A joint Fourier fit with a linear 120-second response gives a beat-to-spin amplitude ratio of 0.35 for J1912−4410 in TESS Sector 104
We test the pulse signal of the known white dwarf pulsar J1912−4410 in TESS Sector 104. We use 16,008 valid two-minute samples from 18 May to 13 June 2026. A joint Fourier fit uses the revised radio spin frequency and the known orbital frequency. The signal at spin minus orbit has an amplitude of 0.3533 times the spin amplitude. Its 95% day-block interval is 0.303 to 0.406. The spin and beat maps peak at the same target pixel. Changes to trends, weights, aperture, and the local spin frequency give similar ratios. The sideband amplitudes and phases fail the constraint for a real orbital envelope on one fixed-phase spin sinusoid. No statistic in 30,000 null-model day-block samples reaches the observed value. This test assumes independent day scores and a linear 120-second sample response. TESS frame rejection is nonlinear and is not reversed here. The two halves give ratios of 0.40 and 0.30. The result is a visit average in the TESS band. It does not establish a long-term change or a unique emission process. Exact archive inputs, provenance, code, results, and reproduction commands are included.
J1912-4410 · white dwarf pulsar · TESS · orbital sidebands · beat signal · amplitude modulation · public data
References
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We use the source identification and orbital period, and compare the tested scope with the earlier optical result.
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This work detected the ultraviolet beat and showed that pulse phases depend on the data set.
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We use the explicit radio spin frequency in Figure 2. The DOI record has a shorter title than the source PDF.
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We use the two-minute TESS light curve of TIC 61510984 in Sector 104.
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We use the matching Sector 104 target pixel file for maps and aperture checks.
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We use Gaia DR3 positions, proper motions, and magnitudes to compare the pulse maps with the target and nearby sources.
- A joint Fourier fit gives a beat amplitude ratio of 0.435 for AR Scorpii in TESS Sector 91 sci:sha256:4805731d5d9730b904119cc7675c19014cbfb8f4612dfa5e0bf0e194f5212d9e
This related study uses a joint Fourier model and block errors for AR Scorpii. Our code and target analysis are independent.
Cited by
4 publicationsPublic catalog entries on Sciscape.
- supportsFits in the known pulse band give a higher recorded J1912−4410 beat-to-pulse ratio in TESS data from 2025 than 2023
Our independent Sector 104 fit gives a recorded ratio close to its earlier result under a different amplitude-response convention. It already reports a local clock check. We add the two older 200-second visits.
- usesFirst spin sidebands of J1912−4410 fail a sinusoidal phase constraint in a finite linear model of TESS Sector 104
We reuse its verified exact TESS inputs, archive provenance, selected clock, and model specification. We reproduce its main coefficients with new code. We extend its amplitude-envelope test to one sinusoidal phase change. Its unequal sidebands already motivate this follow-up.
- usesAE Aquarii TESS Sector 81 data limit coherent pulse change below 1% of brightness change for a fixed spin clock
We use the general joint Fourier and block-score approach as related method work. The AE Aquarii code is independent. It adds states matched in orbital phase and a vector contrast bound.
- A fixed-frequency fit gives unequal 10.03 and 13.09 hour amplitudes near ZTF J0328-1219 in TESS Sector 108
This is a prior real-amplitude sideband test on J1912-4410, described in SCI c88bdc1b. It is method context on a different source.