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    Extraordinary luminous soft x-ray transient maxi j0158-744 as an ignition of a nova on a very massive o-ne white dwarf

    245575_194558.pdf (1.107Mb)
    Access Status
    Open access
    Authors
    Morii, M.
    Tomida, H.
    Kimura, M.
    Suwa, F.
    Negoro, H.
    Serino, M.
    Kennea, J.
    Curran, Peter
    Walter, F.
    Kuin, N.
    Pritchard, T.
    Nakahira, S.
    Hiroi, K.
    Usui, R.
    Kawai, N.
    Osborne, J.
    Mihara, T.
    Sugizaki, M.
    Gehrels, N.
    Kohama, M.
    Kotani, T.
    Matsuoka, M.
    Nakajima, M.
    Roming, P.
    Sakamoto, T.
    Sugimori, K.
    Tsuboi, Y.
    Tsunemi, H.
    Ueda, Y.
    Ueno, S.
    Yoshida, A.
    Date
    2013
    Type
    Journal Article
    
    Metadata
    Show full item record
    Citation
    Morii, M. and Tomida, H. and Kimura, M. and Suwa, F. and Negoro, H. and Serino, M. and Kennea, J. et al. 2013. Extraordinary luminous soft x-ray transient maxi j0158-744 as an ignition of a nova on a very massive o-ne white dwarf. The Astrophysical Journal. 779 (2).
    Source Title
    The Astrophysical Journal
    DOI
    10.1088/0004-637X/779/2/118
    ISSN
    0004-637X
    School
    Department of Physics and Astronomy
    Remarks

    ©2013. The American Astronomical Society. All rights reserved.

    URI
    http://hdl.handle.net/20.500.11937/7188
    Collection
    • Curtin Research Publications
    Abstract

    We present the observation of an extraordinary luminous soft X-ray transient, MAXI J0158-744, by the Monitor of All-sky X-ray Image (MAXI) on 2011 November 11. This transient is characterized by a soft X-ray spectrum, a short duration (1.3 × 103 s < Td < 1.10 × 104 s), a very rapid rise (< 5.5 × 103 s), and a huge peak luminosity of 2×1040 erg s-1 in 0.7-7.0 keV band. With Swift observations and optical spectroscopy from the Small and Moderate Aperture Research Telescope System (SMARTS), we confirmed that the transient is a nova explosion, on a white dwarf in a binary with a Be star, located near the Small Magellanic Cloud. An extremely early turn-on of the super-soft X-ray source (SSS) phase (< 0.44 d), the short SSS phase duration of about one month, and a 0.92 keV neon emission line found in the third MAXI scan, 1296 s after the first detection, suggest that the explosion involves a small amount of ejecta and is produced on an unusually massive O-Ne white dwarf close to, or possibly over, the Chandrasekhar limit. We propose that the huge luminosity detected with MAXI was due to the fireball phase, a direct manifestation of the ignition of the thermonuclear runaway process in a nova explosion.

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