Atmosphere boundaries

Atmosphere boundaries¶

BOSZ 2025-recomputed 2024-format spectra¶

Status: verified

The recomputed BOSZ release distinguishes original-resolution Eddington first moment from lower-resolution files containing resampled flux and continuum values.

Scope¶

BOSZ files using the 2024 filename and product layout after the 2025-09-24 recomputation; legacy BOSZ 2017 uses a different normalization convention.

Conventions¶

• owner=jaxstro.spectra

• native_coordinate=wavelength_angstrom

• native_density=F_lambda_resampled

• native_unit=erg s^-1 cm^-2 angstrom^-1

• canonical_factor=10

• canonical_unit=erg s^-1 cm^-2 nm^-1

• original_resolution_conversion=F_lambda=4piH_lambda

Sources¶

• source — the product identity, native wavelength unit, flux convention, and recomputation status. Locator: 2024 Version: original-resolution columns and F=4*pi*H; lower resolutions contain flux and continuum columns; update dated 2025-09-24

• source — the original H_lambda and lower-resolution flux-product distinction. Locator: Sect. 3.3, equations and text describing original and resampled spectral products

Code & validation¶

• code: src/jaxstro/atmospheres/bosz.py::BoszBackend

• validation: tests/validation/provenance_cards/test_atmosphere_spectra_sources.py::test_newera_and_bosz_canonical_flux_conversions_are_explicit

PHOENIX NewEra V3 low-resolution spectra¶

Status: verified

The NewEra low-resolution release provides wavelength-domain surface flux spectra in Gaia-compatible SI-density units that require an explicit CGS density conversion at the Jaxstro atmosphere boundary.

Scope¶

PHOENIX-NewEraV3-LowRes-SPECTRA products only; this card does not describe the HSR/LSR HDF5 arrays or Gaia/JWST products as interchangeable artifacts.

Conventions¶

• owner=jaxstro.spectra

• native_coordinate=wavelength_nm

• native_density=F_lambda

• native_unit=W m^-2 nm^-1

• canonical_factor=1e3

• canonical_unit=erg s^-1 cm^-2 nm^-1

Sources¶

• source — the released coordinate, spectral-density meaning, and native units. Locator: Sect. 6, p. 7: low-resolution archive wavelengths and fluxes are nm and W m^-2 nm^-1; HDF5 fl is log10(F_lambda) in erg s^-1 cm^-2 cm^-1

• source — the exact V3 low-resolution product identity. Locator: Files table: PHOENIX-NewEraV3-LowRes-SPECTRA.tar.gz

Code & validation¶

• code: src/jaxstro/atmospheres/newera.py::NewEraBackend

• validation: tests/validation/provenance_cards/test_atmosphere_spectra_sources.py::test_newera_and_bosz_canonical_flux_conversions_are_explicit

Sonora Diamondback 2024 spectra¶

Status: verified

Sonora Diamondback spectra provide monochromatic top-of-atmosphere radiation flux on a wavelength axis, with units per metre even though wavelengths are tabulated in microns.

Scope¶

The Diamondback spectra archive associated with Morley et al. (2024), not Sonora Bobcat, Cholla, Elf Owl, or reduced third-party copies.

Conventions¶

• owner=jaxstro.spectra

• native_coordinate=wavelength_micron

• native_density=wavelength-density flux

• native_unit=W m^-2 m^-1

• canonical_factor=1e-6

• canonical_unit=erg s^-1 cm^-2 nm^-1

• source_deviation=printed F_nu subscript conflicts with wavelength axis and per-metre density unit

• sampling=monochromatic points; source warns against unresolved wavelength interpolation

Sources¶

• source — the coordinate, dimensional unit, surface-flux meaning, and point-sampling limitation. Locator: SPECTRA section: columns, units, F=4*pi*H statement, top-of-atmosphere meaning, and sampling warning

• source — the Diamondback family and parameter-domain identity. Locator: Morley et al. (2024), model grid and published spectra description

Code & validation¶

• code: src/jaxstro/atmospheres/sonora.py::SonoraBackend

• validation: tests/validation/provenance_cards/test_atmosphere_spectra_sources.py::test_sonora_source_inconsistency_and_conversion_are_explicit

TLUSTY BSTAR2006 spectral energy distributions¶

Status: verified

BSTAR2006 SED files tabulate frequency and surface Eddington flux H_nu; a physical surface flux requires the documented 4*pi factor before conversion from F_nu to canonical F_lambda.

Scope¶

BSTAR2006 full SED flux archives for the controlled vturb=2 and vturb=10 C/N products, not detailed UV/optical wavelength-domain spectra.

Conventions¶

• owner=jaxstro.spectra

• native_coordinate=frequency_hz

• native_density=H_nu

• native_unit=erg s^-1 cm^-2 Hz^-1

• canonical_factor=4*pi then F_nu-to-F_lambda

Sources¶

• source — frequency, surface H_nu units, and product identities. Locator: Spectral Energy Distributions: two-column archive format and vturb product table

• source — the Eddington-to-surface-flux conversion and C/N product meaning. Locator: Lanz & Hubeny (2007), grid description and footnote 6: stellar-surface flux F_nu=4*pi*H_nu

Code & validation¶

• code: src/jaxstro/atmospheres/tlusty.py::TlustyBackend

• validation: tests/validation/provenance_cards/test_atmosphere_spectra_sources.py::test_tlusty_eddington_flux_conversion_is_explicit

TLUSTY OSTAR2002 spectral energy distributions¶

Status: verified

OSTAR2002 SED files tabulate frequency and surface Eddington flux H_nu; a physical surface flux requires the documented 4*pi factor before conversion from F_nu to canonical F_lambda.

Scope¶

OSTAR2002 full SED flux archives, not the separately published detailed UV or optical wavelength-domain products.

Conventions¶

• owner=jaxstro.spectra

• native_coordinate=frequency_hz

• native_density=H_nu

• native_unit=erg s^-1 cm^-2 Hz^-1

• canonical_factor=4*pi then F_nu-to-F_lambda

Sources¶

• source — frequency and surface H_nu column units. Locator: Spectral Energy Distributions: two-column archive format

• source — the Eddington-to-surface-flux conversion. Locator: Lanz & Hubeny (2003), Sect. 6 and footnote 6: stellar-surface flux F_nu=4*pi*H_nu

Code & validation¶

• code: src/jaxstro/atmospheres/tlusty.py::TlustyBackend

• validation: tests/validation/provenance_cards/test_atmosphere_spectra_sources.py::test_tlusty_eddington_flux_conversion_is_explicit