A Time-Dependent Spectral Analysis of $γ$ Cassiopeiae
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arXiv
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| Format: | Preprint |
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2024
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| author | Gunderson, Sean J. Huenemoerder, David P. Torrejón, José M. Swarm, Dustin K. Nichols, Joy S. Pradhan, Pragati Ignace, Richard Guenther, Hans Moritz Pollock, A. M. T. Schulz, Norbert S. |
| author_facet | Gunderson, Sean J. Huenemoerder, David P. Torrejón, José M. Swarm, Dustin K. Nichols, Joy S. Pradhan, Pragati Ignace, Richard Guenther, Hans Moritz Pollock, A. M. T. Schulz, Norbert S. |
| contents | We investigated the temporal and spectral features of $γ$ Cassiopeiae's X-ray emission within the context of the white dwarf accretion hypothesis. We find that the variabilities present in the X-ray data show two different signals, one primarily due to absorption and the other due to flickering like in non-magnetic cataclysmic variables. We then use this two-component insight to investigate previously un-reported simultaneous XMM and NuSTAR data. The model fitting results find white dwarf properties consistent with optical studies alongside a significant secondary, thermal source. We propose a secondary shock between the Be decretion disk and white dwarf accretion disk as the source. Finally, we analyzed a unique, low-count rate event of the XMM light curve as potential evidence for the white dwarf encountering Be decretion disk structures. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2411_11825 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A Time-Dependent Spectral Analysis of $γ$ Cassiopeiae Gunderson, Sean J. Huenemoerder, David P. Torrejón, José M. Swarm, Dustin K. Nichols, Joy S. Pradhan, Pragati Ignace, Richard Guenther, Hans Moritz Pollock, A. M. T. Schulz, Norbert S. High Energy Astrophysical Phenomena Solar and Stellar Astrophysics We investigated the temporal and spectral features of $γ$ Cassiopeiae's X-ray emission within the context of the white dwarf accretion hypothesis. We find that the variabilities present in the X-ray data show two different signals, one primarily due to absorption and the other due to flickering like in non-magnetic cataclysmic variables. We then use this two-component insight to investigate previously un-reported simultaneous XMM and NuSTAR data. The model fitting results find white dwarf properties consistent with optical studies alongside a significant secondary, thermal source. We propose a secondary shock between the Be decretion disk and white dwarf accretion disk as the source. Finally, we analyzed a unique, low-count rate event of the XMM light curve as potential evidence for the white dwarf encountering Be decretion disk structures. |
| title | A Time-Dependent Spectral Analysis of $γ$ Cassiopeiae |
| topic | High Energy Astrophysical Phenomena Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2411.11825 |