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Swift detection of the super-swift switch-on of the super-soft phase in nova V745 Sco (2014)

Page, KL and Osborne, JP and Kuin, NPM and Henze, M and Walter, FM and Beardmore, AP and Bode, MF and Darnley, MJ and Delgado, L and Drake, JJ and Hernanz, M and Mukai, K and Nelson, T and Ness, J-U and Schwarz, GJ and Shore, SN and Starrfield, S and Woodward, CE (2015) Swift detection of the super-swift switch-on of the super-soft phase in nova V745 Sco (2014). Monthly Notices of the Royal Astronomical Society, 454 (3). pp. 3108-3120. ISSN 0035-8711

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Abstract

V745 Sco is a recurrent nova, with the most recent eruption occurring in February 2014. V745 Sco was first observed by Swift a mere 3.7 hr after the announcement of the optical discovery, with the super-soft X-ray emission being detected around four days later and lasting for only ~two days, making it both the fastest follow-up of a nova by Swift and the earliest switch-on of super-soft emission yet detected. Such an early switch-on time suggests a combination of a very high velocity outflow and low ejected mass and, together with the high effective temperature reached by the super-soft emission, a high mass white dwarf (>1.3 M_sun). The X-ray spectral evolution was followed from an early epoch where shocked emission was evident, through the entirety of the super-soft phase, showing evolving column density, emission lines, absorption edges and thermal continuum temperature. UV grism data were also obtained throughout the super-soft interval, with the spectra showing mainly emission lines from lower ionization transitions and the Balmer continuum in emission. V745 Sco is compared with both V2491 Cyg (another nova with a very short super-soft phase) and M31N 2008-12a (the most rapidly recurring nova yet discovered). The longer recurrence time compared to M31N 2008-12a could be due to a lower mass accretion rate, although inclination of the system may also play a part. Nova V745 Sco (2014) revealed the fastest evolving super-soft source phase yet discovered, providing a detailed and informative dataset for study.

Item Type: Article
Additional Information: his is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society following peer review. The version of record MNRAS (December 11, 2015) 454 (3): 3108-3120. is available online at:http://dx.doi.org/10.1093/mnras/stv2144
Uncontrolled Keywords: astro-ph.SR; astro-ph.SR; astro-ph.HE
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 22 Sep 2015 08:38
Last Modified: 23 Mar 2016 11:45
URI: http://researchonline.ljmu.ac.uk/id/eprint/2055

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