An extremely fast fading population II dwarf nova candidate: caught spectroscopically on the rise
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| Main Authors: | , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866914365999939584 |
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| author | Van Bemmel, Natasha Zhang, Jielai Cooke, Jeff Möller, Anais Andreoni, Igor Auchettl, Katie Buckley, David Carney, Jonathan Dobie, Dougal Freeburn, James Gendre, Bruce Kansal, Vanshika Monageng, Itumeleng Rau, Arne Rawat, Nikita Suhr, Mark Taylor, Edward N. |
| author_facet | Van Bemmel, Natasha Zhang, Jielai Cooke, Jeff Möller, Anais Andreoni, Igor Auchettl, Katie Buckley, David Carney, Jonathan Dobie, Dougal Freeburn, James Gendre, Bruce Kansal, Vanshika Monageng, Itumeleng Rau, Arne Rawat, Nikita Suhr, Mark Taylor, Edward N. |
| contents | We present AT2022kak, a rapidly evolving optical transient discovered by the KiloNova and Transients Program (KNTraP). This interesting burst exhibited extremely fast evolution, with a large amplitude blue outburst of m > 3.3 in a single night, and a rapid fade back to quiescence in the following two nights. We deployed a multi-wavelength follow-up campaign, monitoring the object for the next two months, but saw no recurrent burst. Three years later, while observing to get spectroscopy of the object in quiescence, there was a new outburst, enabling the collection of time-resolved spectra of the rise and fade of the outburst. The light curve properties of the first burst and spectra of the second burst are consistent with a dwarf nova. Its fast evolving behaviour makes it one of the fastest and faintest dwarf novae observed. The estimated distance of AT2022kak from the Galactic centre is ~6.6 kpc, with a scale height of ~2 kpc. This scale height places it in the Galactic thick disk, where only very few dwarf novae have been found, and is therefore a potential Population II dwarf novae system. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2510_26682 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | An extremely fast fading population II dwarf nova candidate: caught spectroscopically on the rise Van Bemmel, Natasha Zhang, Jielai Cooke, Jeff Möller, Anais Andreoni, Igor Auchettl, Katie Buckley, David Carney, Jonathan Dobie, Dougal Freeburn, James Gendre, Bruce Kansal, Vanshika Monageng, Itumeleng Rau, Arne Rawat, Nikita Suhr, Mark Taylor, Edward N. Solar and Stellar Astrophysics We present AT2022kak, a rapidly evolving optical transient discovered by the KiloNova and Transients Program (KNTraP). This interesting burst exhibited extremely fast evolution, with a large amplitude blue outburst of m > 3.3 in a single night, and a rapid fade back to quiescence in the following two nights. We deployed a multi-wavelength follow-up campaign, monitoring the object for the next two months, but saw no recurrent burst. Three years later, while observing to get spectroscopy of the object in quiescence, there was a new outburst, enabling the collection of time-resolved spectra of the rise and fade of the outburst. The light curve properties of the first burst and spectra of the second burst are consistent with a dwarf nova. Its fast evolving behaviour makes it one of the fastest and faintest dwarf novae observed. The estimated distance of AT2022kak from the Galactic centre is ~6.6 kpc, with a scale height of ~2 kpc. This scale height places it in the Galactic thick disk, where only very few dwarf novae have been found, and is therefore a potential Population II dwarf novae system. |
| title | An extremely fast fading population II dwarf nova candidate: caught spectroscopically on the rise |
| topic | Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2510.26682 |