Search for Stellar Flybys in the Sco-Cen OB Association with the Gaia DR2

Abstract

High-contrast imaging studies of debris disks have revealed a significant diversity in their morphologies, including large-scale asymmetries. Theories involving stellar flybys, an external source of gravitational disturbance, have offered a plausible explanation for the origin of these morphological variations. Our study is an experiment to gain empirical evidence that has been lacking from such theories. We explore this paradigm by using astrometric and radial velocity measurements from the Gaia DR2 and ground-based observations to trace the trajectories of 625 stars in the Sco-Cen OB Association from 5 Myr in the past to 2 Myr in the future. We identified 119 stars that had at least one past flyby event occurring within one Hill radius, and 23 of these experienced flybys within 0.5 Hill radius. We found no evidence of a significant correlation between the presence of flyby events and infrared excess detections, although the sample is not uniformly sensitive to infrared excess emission. Ten stars that had past flyby events host resolved circumstellar disks that appear relatively symmetric in the existing data except for the circumbinary disk surrounding HD 106906. We determined the trajectory and relative velocity of each of these flyby events, and compared these to the geometry of the spatially-resolved disks. Future work is needed to measure the kinematics of lower mass stars and to improve sensitivity to circumstellar disks for the entire sample.

References in corpus (86)

• Gaia Data Release 2. Summary of the contents and survey properties
• Modules for Experiments in Stellar Astrophysics (MESA)
• Modules for Experiments in Stellar Astrophysics (MESA): Giant Planets, Oscillations, Rotation, and Massive Stars
• MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
• Intrinsic Colors, Temperatures, and Bolometric Corrections of Pre-Main Sequence Stars
• MESA Isochrones and Stellar Tracks (MIST) 0: Methods for the construction of stellar isochrones
• A Hipparcos census of the nearby OB associations
• Planet-disk interaction and orbital evolution
• BANYAN. XI. The BANYAN $\Sigma$ multivariate Bayesian algorithm to identify members of young associations within 150 pc
• Spin-orbit angle measurements for six southern transiting planets; New insights into the dynamical origins of hot Jupiters
• The Star-formation History and Accretion-Disk Fraction Among the K-Type Members of the Scorpius-Centaurus OB Association
• The RAdial Velocity Experiment (RAVE): Fourth data release
• Pulkovo Compilation of Radial Velocities for 35495 Hipparcos Stars in a Common System
• ALMA Observations of Circumstellar Disks in the Upper Scorpius OB Association
• The effects of fly-bys on planetary systems
• The Disk Population of the Upper Scorpius Association
• Astrophysical supplements to the ASCC-2.5. Ia. Radial velocities of about 55000 stars and mean radial velocities of 516 Galactic open clusters and associations
• HD 106906 b: A planetary-mass companion outside a massive debris disk
• Evidence for early stellar encounters in the orbital distribution of Edgeworth-Kuiper Belt objects
• Planet-planet scattering in planetesimal disks II: Predictions for outer extrasolar planetary systems
• Stellar encounters as the origin of distant solar system objects in highly eccentric orbits
• The Kinematics of the Scorpius-Centaurus OB Association from Gaia DR1
• Flybys in protoplanetary discs: I. Gas and dust dynamics
• 99 Herculis: Host to a Circumbinary Polar-ring Debris Disk
• Debris Disks in the Scorpius-Centaurus OB Association Resolved by ALMA
• New Members of the Scorpius Centaurus Complex and Ages of its sub-regions
• Subaru Imaging of Asymmetric Features in a Transitional Disk in Upper Scorpius
• Excitation and Propagation of Eccentricity Disturbances in Planetary Systems
• Disk Evolution Study Through Imaging of Nearby Young Stars (DESTINYS): Late infall causing disk misalignment and dynamic structures in SU Aur
• A triple star system with a misaligned and warped circumstellar disk shaped by disk tearing
• Refining the Census of the Upper Scorpius Association with Gaia
• The effects of dynamical interactions on planets in young substructured star clusters
• Measurement of Circumstellar Disk Sizes in the Upper Scorpius OB Association with ALMA
• A Spitzer Study of Dusty Disks in the Scorpius-Centaurus OB Association
• The VLT/NaCo Large program to probe the occurrence of exoplanets and brown dwarfs in wide orbits: I- Sample definition and characterization
