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

Heitzmann, Alexis and Zhou, George ORCID: and Quinn, Samuel N. and Marsden, Stephen C. ORCID: and Wright, Duncan ORCID: and Petit, Pascal and Vanderburg, Andrew M. and Bouma, Luke G. and Mann, Andrew W. and Rizzuto, Aaron C. (2021) The Obliquity of HIP 67522 b: A 17 Myr Old Transiting Hot, Jupiter-sized Planet. The Astrophysical Journal Letters, 922 (1):L1. pp. 1-6. ISSN 2041-8205

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HIP 67522 b is a 17 Myr old, close-in (P orb = 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 | λ | = 5.8-5.7+2.8 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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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Sciences (6 Sep 2019 - 31 Dec 2021)
Date Deposited: 14 Apr 2022 01:27
Last Modified: 31 May 2022 00:44
Uncontrolled Keywords: Exoplanet astronomy (486); Exoplanet systems (484); Planetaryalignment (1243); Planet formation (1241); Radial velocity (1332); Transit photometry (1709)
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
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