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Bright mini-outburst ends the 12 yr long activity of the black hole candidate swift J1753.5-0127

Bright mini-outburst ends the 12 yr long activity of the black hole candidate swift J1753.5-0127
Bright mini-outburst ends the 12 yr long activity of the black hole candidate swift J1753.5-0127
We present optical, UV and X-ray monitoring of the short orbital period black hole X-ray binary candidate Swift J1753.5–0127, focusing on the final stages of its 12−year long outburst that started in 2005. From September 2016 onward, the source started to fade and within three months, the optical flux almost reached the quiescent level. Soon after that, using a new proposed ebrightening classification method we recorded a mini-outburst and a reflare in the optical light curves, peaking in February (V∼17.0) and May (V∼17.9) 2017, respectively. Remarkably, the mini-outburst has a peak flux consistent with the extrapolation of the slow decay before the fading phase preceding it. The following reflare was fainter and shorter. We found from optical colors that the temperature of the outer disk was ∼ 11,000 K when the source started to fade rapidly. According to the disk instability model, this is close to the critical temperature when a cooling wave is expected to form in the disk, shutting down the outburst. The optical color could be a useful tool to predict decay rates in some X-ray transients. We notice that all X-ray binaries that show mini-outbursts following a main outburst are short orbital period systems (< 7 h). In analogy with another class of short period binaries showing similar mini-outbursts, the cataclysmic variables of the RZ LMi type, we suggest mini-outbursts could occur if there is a hot inner disk at the end of the outburst decay.
0004-637X
Zhang, Guo Bao
3837ab47-1edb-4742-9d70-2f1b771fefbf
Charles, Philip
0429b380-0754-4dc1-8def-885c7fa6a086
Zhang, Guo Bao
3837ab47-1edb-4742-9d70-2f1b771fefbf
Charles, Philip
0429b380-0754-4dc1-8def-885c7fa6a086

Zhang, Guo Bao and Charles, Philip (2019) Bright mini-outburst ends the 12 yr long activity of the black hole candidate swift J1753.5-0127. Astrophysical Journal, 876. (doi:10.3847/1538-4357/ab12dd).

Record type: Article

Abstract

We present optical, UV and X-ray monitoring of the short orbital period black hole X-ray binary candidate Swift J1753.5–0127, focusing on the final stages of its 12−year long outburst that started in 2005. From September 2016 onward, the source started to fade and within three months, the optical flux almost reached the quiescent level. Soon after that, using a new proposed ebrightening classification method we recorded a mini-outburst and a reflare in the optical light curves, peaking in February (V∼17.0) and May (V∼17.9) 2017, respectively. Remarkably, the mini-outburst has a peak flux consistent with the extrapolation of the slow decay before the fading phase preceding it. The following reflare was fainter and shorter. We found from optical colors that the temperature of the outer disk was ∼ 11,000 K when the source started to fade rapidly. According to the disk instability model, this is close to the critical temperature when a cooling wave is expected to form in the disk, shutting down the outburst. The optical color could be a useful tool to predict decay rates in some X-ray transients. We notice that all X-ray binaries that show mini-outbursts following a main outburst are short orbital period systems (< 7 h). In analogy with another class of short period binaries showing similar mini-outbursts, the cataclysmic variables of the RZ LMi type, we suggest mini-outbursts could occur if there is a hot inner disk at the end of the outburst decay.

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Bright Mini-outburst Ends the 12 yr Long Activity of the Black Hole Candidate Swift J1753.5-0127 - Accepted Manuscript
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Accepted/In Press date: 21 March 2019
e-pub ahead of print date: 26 April 2019
Published date: 26 April 2019

Identifiers

Local EPrints ID: 432419
URI: http://eprints.soton.ac.uk/id/eprint/432419
ISSN: 0004-637X
PURE UUID: b795a95a-73c9-46fb-bad4-14e3f57ac12a

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Date deposited: 12 Jul 2019 16:31
Last modified: 06 Oct 2020 19:18

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