Detectable close-in planets around white dwarfs through late unpacking

Abstract

Although 25%-50% of white dwarfs (WDs) display evidence for remnant planetary systems, their orbital architectures and overall sizes remain unknown. Vibrant close-in (~1 Solar radius) circumstellar activity is detected at WDs spanning many Gyrs in age, suggestive of planets further away. Here we demonstrate how systems with 4 and 10 closely-packed planets that remain stable and ordered on the main sequence can become unpacked when the star evolves into a WD and experience pervasive inward planetary incursions throughout WD cooling. Our full-lifetime simulations run for the age of the Universe and adopt main sequence stellar masses of 1.5, 2.0 and 2.5 Solar masses, which correspond to the mass range occupied by the progenitors of typical present-day WDs. These results provide (i) a natural way to generate an ever-changing dynamical architecture in post-main-sequence planetary systems, (ii) an avenue for planets to achieve temporary close-in orbits that are potentially detectable by transit photometry, and (iii) a dynamical explanation for how residual asteroids might pollute particularly old WDs.

Accepted for publication in MNRAS

References in corpus (36)

• Direct Imaging of Multiple Planets Orbiting the Star HR 8799
• Dynamical Outcomes of Planet-Planet Scattering
• One or more bound planets per Milky Way star from microlensing observations
• Planet formation around stars of various masses: The snow line and the frequency of giant planets
• Origins of Eccentric Extrasolar Planets: Testing the Planet-Planet Scattering Model
• Tidal dissipation in stars and giant planets
• The frequency of planetary debris around young white dwarfs
• A gaseous metal disk around a white dwarf
• The Initial-Final Mass Relation: Direct Constraints at the Low Mass End
• The initial-final mass relationship of white dwarfs revisited: effect on the luminosity function and mass distribution
• Foretellings of Ragnarök: World-engulfing Asymptotic Giants and the Inheritance of White Dwarfs
• Hot Jupiters and Cool Stars
• Distant future of the Sun and Earth revisited
• Formation of planetary debris discs around white dwarfs I: Tidal disruption of an extremely eccentric asteroid
• Post-Oligarchic Evolution of Protoplanetary Embryos and the Stability of Planetary Systems
• Effects of Orbital Eccentricity on Extrasolar Planet Transit Detection and Lightcurves
• Stability Limits in Extra-solar Planetary Systems
• SDSSJ104341.53+085558.2: A second white dwarf with a gaseous debris disc
• Planet-planet scattering in planetesimal disks
• Transit surveys for Earths in the habitable zones of white dwarfs
• The GENGA Code: Gravitational Encounters in N-body simulations with GPU Acceleration
• Signs of a faint disc population at polluted white dwarfs
• Variable Emission from a Gaseous Disc around a Metal-Polluted White Dwarf
• Hydrogen delivery onto white dwarfs from remnant exo-Oort cloud comets
• Detection limits for close eclipsing and transiting sub-stellar and planetary companions to white dwarfs in the WASP survey
• High resolution optical spectroscopy of Praesepe white dwarfs
• The Drop during Less than 300 days of a Dusty White Dwarf's Infrared Luminosity
• A search for planetary eclipses of white dwarfs in the Pan-STARRS1 medium-deep fields
• Dynamical behaviour of multiplanet systems close to their stability limit
• Stability criteria for hierarchical triple systems
• Predictions for the correlation between giant and terrestrial extrasolar planets in dynamically evolved systems
• Understanding the assembly of Kepler's compact planetary systems
• Secular Evolution of HD 12661: A System Caught at an Unlikely Time
• Secular Effects of Tidal Damping in Compact Planetary Systems
• A simple bound for the variation at closest approach of a small body and star due to general relativity
• Finding rocky asteroids around white dwarfs by their periodic thermal emission

Cited by in corpus (48)

