Evidence for an Aspherical Population III Supernova Explosion Inferred from the Hyper-metal-poor Star HE 1327–2326
Name
Ezzeddine_2019_ApJ_876_97.pdf
Description
Published version
Size
1.18 MB
Format
Adobe PDF
Checksum (MD5)
71f93592faabfa43f40ea5308608718c
Author(s)
Ezzeddine, Rana
Frebel, Anna L.
Date Issued
May 2019
Journal
Astrophysical Journal
Publisher
American Astronomical Society
Citation
Ezzeddine, Rana et al. “Evidence for an Aspherical Population III Supernova Explosion Inferred from the Hyper-metal-poor Star HE 1327–2326.” Astrophysical Journal, 876, 2 (May 2019): 97 © 2019 The Author(s)
Version
Final published version
Abstract
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 . We determine [Zn/Fe] = 0.80 ±; 0.25 from a UV Zn i line at 2138 detected at 3.4σ. Yields of a 25 M o aspherical supernova model with artificially modified densities exploding with E = 5 × 1051 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Terms of Use
Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.3847/1538-4357/AB14E7
