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The remarkable outburst of the highly evolved post-period-minimum dwarf nova SSS J122221.7−311525⋆

The remarkable outburst of the highly evolved post-period-minimum dwarf nova SSS J122221.7−311525⋆
The remarkable outburst of the highly evolved post-period-minimum dwarf nova SSS J122221.7−311525⋆
We report extensive 3-yr multiwavelength observations of the WZ Sge-type dwarf nova SSS J122221.7−311525 during its unusual double superoutburst, the following decline and in quiescence. The second segment of the superoutburst had a long duration of 33 d and a very gentle decline with a rate of 0.02 mag d−1, and it displayed an extended post-outburst decline lasting at least 500 d. Simultaneously with the start of the rapid fading from the superoutburst plateau, the system showed the appearance of a strong near-infrared excess resulting in very red colours, which reached extreme values (B − I ≃ 1.4) about 20 d later. The colours then became bluer again, but it took at least 250 d to acquire a stable level. Superhumps were clearly visible in the light curve from our very first time-resolved observations until at least 420 d after the rapid fading from the superoutburst. The spectroscopic and photometric data revealed an orbital period of 109.80 min and a fractional superhump period excess ≲0.8 per cent, indicating a very low mass ratio q ≲ 0.045. With such a small mass ratio the donor mass should be below the hydrogen-burning minimum mass limit. The observed infrared flux in quiescence is indeed much lower than is expected from a cataclysmic variable with a near-main-sequence donor star. This strongly suggests a brown-dwarf-like nature for the donor and that SSS J122221.7−311525 has already evolved away from the period minimum towards longer periods, with the donor now extremely dim.
0035-8711
597-618
Neustroev, V.V
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Marsh, T.R.
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Zharikov, S.V.
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Knigge, C.
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Kuulkers, E.
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Osborne, J.P.
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Page, K.L.
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Steeghs, D.
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Suleimanov, V.F.
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Tovmassian, G.
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Breedt, E.
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Frebel, A.
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Garcia-Diaz, Ma. T.
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Hambsch, F.-J.
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Jacobson, H.
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Parsons, S.G.
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Ryu, T.
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Sabin, L.
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Sjoberg, G.
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Miroshnichenko, A.S.
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Reichart, D.E.
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Haislip, J.B.
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Ivarsen, K.M.
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LaCluyze, A.P.
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Moore, J.P.
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Neustroev, V.V
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Marsh, T.R.
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Zharikov, S.V.
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Knigge, C.
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Kuulkers, E.
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Osborne, J.P.
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Page, K.L.
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Steeghs, D.
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Suleimanov, V.F.
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Tovmassian, G.
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Breedt, E.
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Frebel, A.
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Garcia-Diaz, Ma. T.
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Hambsch, F.-J.
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Jacobson, H.
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Parsons, S.G.
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Ryu, T.
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Sabin, L.
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Sjoberg, G.
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Miroshnichenko, A.S.
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Reichart, D.E.
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Haislip, J.B.
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Ivarsen, K.M.
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LaCluyze, A.P.
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Moore, J.P.
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Neustroev, V.V, Marsh, T.R., Zharikov, S.V., Knigge, C., Kuulkers, E., Osborne, J.P., Page, K.L., Steeghs, D., Suleimanov, V.F., Tovmassian, G., Breedt, E., Frebel, A., Garcia-Diaz, Ma. T., Hambsch, F.-J., Jacobson, H., Parsons, S.G., Ryu, T., Sabin, L., Sjoberg, G., Miroshnichenko, A.S., Reichart, D.E., Haislip, J.B., Ivarsen, K.M., LaCluyze, A.P. and Moore, J.P. (2017) The remarkable outburst of the highly evolved post-period-minimum dwarf nova SSS J122221.7−311525⋆. Monthly Notices of the Royal Astronomical Society, 467 (1), 597-618. (doi:10.1093/mnras/stx084).

Record type: Article

Abstract

We report extensive 3-yr multiwavelength observations of the WZ Sge-type dwarf nova SSS J122221.7−311525 during its unusual double superoutburst, the following decline and in quiescence. The second segment of the superoutburst had a long duration of 33 d and a very gentle decline with a rate of 0.02 mag d−1, and it displayed an extended post-outburst decline lasting at least 500 d. Simultaneously with the start of the rapid fading from the superoutburst plateau, the system showed the appearance of a strong near-infrared excess resulting in very red colours, which reached extreme values (B − I ≃ 1.4) about 20 d later. The colours then became bluer again, but it took at least 250 d to acquire a stable level. Superhumps were clearly visible in the light curve from our very first time-resolved observations until at least 420 d after the rapid fading from the superoutburst. The spectroscopic and photometric data revealed an orbital period of 109.80 min and a fractional superhump period excess ≲0.8 per cent, indicating a very low mass ratio q ≲ 0.045. With such a small mass ratio the donor mass should be below the hydrogen-burning minimum mass limit. The observed infrared flux in quiescence is indeed much lower than is expected from a cataclysmic variable with a near-main-sequence donor star. This strongly suggests a brown-dwarf-like nature for the donor and that SSS J122221.7−311525 has already evolved away from the period minimum towards longer periods, with the donor now extremely dim.

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The remarkable outburst of the highly evolved post-period - Accepted Manuscript
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Accepted/In Press date: 11 January 2017
e-pub ahead of print date: 13 January 2017
Organisations: Astronomy Group

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Local EPrints ID: 406990
URI: http://eprints.soton.ac.uk/id/eprint/406990
ISSN: 0035-8711
PURE UUID: edf4c7d2-aa89-4528-8b89-94edd7aafb60

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Date deposited: 29 Mar 2017 01:07
Last modified: 06 Oct 2020 16:42

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Contributors

Author: V.V Neustroev
Author: T.R. Marsh
Author: S.V. Zharikov
Author: C. Knigge
Author: E. Kuulkers
Author: J.P. Osborne
Author: K.L. Page
Author: D. Steeghs
Author: V.F. Suleimanov
Author: G. Tovmassian
Author: E. Breedt
Author: A. Frebel
Author: Ma. T. Garcia-Diaz
Author: F.-J. Hambsch
Author: H. Jacobson
Author: S.G. Parsons
Author: T. Ryu
Author: L. Sabin
Author: G. Sjoberg
Author: A.S. Miroshnichenko
Author: D.E. Reichart
Author: J.B. Haislip
Author: K.M. Ivarsen
Author: A.P. LaCluyze
Author: J.P. Moore

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