A Tidally-Disrupted Asteroid Around the White Dwarf G29-38

Abstract

The infrared excess around the white dwarf G29-38 can be explained by emission from an opaque flat ring of dust with an inner radius 0.14 of the radius of the Sun and an outer radius approximately equal to the Sun's. This ring lies within the Roche region of the white dwarf where an asteroid could have been tidally destroyed, producing a system reminiscent of Saturn's rings. Accretion onto the white dwarf from this circumstellar dust can explain the observed calcium abundance in the atmosphere of G29-38. Either as a bombardment by a series of asteroids or because of one large disruption, the total amount of matter accreted onto the white dwarf may have been comparable to the total mass of asteroids in the Solar System, or, equivalently, about 1% of the mass in the asteroid belt around the main sequence star zeta Lep.

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• Extrasolar enigmas: from disintegrating exoplanets to exoasteroids
• Three-body Mean Motion Resonance Chains as a Delivery Mechanism for White Dwarf Pollution
• Detection and Preliminary Characterisation of Polluted White Dwarfs from Gaia EDR3 and LAMOST
• Detection limits for close eclipsing and transiting sub-stellar and planetary companions to white dwarfs in the WASP survey
• The unreasonable effectiveness of the $n\Sigma v$ approximation
• Detecting water ice and vapor disks originating from icy planetary bodies around white dwarfs with future PRIMA observations
• Formation, diffusion and accreting pollution of DB white dwarfs
• Atmospheric Signatures of Common Envelope Evolution in White Dwarf Planets
• Planets or asteroids? A geochemical method to constrain the masses of White Dwarf pollutants
• I Can Do It With A Broken Planetesimal: Characterising the planetary debris in heavily polluted cool white dwarfs
• Observational Signatures of Planetary Tidal Disruption Events Around Solar-Mass Stars
• Modeling Circumstellar Gas Emission around a White Dwarf Using Cloudy