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Unified Kraft Break at ∼6500 K: A Newly Identified Single-star Obliquity Transition Matches the Classical Rotation Break

  • Authors: Xian-Yu Wang, 宪钰 汪, Songhu Wang, 松虎 王, J. M. Joel Ong, 加冕 王

Xian-Yu Wang et al 2026 The Astrophysical Journal Letters 996 .

  • Provider: AAS Journals

Caption: Figure 3.

The λ distributions for hot-Jupiter (3 × 10−4mp/M ≤2 × 10−3, a/R<10), sub-Saturn (3 × 10−5mp/M ≤3 × 10−3), warm-Jupiter (3 × 10−4mp/M ≤2 × 10−3, a/R>11), compact multiplanet (period ratio of adjacent planets, Pi+1/Pi < 6), massive-planet systems (2 × 10−3mp/M), and eccentric Jupiters (3 × 10−4mp/M ≤2 × 10−3, e > 0.1), along with the Kraft break and its associated uncertainty derived in this work. In terms of Teff coverage, only the hot-Jupiter systems have sufficient measurements (>10) in the hot-star regime. Sub-Saturns with nearby companions are marked in blue. The predicted relation between Teff and λ from secular resonance crossing (C. Petrovich et al. 2020; E. Dugan et al. 2025) is shown as the light-blue shaded region.

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