A Time-Dependent Spectral Analysis of γ Cassiopeiae

Sean J Gunderson; David P Huenemoerder; José M Torrejón; Dustin K Swarm; Joy S Nichols; Pragati Pradhan; Richard Ignace; Hans Moritz Guenther; A. M. T Pollock; Norbert S Schulz

doi:10.48550/arxiv.2411.11825

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A Time-Dependent Spectral Analysis of γ Cassiopeiae

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A Time-Dependent Spectral Analysis of γ Cassiopeiae

Sean J Gunderson, David P Huenemoerder, José M Torrejón, Dustin K Swarm, Joy S Nichols, Pragati Pradhan, Richard Ignace, Hans Moritz Guenther, A. M. T Pollock and Norbert S Schulz

ArXiv.org

Cornell University

11/18/2024

DOI: 10.48550/arxiv.2411.11825

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https://doi.org/10.48550/arxiv.2411.11825View

Preprint (Author's original)This preprint has not been evaluated by subject experts through peer review. Preprints may undergo extensive changes and/or become peer-reviewed journal articles. Open Access

Abstract

We investigated the temporal and spectral features of \gamma 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.

Physics - High Energy Astrophysical Phenomena

Physics - Solar and Stellar Astrophysics

Details

Title: Subtitle: A Time-Dependent Spectral Analysis of γ Cassiopeiae
Creators: Sean J Gunderson - Massachusetts Institute of Technology
David P Huenemoerder
José M Torrejón
Dustin K Swarm
Joy S Nichols
Pragati Pradhan
Richard Ignace
Hans Moritz Guenther - Massachusetts Institute of Technology
A. M. T Pollock
Norbert S Schulz - Massachusetts Institute of Technology
Resource Type: Preprint
Publication Details: ArXiv.org
DOI: 10.48550/arxiv.2411.11825
ISSN: 2331-8422
Publisher: Cornell University; Ithaca, New York
Language: English
Date posted: 11/18/2024
Academic Unit: Physics and Astronomy
Record Identifier: 9984936604602771

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