• The CORALIE survey for southern extra-solar planets XV. Discovery of two eccentric planets orbiting HD4113 and HD156846
• Stellar Companions and the Age of HD 141569 and its Circumstellar Disk
• The stellar population of Sco OB2 revealed by Gaia DR2 data
• A narrow, edge-on disk resolved around HD 106906 with SPHERE
• The Closest Known Flyby of a Star to the Solar System
• Close stellar encounters with planetesimal discs: The dynamics of asymmetry in the Beta Pictoris system
• A Comprehensive Census of Nearby Infrared Excess Stars
• Protoplanetary disc evolution affected by star-disc interactions in young stellar clusters
• Disks Around T Tauri Stars with SPHERE (DARTTS-S) II: Twenty-one new polarimetric images of young stellar disks
• Flybys in protoplanetary discs: II. Observational signatures
• Imaging Discovery of the Debris Disk Around HIP 79977
• Search for associations containing young stars (SACY):II. Chemical abundances of stars in 11 young Associations in the Solar neighborhood
• Comparison of the dust and gas radial structure in the transition disk [PZ99] J160421.7-213028
• Reference star differential imaging of close-in companions and circumstellar disks with the NIRC2 vortex coronagraph at W.M. Keck Observatory
• Multiple Stellar Fly-Bys Sculpting the Circumstellar Architecture in RW Aurigae
• Variable Outer Disk Shadowing Around the Dipper Star RX J1604.3-2130
• 870 micron Imaging of a Transitional Disk in Upper Scorpius: Holdover from the Era of Giant Planet Formation?
• Structuring the HD 141569 A circumstellar dust disk. Impact of eccentric bound stellar companions
• The GRAVITY Young Stellar Object survey -- I. Probing the disks of Herbig Ae/Be stars in terrestrial orbits
• The SUPERWIDE Catalog: A Catalog of 99,203 Wide Binaries Found in Gaia and Supplemented by the SUPERBLINK High Proper Motion Catalog
• Are Inner Disc Misalignments Common? ALMA Reveals an Isotropic Outer Disc Inclination Distribution for Young Dipper Stars
• The Sizes and Depletions of the Dust and Gas Cavities in the Transitional Disk J160421.7-213028
• The SEEDS High Contrast Imaging Survey of Exoplanets around Young Stellar Objects
• Parameter Study of Star-Discs Encounters
• New stellar encounters discovered in the second Gaia data release
• A catalog of wide binary and multiple systems of bright stars from Gaia-DR2 and the Virtual Observatory
• The tidal disruption of protoplanetary accretion discs
• A family portrait of disk inner rims around Herbig Ae/Be stars: Hunting for warps, rings, self shadowing, and misalignments in the inner astronomical units
• Variability and dust filtration in the transition disk J160421.7-213028 observed in optical scattered light
• Investigating the flyby scenario for the HD 141569 system
• Dipper disks not inclined towards edge-on orbits
• Outer solar system possibly shaped by a stellar fly-by
• The SHARDDS survey: first resolved image of the HD114082 debris disk in Lower Centaurus Crux with SPHERE
• A Correlation Between Circumstellar Disks and Rotation in the Upper Scorpius OB Association
• A significant mutual inclination between the planets within the $\pi$ Mensae system
• Protoplanetary Disc Response to Distant Tidal Encounters in Stellar Clusters
• On the origin of the wide-orbit circumbinary giant planet HD 106906: A dynamical scenario and its impact on the disk
• A Dynamical Simulation of the Debris Disk Around HD 141569A
• Young Stars with SALT
• HD 106906: A Case Study for External Perturbations of a Debris Disk
• Stripping a debris disk by close stellar encounters in an open stellar cluster
• First detection of orbital motion for HD 106906 b: A wide-separation exoplanet on a Planet Nine-like orbit
• A Near-coplanar Stellar Flyby of the Planet Host Star HD 106906
• SCExAO/CHARIS Near-IR High-Contrast Imaging and Integral Field Spectroscopy of the HIP 79977 Debris Disk
• Isochronal age-mass discrepancy of young stars: SCExAO/CHARIS integral field spectroscopy of the HIP 79124 triple system
• Stellar Encounters with the Beta Pictoris Planetesimal System
• VLT/SPHERE Multi-Wavelength High-Contrast Imaging of the HD 115600 Debris Disk: New Constraints on the Dust Geometry and the Presence of Young Giant Planets
• Absolute Parameters of YOung Stars: GG Lup and mu^1 Sco
• Spectroscopic orbits of subsystems in multiple stars. IV. Double-lined pairs
• Yes, multi-periodic dwarfs in Upper Scorpius are binaries
• Numerical search for a potential planet sculpting the young disc of HD 115600

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• Fundamental limits to orbit reconstruction due to non-conservation of stellar actions in a Milky Way-like simulation