CHANDRA and SWIFT X-RAY OBSERVATIONS of the X-RAY PULSAR SMC X-2 during the OUTBURST of 2015

K. L. Li, C. P. Hu, L. C.C. Lin, Albert K.H. Kong

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2 Citations (Scopus)

Abstract

We report the Chandra/HRC-S and Swift/XRT observations for the 2015 outburst of the high-mass X-ray binary pulsar in the Small Magellanic Cloud, SMC X-2. While previous studies suggested that either an O star or a Be star in the field is the high-mass companion of SMC X-2, our Chandra/HRC-S image unambiguously confirms the O-type star as the true optical counterpart. Using the Swift/XRT observations, we extracted accurate orbital parameters of the pulsar binary through a time of arrivals analysis. In addition, there were two X-ray dips near the inferior conjunction, which are possibly caused by eclipses or an ionized high-density shadow wind near the companion's surface. Finally, we propose that an outflow driven by the radiation pressure from day ∼10 played an important role in the X-ray/optical evolution of the outburst.

Original languageEnglish
Article number74
JournalAstrophysical Journal
Volume828
Issue number2
DOIs
Publication statusPublished - 2016 Sep 10

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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