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

Page, K. L ; Osborne, J. P ; Kuin, N. P. M ; Henze, M ; Walter, F. M ; Beardmore, A. P ; Bode, M. F ; Darnley, M. J ; Delgado, L ; Drake, J. J ; Hernanz, M ; Mukai, K ; Nelson, T ; Ness, J.-U ; Schwarz, G. J ; Shore, S. N ; Starrfield, S ; Woodward, C. E

Monthly notices of the Royal Astronomical Society, 2015-12, Vol.454 (3), p.3108-3120 [Periódico revisado por pares]

London: Oxford University Press

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  • Título:
    Swift detection of the super-swift switch-on of the super-soft phase in nova V745 Sco (2014)
  • Autor: Page, K. L ; Osborne, J. P ; Kuin, N. P. M ; Henze, M ; Walter, F. M ; Beardmore, A. P ; Bode, M. F ; Darnley, M. J ; Delgado, L ; Drake, J. J ; Hernanz, M ; Mukai, K ; Nelson, T ; Ness, J.-U ; Schwarz, G. J ; Shore, S. N ; Starrfield, S ; Woodward, C. E
  • Assuntos: Continuums ; Emission ; Evolution ; Inclination ; Nova ; Phase transitions ; Spectral emissivity ; Spectral lines ; Spectrum analysis ; Supernovae ; X rays ; X-ray astronomy
  • É parte de: Monthly notices of the Royal Astronomical Society, 2015-12, Vol.454 (3), p.3108-3120
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: 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 h after the announcement of the optical discovery, with the super-soft X-ray emission being detected around 4 d later and lasting for only ∼2 d, 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⊙). 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 data set for study.
  • Editor: London: Oxford University Press
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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