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Stellar spin-orbit misalignment in a multiplanet system.

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Summary
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Spin-orbit misalignment is not unique to hot Jupiter systems. Asteroseismology revealed a large obliquity for Kepler-56, a red giant with two planets, indicating misalignments occur in broader planetary system configurations.

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Area of Science:

  • Exoplanetary science
  • Stellar astrophysics
  • Asteroseismology

Background:

  • Stars with hot Jupiters often exhibit high obliquities, suggesting dynamical disruption in their formation.
  • Stars with multiple coplanar planets typically show low obliquities, implying disk migration.
  • Kepler-56 is a red giant star with two known transiting coplanar planets.

Purpose of the Study:

  • To investigate spin-orbit alignment in systems beyond those with hot Jupiters.
  • To determine the obliquity of the red giant Kepler-56.
  • To test the hypothesis that wide-orbiting companions can induce misalignments.

Main Methods:

  • Asteroseismology was employed to precisely measure the stellar obliquity of Kepler-56.
  • Analysis of Kepler transit data for the two known planets.
  • Radial velocity measurements were conducted to search for additional companions.

Main Results:

  • Kepler-56 was found to have a large obliquity, challenging the dichotomy between hot Jupiter systems and low-obliquity systems.
  • The study demonstrates that spin-orbit misalignments are not limited to hot Jupiter exoplanet systems.
  • A third, wide-orbiting companion was detected in the Kepler-56 system via radial velocity.

Conclusions:

  • Spin-orbit misalignments can occur in systems with multiple coplanar planets, not just hot Jupiters.
  • The presence of a wide-orbiting companion provides a plausible mechanism for inducing large obliquities.
  • This finding broadens the understanding of planetary system formation and evolution pathways.