Orbital Architectures of Planet-Hosting Binaries II. Low Mutual Inclinations Between Planetary and Stellar Orbits

Abstract

Planet formation is often considered in the context of one circumstellar disk around one star. Yet stellar binary systems are ubiquitous, and thus a substantial fraction of all potential planets must form and evolve in more complex, dynamical environments. We present the results of a five-year astrometric monitoring campaign studying 45 binary star systems that host Kepler planet candidates. The planet-forming environments in these systems would have literally been shaped by the binary orbits that persist to the present day. Crucially, the mutual inclinations of star-planet orbits can only be addressed by a statistical sample. We describe in detail our sample selection and Keck/NIRC2 laser guide star adaptive optics observations collected from 2012 to 2017. We measure orbital arcs, with a typical accuracy of ~0.1 mas/yr, that test whether the binary orbits tend to be aligned with the edge-on transiting planet orbits. We rule out randomly-distributed binary orbits at 4.7$\sigma$, and we show that low mutual inclinations are required to explain the observed orbital arcs. If the stellar orbits have a field binary-like eccentricity distribution, then the best match to our observed orbital arcs is a distribution of mutual inclinations ranging from 0-30 degrees. We discuss the implications of such widespread planet-binary alignment in the theoretical context of planet formation and circumstellar disk evolution.

arXiv commentAccepted to MNRAS

References in corpus (76)

• MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
• A Survey of Stellar Families: Multiplicity of Solar-Type Stars
• Shrinking binary and planetary orbits by Kozai cycles with tidal friction
• Stellar Multiplicity
• Mind your Ps and Qs: the Interrelation between Period (P) and Mass-ratio (Q) Distributions of Binary Stars
• Long-Term Stability of Planets in Binary Systems
• Architecture and Dynamics of Kepler's Candidate Multiple Transiting Planet Systems
• Kepler-16: A Transiting Circumbinary Planet
• Hot Jupiters from Secular Planet--Planet Interactions
• Stellar, brown dwarf and multiple star properties from a radiation hydrodynamical simulation of star cluster formation
• A million binaries from Gaia eDR3: sample selection and validation of Gaia parallax uncertainties
• Analysis of isoplanatic high resolution stellar fields by Starfinder code
• A Planetary Companion to gamma Cephei A
• Eccentricity from transit photometry: small planets in Kepler multi-planet systems have low eccentricities
• The Role of Multiplicity in Disk Evolution and Planet Formation
• Asteroseismology and Gaia: Testing Scaling Relations Using 2200 Kepler Stars with TGAS Parallaxes
• The Impact of Stellar Multiplicity on Planetary Systems, I.: The Ruinous Influence of Close Binary Companions
• The Kepler Follow-Up Observation Program. I. A Catalog of Companions to Kepler Stars from High-Resolution Imaging
• Improving Galactic Center Astrometry by Reducing the Effects of Geometric Distortion
• SOAR TESS Survey. I: Sculpting of TESS planetary systems by stellar companions
• Mapping the Shores of the Brown Dwarf Desert I.: Upper Scorpius
• They are Small Worlds After All: Revised Properties of Kepler M Dwarf Stars and their Planets
• Individual Dynamical Masses of Ultracool Dwarfs
• TrES-2: The First Transiting Planet in the Kepler Field
• Observational Implications of Precessing Protostellar Discs and Jets
• Planetary System Disruption by Galactic Perturbations to Wide Binary Stars
• KIC 9632895 - The 10th Kepler Transiting Circumbinary Planet
• The Kepler Dichotomy among the M Dwarfs: Half of Systems Contain Five or More Coplanar Planets
• Influence of Stellar Multiplicity On Planet Formation. I. Evidence of Suppressed Planet Formation Due to Stellar Companions Within 20 AU and Validation of Four Planets From the Kepler Multiple Planet Candidates
• Formation of close binaries by disc fragmentation and migration, and its statistical modeling
• Terrestrial Planet Formation Around Individual Stars Within Binary Star Systems
• Dynamical Formation of Close Binaries During the Pre-main-sequence Phase
• Primordial Circumstellar Disks in Binary Systems: Evidence for Reduced Lifetimes
• On the Abundance of Circumbinary Planets
• Impact of Binary Stars on Planet Statistics -- I. Planet Occurrence Rates, Trends with Stellar Mass, and Wide Companions to Hot Jupiter Hosts
• Close companions around young stars
• KH 15D: Gradual Occultation of a Pre-Main-Sequence Binary
• The Degree of Alignment Between Circumbinary Disks and Their Binary Hosts
• Keck Laser Guide Star Adaptive Optics Monitoring of 2MASS J1534-2952AB: First Dynamical Mass Determination of a Binary T Dwarf
• The statistical properties of stars and their dependence on metallicity
• Resonance Overlap is Responsible for Ejecting Planets in Binary Systems
• Polar alignment of a protoplanetary disk around an eccentric binary
• Truncated Disks in TW Hya Association Multiple Star Systems
• The ELODIE survey for northern extra-solar planets IV. HD196885, a close binary star with a 3.7-year planet
• Orbital Architectures of Planet-Hosting Binaries: I. Forming Five Small Planets in the Truncated Disk of Kepler-444A
• The Prograde Orbit of Exoplanet TrES-2b
• Habitable Planet Formation in Binary-Planetary Systems
• On the Likelihood of Planet Formation in Close Binaries
• Four new wide binaries among exoplanet host stars
• Star Hoppers: Planet Instability and Capture in Evolving Binary Systems
• The Formation and Evolution of Wide-Orbit Stellar Multiples In Magnetized Clouds
• A disk-driven resonance as the origin of high inclinations of close-in planets
• Uncovering Circumbinary Planetary Architectural Properties from Selection Biases
• Planet formation in binaries: dynamics of planetesimals perturbed by the eccentric protoplanetary disk and the secondary
• The BEBOP radial-velocity survey for circumbinary planets I. Eight years of CORALIE observations of 47 single-line eclipsing binaries and abundance constraints on the masses of circumbinary planets
• Robo-AO Kepler Planetary Candidate Survey III: Adaptive Optics Imaging of 1629 Kepler Exoplanet Candidate Host Stars
• Planet formation in stellar binaries I: planetesimal dynamics in massive protoplanetary disks
• Planetesimal collisions in binary systems
• Impact of Stellar Dynamics on the Frequency of Giant Planets in Close Binaries
• Orbital Motion in Pre-Main Sequence Binaries
• Dynamical Masses of Young Stars I: Discordant Model Ages of Upper Scorpius
• An alpha theory of time-dependent warped accretion discs
• Orbital Parameter Determination for Wide Stellar Binary Systems in the Age of Gaia
• WISE J072003.20-084651.2B Is A Massive T Dwarf
• Effects of Disk Warping on the Inclination Evolution of Star-Disk-Binary Systems
• The Evolution of Planet-Disk Systems That Are Mildly Inclined to the Orbit of a Binary Companion
• Constraining the orbits of sub-stellar companions imaged over short orbital arcs
• The Effect of Binarity on Circumstellar Disk Evolution
• The Gold Standard: Accurate Stellar and Planetary Parameters for Eight Kepler M dwarf Systems Enabled by Parallaxes
• The spin-orbit alignment of visual binaries
• A coplanar circumbinary protoplanetary disk in the TWA 3 triple M dwarf system
• Speckle observations and orbits of multiple stars
• The Identification of 93 Day Periodic Photometric Variability for YSO YLW 16A
• On the Stellar Companion to the Exoplanet Hosting Star 30 Arietis B
• Multi-planet disc interactions in binary systems
• Double stars and astrometric uncertainties in Gaia DR1

