Millihertz Quasi-periodic Optical Oscillations in 4U 0614+091

Details Millihertz Quasi-periodic Optical Oscillations in 4U 0614+091 Millihertz Quasi-periodic Optical Oscillations in 4U 0614+091

2011-10-06

arxiv.org/abs/1110.1267v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

7 pages, 5 figures, accepted for publication in Monthly Notices of the Royal Astronomical Society

Scientific paper

We report the discovery of a 1mHz optical quasi-periodic oscillation (QPO) in the candidate ultracompact low-mass X-ray binary 4U 0614+091. The ultra-low frequency QPO has no X-ray counterpart in contemporaneous RXTE/PCA data and is likely a signature of structure in the accretion disk. The QPO can be reasonably fitted with a single sine wave but with a phase jump part way through the observation, indicating that it is not coherent.We also identify a 48 min modulation, approximately consistent with the suggested orbital period of O'Brien (2005) and Shahbaz et al. (2008). If this is indeed orbital, it supports an identification of 4U 0614+091 as an ultra-compact source.

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