A Possible Extremely Fast Spinning White Dwarf in the Intermediate Polar SDSS J0932+47

Jordan Tweddale; Peter Garnavich; Mark R. Kennedy

doi:10.3847/2515-5172/ad2f34

A Possible Extremely Fast Spinning White Dwarf in the Intermediate Polar SDSS J0932+47

Jordan Tweddale
, Peter Garnavich
, Mark R. Kennedy

School of Physics

University of Notre Dame

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A Possible Extremely Fast Spinning White Dwarf in the Intermediate Polar SDSS J0932+47
Jordan Tweddale, Peter Garnavich, and Mark R. Kennedy

Published March 2024 • © 2024. The Author(s). Published by the American Astronomical Society.
Research Notes of the AAS, Volume 8, Number 3
Citation Jordan Tweddale et al 2024 Res. Notes AAS 8 66
DOI 10.3847/2515-5172/ad2f34

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Abstract
We analyze the far-ultraviolet light curve of the intermediate polar (IP) candidate SDSS-J093249.57+472523.0 (J0932+47), as observed by Hubble Space Telescope/Cosmic Origins Spectrograph. The power spectrum displays two periodicities at frequencies of 2.01 and 0.462 cycles minute−1, corresponding to periods of 29.8 and 130 s. We estimate the significance of the 29.8 s peak to be 3σ. The detection of the 130 s signal is less secure. If the 29.8 s signal is generated by a rotating white dwarf (WD), then J0932+47 would possess one of the fastest spinning WDs among known IPs. The N v/C iv and Si iv/C iv line ratios are larger than typically seen in cataclysmic variables (CVs), and anomalous line ratios are seen in several CVs with rapidly rotating WDs. Alternatively, the periodicities are in the range typical of dwarf nova oscillations.

Original language	English
Pages (from-to)	66
Journal	Research Notes of the AAS
Volume	8
Issue number	3
DOIs	https://doi.org/10.3847/2515-5172/ad2f34
Publication status	Published - 5 Mar 2024

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title = "A Possible Extremely Fast Spinning White Dwarf in the Intermediate Polar SDSS J0932+47",

abstract = " The American Astronomical Society, find out more. The following article isOpen access A Possible Extremely Fast Spinning White Dwarf in the Intermediate Polar SDSS J0932+47 Jordan Tweddale, Peter Garnavich, and Mark R. Kennedy Published March 2024 • {\textcopyright} 2024. The Author(s). Published by the American Astronomical Society. Research Notes of the AAS, Volume 8, Number 3 Citation Jordan Tweddale et al 2024 Res. Notes AAS 8 66 DOI 10.3847/2515-5172/ad2f34 Authors Figures References Article data Article metrics 611 Total downloads 22 total citations on Dimensions. Share this article Article information Abstract We analyze the far-ultraviolet light curve of the intermediate polar (IP) candidate SDSS-J093249.57+472523.0 (J0932+47), as observed by Hubble Space Telescope/Cosmic Origins Spectrograph. The power spectrum displays two periodicities at frequencies of 2.01 and 0.462 cycles minute−1, corresponding to periods of 29.8 and 130 s. We estimate the significance of the 29.8 s peak to be 3σ. The detection of the 130 s signal is less secure. If the 29.8 s signal is generated by a rotating white dwarf (WD), then J0932+47 would possess one of the fastest spinning WDs among known IPs. The N v/C iv and Si iv/C iv line ratios are larger than typically seen in cataclysmic variables (CVs), and anomalous line ratios are seen in several CVs with rapidly rotating WDs. Alternatively, the periodicities are in the range typical of dwarf nova oscillations.",

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N2 - The American Astronomical Society, find out more. The following article isOpen access A Possible Extremely Fast Spinning White Dwarf in the Intermediate Polar SDSS J0932+47 Jordan Tweddale, Peter Garnavich, and Mark R. Kennedy Published March 2024 • © 2024. The Author(s). Published by the American Astronomical Society. Research Notes of the AAS, Volume 8, Number 3 Citation Jordan Tweddale et al 2024 Res. Notes AAS 8 66 DOI 10.3847/2515-5172/ad2f34 Authors Figures References Article data Article metrics 611 Total downloads 22 total citations on Dimensions. Share this article Article information Abstract We analyze the far-ultraviolet light curve of the intermediate polar (IP) candidate SDSS-J093249.57+472523.0 (J0932+47), as observed by Hubble Space Telescope/Cosmic Origins Spectrograph. The power spectrum displays two periodicities at frequencies of 2.01 and 0.462 cycles minute−1, corresponding to periods of 29.8 and 130 s. We estimate the significance of the 29.8 s peak to be 3σ. The detection of the 130 s signal is less secure. If the 29.8 s signal is generated by a rotating white dwarf (WD), then J0932+47 would possess one of the fastest spinning WDs among known IPs. The N v/C iv and Si iv/C iv line ratios are larger than typically seen in cataclysmic variables (CVs), and anomalous line ratios are seen in several CVs with rapidly rotating WDs. Alternatively, the periodicities are in the range typical of dwarf nova oscillations.

AB - The American Astronomical Society, find out more. The following article isOpen access A Possible Extremely Fast Spinning White Dwarf in the Intermediate Polar SDSS J0932+47 Jordan Tweddale, Peter Garnavich, and Mark R. Kennedy Published March 2024 • © 2024. The Author(s). Published by the American Astronomical Society. Research Notes of the AAS, Volume 8, Number 3 Citation Jordan Tweddale et al 2024 Res. Notes AAS 8 66 DOI 10.3847/2515-5172/ad2f34 Authors Figures References Article data Article metrics 611 Total downloads 22 total citations on Dimensions. Share this article Article information Abstract We analyze the far-ultraviolet light curve of the intermediate polar (IP) candidate SDSS-J093249.57+472523.0 (J0932+47), as observed by Hubble Space Telescope/Cosmic Origins Spectrograph. The power spectrum displays two periodicities at frequencies of 2.01 and 0.462 cycles minute−1, corresponding to periods of 29.8 and 130 s. We estimate the significance of the 29.8 s peak to be 3σ. The detection of the 130 s signal is less secure. If the 29.8 s signal is generated by a rotating white dwarf (WD), then J0932+47 would possess one of the fastest spinning WDs among known IPs. The N v/C iv and Si iv/C iv line ratios are larger than typically seen in cataclysmic variables (CVs), and anomalous line ratios are seen in several CVs with rapidly rotating WDs. Alternatively, the periodicities are in the range typical of dwarf nova oscillations.

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A Possible Extremely Fast Spinning White Dwarf in the Intermediate Polar SDSS J0932+47

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