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TOI-1259Ab: A warm Jupiter orbiting a K-dwarf white-dwarf binary on a low-obliquity orbit

Hugo VeldhuisAnton Pannekoek Institute for Astronomy, University of AmsterdamJuan I. Espinoza-RetamalUniversity of AmsterdamGuðmundur StefánssonAnton Pannekoek Institute for Astronomy, University of AmsterdamGudmundur StefanssonAnton Pannekoek Institute for Astronomy, University of AmsterdamAlexander P. StephanDepartment of Physics and Astronomy, Vanderbilt UniversityDavid V. MartinDepartment of Physics and Astronomy, Vanderbilt UniversityDavid BruijneUniversity of AmsterdamSuvrath MahadevanCenter for Exoplanets and Habitable Worlds, The Pennsylvania State UniversityJoshua N. WinnDepartment of Astrophysical Sciences, Princeton UniversityCullen H. BlakeDepartment of Physics and Astronomy, University of PennsylvaniaFei DaiInstitute for Astronomy, University of Hawai’iRachel B. FernandesDepartment of Physics and Astronomy, Tufts UniversityEvan FitzmauriceDepartment of Astronomy & Astrophysics, The Pennsylvania State UniversityEric B. FordCenter for Astrostatistics, 525 Davey Laboratory, The Pennsylvania State UniversityMark R. GiovinazziFive CollegesArvind F. GuptaU.S. National Science Foundation National Optical-Infrared Astronomy Research LaboratorySamuel HalversonJet Propulsion Laboratory, California Institute of TechnologyTe HanDepartment of Physics & Astronomy, The University of CaliforniaDaniel KrolikowskiSteward Observatory, University of ArizonaDaniel M. KrolikowskiSteward Observatory, University of ArizonaJoe P. NinanDepartment of Astronomy and Astrophysics, Tata Institute of Fundamental ResearchJoe NinanDepartment of Astronomy and Astrophysics, Tata Institute of Fundamental ResearchCristóbal PetrovichDepartment of Astronomy, Indiana UniversityPaul RobertsonDepartment of Physics & Astronomy, The University of CaliforniaArpita RoyAstrophysics & Space Institute, Schmidt SciencesChristian SchwabSchool of Mathematical and Physical Sciences, Macquarie UniversityRyan TerrienCarleton CollegeRyan C. TerrienCarleton College

Astronomy and Astrophysicsjournal2026en

ABI

Аннотация

The evolution of one member of a stellar binary into a white dwarf has been proposed as a mechanism that triggers the formation of close-in gas giant planets. The star’s asymmetric mass loss during the Asymptotic Giant Branch stage gives it a velocity recoil or “kick” that can initiate eccentric Lidov–Kozai oscillations, potentially causing a planet around the secondary star to migrate inward and perturb the eccentricity and inclination of its orbit. Here we present a measurement of the stellar obliquity of TOI-1259Ab, a gas giant in a close-in orbit around a K star with a white dwarf companion about 1650 au away. By using the NEID spectrograph to detect the Rossiter-McLaughlin effect during the planetary transit, we find the sky-projected obliquity to be λ = 7 −21 +20° . When combined with estimates of the stellar rotation period, radius, and projected rotation velocity, we find the true 3D obliquity to be ψ = 24 −12 +14° ( ψ < 47 ° at 95% confidence), revealing that the orbit of TOI-1259Ab is on a low-obliquity orbit with respect to the star’s equatorial plane. Because the planet’s orbit is too wide for tidal realignment to be expected, TOI-1259Ab might have formed quiescently in this low-obliquity configuration. Alternatively, as we show with dynamical simulations, eccentric Lidov–Kozai oscillations triggered by the evolution of the binary companion expect to lead to a low-obliquity configuration with a probability of ∼14%.

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Stellar, planetary, and galactic studies Astronomy and Astrophysical Research Scientific Research and Discoveries

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DOI: 10.1051/0004-6361/202556348

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