A joint Fourier fit gives a beat amplitude ratio of 0.435 for AR Scorpii in TESS Sector 91
We measure the beat pulse pattern of AR Scorpii in TESS Sector 91. A joint Fourier fit uses 71,167 samples with 20-second spacing and zero quality flags. The model includes spin, beat, and orbital terms. It integrates the signal over each live frame. The beat fundamental to double-beat semi-amplitude ratio is 0.435. Its conditional 95% interval is 0.420 to 0.450, from 19 day blocks. The fitted beat component does not have half-cycle symmetry. Baseline, frequency set, quality, PDC flux, and pixel controls test the result. An instantaneous-sample model gives 0.505, which shows the effect of exposure averaging. The two visit halves give ratios of 0.411 and 0.454. The main value describes the average for the retained samples under the stated model. The package contains the source light curve, a pixel extraction, code, and numerical checks. This measurement uses the TESS band. It does not establish a change from earlier ground-based data or detect precession.
AR Scorpii · TESS Sector 91 · white dwarf pulsar · beat pulses · finite exposure · Fourier model · public data
References
5- usesdoi:10.17909/t9-st5g-3177
The primary input is the public SPOC 20-second light curve of TIC 50098516 in Sector 91.
- usesdoi:10.17909/t9-tcn7-7g94
The public 20-second target pixels supply aperture sums and recorded cosmic-ray corrections.
- usesdoi:10.1093/mnras/stac2391
The constrained timing solution sets the spin and beat clocks. The paper also used a joint Fourier model.
- doi:10.3847/2041-8213/ad0be7
The reported pulse change through 2023 motivates a later measurement. We also calculate its H2=0.30 diagnostic, with limits on comparison.
- doi:10.1038/nature18620
This paper established the white dwarf pulsar nature of AR Scorpii.
Cited by
6 publicationsPublic catalog entries on Sciscape.
- Fits in the known pulse band give a higher recorded J1912−4410 beat-to-pulse ratio in TESS data from 2025 than 2023
This related AR Scorpii study uses a joint Fourier fit and block errors. No source code was copied.
- usesA fixed waveform fit to TESS Sector 91 agrees with the known decrease in AR Scorpii spin frequency
We use its source identification and joint Fourier model context. Its fixed-orbit frequency sensitivity check is prior work. We fit two clock parameters and their joint error with new code.
- usesAn independent day model gives approximate limits below 0.15 electron/s for four beat harmonic differences in matched AR Scorpii TESS Sector 91 data with zero quality flags
We use its Fourier clock convention and day-score method. We add paired comparisons with simultaneous 120-second data.
- usesSeparate day fits give a 10.6% larger late beat harmonic ratio for AR Scorpii in TESS Sector 91
This prior study identified the source and measured the average and half-visit amplitude ratios. We extend its descriptive time comparison with day-level errors and relative-phase tests.
- usesThe 2025 TESS beat frequency of AR Scorpii is below its 2017 reference in joint Fourier fits
We use the same public source light curve and the joint Fourier design. That study already reports a point clock shift. We add frequency errors, model and noise controls, and average derivatives.
- 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
This related study uses a joint Fourier model and block errors for AR Scorpii. Our code and target analysis are independent.