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. Ninan; Jayadev Rajagopal; Aripta Roy; Christian Schwab; Jason T. Wright

arXiv · 2311.16237

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

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Abstract

We report the measurement of the sky-projected obliquity angle $\lambda$ of the Warm Jovian exoplanet TOI-1670 c via the Rossiter-McLaughlin effect as part of the Stellar Obliquities in Long-period Exoplanet Systems (SOLES) project. We observed the transit window during UT 20 April 2023 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 $\lambda$ = -0.3 +/- 2.2 degrees. TOI-1670 c joins a growing census of aligned Warm Jupiters around single stars and aligned planets in multi-planet systems.

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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. Ninan, Jayadev Rajagopal, Aripta Roy, Christian Schwab, Jason T. Wright. 2023-11-27. TOI-1670 c, a 40-day Orbital Period Warm Jupiter in a Compact System, is Well-aligned. https://arxiv.org/abs/2311.16237

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