SDSS J141118.31+481257.6 is an ultracompact white dwarf binary (or AM CVn sys- tem) with an orbital period of 46 min. We analyze ∼ 23 ks of X-ray and UV data taken with the Neil Gehrels Swift Observatory during its first ever recorded outbursts. The events took place 13 years after the system was discovered. We detected 3 events in our UV data, all with amplitudes of ∼ 7 mags with respect to quiescence, the largests detected for an AM CVn system so far. The first 2 events correspond to a superout- burst and the third one to another detected outburst. The 3 episodes that we identified occurred in a period of 24 days, each one displaying very rapid brightness changes. At ∼ 120 days since the detection of the superoutburst, the system remains 1 magnitude brighter in UV compared to the quiescence level. The X-ray observations suggest that the X-ray emission is not correlated with the UV.
|State||Published - Sep 26 2018|
- Binaries: Close
- Stars: Individual: SDSS J141118.31+481257.6
- Ultraviolet: Stars
- White dwarf: Stars
- X-rays: Binaries