2015AJ....149...95S -
Astron. J., 149, 95 (2015/March-0)
Pan-chromatic observations of the remarkable nova Large Magellanic Cloud 2012.
SCHWARZ G.J., SHORE S.N., PAGE K.L., OSBORNE J.P., BEARDMORE A.P., WALTER F.M., BODE M.F., DRAKE J.J., NESS J.-U., STARRFIELD S., VAN ROSSUM D.R. and WOODWARD C.E.
Abstract (from CDS):
We present the results of an intensive multiwavelength campaign on nova LMC 2012. This nova evolved very rapidly in all observed wavelengths. The time to fall two magnitudes in the V band was only 2 days. In X-rays the super soft phase began 13±5 days after discovery and ended around day 50 after discovery. During the super soft phase, the Swift/XRT and Chandra spectra were consistent with the underlying white dwarf (WD) being very hot, : (1 MK, and luminous, : (1038 erg/s. The UV, optical, and near-IR photometry showed a periodic variation after the initial and rapid fading had ended. Timing analysis revealed a consistent 19.24±0.03 hr period in all UV, optical, and near-IR bands with amplitudes of : (0.3 mag which we associate with the orbital period of the central binary. No periods were detected in the corresponding X-ray data sets. A moderately high inclination system, i = 60±10°, was inferred from the early optical emission lines. The HST/STIS UV spectra were highly unusual with only the N v (1240 Å) line present and superposed on a blue continuum. The lack of emission lines and the observed UV and optical continua from four epochs can be fit with a low mass ejection event, : (10–6 M☉, from a hot and massive WD near the Chandrasekhar limit. The WD, in turn, significantly illuminated its subgiant companion which provided the bulk of the observed UV/optical continuum emission at the later dates. The inferred extreme WD characteristics and low mass ejection event favor nova LMC 2012 being a recurrent nova of the U Sco subclass.
Abstract Copyright:
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Journal keyword(s):
novae, cataclysmic variables - ultraviolet: stars
VizieR on-line data:
<Available at CDS (J/AJ/149/95): table2.dat table3.dat>
CDS comments:
V2672 Cyg is a misprint for V2672 Oph.
Simbad objects:
17
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