摘要：The distribution of spin–orbit angles for systems with wide-separation, tidally detached exoplanets offers a uniqueconstraint on the prevalence of dynamically violent planetary evolution histories. Tidally detached planets providea relatively unbiased view of the primordial stellar obliquity distribution, as they cannot tidally realign within thesystem lifetime. We present the third result from our Stellar Obliquities in Long-period Exoplanet Systems(SOLES) survey: a measurement of the Rossiter–McLaughlin effect across two transits of the tidally detachedwarm Jupiter TOI-1478 b with the WIYN/NEID and Keck/HIRES spectrographs, revealing a sky-projected spin–orbit angle l = - 6.2+5.55.9 . Combining this new measurement with the full set of archival obliquity measurements,including two previous constraints from the SOLES survey, we demonstrate that, in single-star systems, tidallydetached warm Jupiters are preferentially more aligned than closer-orbiting hot Jupiters. This finding has two keyimplications: (1) planets in single-star systems tend to form within aligned protoplanetary disks, and (2) warmJupiters form more quiescently than hot Jupiters, which, in single-star systems, are likely perturbed into amisaligned state through planet–planet interactions in the post-disk-dispersal phase. We also find that lower-massSaturns span a wide range of spin–orbit angles, suggesting a prevalence of planet–planet scattering and/or secularmechanisms in these systems.
