Formation of carbon-enhanced metal-poor stars in the presence of far-ultraviolet radiation

S. Bovino, T. Grassi, D. R.G. Schleicher, M. A. Latif

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Recent discoveries of carbon-enhanced metal-poor stars like SMSS J031300.36-670839.3 provide increasing observational insights into the formation conditions of the first second-generation stars in the universe, reflecting the chemical conditions after the first supernova explosion. Here, we present the first cosmological simulations with a detailed chemical network including primordial species as well as C, C+, O, O+, Si, Si +, and Si2 + following the formation of carbon-enhanced metal-poor stars. The presence of background UV flux delays the collapse from z = 21 to z = 15 and cool the gas down to the cosmic microwave background temperature for a metallicity of Z/Z = 10-3. This can potentially lead to the formation of lower-mass stars. Overall, we find that the metals have a stronger effect on the collapse than the radiation, yielding a comparable thermal structure for large variations in the radiative background. We further find that radiative backgrounds are not able to delay the collapse for Z/Z = 10-2 or a carbon abundance as in SMSS J031300.36-670839.3.

Original languageEnglish
Article numberL35
JournalAstrophysical Journal Letters
Volume790
Issue number2
DOIs
Publication statusPublished - Aug 1 2014
Externally publishedYes

Keywords

  • astrochemistry
  • cosmology: theory
  • hydrodynamics
  • methods: numerical

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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