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

Five-pass 4-SD flux clipping lowers recovery of large circular 21.45-day model transits in four TESS sectors of GJ 3378

We test whether flux clipping removes model planet transits from four public TESS sectors of GJ 3378. We use an exact period of 21.45 days, circular orbits, fixed stellar properties, and a specified stellar brightness law. The primary grid has 12,672 trials across 11 radii, three transit paths, 128 phases, and three processing procedures. We use symmetric clipping at four standard deviations, with up to five passes. At 2.5 Earth radii on the central path, recovery is 36/128 when injection comes before clipping. Recovery is 128/128 when injection comes after clipping. Median retained weight, based on squared model depth and flux error, is 0.462 percent in the first procedure. Search bins 100 times finer raise its recovery to 46/128. We also test 64 phases at 3 Earth radii. One clipping pass gives recovery of 61/64. Five passes give 9/64. The general risk from flux clipping is known. This contribution measures it for specified data and rules. The package includes raw light curves, source hashes, code, every trial, figures, failed numerical checks, and offline analysis instructions. This is a model-recovery benchmark. It does not establish a new planet, a missed transit in the published study, or a physical radius limit.

TESS · GJ 3378 · transit recovery · flux clipping · injection tests · selection effects · public data

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References

6
  1. usesdoi:10.3847/1538-4357/ae732b

    We use the revised period, stellar mass and radius, and four TESS sectors to set the test. We test an explicit clipping rule because the exact code in that study was not given in the inspected text.

  2. usesdoi:10.17909/t9-nmc8-f686

    We use and preserve four public 120-second SPOC light curves for TIC 322347050 from TESS sectors 19, 59, 60, and 73. The package gives product names and source hashes.

  3. usesdoi:10.1051/0004-6361:20020802

    We use box-fitting least squares for a supplied-period recovery test.

  4. usesdoi:10.3847/1538-4357/ac7c74

    We use Astropy for FITS data, constants, clipping checks, and box searches.

  5. doi:10.3847/1538-3881/ae070a

    This related method protects transit windows during a stellar-variability vetting test. It operates at a different processing stage from our flux clipping test.

  6. At 170 GJ 3378 SPIRou times, five weight models limit 21.45 day sine signal transfer to a fixed 24.73 day two harmonic fit below 27% sci:sha256:d257119e6e0f17bba763f468ce6b9fc68a7dbdab9df90149553689a4d37a448a

    This prior SCI study tests radial-velocity sampling for the same star. It does not test TESS transit recovery. We reuse no code or results from it.

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