Flybys in debris disk systems with Gaia eDR3

Abstract

We aim to observationally and statistically constrain the influence of flybys in the formation and evolution of debris disks. We compiled a sample of 254 debris disks with ages between 2 Myr and 8 Gyr that are either part of an association or isolated, drawing the binary and planetary companions of the systems mainly from the literature. Using the Gaia eDR3 astrometric data and radial velocities of our sample, as well as all the sources in a specific region of the sky, we reconstructed the relative linear motions in the last 5 Myr and made predictions for the next 2 Myr. Relating the Hill radius of each debris disk system and the closest distances reached by the two sources, we defined the flyby events in terms of position and time. We find that in the period between the last 5 Myrs and the next 2 Myrs, 90% of the analyzed systems have experienced at least a close flyby, while 7% of them have experienced flybys at distances greater than 0.5R Hill. In particular, 75% of them have experienced at least one past close encounter and 36% multiple past close encounters. From the sub-sample of resolved debris disk (41 out of 94), 80% of the analyzed systems experience at least an encounter within 0.8 pc. From the subsample of 10 debris disks with planets, half of these systems do show misalignments between disk and planet, stirring, or asymmetries. Systems with a misalignment between the planetary orbit and the disk do indeed experience at least one flyby event. In particular, when the planet orbits have a difference with the disk inclination higher than about 20 degree, as in the case of HD 38529, we find that multiple close encounters have taken place in the last 5 Myr, as theoretically predicted. The high incidence of encounters, particularly close encounters, experienced by the systems in the last 5 Myr suggests the fundamental impact of flybys on the evolution of debris disks.

arXiv comment9 pages, 2 figures

References in corpus (36)

• The Gaia mission
• The Revised TESS Input Catalog and Candidate Target List
• The Circular Velocity Curve of the Milky Way from $5$ to $25$ kpc
• Transience of hot dust around sun-like stars
• Debris Disks: Structure, Composition, and Variability
• A planet within the debris disk around the pre-main-sequence star AU Microscopii
• CO emission from discs around isolated HAeBe and Vega-excess stars
• Resolved Debris Discs Around A Stars in the Herschel DEBRIS Survey
• Flybys in protoplanetary discs: I. Gas and dust dynamics
• New Members of the Scorpius Centaurus Complex and Ages of its sub-regions
• New constraints on the planetary system around the young active star AU Mic. Two transiting warm Neptunes near mean-motion resonance
• Discovery of extreme asymmetry in the debris disk surrounding HD 15115
• Close stellar encounters with planetesimal discs: The dynamics of asymmetry in the Beta Pictoris system
• Flybys in protoplanetary discs: II. Observational signatures
• Discovery of a Substellar Companion to the Nearby Debris Disk Host HR 2562
• Stirring in massive, young debris discs from spatially resolved Herschel images
• A Direct Imaging Survey of Spitzer detected debris disks: Occurrence of giant planets in dusty systems
• Locating the planetesimals belts in the multiple-planet systems HD 128311, HD 202206, HD 82943 and HR 8799
• Flares, Rotation, and Planets of the AU Mic System from TESS Observations
• Planetary embryos and planetesimals residing in thin debris disks
• Insights into the planetary dynamics of HD 206893 with ALMA
• Kuiper belt structure around nearby super-Earth host stars
• The completeness-corrected rate of stellar encounters with the Sun from the first Gaia data release
• ALMA study of the HD 100453 AB system and the tidal interaction of the companion with the disk
• High resolution ALMA and HST images of q${}^1$ Eri: an asymmetric debris disc with an eccentric Jupiter
• Evidence for at least three planet candidates orbiting HD20794
• Star - Planet - Debris Disk Alignment in the HD 82943 system: Is planetary system coplanarity actually the norm?
• A Near-coplanar Stellar Flyby of the Planet Host Star HD 106906
• Effects of stellar flybys on planetary systems: 3D modeling of the circumstellar disks damping effects
• Herschel Observations of Dusty Debris Disks
• Impact of planetesimal eccentricities and material strength on the appearance of eccentric debris disks
• Debris Disks in Multi-Planet Systems: Are Our Inferences Compromised by Unseen Planets?
• Mutual inclinations between giant planets and their debris discs in HD 113337 and HD 38529
• Formation History of HD106906 and the Vertical Warping of Debris Disks by an External Inclined Companion
• Search for Stellar Flybys in the Sco-Cen OB Association with the Gaia DR2
• Debris discs in binaries: morphology and photometric signatures

Cited by in corpus (3)

• The ALMA survey to Resolve exoKuiper belt Substructures (ARKS) I: Motivation, sample, data reduction, and results overview
• Planetary system architectures with low-mass inner planets: Direct imaging exploration of mature systems beyond 1 au
• Implications for the formation of Oort cloud-like structures and interstellar comets in dense environments