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|a Neustroev, V. V.
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|a Massachusetts Institute of Technology. Department of Physics
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|a MIT Kavli Institute for Astrophysics and Space Research
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|a Marsh, T. R.
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|a Zharikov, S. V.
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|a Knigge, C.
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|a Kuulkers, E.
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|a Osborne, J. P.
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|a Page, K. L.
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|a Steeghs, D.
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|a Suleimanov, V. F.
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|a Tovmassian, G.
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|a Breedt, E.
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|a Frebel, Anna L.
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|a García-Díaz, Ma. T.
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|a Hambsch, F.-J.
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|a Jacobson, Heather
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|a Parsons, S. G.
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|a Ryu, T.
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|a Sabin, L.
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|a Sjoberg, G.
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|a Miroshnichenko, A. S.
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|a Reichart, D. E.
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|a Haislip, J. B.
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|a Ivarsen, K. M.
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|a LaCluyze, A. P.
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|a Moore, J. P.
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|a The remarkable outburst of the highly-evolved post period-minimum dwarf nova SSS J122221.7−311525
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|b Oxford University Press (OUP),
|c 2019-06-24T15:54:17Z.
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|z Get fulltext
|u https://hdl.handle.net/1721.1/121391
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|a 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 nearmain- 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. Keywords: binaries: close; stars: evolution; stars: individual: SSS J122221.7−311525; novae; cataclysmic variables
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|a Article
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|t Monthly Notices of the Royal Astronomical Society
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