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Discovery of Spin-pulse Correlated Magnetic Gating Bursts in the Long-period Intermediate Polar PBC J0801.2-4625
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DOI：10.3847/1538-4357/ae657d.png)
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Abstract
En 中文
We present the first discovery of small-amplitude (tens of millimagnitudes), short-duration (several hours) episodic brightenings in the Transiting Exoplanet Survey Satellite (TESS) light curve of the intermediate polar PBC J0801.2-4625 that are strongly correlated with the white dwarf spin. Specifically, during the bursts, the spin period remains unchanged, while the pulse amplitude increases markedly in a highly asymmetric manner, with only the pulse maximum being enhanced by a factor of similar to 2. Essentially, the bursts are a mere amplification of the spin modulation and lack the characteristic morphology of a typical burst. These events reach peak luminosities of order 1031 erg s-1 and release total energies of similar to 1037 erg. The observed burst properties, including the durations and energy scales involved, favor magnetically gated accretion as their likely origin. Using the condition for magnetic gating instability, we infer a magnetic field of about 2.6 MG, consistent with the intermediate polar nature of the source. Furthermore, based on our TESS timing analysis, we confirm the previously reported orbital period and refine it to 11.8099210(65) hr. The orbital phase curve is dominated by ellipsoidal modulation from the secondary and exhibits a time-variable morphology. Additionally, the previously reported spin period of similar to 1307.5 s is confirmed and found to vary modestly from sector to sector.
Keywords:
TESS LIGHT CURVES
CATACLYSMIC VARIABLES
GATED ACCRETION
DWARF NOVAE
ASTROPY
IDENTIFICATION
BINARIES
PACKAGE
PROJECT
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5.4
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32.0W
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