Star - Planet - Debris Disk Alignment in the HD 82943 system: Is planetary system coplanarity actually the norm?

Abstract

Recent results suggest that the two planets in the HD 82943 system are inclined to the sky plane by 20 +/- 4deg. Here, we show that the debris disk in this system is inclined by 27 +/- 4deg, thus adding strength to the derived planet inclinations and suggesting that the planets and debris disk are consistent with being aligned at a level similar to the Solar System. Further, the stellar equator is inferred to be inclined by 28 +/- 4deg, suggesting that the entire star - planet - disk system is aligned, the first time such alignment has been tested for radial velocity discovered planets on ~AU wide orbits. We show that the planet-disk alignment is primordial, and not the result of planetary secular perturbations to the disk inclination. In addition, we note three other systems with planets at >10AU discovered by direct imaging that already have good evidence of alignment, and suggest that empirical evidence of system-wide star - planet - disk alignment is therefore emerging, with the exception of systems that host hot Jupiters. While this alignment needs to be tested in a larger number of systems, and is perhaps unsurprising, it is a reminder that the system should be considered as a whole when considering the orientation of planetary orbits.

Accepted to MNRAS

References in corpus (3)

• Direct Imaging of Multiple Planets Orbiting the Star HR 8799
• Optical Images of an Exosolar Planet 25 Light Years from Earth
• HST/NICMOS detection of HR 8799 b in 1998

Cited by in corpus (24)

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• Alignment in star-debris disc systems seen by Herschel
• The Northern Arc of $\epsilon$ Eridani's Debris Ring as Seen by ALMA
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• Characterizing the Orbital and Dynamical State of the HD 82943 Planetary System With Keck Radial Velocity Data
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• The Debris Disk of Solar Analogue $\tau$ Ceti: Herschel Observations and Dynamical Simulations of the Proposed Multiplanet System
• Exo-zodi modelling for the Large Binocular Telescope Interferometer
• Possible solution to the riddle of HD 82943 multiplanet system: the three-planet resonance 1:2:5?
• Pursuing the planet-debris disk connection: Analysis of upper limits from the Anglo-Australian Planet Search
• The Anglo-Australian Planet Search XXV: A Candidate Massive Saturn Analog Orbiting HD 30177
• A Spin-Orbit Alignment for the Hot Jupiter HATS-3b
• Spin-orbit alignments for Three Transiting Hot Jupiters: WASP-103b, WASP-87b, & WASP-66b
• A Window on Exoplanet Dynamical Histories: Rossiter-McLaughlin Observations of WASP-13b and WASP-32b
• Using warm dust to constrain unseen planets
• Imaged sub-stellar companions: not as eccentric as they appear? The effect of an unseen inner mass on derived orbits
• The big sibling of AU Mic: a cold dust-rich debris disk around CP-72 2713 in the $\beta$ Pic moving group
• Mutual inclinations between giant planets and their debris discs in HD 113337 and HD 38529
• Flybys in debris disk systems with Gaia eDR3
• Radial velocity analysis of stars with debris discs
• AU Mic b is the Youngest Planet to have a Spin-Orbit Alignment Measurement