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The Obliquity of HIP 67522 b: A 17 Myr Old Transiting Hot, Jupiter-sized Planet

Abstract : HIP 67522 b is a 17 Myr old, close-in (Porb = 6.96 days), Jupiter-sized (R = 10 R) transiting planet orbiting a Sun-like star in the Sco-Cen OB association. We present our measurement of the system's projected orbital obliquity via two spectroscopic transit observations using the CHIRON spectroscopic facility. We present a global model that accounts for large surface brightness features typical of such young stars during spectroscopic transit observations. With a value of $| \lambda | ={5.8}_{-5.7}^{{+2.8}^\circ} $ it is unlikely that this well-aligned system is the result of a high-eccentricity-driven migration history. By being the youngest planet with a known obliquity, HIP 67522 b holds a special place in contributing to our understanding of giant planet formation and evolution. Our analysis shows the feasibility of such measurements for young and very active stars.
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Submitted on : Thursday, May 19, 2022 - 4:41:46 PM
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Alexis Heitzmann, George Zhou, Samuel N. Quinn, Stephen C. Marsden, Duncan Wright, et al.. The Obliquity of HIP 67522 b: A 17 Myr Old Transiting Hot, Jupiter-sized Planet. The Astrophysical Journal Letters, 2021, 922, ⟨10.3847/2041-8213/ac3485⟩. ⟨insu-03672381⟩

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