Work

Ultraviolet spectroscopy of the supernova Ia hypervelocity runaway white dwarf J0927−6335

Year: 2024

Type: article

Abstract: The hot white dwarf (WD) J0927−6335 (Gaia DR3 5250394728194220800 with an effective temperature of Teff = 60 000 K and a surface gravity of logg = 7) was detected as the fastest known Galactic hypervelocity star with a space velocity of ≈2800 km s−1 and an atmosphere dominated by carbon and oxygen. It is thought to be the surviving WD donor predicted by the so-called dynamically driven double-degenerate double-detonation (D6) type Ia supernova formation model. We analysed an ultraviolet spectrum of J0927−6335 that was recently obtained with the Hubble Space Telescope and found very high abundances of iron and nickel. This might originate in the pollution of the remnant by the supernova Ia explosion, but it is uncertain to which extent atomic diffusion altered the chemical composition of the accreted material.

Source: Astronomy and Astrophysics

DOI: 10.1051/0004-6361/202451635

Authors: Klaus Werner, Kareem El-Badry, Boris T. Gänsicke, Ken J. Shen

Institutions: University of Tübingen, California Institute of Technology, University of Warwick, University of California, Berkeley

Language: English

Topic: Stellar, planetary, and galactic studies

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,732

Funders: National Aeronautics and Space Administration, Space Telescope Science Institute, European Commission