Multi-epoch time-resolved photometry of the eclipsing polar CSS081231:071126+440405

作者：Schwope A D^*; Mackebrandt F; Thinius B D; Littlefield C; Garnavich P; Oksanen A; Granzer T

来源：Astronomische Nachrichten, 2015, 336(2): 115-124.

DOI：10.1002/asna.201412151

• binaries: eclipsing
• novae
• cataclysmic variables
• stars: individual (CSS081231:071126+440405)
• techniques: photometric

The eclipsing polar CSS081231:071126+440405 turned bright (V-max approximate to 14.5) in late 2008 and was subsequently observed intensively with small and medium-sized telescopes. A homogeneous analysis of this comprehensive dataset comprising 109 eclipse epochs is presented and a linear ephemeris covering the five years of observations, about 24000 orbital cycles, is derived. Formally this sets rather tight constraints on the mass of a hypothetical circumbinary planet, M-pl 2 M-Jup. This preliminary result needs consolidation by long-term monitoring of the source. The eclipse lasts 433.08 +/- 0.65 s, and the orbital inclination is found to be i = 79.3 degrees-83.7 degrees. The centre of the bright phase displays accretion-rate dependent azimuthal shifts. No accretion geometry is found that explains all observational constraints, suggesting a complex accretion geometry with possible pole switches and a likely non-dipolar field geometry.

• 出版日期2015-3