Nova LMC 2009 and other Magellanic Clouds Novae: increasing diversity in the nova X-ray research
Abstract
Nova LMC 2009a had an outburst in February of 2009 and was recognized as coincident with Nova LMC 197b, hence it is a recurrent nova. Bode et al. (2016, ApJ, 818, 145) noticed similarities with the Galactic nova KT Eri. These authors suggested that the secondary is an evolved star, with a likely orbital period of 1.2 days, and that the white dwarf is massive, above 1.1. M(sol). We followed the nova with XMM-Newton with four RGS grating exposures, revealing differences from KT Eri and from another well studied recurrent nova with a subgiant, U Sco. On day 90 the spectrum was dominated by emission lines, with a low level of continuum originating from the central source. On days 165 and 197 a luminous supersoft X-ray source emerged, with deep absorption features of nitrogen and oxygen, while several emission lines remained prominent. The central source appeared to have cooled on day 230. Ness et al. (2015, A&A, 578, 39) discovered a modulation with a 33 s period for part of the XMM-Newton exposures' time; here we explore spectral and flux variability on different timescales. Finally, we show serendipitous archival X-ray light curves of other recent novae in the Magellanic Clouds.
- Publication:
-
The X-ray Universe 2017
- Pub Date:
- October 2017
- Bibcode:
- 2017xru..conf..165O