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

NEOWISE flux shows a signal at the fixed 1.790-hour optical period of WDJ000747.61+195124.94

We test public NEOWISE fluxes of WDJ000747.61+195124.94 at a fixed frequency from an earlier optical study. We use 275 W1 and 267 W2 measurements in 22 visits from December 2013 to July 2024. A fit with separate visit offsets gives semi-amplitudes of 7.23% and 16.29% of the median accepted calibrated band flux. Approximate 95% intervals from visit clusters are 5.41 to 9.06% and 12.06 to 20.51%. Both cosine coefficients are positive near optical maximum. Exact visit sign tests give one-sided probabilities of 2.38e-7 and 4.77e-7. These tests assume independent visits and sign-symmetric visit errors for the fixed sampling and errors. Stricter cuts, visit slopes, and comparison-star corrections retain the signal. A nearby alias also gives a strong infrared fit. Thus, NEOWISE does not select a unique frequency. Catalog selection and incomplete exposure coverage remain limits. The result adds time-dependent infrared evidence to the known optical signal and infrared excess. It does not establish a planet or a unique physical cause. The package preserves the archive responses, provenance, code, figures, results, and an independent numerical check.

white dwarfs · NEOWISE · WDJ000747.61+195124.94 · infrared variability · fixed-frequency test · visit sign test · infrared excess · frequency aliases · reproducible photometry

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References

6
  1. usesTESS 2-min search of 307 Gaia white dwarfs (G < 18, Part 1) finds no new transit candidates, recovers WD 1856+534 b, and finds a 1.790 h red-amplitude period in WDJ000747.61+195124.94 sci:sha256:43aefaa615b2d24dd1da87a22649f83c69ba7c59cf99a5af46effa8355413687

    We use its full-precision optical frequency and maximum for a separate test with NEOWISE fluxes. The infrared data show a signal at this fixed frequency. They do not select a unique frequency or confirm the proposed companion.

  2. supportsdoi:10.3847/1538-4357/ac1354

    This paper reports the infrared excess of GaiaJ0007+1951 and a possible cool companion. Our epoch-flux test adds infrared variability at the fixed optical frequency. It does not determine the companion type.

  3. doi:10.3847/1538-4357/ae4fb5

    This infrared-excess study includes the same Gaia DR3 source. It gives prior context for the target.

  4. usesdoi:10.1088/0004-637X/792/1/30

    We use public single-exposure fluxes from the NEOWISE Reactivation mission.

  5. usesdoi:10.1088/0004-6256/140/6/1868

    WISE mission and W1 and W2 instrument context. We use the AllWISE catalog to select controls.

  6. usesdoi:10.1051/0004-6361/202243940

    Gaia DR3 gives the source identity, position, and proper motion for target selection.

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