Journal
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN
Volume 61, Issue 3, Pages 601-613Publisher
OXFORD UNIV PRESS
DOI: 10.1093/pasj/61.3.601
Keywords
accretion, accretion disks; stars: dwarf novae; stars: individual (SDSS J080434.20+510349.2); stars: novae; cataclysmic variables
Categories
Funding
- Global COE Program The Next Generation of Physics, Spun from Universality and Emergence
- Ministry of Education, Culture, Sports, Science and Technology (MEXT) of Japan
- FRSF [NSh-1685.2008.2, RNP-2906, RFBR-08-02-01220, F 25.2/139]
Ask authors/readers for more resources
We observed the 2006 superoutburst of SDSS J080434.20+510349.2 during its plateau phase, rebrightening phase, and post-superoutburst final decline. We found that this object is a grazing eclipsing system with a period of 0.0590048(2)d. Well-defined eclipses were only observed during the late stage of the superoutburst plateau and the depth decreased during the subsequent stages. We determined the superhump period during the superoutburst plateau to be 0.059539(11)d, giving a fractional superhump excess of 0.90(2)%. During the rebrightening and post-superoutburst phases, persisting superhumps have periods longer than those of superhumps during the plateau phase: 0.059632(6)d during the rebrightening phase and 0.05969(4)d during the final fading. This phenomenon is very well in line with the previously known long-period late superhumps in GW Lib, V455 And, and WZ Sge. The amplitudes of orbital humps between different states of rebrightenings suggest that these humps do not arise from the classical hot spot, but are more likely to be a result of projection effect in a high-inclination system. There was no clear evidence for an enhanced hot spot during the rebrightening phase. We also studied previously reported mini-outbursts in the quiescent state, and found evidence that superhumps were transiently excited during these mini-outbursts. The presence of grazing eclipses and distinct multiple rebrightenings in SDSS J080434.20+510349.2 would provide a unique opportunity for understanding the mechanism of rebrightenings in WZ Sge-type dwarf novae.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available