TOI-858 B b: A hot Jupiter on a polar orbit in a loose binary
| Autor: | 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. |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | A&A 679, A70 (2023) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1051/0004-6361/202244940 |
| Popis: | 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 |
| Databáze: | arXiv |
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