PAN-CHROMATIC OBSERVATIONS of the RECURRENT NOVA LMC 2009a (LMC 1971b)

M. F. Bode, M. J. Darnley, A. P. Beardmore, J. P. Osborne, K. L. Page, F. M. Walter, J. Krautter, A. Melandri, J. U. Ness, T. J. O'Brien, M. Orio, G. J. Schwarz, M. M. Shara, Sumner Starrfield

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Abstract

Nova LMC 2009a is confirmed as a recurrent nova (RN) from positional coincidence with nova LMC 1971b. The observational data set is one of the most comprehensive for any Galactic or extragalactic RN: optical and near-IR photometry from outburst until over 6 years later; optical spectra for the first 6 months, and Swift satellite ultraviolet (UV) and X-ray observations from 9 days to almost 1 year post-outburst. We find MV = -8.4 ±0.8r ±0.7s and expansion velocities between 1000 and 4000 km s-1. Coronal line emission before day 9 indicates shocks in the ejecta. Strengthening of He IIλ4686 preceded the emergence of the super-soft source (SSS) in X-rays at ∼63-70 days, which was initially very variable. Periodic modulations, P = 1.2 days, most probably orbital in nature, were evident in the UV and optical from day 43. Subsequently, the SSS shows an oscillation with the same period but with a delay of 0.28P. The progenitor system has been identified; the secondary is most likely a sub-giant feeding a luminous accretion disk. Properties of the SSS infer a white dwarf (WD) mass 1.1 M ≲ MWD ≲ 1.3 M. If the accretion occurs at a constant rate, Macc ≃ 3.6+4.7 -2.5 ×10-7 M yr-1 is needed, consistent with nova models for an inter-eruption interval of 38 years, low outburst amplitude, progenitor position in the color-magnitude diagram, and spectral energy distribution at quiescence. We note striking similarities between LMC 2009a and the Galactic nova KT Eri, suggesting that KT Eri is a candidate RN.

Original languageEnglish (US)
Article number145
JournalAstrophysical Journal
Volume818
Issue number2
DOIs
StatePublished - Feb 20 2016

Fingerprint

polyacrylonitrile
outburst
accretion
color-magnitude diagram
ejecta
spectral energy distribution
accretion disks
volcanic eruptions
photometry
optical spectrum
x rays
volcanic eruption
diagram
shock
oscillation
intervals
modulation
orbitals
oscillations
expansion

Keywords

  • galaxies: individual (LMC)
  • novae, cataclysmic variables
  • stars: individual (Nova LMC 2009a, Nova LMC 1971b)
  • white dwarfs

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Bode, M. F., Darnley, M. J., Beardmore, A. P., Osborne, J. P., Page, K. L., Walter, F. M., ... Starrfield, S. (2016). PAN-CHROMATIC OBSERVATIONS of the RECURRENT NOVA LMC 2009a (LMC 1971b). Astrophysical Journal, 818(2), [145]. https://doi.org/10.3847/0004-637X/818/2/145

PAN-CHROMATIC OBSERVATIONS of the RECURRENT NOVA LMC 2009a (LMC 1971b). / Bode, M. F.; Darnley, M. J.; Beardmore, A. P.; Osborne, J. P.; Page, K. L.; Walter, F. M.; Krautter, J.; Melandri, A.; Ness, J. U.; O'Brien, T. J.; Orio, M.; Schwarz, G. J.; Shara, M. M.; Starrfield, Sumner.

In: Astrophysical Journal, Vol. 818, No. 2, 145, 20.02.2016.

Research output: Contribution to journalArticle

Bode, MF, Darnley, MJ, Beardmore, AP, Osborne, JP, Page, KL, Walter, FM, Krautter, J, Melandri, A, Ness, JU, O'Brien, TJ, Orio, M, Schwarz, GJ, Shara, MM & Starrfield, S 2016, 'PAN-CHROMATIC OBSERVATIONS of the RECURRENT NOVA LMC 2009a (LMC 1971b)', Astrophysical Journal, vol. 818, no. 2, 145. https://doi.org/10.3847/0004-637X/818/2/145
Bode MF, Darnley MJ, Beardmore AP, Osborne JP, Page KL, Walter FM et al. PAN-CHROMATIC OBSERVATIONS of the RECURRENT NOVA LMC 2009a (LMC 1971b). Astrophysical Journal. 2016 Feb 20;818(2). 145. https://doi.org/10.3847/0004-637X/818/2/145
Bode, M. F. ; Darnley, M. J. ; Beardmore, A. P. ; Osborne, J. P. ; Page, K. L. ; Walter, F. M. ; Krautter, J. ; Melandri, A. ; Ness, J. U. ; O'Brien, T. J. ; Orio, M. ; Schwarz, G. J. ; Shara, M. M. ; Starrfield, Sumner. / PAN-CHROMATIC OBSERVATIONS of the RECURRENT NOVA LMC 2009a (LMC 1971b). In: Astrophysical Journal. 2016 ; Vol. 818, No. 2.
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AU - Walter, F. M.

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KW - stars: individual (Nova LMC 2009a, Nova LMC 1971b)

KW - white dwarfs

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