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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|
Kennea, J. A.
Page, Kim L.
Curran, P. A.
Walter, F. M.
Kuin, N. P. M.
Osborne, Julian Paul
Roming, P. W. A.
|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.|
|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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