Six White Dwarfs with Circumstellar Silicates

Abstract

Spitzer Space Telescope spectra reveal 10 micron silicate emission from circumstellar dust orbiting six externally-polluted white dwarfs. Micron-size glasses with an olivine stoichiometry can account for the distinctively broad wings that extend to 12 microns; these particles likely are produced by tidal-disruption of asteroids. The absence of infrared PAH features is consistent with a scenario where extrasolar rocky planets are assembled from carbon-poor solids.

21 pages, 7 figures, AJ, in press

References in corpus (27)

• The Spitzer Space Telescope Mission
• The Infrared Spectrograph on the Spitzer Space Telescope
• A Tidally-Disrupted Asteroid Around the White Dwarf G29-38
• ISO spectroscopy of circumstellar dust in 14 Herbig Ae/Be systems: towards an understanding of dust processing
• The absence of crystalline silicates in the diffuse interstellar medium
• A gaseous metal disk around a white dwarf
• Transience of hot dust around sun-like stars
• The Chemical Composition of an Extrasolar Minor Planet
• Pollution of single white dwarfs by accretion of many small asteroids
• The shape and composition of interstellar silicate grains
• The Dust cloud around the White Dwarf G 29-38
• Externally-polluted white dwarfs with dust disks
• A Dusty Disk Around GD 362, a White Dwarf With a Uniquely High Photospheric Metal Abundance
• Debris Disks Around White Dwarfs: The DAZ Connection
• Carbon Deficiency in Externally-Polluted White Dwarfs: Evidence for Accretion of Asteroids
• The New Class of Dusty DAZ White Dwarfs
• The accretion-diffusion scenario for metals in cool white dwarfs
• Excess Infrared Radiation from a Massive DAZ White Dwarf: GD362 - a Debris Disk?
• SDSSJ104341.53+085558.2: A second white dwarf with a gaseous debris disc
• Spitzer IRAC Observations of White Dwarfs. I. Warm Dust at Metal-Rich Degenerates
• Mid-infrared spectra of PAH emission in Herbig AeBe stars
• Infrared Emission from the Dusty Disk Orbiting GD 362, An Externally-Polluted White Dwarf
• Warm dust in the terrestrial planet zone of a sun-like Pleiad: collisions between planetary embryos?
• Circumstellar Dust Created by Terrestrial Planet Formation in HD 113766
• A Dusty Disk Around WD1150-153: Explaining the Metals in White Dwarfs by Accretion from the Interstellar Medium versus Debris Disks
• Element abundances in cool white dwarfs. II. Ultraviolet observations of DZ white dwarfs
• Radiation induced warping of protostellar accretion disks

Cited by in corpus (80)

