J.; Logsdon, Sarah E.; Lubar, Emily; Mahadevan, Suvrath; Ninan, Joe P.; Rajagopal, Jayadev; Roy, Arpita; Schwab, Christian; Wright, Jason T.
2023
ASTROPHYSICAL JOURNAL LETTERS
DOI
10.3847/2041-8213/ad0fea
We report the measurement of the sky-projected obliquity angle lambda 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 similar to 11 days; planet b) interior to the warm Jovian (P similar to 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 lambda = - 0.degrees 3 +/- 2.degrees 2. TOI-1670 c joins a growing census of aligned warm Jupiters around single stars and aligned planets in multiplanet systems.