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Unusual Abundances from Planetary System Material Polluting the White Dwarf G238-44
Ted M Johnson, Beth L. Klein, D. Koester +3
Ultraviolet and optical spectra of the hydrogen-dominated atmosphere white dwarf star G238-44 obtained with FUSE, Keck/HIRES, HST/COS, and HST/STIS reveal ten elements heavier than…
V488 Per revisited: no strong mid-infrared emission features and no evidence for stellar/sub-stellar companions
Swetha Sankar, Carl Melis, Beth L. Klein +4
We present characterization of the planetary system architecture for V488 Per, the dustiest main sequence star known with a fractional infrared luminosity of ~16%. Far-infrared ima…
Recurring Planetary Debris Transits and Circumstellar Gas around White Dwarf ZTF J03281219
Zachary P. Vanderbosch, Saul Rappaport, Joseph A. Guidry +14
We present follow-up photometry and spectroscopy of ZTF J03281219 strengthening its status as a white dwarf exhibiting transiting planetary debris. Using TESS and Zwicky Transie…
Two Beyond-Primitive Extrasolar Planetesimals
S. Xu, M. Jura, B. Klein +2
Using the Cosmic Origins Spectrograph onboard the Hubble Space Telescope, we have obtained high-resolution ultraviolet observations of GD 362 and PG 1225-079, two helium-dominated,…
Rocky Extrasolar Planetary Compositions Derived from Externally-Polluted White Dwarfs
B. Klein, M. Jura, D. Koester +1
We report Keck High Resolution Echelle Spectrometer data and model atmosphere analysis of two helium-dominated white dwarfs, PG1225-079 and HS2253+8023, whose heavy pollutions most…
Strengthening the Case for Asteroidal Accrection: Evidence for Subtle and Diverse Disks at White Dwarfs
J. Farihi, M. Jura, J. -E. Lee +1
Spitzer Space Telescope IRAC 3-8 micron and AKARI IRC 2-4 micron photometry are reported for ten white dwarfs with photospheric heavy elements; nine relatively cool stars with phot…