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We examine four high resolution reflection grating spectrometers (RGS)spectra of the February 2009 outburst of the luminous recurrent nova LMC 2009a.They were very complex and rich in intricate absorption and emission features.The continuum was consistent with a dominant component originating in theatmosphere of a shell burning white dwarf (WD) with peak effective temperaturebetween 810,000 K and a million K, and mass in the 1.2-1.4 M$_\odot$ range. Amoderate blue shift of the absorption features of a few hundred km s$^{-1}$ canbe explained with a residual nova wind depleting the WD surface at a rate ofabout 10$^{-8}$ M$_\odot$ yr$^{-1}$. The emission spectrum seems to be due toboth photoionization and shock ionization in the ejecta. The supersoft X-rayflux was irregularly variable on time scales of hours, with decreasingamplitude of the variability. We find that both the period and the amplitude ofanother, already known 33.3 s modulation, varied within timescales of hours. Wecompared N LMC 2009a with other Magellanic Clouds novae, including 4serendipitously discovered as supersoft X-ray sources (SSS) among 13 observedwithin 16 years after the eruption. The new detected targets were much lessluminous than expected: we suggest that they were partially obscured by theaccretion disk. Lack of SSS detections in the Magellanic Clouds novae more than5.5 years after the eruption constrains the average duration of the nuclearburning phase.

Nova LMC 2009a as observed with XMM-Newton, compared with other novae