11 papers
Consistent Multi-Wavelength Spectral Modeling of Cool White Dwarfs with Carbon-Polluted Atmospheres
Jay Farihi, Piotr M. Kowalski, Sandy K. Leggett +3
This work presents atmospheric modeling of multi-wavelength spectra for eight cool white dwarfs with carbon-enriched atmospheres, with four each of spectral type DQ and DQp. The De…
An eclipsing CEMP candidate discovered in a search for dwarf carbon stars in post-common envelope binaries
Jonathan A. G. McLennan, Jay Farihi, Steven G. Parsons
Dwarf carbon stars are dominated by members of the Galactic halo and are thus likely carbon-enhanced metal-poor stars. In this work, 879 bona fide dwarf carbon stars are characteri…
Accretion Rate Changes Detected in a Polluted White Dwarf
Jay Farihi, Hiba Tu Noor, Carl Melis +6
This letter reports statistically significant changes in the equivalent widths of MgII and CaII lines in the dusty and polluted white dwarf WD 0106-328, based on six epochs of spec…
The MIRI Excesses around Degenerates (MEAD) Survey I: A candidate cold brown dwarf in orbit around the nearby white dwarf 2MASS J09424023-4637176
Loïc Albert, Sabrina R. Poulsen, Ãrika Le Bourdais +17
The MIRI Excesses Around Degenerates Survey is a Cycle 2 James Webb Space Telescope (JWST) Survey program designed to image nearby white dwarfs in the mid-IR with the MIRI imaging…
Discovery of an icy and nitrogen-rich extrasolar planetesimal
Snehalata Sahu, Boris T. Gänsicke, Jamie T. Williams +7
White dwarfs accreting planetary debris provide detailed insight into the bulk composition of rocky exo-planetesimals. However, only one Kuiper-Belt analogue has been identified in…
Carbon-Enhanced Dwarf Stars Are Predominantly a Halo Population
Jay Farihi, Jason L. Sanders, Sophia Lilleengen +2
This paper reports a Galactic kinematical and dynamical analysis of 1003 main-sequence carbon stars. The sample is drawn from the Sloan Digital Sky Survey, and cross-matched with G…