Evans, A ORCID: https://orcid.org/0000-0002-3142-8953, AYdi, E, Sokolovsky, K, Bright, JS, Tremou, E, Nyamai, MM, Strader, J, Chomiuk, L, Myers, G, Hambsch, F-J, Page, K, Buckley, D, Woodward, C, Walter, F, Mroz, P, Vallely, PJ, Geballe, T, Banerjee, D, Gehrz, RD, Fender, R, Gromadzki, M, Kawash, A, Knigge, C, Mukai, K, Munari, U, Orio, M, Ribeiro, V, Sokoloski, JL, Starrfield, S, Udalski, A and Woudt, P (2022) THE 2019 OUTBURST OF THE 2005 CLASSICAL NOVA V1047 CEN: A RECORD BREAKING DWARF NOVA OUTBURST OR A NEW PHENOMENON? Astrophysical Journal. (In Press)

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Abstract

We present a detailed study of the 2019 outburst of the cataclysmic variable V1047 Cen, which hosted a classical nova eruption in 2005. The peculiar outburst occurred 14 years after the classical nova event and lasted for more than 400 days, reaching an amplitude of around 6 magnitudes in the optical. Early spectral follow-up revealed what could be a dwarf nova (accretion disk instability) outburst. However, the outburst duration, high velocity (>2000 km s−1 ) features in the optical line profiles, luminous optical emission, and presence of prominent long-lasting radio emission together suggest a phenomenon more exotic and energetic than a dwarf nova outburst. The outburst amplitude, radiated energy, and spectral evolution are also not consistent with a classical nova eruption. There are similarities between V1047 Cen’s 2019 outburst and those of classical symbiotic stars, but pre-2005 images of the field of V1047 Cen indicate that the system likely hosts a dwarf companion, implying a typical cataclysmic variable system. Based on our multi-wavelength observations, we suggest that the outburst may have started with a brightening of the disk due to enhanced mass transfer or disk instability, possibly leading to enhanced nuclear shell burning on the white dwarf, which was already experiencing some level of quasi-steady shell burning. This eventually led to the generation of a wind and/or bipolar, collimated outflows. The 2019 outburst of V1047 Cen appears to be unique, and nothing similar has been observed in a typical cataclysmic variable system before, hinting at a potentially new astrophysical phenomenon.

Item Type: Article
Additional Information: The final version of this article and all relevant information related to it, including copyrights, can be found on the publisher website.
Subjects: Q Science > Q Science (General)
Q Science > QB Astronomy
Q Science > QB Astronomy > QB460 Astrophysics
Q Science > QB Astronomy > QB600 Planets. Planetology
Q Science > QC Physics
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Depositing User: Symplectic
Date Deposited: 15 Sep 2022 09:32
Last Modified: 15 Sep 2022 09:37
URI: https://eprints.keele.ac.uk/id/eprint/11413

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