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

Jack Lubin, Xian Yu Wang, Malena Rice, Jiayin Dong, Songhu Wang, Brandon T. Radzom, Paul Robertson, Gudmundur Stefansson, Jaime A. Alvarado-Montes, Corey Beard, Chad F. Bender, Arvind F. Gupta, Samuel Halverson, Shubham Kanodia, Dan Li, Andrea S.J. Lin, Sarah E. Logsdon, Emily Lubar, Suvrath Mahadevan, Joe P. NinanJayadev Rajagopal, Arpita Roy, Christian Schwab, Jason T. Wright

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


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.

Original languageEnglish (US)
Article numberL5
JournalAstrophysical Journal Letters
Issue number1
StatePublished - Dec 1 2023

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this