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The 2019 eruption of recurrent nova V3890 Sgr: observations by Swift, NICER and SMARTS

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posted on 2020-11-03, 14:16 authored by KL Page, NPM Kuin, AP Beardmore, FM Walter, JP Osborne, CB Markwardt, J-U Ness, M Orio, KV Sokolovsky
V3890 Sgr is a recurrent nova which has been seen in outburst three times so far, with the most recent eruption occurring on 2019 August 27 UT. This latest outburst was followed in detail by the Neil Gehrels Swift Observatory, from less than a day after the eruption until the nova entered the Sun observing constraint, with a small number of additional observations after the constraint ended. The X-ray light-curve shows initial hard shock emission, followed by an early start of the super-soft source phase around day 8.5, with the soft emission ceasing by day 26. Together with the peak blackbody temperature of the super-soft spectrum being ~100 eV, these timings suggest the white dwarf mass to be high, ~1.3 M_sun. The UV photometric light-curve decays monotonically, with the decay rate changing a number of times, approximately simultaneously with variations in the X-ray emission. The UV grism spectra show both line and continuum emission, with emission lines of N, C, Mg and O being notable. These UV spectra are best dereddened using an SMC extinction law. Optical spectra from SMARTS show evidence of interaction between the nova ejecta and wind from the donor star, as well as the extended atmosphere of the red giant being flash-ionized by the super-soft X-ray photons. Data from NICER reveal a transient 83 s quasi-periodic oscillation, with a modulation amplitude of 5 per cent, adding to the sample of novae which show such short variabilities during their super-soft phase.

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Citation

Monthly Notices of the Royal Astronomical Society, Volume 499, Issue 4, December 2020, Pages 4814–4831, https://doi.org/10.1093/mnras/staa3083

Author affiliation

Department of Physics and Astronomy

Version

  • AM (Accepted Manuscript)

Published in

Monthly Notices of the Royal Astronomical Society

Volume

499

Issue

4

Pagination

4814-4831

Publisher

Oxford University Press (OUP) for Royal Astronomical Society

issn

0035-8711

Acceptance date

2020-10-02

Copyright date

2020

Available date

2021-03-24

Notes

Accepted for publication

Language

en

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