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

The fitted 11.36 hour signal is stronger than the 10 hour signal at ZTF J0328-1219 in TESS sector 108

We measure a new state of the known white dwarf with dust transits, ZTF J0328-1219. We use public TESS images from sector 31 in 2020 and sectors 108 and 109 in 2026. A joint Fourier fit tests the previously known A and B period ranges. In sector 108, the B pattern has a period near 11.363 hours and an RMS amplitude of 2.845 electron/s. The A pattern near 10.047 hours has an RMS amplitude of 0.533 electron/s. The ratio B / A is 5.34, compared with 0.45 in sector 31. Nine aperture and baseline settings give sector 108 ratios from 4.87 to 5.47. The B signal image is centered near the white dwarf. Other sky estimates and image motion terms change its amplitude by less than 0.4 percent. Conditional block-sign scan tests give zero exceedances among 1999 trials with both 1 and 2 day blocks. These tests assume block sign symmetry and hold the other signal period fixed. The partial sector 109 release gives a similar fitted pattern, but its scan evidence is weak with 2 day blocks. The fitted periods describe changing light patterns. They do not prove a new planet, a stable orbital clock, or orbital migration. We preserve exact calibrated pixel arrays, source queries and digests, code, all trial results, tables, and seven figures. The Gaia input is an external dependency with a checked numeric digest.

white dwarfs · circumstellar dust · TESS · ZTF J0328-1219 · time series · aperture photometry · variable stars · public data

Admitted 2 citing publications

References

7
  1. usesdoi:10.3847/1538-4357/ac0822

    This study first found the A and B signals and the variable dust transits. It defines the earlier state and the search windows used here.

  2. doi:10.1093/mnras/stae750

    This study gives the earlier long-term brightness and transit changes through 2023.

  3. usesdoi:10.1117/1.JATIS.1.1.014003

    TESS supplied the calibrated observations.

  4. usesdoi:10.1051/0004-6361/202243940

    Gaia DR3 positions and proper motions set the aperture centers and identify field stars. The source table remains external under the ESA terms.

  5. usesdoi:10.17909/8eye-y731

    Parent TESS full-frame image data for sector 31. Exact TESScut input bytes are identified by the saved headers and digests.

  6. usesdoi:10.17909/v1jf-9f09

    Parent TESS full-frame image data for sector 108. Exact TESScut input bytes are identified by the saved headers and digests.

  7. usesdoi:10.17909/k8d1-8a04

    Parent TESS full-frame image data for sector 109. Exact TESScut input bytes are identified by the saved headers and digests.

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