2023A&A...679A..70H

Query : 2023A&A...679A..70H

2023A&A...679A..70H - Astronomy and Astrophysics, volume 679A70 (2023/11-1)

TOI-858 B b: A hot Jupiter on a polar orbit in a loose binary.

HAGELBERG J., NIELSEN L.D., ATTIA O., BOURRIER V., PEARCE L., VENTURINI J., WINN J.N., BOUCHY F., BOUMA L.G., BRICENO C., COLLINS K.A., DAVIS A.B., EASTMAN J.D., EVANS P., FALK B., 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., DOS SANTOS L., SEAGER S., STASSUN K., STOCKDALE C., UDRY S., WANG S. and ZIEGLER C.

Abstract (from CDS):

We report the discovery of a hot Jupiter on a 3.28-day orbit around a 1.08 M_⊙ 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_–0.07^+0.08M_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 λ = 99.3_–3.7^+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 M_⊙ primary F9 star of the system (TYC 8501-01597-1, at ρ ∼11″) was also observed with CORALIE in order to provide upper limits for the presence of aplanetary companion orbiting that star.

Abstract Copyright: © The Authors 2023

Journal keyword(s): planets and satellites: detection - planets and satellites: individual: TOI-858B - planets and satellites: individual: TOI-858A - planets and satellites: dynamical evolution and stability - binaries: visual

VizieR on-line data: <Available at CDS (J/A+A/679/A70): tablea1.dat tablea2.dat tablea3.dat>

Simbad objects: 4

Full paper

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Number of rows : 4

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	* tau Cet	PM*	01 44 04.0831371922	-15 56 14.927607677	4.43	4.22	3.50	2.88	2.41	G8V	1354	1
2	TOI-858	*	04 00 47.9384933679	-54 35 34.333133898				11.155		~	11	0
3	TOI-858.01	Pl?	04 00 47.9385426407	-54 35 34.333427007						~	3	0
4	TYC 8501-1597-1	*	04 00 48.1638345216	-54 35 45.085719552		11.66	11.07			~	2	0

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