The Great Escape III: Placing post-main-sequence evolution of planetary and binary systems in a Galactic context

Abstract

Our improving understanding of the life cycle of planetary systems prompts investigations of the role of the Galactic environment before, during and after Asymptotic Giant Branch (AGB) stellar evolution. Here, we investigate the interplay between stellar mass loss, Galactic tidal perturbations, and stellar flybys for evolving stars which host one planet, smaller body or stellar binary companion and reside in the Milky Way's bulge or disc. We find that the potential evolutionary pathways from a main sequence (MS) to a white dwarf (WD) planetary system are a strong function of Galactocentric distance only with respect to the prevalence of stellar flybys. Planetary ejection and collision with the parent star should be more common towards the bulge. At a given location anywhere in the Galaxy, if the mass loss is adiabatic, then the secondary is likely to avoid close flybys during AGB evolution, and cannot eventually escape the resulting WD because of Galactic tides alone. Partly because AGB mass loss will shrink a planetary system's Hill ellipsoid axes by about 20 to 40 per cent, Oort clouds orbiting WDs are likely to be more depleted and dynamically excited than on the MS.

Accepted for publication in MNRAS; 15 pages, 6 figures, 1 table

References in corpus (13)

• The Transiting Circumbinary Planets Kepler-34 and Kepler-35
• Foretellings of Ragnarök: World-engulfing Asymptotic Giants and the Inheritance of White Dwarfs
• The Palomar/Keck Adaptive Optics Survey of Young Solar Analogs: Evidence for a Universal Companion Mass Function
• Survival of a brown dwarf after engulfment by a red giant star
• Dynamics of Planetary Systems in Star Clusters
• Planet Engulfment by ~1.5-3 Solar-Mass Red Giants
• Close encounters in young stellar clusters: implications for planetary systems in the solar neighbourhood
• Injection of Oort Cloud Comets: The Fundamental Role of Stellar Perturbations
• An Exoplanet's Response to Anisotropic Stellar Mass-Loss During Birth and Death
• Can habitable planets form in clustered environments?
• The Role of Planet Accretion in Creating the Next Generation of Red Giant Rapid Rotators
• Main-sequence progenitor configurations of the NN Ser candidate circumbinary planetary system are dynamically unstable
• Habitability in Different Milky Way Stellar Environments: a Stellar Interaction Dynamical Approach

Cited by in corpus (47)

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• The orbital evolution of asteroids, pebbles and planets from giant branch stellar radiation and winds
• Liberating exomoons in white dwarf planetary systems
• Multiple Stellar Evolution: a population synthesis algorithm to model the stellar, binary, and dynamical evolution of multiple-star systems
• Very Wide Binary Stars as the Primary Source of Stellar Collisions in the Galaxy
• An analytic model for mass transfer in binaries with arbitrary eccentricity, with applications to triple-star systems
• The Fate of Exomoons in White Dwarf Planetary Systems
• Galactic Tide and Local Stellar Perturbations on the Oort Cloud: Creation of Interstellar Comets
• The Dynamical Fate of Self-Gravitating Disc Fragments After Tidal Downsizing
• Sublimation-induced orbital perturbations of extrasolar active asteroids and comets: application to white dwarf systems
• Three red giants with substellar-mass companions
• The fates of Solar system analogues with one additional distant planet
• Speeding past planets? Asteroids radiatively propelled by giant branch Yarkovsky effects
• Post-main-sequence debris from rotation-induced YORP break-up of small bodies II: multiple fissions, internal strengths and binary production
• The lifetimes of planetary debris discs around white dwarfs
• Origin of 1I/'Oumuamua. II. An ejected exo-Oort cloud object?
• Oort cloud Ecology II: The chronology of the formation of the Oort cloud
• A hypothesis for the rapid formation of planets
• Binary star influence on post-main-sequence multi-planet stability
• Effects of non-Kozai mutual inclinations on two-planet system stability through all phases of stellar evolution
• Circumbinary exoplanets and brown dwarfs with the Laser Interferometer Space Antenna
• PEWDD: A database of white dwarfs enriched by exo-planetary material
• Significant interstellar object production by close stellar flybys
• Dynamical mass and multiplicity constraints on co-orbital bodies around stars
• The critical binary star separation for a planetary system origin of white dwarf pollution
• Was Proxima captured by alpha Centauri A and B?
• The entry geometry and velocity of planetary debris into the Roche sphere of a white dwarf
• Linking the formation and fate of exo-Kuiper belts within solar system analogues
• The Galactic Interstellar Object Population: A Framework for Prediction and Inference
• Habitability properties of circumbinary planets
• The unstable fate of the planet orbiting the A-star in the HD 131399 triple stellar system
• Search for giant planets around seven white dwarfs in the Hyades cluster with the Hubble Space Telescope
• The post-main-sequence fate of the HR 8799 planetary system
• Disentangling the parameter space: The role of planet multiplicity in triggering dynamical instabilities on planetary systems around white dwarfs
• The grain size survival threshold in one-planet post-main-sequence exoplanetary systems
• Oumuamuas passing through molecular clouds
• Tidal decay of circumbinary planetary systems
• High-resolution resonant portraits of a single-planet white dwarf system
• The New Astronomical Frontier of Interstellar Objects
• A Real-Time Search for Interstellar Impacts on the Moon
• Detecting Interstellar Objects Through Stellar Occultations
• Identifying and characterizing ultracool dwarfs ejected from post-encounter disintegrating systems