19 citations · 46 across the 5 of their papers we have counts for
5 papers · 1 filter
Discovery of Dipolar Chromospheres in Two White Dwarfs
J. Farihi, J. J. Hermes, S. P. Littlefair +3
This paper reports the ULTRACAM discovery of dipolar surface spots in two cool magnetic white dwarfs with Balmer emission lines, while a third system exhibits a single spot, simila…
Measurement of stellar and substellar winds using white dwarf hosts
N. Walters, J. Farihi, P. Dufour +2
White dwarfs stars are known to be polluted by their active planetary systems, but little attention has been paid to the accretion of wind from low-mass companions. The capture of…
Two substellar survivor candidates; one found and one missing
N. Walters, J. Farihi, T. R. Marsh +4
This study presents observations of two possible substellar survivors of post-main sequence engulfment, currently orbiting white dwarf stars. Infrared and optical spectroscopy of G…
Carbon-enhanced stars with short orbital and spin periods
L. J. Whitehouse, J. Farihi, I. D. Howarth +5
Many characteristics of dwarf carbon stars are broadly consistent with a binary origin, including mass transfer from an evolved companion. While the population overall appears to h…
A test of the planet-star unipolar inductor for magnetic white dwarfs
N. Walters, J. Farihi, T. R. Marsh +7
Despite thousands of spectroscopic detections, only four isolated white dwarfs exhibit Balmer emission lines. The temperature inversion mechanism is a puzzle over 30 years old that…