SIMBAD references

2009ApJ...694..805F - Astrophys. J., 694, 805-819 (2009/April-1)

Infrared signatures of disrupted minor planets at white dwarfs.


Abstract (from CDS):

Spitzer Space Observatory IRAC and MIPS photometric observations are presented for 20 white dwarfs with Teff≲ 20, 000 K and metal-contaminated photospheres. A warm circumstellar disk is detected at GD 16 and likely at PG 1457-086, while the remaining targets fail to reveal mid-infrared excess typical of dust disks, including a number of heavily polluted stars. Extending previous studies, over 50% of all single white dwarfs with implied metal-accretion rates dM/dt≳ 3x108 g/s display a warm infrared excess from orbiting dust; the likely result of a tidally destroyed minor planet. This benchmark accretion rate lies between the dust production rates of 106 g/s in the solar system zodiacal cloud and 1010 g/s often inferred for debris disks at main-sequence A-type stars. It is estimated that between 1% and 3% of all single white dwarfs with cooling ages less than around 0.5 Gyr possess circumstellar dust, signifying an underlying population of minor planets.

Abstract Copyright:

Journal keyword(s): circumstellar matter - infrared: stars - minor planets, asteroids - planetary systems - stars: abundances - stars: evolution - stars: individual (GD 16, PG1457-086) - stars: low-mass, brown dwarfs - white dwarfs

Simbad objects: 61

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