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Title: Extraordinary luminous soft x-ray transient maxi j0158-744 as an ignition of a nova on a very massive o-ne white dwarf
Authors: Morii, M.
Tomida, H.
Kimura, M.
Suwa, F.
Negoro, H.
Serino, M.
Kennea, J. A.
Page, Kim L.
Curran, P. A.
Walter, F. M.
Kuin, N. P. M.
Pritchard, T.
Nakahira, S.
Hiroi, K.
Usui, R.
Kawai, N.
Osborne, Julian Paul
Mihara, T.
Sugizaki, M.
Gehrels, N.
Kohama, M.
Kotani, T.
Matsuoka, M.
Nakajima, M.
Roming, P. W. A.
Sakamoto, T.
Sugimori, K.
Tsuboi, Y.
Tsunemi, H.
Ueda, Y.
Ueno, S.
Yoshida, A.
First Published: 2-Dec-2013
Publisher: IOP Publishing LTD
Citation: Astrophysical Journal, 2013, 779 (2), 118
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 × 10[Superscript: 3] s < ΔTd < 1.10 × 10[Superscript: 4] s), a rapid rise (<5.5 × 10[Superscript: 3] s), and a huge peak luminosity of 2 × 10[Superscript: 40] 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, 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 early turn-on of the super-soft X-ray source (SSS) phase (<0.44 days), 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.
DOI Link: 10.1088/0004-637X/779/2/118
ISSN: 0004-637X
eISSN: 1538-4357
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2013. The American Astronomical Society. All rights reserved. Deposited with reference to the publisher’s archiving policy available on the SHERPA/RoMEO website.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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