Rebrightening Phenomenon in Classical Novae

Details Rebrightening Phenomenon in Classical Novae Rebrightening Phenomenon in Classical Novae

2009-04-15

arxiv.org/abs/0904.2228v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

6 pages, 4 figures, to appear in Variable Star Bulletin

Scientific paper

Two classical novae V1493 Aql and V2362 Cyg were known to exhibit unprecedented large-amplitude rebrightening during the late stage of their evolution. We analyzed common properties in these two light curves. We show that these unusual light curves are very well expressed by a combination of power-law decline, omnipresent in fast novae, and exponential brightening. We propose a schematic interpretation of the properties common to these rebrightenings can be a consequence of a shock resulting from a secondary ejection and its breakout in the optically thick nova winds. This interpretation has an advantage in explaining the rapid fading following the rebrightening and the subsequent evolution of the light curve. The exponential rise might reflect emerging light from the shock front, analogous to a radiative precursor in a supernova shock breakout. The consequence of such a shock in the nova wind potentially explains many kinds of unusual phenomena in novae including early-stage variations and potentially dust formation.

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