2010ApJ...720L..52V

We report a discovery of the circularly polarized CH A ²Δ-X ²Π and B ²Σ^–-X ²Π molecular bands in the spectrum of the DQ white dwarf (WD) GJ 841B. This is only the second such object since the discovery of G99-37 in the 1970s. GJ 841B is also the first WD to unambiguously show polarization in the C₂ Swan bands. By modeling the intensity and circular polarization in the CH bands, we determine the longitudinal magnetic field strength of 1.3±0.5 MG and the temperature of 6100±200 K in the absorbing region. We also present new observations of G99-37 and obtain estimates of the magnetic field strength 7.3±0.3 MG and temperature 6200±200 K, in good agreement with previous results.