A pixel mask fixed over one JWST visit retains positive infrared color contrasts in two BD+05 4868 Ab cores
We test two local infrared color contrasts in one JWST MIRI visit of BD+05 4868 Ab. We test if these contrasts depend on changes in the valid detector pixels. We keep a pixel only if it is valid in all 48,850 integrations. This mask retains 141 wavelength rows. We test five source widths and four background choices. All 20 extractions with background subtraction give positive local 10–12 minus 8–10 micrometre contrasts in both selected cores. The ranges are 951–2,446 ppm and 1,147–1,368 ppm. The nominal 12-column extraction gives 1,346 ± 132 ppm and 1,204 ± 86 ppm. The errors describe conditional short residual scatter. The first core changes substantially with background choice. Equal fractional row weights also give positive results for all 20 extractions. We omit each retained row once from the nominal calculation. Each omission leaves a positive result in each core. The remaining ranges are 1,313–1,377 ppm and 1,171–1,258 ppm. No single retained row drives either nominal result. This study extends earlier image tests with the same pixels at every time and a wider source range. These tests share one detector calibration. They do not identify a physical cause or dust composition. We provide code, minute arrays, exact public input versions and hashes, figures, and reproduction instructions.
BD+05 4868 Ab · JWST · MIRI · disintegrating planet · infrared spectra · fixed pixel mask · background subtraction · spectral extraction · reproducible research
References
7- usesTwo BD+05 4868 Ab transit cores show excess 10–12 μm local depression in JWST pipeline 3.0.0 spectra sci:sha256:69a7c784fe62ea5d7caabced52e8bc5541683eb231173ec246488c6590ac9ef4
We reuse its minute spectra as the pipeline reference. We also use its ephemeris, phase windows and conditional error convention.
- supportsNine fixed image extractions give positive infrared color contrasts in two BD+05 4868 Ab cores sci:sha256:6c65f65580972053f13a6db4a37a9ccc3f5a71221a8fc4b93f3bb88c95d137cb
Positive contrasts persist with a pixel mask fixed over the full visit and a wider source grid. The first core remains sensitive to background choice. The masks and data scope differ.
- supportsSeparate fixed backgrounds raise one control color contrast in an October 2025 BD+05 4868 Ab MIRI visit sci:sha256:42d9a77cab73f1ce460f30dcd27cc65543d93f3c8bcdbce40cc95cb53dbfae18
Our fixed-pixel test supports its positive core contrasts and background sensitivity. This prior study already provides full-visit image spectra and control tests. We do not repeat its control analysis.
- usesdoi:10.3847/2041-8213/adbf21
The discovery paper supplies the known planet, the period and epoch, and context for its long dust transits and stellar companion.
- doi:10.1051/0004-6361/202347127
This work describes MIRI detector response and persistence. It does not identify the cause of the contrasts in our visit.
- doi:10.1038/s41550-024-02230-x
This work reports MIRI response changes and problems at some long wavelengths in another visit. These effects limit physical interpretation here.
- usesdoi:10.1051/0004-6361/202243940
We use preserved Gaia DR3 astrometry for an approximate projection of the known companion. The projection omits distortion and does not separate the stellar spectra.
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