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astro-ph.SR · Solar and Stellar Astrophysicsastro-ph.EP · Earth and Planetary Astrophysicsastro-ph.IM · Instrumentation and Methods for Astrophysics

A fixed-frequency fit gives unequal 10.03 and 13.09 hour amplitudes near ZTF J0328-1219 in TESS Sector 108

A real sinusoidal amplitude envelope predicts equal amplitudes at the two first sidebands of a fixed-phase carrier. We test this necessary condition near the debris-transit white dwarf ZTF J0328-1219. A joint fit to 3,311 TESS Sector 108 ten-minute means uses the previously selected 11.3604-hour carrier and 10.0324-hour upper term. The required mirror period is 13.0936167 hours. The measured sine semi-amplitudes are 0.73552 and 0.05438 electron/s. Forcing equality, with phases free, increases residual sum of squares by 386.550 (electron/s) squared. Every one of 20 planned fit checks gives a larger upper amplitude. Under a fitted-null two-day block sign procedure, 18 of all 16,384 patterns reach this discrepancy. Shifting the origin by one day gives 10 of 32,768. The partial Sector 109 record gives 8 of 64 at the primary origin, so it is not strong confirmation. These diagnostics assume adequate fixed models and independent, sign-symmetric noise blocks. Full enumeration is not an exact test of general stellar noise. The frequencies were selected from some of the same photons in prior work. The result disfavors one simple sinusoidal amplitude envelope within the tested fit. It does not exclude changes in both amplitude and phase, identify a unique source, establish a second orbit, or show a new planet. The package preserves unchanged public FITS data, source records, code, figures, all trial results, independent numerical audits, and a fresh offline reproduction.

white dwarfs · planetary debris · ZTF J0328-1219 · TESS · amplitude modulation · sideband symmetry · constrained least squares · reproducible astronomy

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References

15
  1. usesTESS Sector 108 maps show similar pixel patterns at 10.03 and 11.36 hours near ZTF J0328−1219 sci:sha256:427665b9d7619914fc014affd4a9009324b39570b70a3d4f9b69e9aa57cc452f

    We reuse its unchanged Sector 108 TESSCut file, coordinate facts, and source-map context. We test a different amplitude constraint with new code.

  2. usesA fixed 10.03 hour term reduces block prediction error near ZTF J0328-1219 in TESS Sectors 108 and 109 with selected spline smoothing sci:sha256:e8542db4ecd0d5a1bb77e460fb12015e897d417f0b622ef876eec7b3b19aa3cb

    We reuse its newer Sector 109 FITS file. It supplies prediction context and already states that two sinusoids can be represented by changes in amplitude and phase.

  3. uses2026 TESS data show an 11.36-hour signal near ZTF J0328−1219 sci:sha256:98c40ca0b30611804544dd841a78a78ace20930290ca6a8f97883d18af4cabf8

    This work supplies the selected primary period pair and sky method. The frequencies use some of the same photons and are not independently selected here.

  4. usesTESS data from September–October 2026 show an 11.36-hour signal near ZTF J0328−1219 sci:sha256:0ed15c387809e04b02e193580f23bc8158c2657ced5c517ee643f47ae8f737db

    This work supplies published alternative period values used in sensitivity checks.

  5. usesThe fitted 11.36 hour signal is stronger than the 10 hour signal at ZTF J0328-1219 in TESS sector 108 sci:sha256:a7024e03acbf0449f41450c30dc223ee33cc01cc9a24b4522537ac6d17a5ee1b

    This prior measurement supplies an alternative period pair and shows that the longer pattern is stronger in these data.

  6. 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 sci:sha256:e6d4b5b9b545c71f306f8098b437173f9028c71a7709fc5b4ea84803f05e046d

    This is a prior real-amplitude sideband test on J1912-4410, described in SCI c88bdc1b. It is method context on a different source.

  7. First spin sidebands of J1912−4410 fail a sinusoidal phase constraint in a finite linear model of TESS Sector 104 sci:sha256:4724224b6f6d48c602db74a49d2bf7ad497d07d3954f517e531b6ee9b7d6baba

    This prior constraint study gives related sideband and fitted-null sign methods. We use its stated caution that full sign enumeration is not an exact general noise test.

  8. usesdoi:10.17909/v1jf-9f09

    Public TESS Sector 108 calibrated images are the primary source data.

  9. usesdoi:10.17909/k8d1-8a04

    The partial public TESS Sector 109 release is a descriptive extension.

  10. usesdoi:10.1051/0004-6361/202243940

    Gaia DR3 coordinate and proper-motion facts from the source SCI study set the aperture centre.

  11. doi:10.3847/1538-4357/ac0822
  12. doi:10.1093/mnras/stae750
  13. doi:10.3847/2515-5172/ae9e29
  14. doi:10.1111/j.1365-2966.2012.20654.x
  15. doi:10.1117/1.JATIS.1.1.014003

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