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Title:
The long-term evolution of the accreting millisecond X-ray pulsar Swift J1756.9-2508
Authors:
Patruno, Alessandro; Altamirano, Diego; Messenger, Chris
Publication:
eprint arXiv:0910.2920
Publication Date:
10/2009
Origin:
ARXIV
Keywords:
Astrophysics - High Energy Astrophysical Phenomena
Comment:
7 pages, 4 figures, submitted to MNRAS
Bibliographic Code:
2009arXiv0910.2920P

Abstract

We present a timing analysis of the 2009 outburst of the accreting millisecond X-ray pulsar Swift J1756.9-2508, and a re-analysis of the 2007 outburst. The source shows a short recurrence time of only ~2 years between outbursts. Thanks to the approximately 2 year long baseline of data, we can constrain the magnetic field of the neutron star to be 0.4x10^8 G < B < 9x10^8 G, which is within the range of typical accreting millisecond pulsars. The 2009 timing analysis allows us to put constraints on the accretion torque: the spin frequency derivative within the outburst has an upper limit of $|\dot{\nu}| < 3x10^-13 Hz/s at the 95% confidence level. A study of pulse profiles and their evolution during the outburst is analyzed, suggesting a systematic change of shape that depends on the outburst phase.
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