English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We have monitored the 2014 superoutburst of the WZ Sge-type transient PNVJ03093063+2638031 for more than four months, from V=11.0 maximum brightnessdown to V=18.4 mag, close to quiescence value, by obtaining BVRI photometry andlow resolution fluxed spectroscopy. The evolution was normal and no late-time`echo' outbursts were observed. The absolute integrated flux of emission lineskept declining along the superoutburst, and their increasing contrast with theunderlying continuum was simply the result of the faster decline of thecontinuum compared to the emission lines. Inspection of historical Harvardplates covering the 1899-1981 period did not reveal previous outbursts, neither`normal' nor 'super'. We discovered an extended emission nebula (radius ~1arcmin) around PNV J03093063+2638031, that became visible for a few months asthe result of photo-ionization from the superoutburst of the central star. Itis not present on Palomar I and II sky survey images and it quickly disappearedwhen the outburst was over. From the rate at wich the inization front sweptthrough the nebula, we derive a distance of ~120 pc to the system. The nebulais density bounded with an outer radius of 0.03 pc, and the absolute magnitudeof the central star in quiescence is M(V)~14.2 mag. The electron density in thenebula is estimated to be 10(+5) cm(-3) from the observed recombination timescale. Given the considerable substructures seen across the nebula, a lowfilling factor is inferred. Similar nebulae have not been reported for other WZSge objects and the challenges posed to models are considered.

Outburst evolution, historic light curve and a flash-ionized nebula around the WZ Sge-type object PNV J03093063+2638031