Rocky Planetesimals as the Origin of Metals in DZ Stars

Abstract

{Abridged}. An analysis of the calcium and hydrogen abundances, Galactic positions and kinematics of 146 DZ stars from the Sloan Digital Sky Survey demonstrates that interaction with the interstellar medium cannot account for their externally polluted atmospheres. The calcium-to-hydrogen ratios for the 37 DZA stars are dominated by super-solar values, as are the lower limits for the remaining 109 DZ stars. All together their metal-contaminated convective envelopes contain 10^{20+-2} g of calcium, commensurate with the masses of calcium inferred for large asteroids. It is probable that these stars are contaminated by circumstellar matter; the rocky remains of terrestrial planetary systems. In this picture, two predictions emerge: 1) at least 3.5% of all main sequence A- and F-type stars build terrestrial planets; and 2) the DZA stars are externally polluted by both metals and hydrogen, and hence constrain the frequency and mass of water-rich, extrasolar planetesimals.

Accepted to MNRAS

References in corpus (15)

• The Seventh Data Release of the Sloan Digital Sky Survey
• The Structure of the Local Interstellar Medium V: Electron Densities
• Infrared Signatures of Disrupted Minor Planets at White Dwarfs
• The Chemical Composition of an Extrasolar Minor Planet
• White Dwarf Mass Distribution in the SDSS
• Accretion and diffusion in white dwarfs. New diffusion timescales and applications to GD362 and G29-38
• On the Spectral Evolution of Cool, Helium-Atmosphere White Dwarfs: Detailed Spectroscopic and Photometric Analysis of DZ Stars
• Six White Dwarfs with Circumstellar Silicates
• The accretion-diffusion scenario for metals in cool white dwarfs
• SDSSJ084539.17+225728.0: the first DBZ white dwarf with a metal-rich gaseous debris disc
• X-ray and Infrared Observations of Two Externally-Polluted White Dwarfs
• Hot DB White Dwarfs from the Sloan Digital Sky Survey
• A Dusty Disk Around WD1150-153: Explaining the Metals in White Dwarfs by Accretion from the Interstellar Medium versus Debris Disks
• Model Atmosphere Analysis of the Weakly Magnetic DZ White Dwarf G165-7
• Do weak magnetic fields prevent hydrogen from accreting onto metal-line white dwarf stars?

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• A New Generation of Cool White Dwarf Atmosphere Models. IV. Revisiting the Spectral Evolution of Cool White Dwarfs
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• Bayesian constraints on the origin and geology of exo-planetary material using a population of externally polluted white dwarfs
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• On the Spectral Evolution of Hot White Dwarf Stars. II. Time-dependent Simulations of Element Transport in Evolving White Dwarfs with STELUM
• 1I/2017 'Oumuamua-like Interstellar Asteroids as Possible Messengers from the Dead Stars
• Polluting White Dwarfs with Perturbed Exo-Comets
• The habitability and detection of Earth-like planets orbiting cool white dwarfs
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• Spectral analysis of ultra-cool white dwarfs polluted by planetary debris
• The lifetimes of planetary debris discs around white dwarfs
• Tidal circularization of gaseous planets orbiting white dwarfs
• The spectral evolution of white dwarfs: where do we stand?
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• Understanding the origin of white dwarf atmospheric pollution by dynamical simulations based on detected three-planet systems
• SDSS J074511.56+194926.5: Discovery of a Metal-Rich and Tidally Distorted Extremely Low Mass White Dwarf
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• Investigation of the asteroid-neutron star collision model for the repeating fast radio bursts
• A New Generation of Cool White Dwarf Atmosphere Models. III. WD J2356$-$209: Accretion of a Planetesimal with an Unusual Composition
• Asynchronous accretion can mimic diverse white dwarf pollutants I: core and mantle fragments
• Lambda Boo Abundance Patterns: Accretion from Orbiting Sources
• Computational Tools for the Spectroscopic Analysis of White Dwarfs
• Dynamical evolution of two-planet systems and its connection with white dwarf atmospheric pollution
• Survivability of radio-loud planetary cores orbiting white dwarfs
• Near-infrared variability in dusty white dwarfs: tracing the accretion of planetary material
• On the role of resonances in polluting white dwarfs by asteroids
• Necroplanetology: Simulating the Tidal Disruption of Differentiated Planetary Material Orbiting WD 1145+017
• Modeling the Evolution of Silicate/Volatile Accretion Discs around White Dwarfs
• Evidence for post-nebula volatilisation in an exo-planetary body
• White dwarf planetary debris dependence on physical structure distributions within asteroid belts
• Broadening of Ly alpha by neutral helium in DBA white dwarfs
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