• A Giant Planet Candidate Transiting a White Dwarf
• A planetesimal orbiting within the debris disc around a white dwarf star
• Accretion of a giant planet onto a white dwarf
• Cool DZ white dwarfs I: Identification and spectral analysis
• Planetary engulfment as a trigger for white dwarf pollution
• Numerical Simulations of Collisional Cascades at the Roche Limits of White Dwarf Stars
• Explaining the variability of WD 1145+017 with simulations of asteroid tidal disruption
• Tidal disruption of planetary bodies by white dwarfs I: A hybrid SPH-analytical approach
• Destruction of Refractory Carbon in Protoplanetary Disks
• The orbital evolution of asteroids, pebbles and planets from giant branch stellar radiation and winds
• Does a Differentiated, Carbonate-Rich, Rocky Object Pollute the White Dwarf SDSSJ104341.53+085558.2?
• Tidal disruption of planetary bodies by white dwarfs II: Debris disc structure and ejected interstellar asteroids
• The occurrence of planets and other substellar bodies around white dwarfs using K2
• The Fate of Exomoons in White Dwarf Planetary Systems
• Numerical Simulations of Gaseous Disks Generated from Collisional Cascades at the Roche Limits of White Dwarf Stars
• The White Dwarf Opportunity: Robust Detections of Molecules in Earth-like Exoplanet Atmospheres with the James Webb Space Telescope
• Another one grinds the dust: Variability of the planetary debris disc at the white dwarf SDSS J104341.53+085558.2
• Circularization of tidal debris around white dwarfs: implications for gas production and dust variability
• The fates of Solar system analogues with one additional distant planet
• Speeding past planets? Asteroids radiatively propelled by giant branch Yarkovsky effects
• Mass and eccentricity constraints on the planetary debris orbiting the white dwarf WD 1145+017
• Linking long-term planetary $N$-body simulations with periodic orbits: application to white dwarf pollution
• The lifetimes of planetary debris discs around white dwarfs
• Do instabilities in high-multiplicity systems explain the existence of close-in white dwarf planets?
• How Jupiters save or destroy inner Neptunes around evolved stars
• Understanding the origin of white dwarf atmospheric pollution by dynamical simulations based on detected three-planet systems
• Binary star influence on post-main-sequence multi-planet stability
• Orbital relaxation and excitation of planets tidally interacting with white dwarfs
• Circumbinary exoplanets and brown dwarfs with the Laser Interferometer Space Antenna
• The dynamical history of the evaporating or disrupted ice giant planet around white dwarf WD J0914+1914
• Post main sequence evolution of icy minor planets II: water retention and white dwarf pollution around massive progenitor stars
• Post-main-sequence evolution of icy minor planets. III. water retention in dwarf planets and exo-moons and implications for white dwarf pollution
• An Extreme-AO Search for Giant Planets around a White Dwarf --VLT/SPHERE performance on a faint target GD 50
• Magnetic dynamos in white dwarfs -- II. Relating magnetism and pollution
• Survivability of radio-loud planetary cores orbiting white dwarfs
• The critical binary star separation for a planetary system origin of white dwarf pollution
• Constraining planet formation around 6$M_{\odot }$-8$M_{\odot }$ stars
• The smallest planetary drivers of white dwarf pollution
• Spectral analysis of cool white dwarfs accreting from planetary systems: from the UV to the optical
• White dwarf planetary debris dependence on physical structure distributions within asteroid belts
• H${}_2$-dominated Atmosphere as an Indicator of Second-generation Rocky White Dwarf Exoplanets
• The unstable fate of the planet orbiting the A-star in the HD 131399 triple stellar system
• Disentangling the parameter space: The role of planet multiplicity in triggering dynamical instabilities on planetary systems around white dwarfs
• Birth cluster simulations of planetary systems with multiple super-Earths: initial conditions for white dwarf pollution drivers
• Can there be additional rocky planets in the Habitable Zone of tight binary stars with a known gas giant?
• Short-term stability of particles in the WD J0914+1914 white dwarf planetary system
• High-resolution resonant portraits of a single-planet white dwarf system
• Binary asteroid scattering around white dwarfs