Hunt for the mHz variability in the TESS and XMM-Newton observations of nova-like cataclysmic variables
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arXiv
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| Natura: | Preprint |
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2025
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| author | Dobrotka, Andrej Magdolen, Jozef Melicherčík, Martin |
| author_facet | Dobrotka, Andrej Magdolen, Jozef Melicherčík, Martin |
| contents | We analysed the flickering of selected nova-like cataclysmic variables observed by the TESS satellite and XMM-Newton. We searched for break frequencies ($f_{\rm b}$) in the corresponding power density spectra (PDS), and for any long-term evolution. We found a new optical $f_{\rm b}$ in three nova-like systems and confirmed that the value of this frequency is clustered around 1 mHz. V504 Cen and V751 Cyg show possible X-ray counterparts of $f_{\rm b}$ that had previously only been seen in MV Lyr. This points towards the very central disc for source localisation. We investigated a previously proposed correlation between white dwarf mass and $f_{\rm b}$, but thanks to the new measurements we do not conclude its existence. V3885 Sgr and V1193 Ori show flaring activity in the long-term light curve during which TESS observations were made. The corresponding PDSs show changes in shape and disappearance of $f_{\rm b}$. TT Ari and SGRt 062340.2-265715 exhibit smooth changes in the long-term optical light curve, and the corresponding TESS observations show variable $f_{\rm b}$ during these changes. $f_{\rm b}$ is higher for lower brightness, which was seen only in MV Lyr so far. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2510_02834 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Hunt for the mHz variability in the TESS and XMM-Newton observations of nova-like cataclysmic variables Dobrotka, Andrej Magdolen, Jozef Melicherčík, Martin High Energy Astrophysical Phenomena Solar and Stellar Astrophysics We analysed the flickering of selected nova-like cataclysmic variables observed by the TESS satellite and XMM-Newton. We searched for break frequencies ($f_{\rm b}$) in the corresponding power density spectra (PDS), and for any long-term evolution. We found a new optical $f_{\rm b}$ in three nova-like systems and confirmed that the value of this frequency is clustered around 1 mHz. V504 Cen and V751 Cyg show possible X-ray counterparts of $f_{\rm b}$ that had previously only been seen in MV Lyr. This points towards the very central disc for source localisation. We investigated a previously proposed correlation between white dwarf mass and $f_{\rm b}$, but thanks to the new measurements we do not conclude its existence. V3885 Sgr and V1193 Ori show flaring activity in the long-term light curve during which TESS observations were made. The corresponding PDSs show changes in shape and disappearance of $f_{\rm b}$. TT Ari and SGRt 062340.2-265715 exhibit smooth changes in the long-term optical light curve, and the corresponding TESS observations show variable $f_{\rm b}$ during these changes. $f_{\rm b}$ is higher for lower brightness, which was seen only in MV Lyr so far. |
| title | Hunt for the mHz variability in the TESS and XMM-Newton observations of nova-like cataclysmic variables |
| topic | High Energy Astrophysical Phenomena Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2510.02834 |