Multiwavelength observations of nova SMCN 2016-10a - one of the brightest novae ever observed

E. Aydi, K. L. Page, N. P.M. Kuin, M. J. Darnley, F. M. Walter, P. Mróz, D. A.H. Buckley, S. Mohamed, P. Whitelock, P. Woudt, S. C. Williams, M. Orio, R. E. Williams, A. P. Beardmore, J. P. Osborne, A. Kniazev, V. A.R.M. Ribeiro, A. Udalski, J. Strader, L. Chomiuk

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Abstract

We report on multiwavelength observations of nova Small Magellanic Cloud Nova 2016-10a. The present observational set is one of the most comprehensive for any nova in the Small Magellanic Cloud, including low-, medium-, and high-resolution optical spectroscopy and spectropolarimetry from Southern African Large Telescope, Folded Low-Order Yte-Pupil Double-Dispersed Spectrograph, and Southern Astrophysical Research; long-term Optical Gravitational Lensing Experiment V- and I-bands photometry dating back to 6 yr before eruption; Small and Moderate Aperture Research Telescope System optical and near-IR photometry from ~11 d until over 280 d post-eruption; Swift satellite X-ray and ultraviolet observations from ~6 d until 319 d post-eruption. The progenitor system contains a bright disc and a main sequence or a sub-giant secondary. The nova is very fast with t2 ≃ 4.0 ± 1.0 d and t3 ≃ 7.8 ± 2.0 d in the V band. If the nova is in the SMC, at a distance of ~61 ± 10 kpc, we derive MV, max ≃-10.5 ± 0.5, making it the brightest nova ever discovered in the SMC and one of the brightest on record. At day 5 post-eruption the spectral lines show a He/N spectroscopic class and an Full Width at Half Maximum of ~3500 km s-1, indicating moderately high ejection velocities. The nova entered the nebular phase ~20 d post-eruption, predicting the imminent super-soft source turn-on in the X-rays, which started ~28 d post-eruption. The super-soft source properties indicate a white dwarf mass between 1.2 and 1.3M in good agreement with the optical conclusions.

Original languageEnglish
Pages (from-to)2679-2705
Number of pages27
JournalMonthly Notices of the Royal Astronomical Society
Volume474
Issue number2
Publication statusPublished - 2018

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Aydi, E., Page, K. L., Kuin, N. P. M., Darnley, M. J., Walter, F. M., Mróz, P., Buckley, D. A. H., Mohamed, S., Whitelock, P., Woudt, P., Williams, S. C., Orio, M., Williams, R. E., Beardmore, A. P., Osborne, J. P., Kniazev, A., Ribeiro, V. A. R. M., Udalski, A., Strader, J., & Chomiuk, L. (2018). Multiwavelength observations of nova SMCN 2016-10a - one of the brightest novae ever observed. Monthly Notices of the Royal Astronomical Society, 474(2), 2679-2705.