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Six White Dwarfs with Circumstellar Silicates
M. Jura, J. Farihi, B. Zuckerman
Spitzer Space Telescope spectra reveal 10 micron silicate emission from circumstellar dust orbiting six externally-polluted white dwarfs. Micron-size glasses with an olivine stoich…
Pollution of single white dwarfs by accretion of many small asteroids
M. Jura
Extrapolating from the solar system's asteroid belt, we propose that externally-contaminated white dwarfs without an infrared excess may be experiencing continuous accretion of gas…
Near-Infrared Variability in the 2MASS Calibration Fields: A Search for Planetary Transit Candidates
Peter Plavchan, M. Jura, J. Davy Kirkpatrick +2
The 2MASS photometric calibration observations cover ~6 square degrees on the sky in 35 "calibration fields" each sampled in nominal photometric conditions between 562 and 3692 tim…
Externally-polluted white dwarfs with dust disks
M. Jura, J. Farihi, B. Zuckerman
We report Spitzer Space Telescope photometry of eleven externally-polluted white dwarfs. Of the nine stars for which we have IRAC photometry, we find that GD 40, GD 133 and PG 1015…
Infrared Emission from the Dusty Disk Orbiting GD 362, An Externally-Polluted White Dwarf
M. Jura, J. Farihi, B. Zuckerman +2
We report Spitzer Space Telescope photometry between 3.6 microns and 24 microns and spectroscopy between 5 microns and 15 microns of GD 362, a white dwarf with an effective tempera…
Carbon Deficiency in Externally-Polluted White Dwarfs: Evidence for Accretion of Asteroids
M. Jura
Existing determinations show that n(C)/n(Fe) is more than a factor of 10 below solar in the atmospheres of three white dwarfs that appear to be externally-polluted. These results a…