Discovery of an Extraordinary Luminous And Soft X-ray Transient MAXI J0158–744

Morii, Mikio; Tomida, Hiroshi; Kimura, Masaki; Suwa, Fumitoshi; Negoro, Hitoshi; Serino, Motoko; Kennea, Jamie A.; Page, Kim L.; Curran, Peter A.; Walter, Frederick M.

doi:10.7566/JPSCP.4.015002

Discovery of an Extraordinary Luminous And Soft X-ray Transient MAXI J0158–744

2015

4 pages

Part of Proceedings, International Symposium “Nanoscience and Quantum Physics 2012” (nanoPHYS’12) : Tokyo, Japan, December 17-19, 2012

Published in:

JPS Conf.Proc. 4 (2015) 015002

Contribution to:

- nanoPHYS'12

Published: in 2015

DOI:

10.7566/JPSCP.4.015002

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Abstract: (Physical Society of Japan)

Monitor of All-sky X-ray Image (MAXI) is an X-ray all-sky monitor in operation now. MAXI GSC and SSC are sensitive in the 2–30 and 0.5–12 keV bands, respectively. On November 11, 2011 (UT), MAXI GSC discovered an unusually luminous and soft X-ray transient, MAXI J0158–744, on the outskirts of the Small Magellanic Cloud (SMC). The outburst lasted for no more than three hours and the luminosity peaked at ∼10^40 erg s^−1. By the Swift follow-up observation and the optical spectroscopy, we find that the transient was a kind of the nova explosion on a white dwarf in a binary paired with a Be star. We discuss that the outburst can be explained as shock-induced emission caused by a nova explosion in a dense circumstellar medium around a Be star or a photospheric emission on an ignition of a nova explosion. Its fast optical decay (t_2 = 1.9 ± 0.2 days) and extremely early turn-on (<0.44 days) of the super-soft X-ray phase suggest that the white dwarf is very massive.

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