Increased Lyα Opacity in White Dwarf Photospheres from Transient H− Resonances

Gomez, Thomas A.; Zammit, Mark Christian; White, Jackson Richard; Stambulchik, Evgeny; Hubeny, Ivan; Bray, Igor; Fontes, Christopher John; Montgomery, Michael H.; Dunlap, Bart H.; Winget, Donald E.

doi:10.3847/1538-4357/adc9ae

Increased Lyα Opacity in White Dwarf Photospheres from Transient H⁻ Resonances

Journal Article · Thu Jun 05 00:00:00 EDT 2025 · The Astrophysical Journal

DOI:https://doi.org/10.3847/1538-4357/adc9ae· OSTI ID:2575595

^[1]; ^[2]; ^[3]; ^[4]; Hubeny, Ivan ^[5]; ^[6]; ^[2]; ^[7]; Dunlap, Bart H. ^[7]; ^[7]

Univ. of Colorado, Boulder, CO (United States); Univ. of Texas, Austin, TX (United States)
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Univ. of Texas, Austin, TX (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Weizmann Institute of Science, Rehovot (Israel)
Univ. of Arizona, Tucson, AZ (United States)
Curtin Univ., Perth, WA (Australia)
Univ. of Texas, Austin, TX (United States)

The structure and emergent flux of hydrogen atmosphere white dwarfs depend on the opacity of the Lyα and Lyβ spectral lines. The opacity here is set by the strength and broadening of these lines; the latter is dictated by the far line wing, which is in the “quasi-static” limit of electron broadening, placing it in the incomplete collision regime, and describes the transient parts of electron and ion collisions. These transient stages of the collision form resonances: In the case of ions, they manifest as molecular resonances, while for electrons they are H⁻ resonances, both of which can only be captured quantum-mechanically. Quantum-mechanical calculations have historically preserved only a handful of broadening terms that are most important near the center of the line. However, in the wings of the line, the previously neglected terms that describe the transient stages of the collision need to be included. This requirement arises because, in the line wings, the broadening from the 1s ground state, which is generally assumed to be extremely small compared to the broadening of the upper state, is no longer negligible within a quantum-mechanical model that takes into account exchange interactions. The inclusion of all the transient terms results in asymmetries and extra broadening. The increased broadening of Lyα increases the opacity at the energy where most of the flux leaves the star. The broader Lyα lines also impact the visible flux, raising it by an amount that exceeds previously estimated errors.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: 89233218CNA000001; NA0003960; NA0004149; SC0010623

OSTI ID:: 2575595

Report Number(s):: LA-UR--25-21088; 1538-4357; 10.3847/1538-4357/adc9ae

Journal Information:: The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 1 Vol. 986; ISSN 0004-637X; ISSN 1538-4357

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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