Morii, M;
Serino, M;
Mihara, T;
Sugizaki, M;
Matsuoka, M;
Tomida, H;
Kimura, M;
... Tsunemi, H; + view all
(2013)
Extraordinary luminous soft x-ray transient MAXI J0158-744 as an ignition of a nova on a very massive o-Ne white dwarf.
Astrophysical Journal
, 779
(2)
10.1088/0004-637X/779/2/118.
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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 s < ΔTd < 1.10 × 10 s), a rapid rise (<5.5 × 10 s), and a huge peak luminosity of 2 × 10 erg s 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.
| Type: | Article |
|---|---|
| Title: | Extraordinary luminous soft x-ray transient MAXI J0158-744 as an ignition of a nova on a very massive o-Ne white dwarf |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1088/0004-637X/779/2/118 |
| Publisher version: | http://dx.doi.org/10.1088/0004-637X/779/2/118 |
| Language: | English |
| Additional information: | © 2013. The American Astronomical Society. All rights reserved. |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1462513 |
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