Kavli Affiliate: Alexander P. Ji
| First 5 Authors: Pierre N. Thibodeaux, Alexander P. Ji, William Cerny, Evan N. Kirby, Joshua D. Simon
| Summary:
The discovery of a star formed out of pair-instability supernova ejecta would
have massive implications for the Population III star initial mass function and
the existence of stars over 100 Msun, but none have yet been found. Recently,
the star LAMOST J1010+2358 was claimed to be a star that formed out of gas
enriched by a pair-instability supernova. We present a non-LTE abundance
analysis of a new high-resolution Keck/HIRES spectrum of J1010+2358. We
determined the carbon and aluminum abundances needed to definitively
distinguish between enrichment by a pair-instability and core-collapse
supernova. Our new analysis demonstrates that J1010+2358 does not have the
unique abundance pattern of a a pair-instability supernova, but was instead
enriched by the ejecta of a low mass core-collapse supernova. Thus, there are
still no known stars displaying unambiguous signatures of pair-instability
supernovae.
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