Carbon from massive binary-stripped stars over cosmic time: effect of metallicity

Abstract

The origin of carbon in the Universe remains uncertain. At solar metallicity, binary-stripped massive stars -- stars that lost their envelope through stable interaction with a companion -- have been suggested to produce twice as much carbon as their single-star counterparts. However, understanding the chemical evolution of galaxies over cosmic time requires examining stellar yields across a range of metallicities. Using the stellar evolution code MESA, we compute the carbon yields from wind mass loss and supernova explosions of single and binary-stripped stars across a wide range of initial masses ($10$-$46,M_{\odot }$), metallicities ($Z=0.0021$, $0.0047$, $0.0142$), and initial orbital periods ($10$-$5000$ days). We find that metallicity is the dominant factor influencing the carbon yields of massive stars, outweighing the effects of binarity and detailed orbital parameters. Since the chemical yields from binary massive stars are highly sensitive to metallicity, we caution that yields predicted at solar metallicity should not be directly extrapolated to lower metallicities. At sub-solar metallicities, particularly below $1/7$ solar, weak stellar winds and inefficient binary stripping result in carbon yields from binary-stripped stars that closely resemble those of single stars. This suggests that binary-stripped massive stars are unlikely to explain the presence of carbon-enhanced metal-poor stars or the carbon enrichment observed in high-redshift galaxies as probed by the James Webb Space Telescope. Our findings only concern the stripped stars in massive binaries. The impact of other outcomes of binary star evolution, in particular stellar mergers and accretors, remains largely unexplored but will be necessary for a full understanding of the role of massive binaries in nucleosynthesis.

14 pages, 8 figures. Submitted to A&A. Comments welcome!

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