Interstellar Meteors from Tidal Disruption of Rocky Planets on Eccentric Orbits Around M Dwarfs

Abstract

Low-mass stars appear to frequently host planetary systems. When these rocky planets develop high eccentricities as a result of secular torques or dynamical scatterings, they occasionally pass close to the host star. In these close passages, planets can be tidally disrupted, and sheared into bound and unbound debris tails. To suffer such a disruption the stellar density must by higher than the planetary density. This condition is met for the most common star and planet systems, M-dwarf stars hosting rocky planets. We describe the dynamics of a tidal disruption, and estimate the typical velocities of unbound ejecta. We simulate the gas dynamics of a planetary tidal disruption, and show that disruptions preserve the layered structure of a rocky body, with the outermost layers flung into interstellar space with the highest velocities. We compare these properties to that of the candidate interstellar meteoroid CNEOS-2014-01-08 (IM1). IM1's approximately 60~km~s${}^{-1}$ excess speed relative to the local standard of rest is naturally reproduced by the unbound debris of the disruption of an Earth-like planet around an M-dwarf star. We suggest that such an encounter might explain the interstellar kinematics of IM1, and its unusual composition, especially if it originated in the fastest-expelled crust of a differentiated rocky planet. Finally, we estimate that the disruption of $\sim 10M_{\oplus }$ reservoirs of rocky planets per M-dwarf are needed to reproduce the inferred rate of IM1-like objects.

arXiv commentAuthor's revised version, accepted for publication in A & A

References in corpus (55)

• MESA Isochrones and Stellar Tracks (MIST). I: Solar-Scaled Models
• Seven temperate terrestrial planets around the nearby ultracool dwarf star TRAPPIST-1
• A terrestrial planet candidate in a temperate orbit around Proxima Centauri
• The Eccentric Kozai-Lidov Effect and Its Applications
• The Athena++ Adaptive Mesh Refinement Framework: Design and Magnetohydrodynamic Solvers
• Hydrodynamical Simulations to Determine the Feeding Rate of Black Holes by the Tidal Disruption of Stars: The Importance of the Impact Parameter and Stellar Structure
• A disintegrating minor planet transiting a white dwarf
• Are There Unstable Planetary Systems Around White Dwarfs?
• Ancient planetary systems are orbiting a large fraction of white dwarf stars
• The Chemical Composition of an Extrasolar Minor Planet
• The Link Between Planetary Systems, Dusty White Dwarfs, and Metal Polluted White Dwarfs
• Circumstellar Debris and Pollution at White Dwarf Stars
• Consequences of Strong Compression in Tidal Disruption Events
• Dynamical effects of stellar mass loss on a Kuiper-like belt
• Finite, Intense Accretion Bursts from Tidal Disruption of Stars on Bound Orbits
• Formation of planetary debris discs around white dwarfs I: Tidal disruption of an extremely eccentric asteroid
• Consequences of the Ejection and Disruption of Giant Planets
• A Giant Planet Candidate Transiting a White Dwarf
• Eccentric Planets and Stellar Evolution as a Cause of Polluted White Dwarfs
• Cool DZ white dwarfs II: Compositions and evolution of old remnant planetary systems
• Tidal Interactions and Disruptions of Giant Planets on Highly Eccentric Orbits
• A candidate super-Earth planet orbiting near the snow line of Barnard's star
• Long-term evolution of three-planet systems to the post-Main Sequence and beyond
• A candidate short-period sub-Earth orbiting Proxima Centauri
• A giant exoplanet orbiting a very low-mass star challenges planet formation models
• Stochastic accretion of planetesimals onto white dwarfs: constraints on the mass distribution of accreted material from atmospheric pollution
• The scatter of the M dwarf mass-radius relationship
• Evolution of OH and CO-dark Molecular Gas Fraction Across a Molecular Cloud Boundary In Taurus
• Detectable close-in planets around white dwarfs through late unpacking
• Drifting Asteroid Fragments Around WD 1145+017
• High-speed photometry of the disintegrating planetesimals at WD1145+017: evidence for rapid dynamical evolution
• A temperate exo-Earth around a quiet M dwarf at 3.4 parsecs
• An Exoplanet's Response to Anisotropic Stellar Mass-Loss During Birth and Death
• Planetary engulfment as a trigger for white dwarf pollution
• Planetary system LHS 1140 revisited with ESPRESSO and TESS
• Star Hoppers: Planet Instability and Capture in Evolving Binary Systems
• Tidal disruption of planetary bodies by white dwarfs I: A hybrid SPH-analytical approach
• On the Survivability and Metamorphism of Tidally Disrupted Giant Planets: the Role of Dense Cores
• Tidal disruption of planetary bodies by white dwarfs II: Debris disc structure and ejected interstellar asteroids
• Tidal fragmentation as the origin of 1I/2017 U1 ('Oumuamua)
• The SOPHIE search for northern extrasolar planets. XIV. A temperate ($T_{\mathrm{eq}}\sim 300$ K) super-earth around the nearby star Gliese 411
• Gray transits of WD 1145+017 over the visible band
• Planetary Engulfment in the Hertzsprung--Russell Diagram
• The Volume-Complete Sample of M Dwarfs with Masses 0.1 <= M/M_sol <= 0.3 within 15 Parsecs
• A multiple planet system of super-Earths orbiting the brightest red dwarf star GJ887
• 1I/2017 'Oumuamua-like Interstellar Asteroids as Possible Messengers from the Dead Stars
• No evidence for a strong decrease of planetesimal accretion in old white dwarfs
• Asynchronous accretion can mimic diverse white dwarf pollutants I: core and mantle fragments
• Atmospheric parameters and carbon abundance for hot DB white dwarfs
• Evidence of Rocky Planetesimals Orbiting Two Hyades Stars
• Interstellar Meteors are Outliers in Material Strength
• Tidal Wave Breaking in the Eccentric Lead-In to Mass Transfer and Common Envelope Phases
• From Pericenter and Back: Full Debris Stream Evolution in Tidal Disruption Events
• The dynamics of debris streams from tidal disruption events: exact solutions, critical stream density, and hydrogen recombination
• The tilt of the velocity ellipsoid of different Galactic disk populations