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Simultaneous Multi-Wavelength Observations of Magnetic Activity in Ultracool Dwarfs. III. X-ray, Radio, and H-alpha Activity Trends in M and L Dwarfs
E. Berger, G. Basri, T. A. Fleming +6
[Abridged] As part of our on-going investigation into the magnetic field properties of ultracool dwarfs, we present simultaneous radio, X-ray, and H-alpha observations of three M9.…
The Runaway White Dwarf LP400-22 Has a Companion
Mukremin Kilic, Warren R. Brown, Carlos Allende Prieto +4
We report the detection of a radial velocity companion to the extremely low mass white dwarf LP400-22. The radial velocity of the white dwarf shows variations with a semi-amplitude…
A Radio Search For Pulsar Companions To SDSS Low-Mass White Dwarfs
Marcel A. Agueros, Fernando Camilo, Nicole M. Silvestri +3
We have conducted a search for pulsar companions to 15 low-mass white dwarfs (LMWDs; M < 0.4 M_Sun) at 820 MHz with the NRAO Green Bank Telescope (GBT). These LMWDs were spectrosco…
Pulsation in carbon-atmosphere white dwarfs: A new chapter in white dwarf asteroseismology
G. Fontaine, P. Brassard, P. Dufour +2
We present some of the results of a survey aimed at exploring the asteroseismological potential of the newly-discovered carbon-atmosphere white dwarfs. We show that, in certains re…
A Progress Report on the Carbon Dominated Atmosphere White Dwarfs
P. Dufour, J. Liebert, B. Swift +2
Recently, Dufour et al. (2007) reported the unexpected discovery that a few white dwarfs found in the Sloan Digital Sky Survey had an atmosphere dominated by carbon with little or…