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Infrared spectroscopy of the recent outburst in V1047 Cen (Nova Centauri 2005)

Infrared spectroscopy of the recent outburst in V1047 Cen (Nova Centauri 2005) Thumbnail


Abstract

Fourteen years after its eruption as a classical nova (CN), V1047 Cen (Nova Cen 2005) began an unusual re-brightening in 2019 April. The amplitude of the brightening suggests that this is a dwarf nova (DN) eruption in a CN system. Very few CNe have had DN eruptions within decades of the main CN outburst. The 14 years separating the CN and DN eruptions of V1047 Cen is the shortest of all instances recorded thus far. Explaining this rapid succession of CN and DN outbursts in V1047 Cen may be challenging within the framework of standard theories for DN outbursts. Following a CN eruption, the mass accretion rate is believed to remain high $(\dot{M}\sim10^{-8}$M$_\odot$yr$^{-1})$ for a few centuries, due to the irradiation of the secondary star by the still-hot surface of the white dwarf. Thus a DN eruption is not expected to occur during this high mass accretion phase as DN outbursts, which result from thermal instabilities in the accretion disk, and arise during a regime of low mass accretion rate $(\dot{M}\sim10^{-10}$M$_\odot$yr$^{-1})$. Here we present near-infrared spectroscopy to show that the present outburst is most likely a DN eruption, and discuss the possible reasons for its early occurrence. Even if the present re-brightening is later shown to be due to a cause other than a DN outburst, the present study provides invaluable documentation of this unusual event.

Citation

(2019). Infrared spectroscopy of the recent outburst in V1047 Cen (Nova Centauri 2005). Astrophysical Journal Letters, 886, Article L14. https://doi.org/10.3847/2041-8213/ab5310

Journal Article Type Article
Acceptance Date Oct 28, 2019
Publication Date Nov 15, 2019
Journal Astrophysical Journal Letters
Print ISSN 2041-8205
Electronic ISSN 2041-8213
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 886
Article Number L14
DOI https://doi.org/10.3847/2041-8213/ab5310
Publisher URL https://doi.org/10.3847/2041-8213/ab5310

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