A 3.114-hour WASP-132 b mask narrows the c interval in 2022 HARPS pairs with fixed orbit shapes and independent Gaussian errors

We test how a shorter WASP-132 b transit mask changes a velocity fit for planet c. We use the public CDS table of 48 HARPS observations from 2022. We replace an 11.04-hour symmetric b mask with a prior 3.114-hour duration. We keep the source c mask and ephemerides. Four HARPS points return. They add two usable pairs from the same night, increasing the pair count from 12 to 14. Exact velocity differences remove a separate constant for each night. We fix the orbit shapes and fit signed b and c amplitudes. With independent Gaussian pair errors and one unknown common variance scale, the c coefficient changes from 6.12 to 4.89 m/s. Its conditional 95% Student-t interval changes from [1.32, 10.92] to [1.57, 8.21] m/s. The width decreases by 30.74%. The fitted coefficient correlation decreases from 0.471 to 0.012. With the b amplitude fixed, the c change is only -0.076 m/s. The two added pairs do not conflict with the long-mask fit under this model. A 30-minute margin around b preserves both added pairs. A common margin around both planets gives a 29.75% width reduction. A model with an extra common drift within each night gives a c interval of [-1.67, 10.81] m/s. Thus, the inference depends on the behavior assumed within a night. This work measures a conditional data-selection effect. It does not revise the planet mass or claim a new planet. We preserve raw data, source values, selection ledgers, code, figures, independent numerical checks, and offline reproduction instructions.

WASP-132 · HARPS · radial velocity · transit mask · nightly offsets · exoplanet mass · data selection · reproducible astronomy