JWST Legacy Archival Program Enabling Robust Stellar Context for Exoplanet Spectroscopy
Eyes on the Stars is a JWST archival research program focused on extracting and standardizing time-series spectroscopy products that help disentangle stellar and planetary signals in transmission spectra. The program emphasizes reproducible reductions, consistent assumptions across targets, and intentional consideration of stellar contamination as an astrophysical systematic to deliver products designed for downstream atmospheric inference.
Grant: JWST AR 5370 • Last updated: —
Stellar photospheres are not uniform. Spots, faculae, and other forms of heterogeneity can imprint wavelength-dependent signals that bias inferred planetary radii, spectral slopes, and molecular abundances. This is especially important for active K and M dwarfs and for the high-precision spectra enabled by JWST.
Eyes on the Stars provides uniform data products and stellar-contamination constraints that support robust interpretation of JWST transmission spectra and facilitate comparisons across targets, instruments, and observing modes.
Quantify the impact of unocculted and occulted photospheric heterogeneity on transmission spectra and provide products designed for atmospheric retrieval workflows.
Apply consistent reduction and modeling assumptions across a broad set of JWST time-series observations, enabling population-level and cross-instrument analyses.
Deliver curated products and documentation that make it easier to incorporate stellar context into JWST-era atmospheric characterization.
Eyes on the Stars analyzes 37 JWST time-series visits spanning 17 planetary systems and 267.6 hours of observations with NIRISS/SOSS and NIRSpec/PRISM.
Together, these observations comprise the archival dataset analyzed by JWST AR 5370.
| Target | Spectral Type | Instrument / Mode | Visits | Duration | JWST Programs |
|---|---|---|---|---|---|
| WASP-189 | A6V | NIRISS/SOSS | 1 | 13.2 hr | 3279 |
| HAT-P-14 | F3V | NIRISS/SOSS | 1 | 7.1 hr | 1541 |
| WASP-17 | F5V | NIRISS/SOSS | 1 | 12.7 hr | 1353 |
| HAT-P-1 | F9V | NIRISS/SOSS | 1 | 8.4 hr | 1201 |
| Kepler-51 | G2V | NIRSpec/PRISM | 1 | 15.0 hr | 2454 |
| WASP-96 | G7V | NIRISS/SOSS | 1 | 7.5 hr | 2734 |
| WASP-39 | G9V | NIRISS/SOSS; NIRSpec/PRISM | 2 | 21.2 hr | 1366 |
| WASP-52 | K2V | NIRISS/SOSS | 1 | 6.1 hr | 1201 |
| HAT-P-18 | K3V | NIRISS/SOSS | 1 | 8.2 hr | 2734 |
| HAT-P-12 | K4V | NIRISS/SOSS | 1 | 8.3 hr | 1281 |
| HATS-72 | K4V | NIRISS/SOSS | 1 | 8.3 hr | 2594 |
| WASP-107 | K6V | NIRISS/SOSS | 1 | 8.3 hr | 1201 |
| K2-18 | M2.5V | NIRISS/SOSS | 1 | 6.9 hr | 2722 |
| L 98-59 | M3V | NIRISS/SOSS | 1 | 5.0 hr | 1201 |
| TOI-5205 | M3.5V | NIRSpec/PRISM | 3 | 20.5 hr | 3171 |
| LP 791-18 | M5.5V | NIRSpec/PRISM | 1 | 5.2 hr | 1201 |
| TRAPPIST-1 | M8V | NIRISS/SOSS; NIRSpec/PRISM | 18 | 105.8 hr | 1201 1331 1981 2420 2589 |
This target list reflects the observations included in JWST AR 5370 and may be updated as the program develops.