srodney added new fig, updated text. * New figure plots Amplitude (and Lpk) vs recurrence time * updated the abstract to remove the red text * various updates in the classification and discussion sections  almost 8 years ago

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we have observed two distinct outbursts from a single extraordinary  recurrent nova. This model would imply that the \spock system has the  fastest known recurrence timescale of any nova (3 to 5 months).  Further, Furthermore,  if our estimate for the gravitational lensing magnification is correct, then \spock is about 2 orders of magnitude more luminous than an average nova. This model would therefore require then suggests  that the \spock system's primary star is a white dwarf very close to the  Chandrasekhar mass limit, and that it is drawing mass from the  secondary star at an extremely efficient rate \todo{(??? $>10^{-8}$  \Msun/yr ???).} This in turn suggests that this system is a strong  candidate to eventually explode as ($>10^{-7}$ \Msun  yr$^{-1}$), making it  a plausible  Type Ia Supernova. Supernova progenitor  candidate. We conclude with suggestions for lens modeling and  observational tests that could help to clarify the nature of this  unusual transient.  \end{abstract}             

transient episodes that could match the \spock light curve shapes.  We can also rule out active galactic nuclei (AGN), in which brief  transient episodes (a few days in duration) may be observed from X-ray to infrared wavelengths. wavelengths \citep[e.g.][]{Gaskell:2003}.  The AGN hypothesis for \spock is disfavored for three primary reasons: %principally due to the quiescence of the  %\spock sources between the two observed episodes.  First, AGN that exhibit short-duration transient events also typically         

\section{Discussion}  \label{sec:Discussion}  \todo{  the models that come closest to matching the observed characteristics  of the two \spock events are the kilonova model and the recurrent nova  model}  If we accept for the moment that the source of the \spock transient  events is a physically extreme nova system, then we find a significant  problem with the nova The most luminous novae observed in the local  universe were all somewhat slower in their decline rate.           

\label{fig:RecurrentNovaRecurrenceComparison}  Comparison of the inferred \spock recurrence timescale against  observed RNe and models. In the left panel the outburst amplitude in  magnitudes is plotted against the recurrence timescale, while in the  right panel the y axis shows the peak luminosity (or absolute  magnitude). In both panels the joint constraints on \spock from both  transient episodes are plotted as large open diamonds, observed  constraints from the 10 galactic RNe appear as black 'x' points, and  the rapid-recurrence nova M31N 2008a-12 is shown with a thick black  '+' marker. Colored circles show the results from a suite of  numerical hydrodynamic simulations from \citep{Yaron:2005}. The size  of each circle indicates the mass of the primary white dwarf (WD) star  over the range 0.4-1.4 M$_\odot$, as indicated in the legend of the  left panel. The color of each circle denotes the rate of mass  transfer from the secondary onto the WD, as given in the right panel's  legend.           

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figures/peakluminosity_vs_declinetime_wide/peakluminosity_vs_declinetime_wide.png  figures/peakluminosity_vs_declinetime/peakluminosity_vs_declinetime.png  figures/spock_predictions/spock_predictions.png  Classification.tex  figures/recurrent_nova_lightcurve_comparison/recurrent_nova_lightcurve_comparison.png  Classification.tex  figures/recurrent_nova_recurrence_comparison/recurrent_nova_recurrence_comparison.png  Discussion.tex  Acknowledgments.tex