• Ancient planetary systems are orbiting a large fraction of white dwarf stars
• Circumstellar Debris and Pollution at White Dwarf Stars
• Chemical Abundances in the Externally Polluted White Dwarf GD 40: Evidence of a Rocky Extrasolar Minor Planet
• Evidence for Water in the Rocky Debris of a Disrupted Extrasolar Minor Planet
• Eccentric Planets and Stellar Evolution as a Cause of Polluted White Dwarfs
• Elemental Compositions of Two Extrasolar Rocky Planetesimals
• Global Models of Runaway Accretion in White Dwarf Debris Disks
• Constraints on the Lifetimes of Disks Resulting from Tidally Destroyed Rocky Planetary Bodies
• The frequency and infrared brightness of circumstellar discs at white dwarfs
• Runaway accretion of metals from compact debris disks onto white dwarfs
• Metal accretion onto white dwarfs caused by Poynting-Robertson drag on their debris disks
• Echoes of a decaying planetary system: the gaseous and dusty disks surrounding three white dwarfs
• Strengthening the Case for Asteroidal Accrection: Evidence for Subtle and Diverse Disks at White Dwarfs
• The Discovery of the Most Metal-Rich White Dwarf: Composition of a Tidally Disrupted Extrasolar Dwarf Planet
• Doppler-imaging of the planetary debris disc at the white dwarf SDSS J122859.93+104032.9
• A Trio of Metal-Rich Dust and Gas Disks Found Orbiting Candidate White Dwarfs with K-Band Excess
• The unbiased frequency of planetary signatures around single and binary white dwarfs using $Spitzer$ and $Hubble$
• Signs of a faint disc population at polluted white dwarfs
• Scars of Intense Accretion Episodes at Metal-Rich White Dwarfs
• Detection limits for close eclipsing and transiting sub-stellar and planetary companions to white dwarfs in the WASP survey
• Possible Signs of Water and Differentiation in a Rocky Exoplanetary Body
• Accretion of a Terrestrial-Like Minor Planet by a White Dwarf
• Inner edges of compact debris disks around metal-rich white dwarfs
• Two Extrasolar Asteroids with Low Volatile-Element Mass Fractions
• Interpretation and diversity of exoplanetary material orbiting white dwarfs
• Rocky Planetesimals as the Origin of Metals in DZ Stars
• Tidal disruption of planetary bodies by white dwarfs I: A hybrid SPH-analytical approach
• Trace hydrogen in helium atmosphere white dwarfs as a possible signature of water accretion
• Evidence for an external origin of heavy elements in hot DA white dwarfs
• A Dusty Component to the Gaseous Debris Disk around the White Dwarf SDSS J1228+1040
• The frequency of gaseous debris discs around white dwarfs
• Tidal disruption of planetary bodies by white dwarfs II: Debris disc structure and ejected interstellar asteroids
• The Magnetic and Metallic Degenerate G77-50
• Infrared observations of white dwarfs and the implications for the accretion of dusty planetary material
• The WIRED Survey. IV. New Dust Disks from the McCook & Sion White Dwarf Catalog
• A search for planetary eclipses of white dwarfs in the Pan-STARRS1 medium-deep fields
• Transient outburst events from tidally disrupted asteroids near white dwarfs
• Detecting bio-markers in habitable-zone earths transiting white dwarfs
• Global modeling of radiatively driven accretion of metals from compact debris disks onto the white dwarfs
• Spitzer Planet Limits around the Pulsating White Dwarf GD66
• White dwarfs with planetary remnants in the era of Gaia I: six emission line systems
• Dust Production and Depletion in Evolved Planetary Systems
• Infrared Excesses around Bright White Dwarfs from Gaia and unWISE I
• Exoplanet recycling in massive white-dwarf debris discs
• The puzzling source IGR J17361-4441 in NGC 6388: a possible planetary tidal disruption event
• Post main sequence evolution of icy minor planets: Implications for water retention and white dwarf pollution
• Another one grinds the dust: Variability of the planetary debris disc at the white dwarf SDSS J104341.53+085558.2
• A dearth of small particles in the transiting material around the white dwarf WD 1145+017
• Dusty WDs in the $WISE$ All Sky Survey $\cap$ SDSS
• Simultaneous infrared and optical observations of the transiting debris cloud around WD 1145+017
• Non-LTE models for the gaseous metal component of circumstellar discs around white dwarfs
• High-eccentricity migration of planetesimals around polluted white dwarfs
• ALMA and Herschel Observations of the Prototype Dusty and Polluted White Dwarf G29-38
• Circumbinary exoplanets and brown dwarfs with the Laser Interferometer Space Antenna
• Post main sequence evolution of icy minor planets II: water retention and white dwarf pollution around massive progenitor stars
• Importance of fingering convection for accreting white dwarfs in the framework of full evolutionary calculations: the case of the hydrogen-rich white dwarfs GD133 and G29-38
• Post-main-sequence evolution of icy minor planets. III. water retention in dwarf planets and exo-moons and implications for white dwarf pollution
• The Geometry of the G29-38 White Dwarf Dust Disk from Radiative Transfer Modeling
• Magnetospherically-trapped dust and a possible model for the unusual transits at WD 1145+017
• The origin of circumstellar features in the spectra of hot DA white dwarfs
• Near-infrared variability in dusty white dwarfs: tracing the accretion of planetary material
• Limits on Unresolved Planetary Companions to White Dwarf Remnants of 14 Intermediate-Mass Stars
• Modeling the Evolution of Silicate/Volatile Accretion Discs around White Dwarfs
• Prospects for detecting exoplanets around double white dwarfs with LISA and Taiji
• IRTF Observations of White Dwarfs with Possible Near-Infrared Excess
• A Search for Asteroids, Moons, and Rings Orbiting White Dwarfs
• Novalike Cataclysmic Variables in the Infrared
• Transiting Disintegrating Planetary Debris around WD 1145+017
• A Young White Dwarf with an Infrared Excess
• Characterizing the Chemistry of Planetary Materials Around White Dwarf Stars
• Circumstellar Disks at White Dwarfs: Observations
• Can tidal evolution lead to close-in planetary bodies around white dwarfs I: Orbital period distribution
• Can tidal evolution lead to close-in planetary bodies around white dwarfs II: volcanism and transits
• Serendipitous discovery of a dusty disc around WDJ181417.84-735459.83
• Infrared and Optical Detectability of Dyson Spheres at White Dwarf Stars
• Precise determination of stellar parameters of the ZZ Ceti and DAZ white dwarf GD 133 through asteroseismology
• Two substellar survivor candidates; one found and one missing
• The Elemental Compositions of Extrasolar Planetesimals
• Diversity of Exoplanets
• Detecting water ice and vapor disks originating from icy planetary bodies around white dwarfs with future PRIMA observations