Extraordinary luminous soft X-ray transient MAXI J0158-744 as an ignition of a nova on a very massive O-Ne white dwarf
| Autor: | Morii, M., Tomida, H., Kimura, M., Suwa, F., Negoro, H., Serino, M., Kennea, J. A., Page, K. L., Curran, P. A., Walter, F. M., Kuin, N. P. M., Pritchard, T., Nakahira, S., Hiroi, K., Usui, R., Kawai, N., Osborne, J. P., 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. |
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| Rok vydání: | 2013 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1088/0004-637X/779/2/118 |
| Popis: | 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 x 10^3 s < \Delta T_d < 1.10 x 10^4 s), a very rapid rise (< 5.5 x 10^3 s), and a huge peak luminosity of 2 x 10^40 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 (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. Comment: 33 pages, 5 figures, Accepted for publication by ApJ |
| Databáze: | arXiv |
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