학술논문
TOI-858 B b: A hot Jupiter on a polar orbit in a loose binary
Document Type
Working Paper
Author
Hagelberg, J.; Nielsen, L. D.; Attia, O.; Bourrier, V.; Pearce, L.; Venturini, J.; Winn, J. N.; Bouchy, F.; Bouma, L. G.; Briceño, C.; Collins, K. A.; Davis, A. B.; Eastman, J. D.; Evans, P.; Grieves, N.; Guerrero, N. M.; Hellier, C.; Jones, M. I.; Latham, D. W.; Law, N.; Mann, A. W.; Marmier, M.; Ottoni, G.; Radford, D. J.; Restori, N.; Rudat, A.; Santos, L. Dos; Seager, S.; Stassun, K.; Stockdale, C.; Udry, S.; Wang, Songhu; Ziegler, C.
Source
A&A 679, A70 (2023)
Subject
Language
Abstract
We report the discovery of a hot Jupiter on a 3.28-day orbit around a 1.08 M$_{Sun}$ G0 star that is the secondary component in a loose binary system. Based on follow-up radial velocity observations of TOI-858 B with CORALIE on the Swiss 1.2 m telescope and CHIRON on the 1.5 m telescope at the Cerro Tololo Inter-American Observatory (CTIO), we measured the planet mass to be $1.10\pm 0.08$ M$_{J}$ . Two transits were further observed with CORALIE to determine the alignment of TOI-858 B b with respect to its host star. Analysis of the Rossiter-McLaughlin signal from the planet shows that the sky-projected obliquity is $\lambda = 99.3\pm 3.8$. Numerical simulations show that the neighbour star TOI-858 A is too distant to have trapped the planet in a Kozai-Lidov resonance, suggesting a different dynamical evolution or a primordial origin to explain this misalignment. The 1.15 Msun primary F9 star of the system (TYC 8501-01597-1, at $\rho$ ~11") was also observed with CORALIE in order to provide upper limits for the presence of a planetary companion orbiting that star.
Comment: Accepted for publication in A&A
Comment: Accepted for publication in A&A