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

Fixed-shape fits give smaller depths in TGLC PSF flux for two of three reported TESS exocomet events

Three reported TESS exocomet events are tested with a fixed time shape for each event. The shape is fitted in GSFC-ELEANOR-LITE corrected flux, then held fixed across public flux products, nearby controls, and image pixels. For TIC 73149665 in Sector 12, TGLC aperture flux gives 7297 ppm and PSF flux gives 1118 ppm. Their paired difference is 6180 +/- 836 ppm. For TIC 143152957 in Sector 7, the depths are 4518 and 595 ppm, with a difference of 3923 +/- 811 ppm. TIC 280832588 in Sector 1 gives consistent depths of 3542 and 3609 ppm. Errors use 3-hour residual blocks and include covariance within each pair. The two positive differences persist with four tested baselines. QLP corrected-to-raw depth ratios are 0.460, 0.201, and 0.537 in TIC 280832588, 73149665, and 143152957. Image moments and 36 selected nearby catalogue IDs provide diagnostic checks. The controls include repeated and blended measurements. Known TGLC PSF amplitude bias, crowding, baseline choice, and fixed-shape error limits prevent a physical host assignment or a rejection of the candidates. No planet or exocomet is confirmed. The contribution is a measured comparison and an offline benchmark with 86 exact FITS inputs, source records, code, tables, four figures, and numerical checks.

TESS · exocomet candidates · photometry · TGLC · QLP · flux extraction · difference images · reproducible research

Admitted 6 citing publications

References

13
  1. usesdoi:10.1093/mnras/staf1298

    This paper supplies the three reported main-sequence candidate events and their approximate times. It already includes pixel and PSF tests. We add fixed-shape comparisons of other public products.

  2. A fixed shape fit gives 2714 ppm in QLP raw flux and -65 ppm in QLP spline flux for the Sector 15 dip of TIC 229790952 sci:sha256:61a96a012f90abcc1b3739dfaf5d8001362daf37d3926a224563f109008aabbe

    This related study measures raw and corrected QLP depths for a different candidate. It motivates a paired product comparison. No code or data from it are reused.

  3. doi:10.15407/knit2025.06.080

    This related search excludes TIC 280832588 because of its whole-curve flagged sample fraction. That cut does not establish the cause of the individual event.

  4. usesdoi:10.3847/1538-3881/acaaa7

    This paper describes TGLC extraction and the known PSF amplitude bias in crowded fields. This limit prevents rejection of a candidate from a small PSF coefficient alone.

  5. usesdoi:10.17909/610m-9474

    The saved TGLC target FITS files supply aperture, PSF, and calibrated flux.

  6. usesdoi:10.17909/j2yt-t417

    GSFC-ELEANOR-LITE supplies target and control flux. Target corrected flux defines each fixed time shape.

  7. usesdoi:10.3847/2515-5172/ac74c4

    This paper describes the GSFC full-frame-image light curve data set.

  8. usesdoi:10.17909/t9-r086-e880

    QLP supplies raw, corrected, and alternate-aperture target and control flux.

  9. usesdoi:10.17909/t9-wpz1-8s54

    The available TESS-SPOC target file supplies an additional flux comparison.

  10. usesdoi:10.17909/t9-4smn-dx89

    The available TASOC target file supplies an additional comparison, including negative fitted coefficients.

  11. usesdoi:10.17909/8nxx-tw70

    The available T16 files supply image-subtraction flux comparisons.

  12. usesdoi:10.1088/1538-3873/adad42

    This paper describes the T16 data product.

  13. usesdoi:10.3847/1538-3881/ab3467

    TIC positions and magnitudes from MAST queries define nearby control selection.

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