Discovery of long-term superorbital periodicities in the pseudo-transient LMXBs: IGR J17098−3628 and EXO 0748−676

Kotze, M.; Charles, P. A.; Crause, Lisa A.

doi:10.1111/j.1365-2966.2009.14640.x

Cited by 3 publications

(5 citation statements)

References 19 publications

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“…A P sup of 163 d was detected during the higher state in this quasi‐persistent LMXB. It is clearly not stable and shows steady evolution with several significant detected signals in the DPS during the portions of the higher state where the previously published superorbital periods were noted (Kotze et al 2009). There is no evidence for periodic signals in the low state.…”

Section: Discussionmentioning

confidence: 71%

“…IGR J17098−3628 has an unknown location on Fig. 1, but in Kotze et al (2009) we argued that, based on the apparent similarities with EXO 0748−676, IGR J17098−3628 likely also has P orb < 1 d. As an LMXB with P orb < 1 d, IGR J17098−3628 would not be expected to produce steadily precessing warped accretion discs (OD01).…”

Section: Discussionmentioning

confidence: 87%

“… a Charles et al (2008) and references therein; Wen et al (2006) and references therein; c Liu et al (2007) and references therein; d Kotze, Charles & Crause (2009); e Leahy & Igna (2010); f quoted as ∼62 d (OD01), not ∼62 h (Kudryavtsev et al 1989); g Priedhorsky & Terrell (1984). …”

Section: Introductionmentioning

confidence: 99%

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Characterizing X-ray binary long-term variability

Kotze

Charles

2011

Monthly Notices of the Royal Astronomical Society

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Long-term ("superorbital") periods or modulations have been detected in a wide variety of both low and high-mass X-ray binaries at X-ray and optical wavelengths. A variety of mechanisms have been proposed to account for the variability properties, such as precessing and/or warped accretion discs, amongst others. The All Sky Monitor on board the Rossi X-ray Timing Explorer provides the most extensive (~15 years) and sensitive X-ray archive for studying such behaviour. It is also clear that such variations can be intermittent and/or a function of X-ray spectral state. Consequently, we use a time-dependent Dynamic Power Spectrum method to examine how these modulations vary with time in 25 X-ray binaries for which superorbital periodicities have been previously reported. Our aim is to characterize these periodicities in a completely systematic way. Some (such as Her X-1 and LMC X-4) are remarkably stable, but others show a range of properties, from even longer variability time-scales to quite chaotic behaviour.Comment: 17 pages, 26 figures, 4 tables, Accepted for publication in MNRAS on 4 November 201

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Section: Discussionmentioning

confidence: 71%

Section: Discussionmentioning

confidence: 87%

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Characterizing X-ray binary long-term variability

Kotze

Charles

2011

Monthly Notices of the Royal Astronomical Society

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“…As of the date of the present work, the source reached about two years of activity. In spite of the long duration, it is not the longest outburst ever seen from a transient BHC (see for example the nearby X-ray transient IGR J17098-3628 [14]). Are these changes in IGR J17091-3624 behaviour representing an evolution from a transient source to a persistent one as happened for GRS 1915+105?…”

Section: Discussionmentioning

confidence: 99%

IGR J17091-3624: a GRS 1915-105 like source as seen by INTEGRAL and Swift

Capitanio¹,

Delsanto²,

Bozzo³

et al. 2013

Proceedings of an INTEGRAL View of the High-Energy Sky (The First 10 Years) - 9th INTEGRAL Workshop and Celebration of the 10t

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We present here the main characteristics of the BHC IGR J17091-3624 outbursts occurred several times since 1994. Since 2003, the source has been extensively observed by INTEGRAL and Swift. In particular, we report results on the last 2011 outburst that showed a rare variability behaviour observed before only in the galactic BH GRS 1915+105 but at a different level of flux.Several hypotheses have been proposed in order to explain this particular behaviour. They are all discussed here, in the light of their apparent contradiction. Finally, based on all available informations, we attempt to give an overall view of this enigmatic source and we speculate on the evolutionary state of the binary system. An INTEGRAL view of the high-energy sky (the first 10 years) -9th INTEGRAL Workshop and celebration of the 10th anniversary of the launch

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“…Although Ogilvie and Dubus (2001) showed that not all LMXBs are likely to experience warping, there is strong observational evidence in our case for some form of disk structures that must be present above the disk plane. Kotze et al (2009) analyzed the long term RXTE ASM light curve of EXO 0748-676 and carried out a period search using the Lomb Scargle method and reported a super-orbital period corresponding to 180.8±0.3 d during the "active" state. They interpret this super-orbital periodicity as a consequence of coupled precessional and warping effects.…”

Section: Irradiation Induced Vertical Structuresmentioning

confidence: 99%

X-ray and optical orbital modulation of EXO 0748-676: A co-variability study using XMM-Newton

Raman

Paul

2017

New Astronomy

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We present a multi-wavelength timing study of the eclipsing low mass X-ray binary EXO 0748-676 (UY Vol) using XMM-Newton when the source was in a hard spectral state. The orbital optical and X-ray light curves show a fairly large amount of intensity modulation in the 7 observations taken during September-November, 2003, covering 36 complete binary orbits of EXO 0748-676. While assessing the non-burst variability, simultaneously in the optical and X-ray light curves, we find that they are not correlated at reprocessing or orbital time-scales, but are weakly correlated at a few 1000s of seconds time-scales. Although a large fraction of the optical emission is likely to be due to reprocessing, the lack of significant correlation and presence of large variability in the orbital X-ray and optical light curves is probably due to structures and structural changes in the accretion disk that produce, and sometimes mask the reprocessed signal in varying amounts. These disk structures could be induced, at least partly, by irradiation. From the observed modulations seen in the optical light curves, there is strong evidence of accretion disk evolution at time scales of a few hours.

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Discovery of long-term superorbital periodicities in the pseudo-transient LMXBs: IGR J17098−3628 and EXO 0748−676

Cited by 3 publications

References 19 publications

Characterizing X-ray binary long-term variability

Characterizing X-ray binary long-term variability

IGR J17091-3624: a GRS 1915-105 like source as seen by INTEGRAL and Swift

X-ray and optical orbital modulation of EXO 0748-676: A co-variability study using XMM-Newton

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