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...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
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Oxford University Press (OUP)
2019
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| Online Access: | https://hdl.handle.net/1721.1/121391 |
| _version_ | 1826201741128892416 |
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| author | 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, Anna L. García-Díaz, Ma. T. Hambsch, F.-J. Jacobson, Heather Parsons, S. G. Ryu, T. Sabin, L. Sjoberg, G. Miroshnichenko, A. S. Reichart, D. E. Haislip, J. B. Ivarsen, K. M. LaCluyze, A. P. Moore, J. P. |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics 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, Anna L. García-Díaz, Ma. T. Hambsch, F.-J. Jacobson, Heather Parsons, S. G. Ryu, T. Sabin, L. Sjoberg, G. Miroshnichenko, A. S. Reichart, D. E. Haislip, J. B. Ivarsen, K. M. LaCluyze, A. P. Moore, J. P. |
| author_sort | Neustroev, V. V. |
| collection | MIT |
| description | 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 |
| first_indexed | 2024-09-23T11:56:00Z |
| format | Article |
| id | mit-1721.1/121391 |
| institution | Massachusetts Institute of Technology |
| last_indexed | 2024-09-23T11:56:00Z |
| publishDate | 2019 |
| publisher | Oxford University Press (OUP) |
| record_format | dspace |
| spelling | mit-1721.1/1213912022-10-01T07:05:23Z The remarkable outburst of the highly-evolved post period-minimum dwarf nova SSS J122221.7−311525 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, Anna L. García-Díaz, Ma. T. Hambsch, F.-J. Jacobson, Heather Parsons, S. G. Ryu, T. Sabin, L. Sjoberg, G. Miroshnichenko, A. S. Reichart, D. E. Haislip, J. B. Ivarsen, K. M. LaCluyze, A. P. Moore, J. P. Massachusetts Institute of Technology. Department of Physics MIT Kavli Institute for Astrophysics and Space Research 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 2019-06-24T15:54:17Z 2019-06-24T15:54:17Z 2017-05 2016-05 2019-03-22T13:56:23Z Article http://purl.org/eprint/type/JournalArticle 0035-8711 1365-2966 https://hdl.handle.net/1721.1/121391 Neustroev, V. V. et al. “The Remarkable Outburst of the Highly-Evolved Post Period-Minimum Dwarf Nova SSS J122221.7−311525.” Monthly Notices of the Royal Astronomical Society (January 2017): stx084 © 2017 The Authors http://dx.doi.org/10.1093/MNRAS/STX084 Monthly Notices of the Royal Astronomical Society Creative Commons Attribution-Noncommercial-Share Alike http://creativecommons.org/licenses/by-nc-sa/4.0/ application/pdf Oxford University Press (OUP) arXiv |
| spellingShingle | 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, Anna L. García-Díaz, Ma. T. Hambsch, F.-J. Jacobson, Heather Parsons, S. G. Ryu, T. Sabin, L. Sjoberg, G. Miroshnichenko, A. S. Reichart, D. E. Haislip, J. B. Ivarsen, K. M. LaCluyze, A. P. Moore, J. P. The remarkable outburst of the highly-evolved post period-minimum dwarf nova SSS J122221.7−311525 |
| title | The remarkable outburst of the highly-evolved post period-minimum dwarf nova SSS J122221.7−311525 |
| title_full | The remarkable outburst of the highly-evolved post period-minimum dwarf nova SSS J122221.7−311525 |
| title_fullStr | The remarkable outburst of the highly-evolved post period-minimum dwarf nova SSS J122221.7−311525 |
| title_full_unstemmed | The remarkable outburst of the highly-evolved post period-minimum dwarf nova SSS J122221.7−311525 |
| title_short | The remarkable outburst of the highly-evolved post period-minimum dwarf nova SSS J122221.7−311525 |
| title_sort | remarkable outburst of the highly evolved post period minimum dwarf nova sss j122221 7 311525 |
| url | https://hdl.handle.net/1721.1/121391 |
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