MAXI J1659-152: The shortest orbital period black-hole transient in outburst

E. Kuulkers, C. Kouveliotou, T. Belloni, M. Cadolle Bel, Jérôme Chenevez, M. Diaz Trigo, J. Homan, A. Ibarra, J. A. Kennea, T. Muñoz-Darias, J.-U. Ness, A. N. Parmar, A. M. T. Pollock, E. P. J. van den Heuvel, A. J. van der Horst

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Abstract

MAXI J1659−152 is a bright X-ray transient black-hole candidate binary system discovered in September 2010. We report here on MAXI, RXTE, Swift, and XMM-Newton observations during its 2010/2011 outburst. We find that during the first one and a half week of the outburst the X-ray light curves display drops in intensity at regular intervals, which we interpret as absorption dips. About three weeks into the outbursts, again drops in intensity are seen. These dips have, however, a spectral behaviour opposite to that of the absorption dips, and are related to fast spectral state changes (hence referred to as transition dips). The absorption dips recur with a period of 2.414  ±  0.005 h, which we interpret as the orbital period of the system. This implies that MAXI J1659−152 is the shortest period black-hole candidate binary known to date. The inclination of the accretion disk with respect to the line of sight is estimated to be 65–80°. We propose the companion to the black-hole candidate to be close to an M5 dwarf star, with a mass and radius of about 0.15–0.25 M⊙ and 0.2–0.25 R⊙, respectively. We derive that the companion had an initial mass of about 1.5 M⊙, which evolved to its current mass in about 5–6 billion years. The system is rather compact (orbital separation of ≳1.33 R⊙), and is located at a distance of 8.6  ±  3.7 kpc, with a height above the Galactic plane of 2.4  ±  1.0 kpc. The characteristics of short orbital period and high Galactic scale height are shared with two other transient black-hole candidate X-ray binaries, i.e., XTE J1118+480 and Swift J1735.5−0127. We suggest that all three are kicked out of the Galactic plane into the halo, rather than being formed in a globular cluster.
Original languageEnglish
Article numberA32
JournalAstronomy & Astrophysics
Volume552
Number of pages20
ISSN0004-6361
DOIs
Publication statusPublished - 2013
Event4th International MAXI Workshop: The First Year of MAXI - Tokyo, Japan
Duration: 30 Nov 20102 Dec 2010

Conference

Conference4th International MAXI Workshop
CountryJapan
CityTokyo
Period30/11/201002/12/2010

Keywords

  • MAXI J1659-152
  • Black hole
  • XMM-Newton
  • INTEGRAL and RXTE

Cite this

Kuulkers, E., Kouveliotou, C., Belloni, T., Cadolle Bel, M., Chenevez, J., Trigo, M. D., Homan, J., Ibarra, A., Kennea, J. A., Muñoz-Darias, T., Ness, J-U., Parmar, A. N., Pollock, A. M. T., van den Heuvel, E. P. J., & van der Horst, A. J. (2013). MAXI J1659-152: The shortest orbital period black-hole transient in outburst. Astronomy & Astrophysics, 552, [A32]. https://doi.org/10.1051/0004-6361/201219447