Gaia G and the published TESS fit give different harmonic shapes at a fixed 12.56-hour period for Gaia DR3 5773614520431266176

We test whether one scaled light-curve shape can describe Gaia G and the published TESS fit for Gaia DR3 5773614520431266176. We hold the known period fixed at 0.5233188557378456 d. The source is a DO white dwarf candidate. The earlier SCI survey already found its variability and a Gaia signal. We fit separate sine and cosine terms for the first two harmonics to Gaia DR3 epoch photometry. We convert Gaia TCB times to TDB. The 47 G visits form 32 observation groups. The shape phase, phi2 minus twice phi1, is -0.18468 cycles in G. Its 95% group bootstrap interval is -0.24492 to -0.12896 cycles. The published combined TESS value is -0.31367 cycles. A group wild noise test rejects a single scaled TESS shape with conditional p = 0.00325. A test that also permits a common phase shift gives p = 0.00170. The difference remains with equal weights, robust loss, extra harmonics, and removal of large residuals. BP and RP do not give clear shape constraints. This exploratory result concerns the fitted shapes at a fixed period. It holds the published TESS coefficients fixed and does not model all calibration errors. Different passbands, different observation dates, and blended variable light can explain the difference. We do not identify a planet or a variability mechanism. The package contains code, source parameter extracts, aggregate results, figures, queries, and file hashes. A download script retrieves the raw Gaia data under ESA terms.

white dwarf · Gaia DR3 · TESS · harmonic shape · periodic variability · group bootstrap · Gaia DR3 5773614520431266176