A remarkable recurrent nova in M 31:the optical observations

Darnley, M. J. and Williams, S. C. and Bode, M. F. and Henze, M. and Ness, J.-u. and Shafter, A. W. and Hornoch, K. and Votruba, V. (2014) A remarkable recurrent nova in M 31:the optical observations. Astronomy and Astrophysics, 563. ISSN 0004-6361

[img]
Preview
PDF (1401.2905v2)
1401.2905v2.pdf - Accepted Version

Download (1MB)

Abstract

Context. In late Nov. 2013 the fifth eruption in five years of the M 31 recurrent nova M 31N 2008-12a was announced. Aims: In this Letter we address the optical lightcurve and progenitor system of M 31N 2008-12a. Methods: Optical imaging data of the 2013 eruption from the Liverpool Telescope, La Palma; Danish 1.54 m Telescope, La Silla; and archival Hubble Space Telescope near-IR, optical, and near-UV data are astrometrically and photometrically analysed. Results: Photometry of the 2013 eruption, combined with three previous eruptions, enabled construction of a template lightcurve of a very fast nova (t2(V)≃4 days). The archival data allowed recovery of the progenitor system in optical and near-UV data, indicating a red-giant secondary with bright accretion disk, or alternatively a system with a sub-giant secondary but dominated by a disk. Conclusions: The eruptions of M 31N 2008-12a, and a number of historic X-ray detections, indicate a unique system with a recurrence timescale of ~1 yr. This implies the presence of a very high-mass white dwarf and a high accretion rate. The recovered progenitor system is consistent with such an elevated rate of accretion. We encourage additional observations, especially towards the end of 2014.

Item Type:
Journal Article
Journal or Publication Title:
Astronomy and Astrophysics
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1900/1912
Subjects:
ID Code:
77983
Deposited By:
Deposited On:
27 Jan 2016 09:10
Refereed?:
Yes
Published?:
Published
Last Modified:
18 Sep 2020 02:39