Multi-epoch time-resolved photometry of the eclipsing polar CSS081231:071126+440405
Abstract
The eclipsing polar CSS081231:071126+440405 turned bright (V_max∼ 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°-83.7°. 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.
- Publication:
-
Astronomische Nachrichten
- Pub Date:
- February 2015
- DOI:
- 10.1002/asna.201412151
- arXiv:
- arXiv:1501.05217
- Bibcode:
- 2015AN....336..115S
- Keywords:
-
- binaries: eclipsing;
- novae;
- cataclysmic variables;
- stars: individual (CSS081231:071126+440405);
- techniques: photometric;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 11 pages, 11 figures, accepted for publication in AN