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Darnley, MJ, Henze, M, Bode, MF, Hachisu, I, Hernanz, M, Hornoch, K, Hounsell, R, Kato, M, Ness, J-U, Osborne, JP, Page, KL, Ribeiro, VARM, Rodriguez-Gil, P, Shafter, AW, Shara, MM, Steele, IA, Williams, SC, Arai, A, Arcavi, I, Barsukova, EA et al (2016) M31N 2008-12a - the remarkable recurrent nova in M31: Pan-chromatic observations of the 2015 eruption. Astrophysical Journal, 833 (2). ISSN 0004-637X
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Abstract
The Andromeda Galaxy recurrent nova M31N 2008-12a had been observed in eruption ten times, including yearly eruptions from 2008-2014. With a measured recurrence period of $P_\mathrm{rec}=351\pm13$ days (we believe the true value to be half of this) and a white dwarf very close to the Chandrasekhar limit, M31N 2008-12a has become the leading pre-explosion supernova type Ia progenitor candidate. Following multi-wavelength follow-up observations of the 2013 and 2014 eruptions, we initiated a campaign to ensure early detection of the predicted 2015 eruption, which triggered ambitious ground and space-based follow-up programs. In this paper we present the 2015 detection; visible to near-infrared photometry and visible spectroscopy; and ultraviolet and X-ray observations from the Swift observatory. The LCOGT 2m (Hawaii) discovered the 2015 eruption, estimated to have commenced at Aug. $28.28\pm0.12$ UT. The 2013-2015 eruptions are remarkably similar at all wavelengths. New early spectroscopic observations reveal short-lived emission from material with velocities $\sim13000$ km s$^{-1}$, possibly collimated outflows. Photometric and spectroscopic observations of the eruption provide strong evidence supporting a red giant donor. An apparently stochastic variability during the early super-soft X-ray phase was comparable in amplitude and duration to past eruptions, but the 2013 and 2015 eruptions show evidence of a brief flux dip during this phase. The multi-eruption Swift/XRT spectra show tentative evidence of high-ionization emission lines above a high-temperature continuum. Following Henze et al. (2015a), the updated recurrence period based on all known eruptions is $P_\mathrm{rec}=174\pm10$ d, and we expect the next eruption of M31N 2008-12a to occur around mid-Sep. 2016.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | astro-ph.SR; astro-ph.SR; astro-ph.HE |
| Subjects: | Q Science > QB Astronomy |
| Divisions: | Astrophysics Research Institute |
| Publisher: | American Astronomical Society; IOP Publishing |
| Related URLs: | |
| Date of acceptance: | 29 August 2016 |
| Date of first compliant Open Access: | 9 September 2016 |
| Date Deposited: | 09 Sep 2016 14:58 |
| Last Modified: | 04 Sep 2021 12:32 |
| DOI or ID number: | 10.3847/1538-4357/833/2/149 |
| URI: | https://ljmu-9.eprints-hosting.org/id/eprint/4126 |
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