# Data sources

## TESS light curve

- File: `tess2020106103520-s0024-0000000255930614-0180-s_lc.fits`
- Archive: Mikulski Archive for Space Telescopes (MAST), TESS SPOC light-curve product
- TESS sector: 24
- TIC target ID: 255930614
- MAST observation ID: 27391623
- MAST data URI: `mast:TESS/product/tess2020106103520-s0024-0000000255930614-0180-s_lc.fits`
- Exact download URL: <https://mast.stsci.edu/api/v0.1/Download/file?uri=mast:TESS%2Fproduct%2Ftess2020106103520-s0024-0000000255930614-0180-s_lc.fits>
- Collection DOI: [10.17909/t9-nmc8-f686](https://doi.org/10.17909/t9-nmc8-f686) (TESS 2-minute light curves, all sectors; sector 24 used here)
- Retrieved: 2026-08-15
- SHA-256: `7d0343549e8d0ccb3f9f445427d75c308d01e4fba2dc0960bbbf6df7b244b037`

The FITS file is stored unmodified. The analysis reads `TIME`, `PDCSAP_FLUX`,
`PDCSAP_FLUX_ERR`, and `QUALITY`. PDCSAP flux is the SPOC light curve with common
instrumental trends removed and aperture/crowding corrections applied; this does
not make it free of residual stellar or instrumental systematics.

## System parameters

- File: `system_parameters.csv`
- Service: NASA Exoplanet Archive TAP, `pscomppars` table
- Exact query: <https://exoplanetarchive.ipac.caltech.edu/TAP/sync?query=select+pl_name%2Chostname%2Cra%2Cdec%2Cpl_orbper%2Cpl_tranmid%2Cpl_trandur%2Cpl_rade%2Cpl_bmasse%2Cpl_eqt%2Cpl_orbsmax%2Csy_dist%2Csy_tmag%2Cst_teff%2Cst_rad%2Cst_mass%2Cdisc_year%2Cdiscoverymethod%2Cdisc_refname%2Cdisc_pubdate%2Cdisc_facility+from+pscomppars+where+pl_name%3D%27HD+149026+b%27&format=csv>
- Retrieved: 2026-08-15

The saved row is the input actually used by `scripts/analyze_transit.py`; the
analysis does not query a changing live service at run time.


## Additional TESS sectors for robustness analysis

All are unmodified standard-cadence SPOC light curves from the same [MAST TESS collection](https://doi.org/10.17909/t9-nmc8-f686).

- Sector 24: `tess2020106103520-s0024-0000000255930614-0180-s_lc.fits` (1,938,240 bytes)
  - MAST URI: `mast:TESS/product/tess2020106103520-s0024-0000000255930614-0180-s_lc.fits`
  - SHA-256: `7d0343549e8d0ccb3f9f445427d75c308d01e4fba2dc0960bbbf6df7b244b037`
- Sector 52: `tess2022138205153-s0052-0000000255930614-0224-s_lc.fits` (1,791,360 bytes)
  - MAST URI: `mast:TESS/product/tess2022138205153-s0052-0000000255930614-0224-s_lc.fits`
  - SHA-256: `621a1bd00ea5ac896eff843acf215b21c18ce5c06f7d516e691d5c631cb1a3be`
- Sector 25: `tess2020133194932-s0025-0000000255930614-0182-s_lc.fits` (1,877,760 bytes)
  - MAST URI: `mast:TESS/product/tess2020133194932-s0025-0000000255930614-0182-s_lc.fits`
  - SHA-256: `1e9fbd222ad642d2ea9bd01499facd2dfc4afec75d03980b3a7ef425e143b707`