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Author (up) Rice, M.; Wang, X.Y.; Wang, S.H.; Shporer, A.; Barkaoui, K.; Brahm, R.; Collins, K.A.; Jordán, A.; Lowson, N.; Butler, R.P.; Crane, J.D.; Shectman, S.; Teske, J.K.; Osip, D.; Collins, K.I.; Murgas, F.; Boyle, G.; Pozuelos, F.J.; Timmermans, M.; Jehin, E.; Gillon, M. doi  openurl
  Title Evidence for Low-level Dynamical Excitation in Near-resonant Exoplanet Systems Type
  Year 2023 Publication Astronomical Journal Abbreviated Journal Astron. J.  
  Volume 166 Issue 6 Pages 266  
  Keywords SPIN-ORBIT ALIGNMENT; MEAN-MOTION RESONANCE; STELLAR SPIN; PLANETARY SYSTEM; WARM-JUPITER; HOT JUPITER; MESA ISOCHRONES; ALIGNED ORBIT; TRANSIT; STAR  
  Abstract The geometries of near-resonant planetary systems offer a relatively pristine window into the initial conditions of exoplanet systems. Given that near-resonant systems have likely experienced minimal dynamical disruptions, the spin-orbit orientations of these systems inform the typical outcomes of quiescent planet formation, as well as the primordial stellar obliquity distribution. However, few measurements have been made to constrain the spin-orbit orientations of near-resonant systems. We present a Rossiter-McLaughlin measurement of the near-resonant warm Jupiter TOI-2202 b, obtained using the Carnegie Planet Finder Spectrograph on the 6.5 m Magellan Clay Telescope. This is the eighth result from the Stellar Obliquities in Long-period Exoplanet Systems survey. We derive a sky-projected 2D spin-orbit angle lambda = 26(-15)(+12 degrees) and a 3D spin-orbit angle Psi = 31(-11)(+13 degrees), finding that TOI-2202 b-the most massive near-resonant exoplanet with a 3D spin-orbit constraint to date-likely deviates from exact alignment with the host star's equator. Incorporating the full census of spin-orbit measurements for near-resonant systems, we demonstrate that the current set of near-resonant systems with period ratios P-2/P-1 less than or similar to 4 is generally consistent with a quiescent formation pathway, with some room for low-level (less than or similar to 20 degrees) protoplanetary disk misalignments or post-disk-dispersal spin-orbit excitation. Our result constitutes the first population-wide analysis of spin-orbit geometries for near-resonant planetary systems.  
  Address  
  Corporate Author Thesis  
  Publisher Place of Publication Editor Data Observatory  
  Language Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 0004-6256 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:001114801100001 Approved  
  Call Number UAI @ alexi.delcanto @ Serial 1932  
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