期刊
ASTROPHYSICAL JOURNAL
卷 876, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.3847/1538-4357/ab14e7
关键词
Galaxy: halo; stars: abundances; stars: individual (HE 1327-2326); stars: Population II; stars: Population III; supernovae: general
资金
- STScI [HST-GO-14151]
- NASA [NAS 5-26555]
- JINA-CEE - National Science Foundation [PHY-1430152]
- NSF-CAREER grant [AST-1255160]
- NSF [AST-1613536, AST-1815403]
We present observational evidence that an aspherical supernova explosion could have occurred in the first stars in the early universe. Our results are based on the first determination of a Zn abundance in a Hubble Space Telescope/Cosmic Origins Spectrograph high-resolution UV spectrum of a hyper-metal-poor (HMP) star, HE 1327-2326, with [Fe/H](NLTE) = -5.2. We determine [Zn/Fe] = 0.80. +/-. 0.25 from a UV Zn I line at 2138 angstrom, detected at 3.4 sigma. Yields of a 25M(circle dot) aspherical supernova model with artificially modified densities exploding with E = 5 x 10(51) erg best match the entire abundance pattern of HE 1327-2326. Such high-entropy hypernova explosions are expected to produce bipolar outflows, which could facilitate the external enrichment of small neighboring galaxies. This has already been predicted by theoretical studies of the earliest star-forming minihalos. Such a scenario would have significant implications for the chemical enrichment across the early universe, as HMP carbon-enhanced metal-poor (CEMP) stars such as HE 1327-2326 might have formed in such externally enriched environments.
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