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• Stellar obliquities in exoplanetary systems
• High-Eccentricity Migration with Disk-Induced Spin-Orbit Misalignment: a Preference for Perpendicular Hot Jupiters
• The Orbital Architecture of Qatar-6: A Fully Aligned 3-Body System?
• Eccentricity dynamics of wide binaries -- I. The effect of Galactic tides
• ARMADA II: Further Detections of Inner Companions to Intermediate Mass Binaries with Micro-Arcsecond Astrometry at CHARA and VLTI
• A third star in the HAT-P-7 system, and a new dynamical pathway to misaligned hot Jupiters
• The McDonald Accelerating Stars Survey (MASS): Architecture of the Ancient Five-Planet Host System Kepler-444
• Worlds Next Door: A Candidate Giant Planet Imaged in the Habitable Zone of $\alpha$ Cen A. I. Observations, Orbital and Physical Properties, and Exozodi Upper Limits
• Dynamical Architectures of S-type Transiting Planets in Binaries I: Target Selection using Hipparcos and Gaia proper motion anomalies
• BEAST detection of a brown dwarf and a low-mass stellar companion around the young bright B star HIP 81208
• Planet Hunters TESS V: a planetary system around a binary star, including a mini-Neptune in the habitable zone
• Stellar Obliquity Excitation via Disk Dispersal-Driven Resonances in Binaries
• Planetary Edge Trends (PET). I. The Inner Edge-Stellar Mass Correlation
• Dynamical Architectures of S-type Transiting Planets in Binaries II: A Dichotomy in Orbital Alignment of Small Planets in Close Binary Systems
• The Formation of Double Hot Jupiter Systems through von Zeipel-Lidov-Kozai Migration
• Radial velocity analysis of stars with debris discs
• The influence of tight binaries on proto-planetary disk masses
• Formation of massive multiple-star systems: early migration and mergers