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Post Info TOPIC: First supernovae
Blobrana


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Title: Finding the First Cosmic Explosions II: Core-Collapse Supernovae
Authors: Daniel J. Whalen, Candace C. Joggerst, Chris L. Fryer, Massimo Stiavelli, Alexander Heger, Daniel E. Holz

Understanding the properties of Pop III stars is prerequisite to elucidating the nature of primeval galaxies, the chemical enrichment and reionisation of the early IGM, and the origin of supermassive black holes. While the primordial IMF remains unknown, recent evidence from numerical simulations and stellar archaeology suggests that some Pop III stars may have had lower masses than previously thought, 15 - 50 \Ms in addition to 50 - 500 \Ms. The detection of Pop III supernovae by JWST, WFIRST or the TMT could directly probe the primordial IMF for the first time. We present numerical simulations of 15 - 40 \Ms Pop III core-collapse SNe done with the Los Alamos radiation hydrodynamics code RAGE. We find that they will be visible in the earliest galaxies out to z ~ 10 - 15, tracing their star formation rates and in some cases revealing their positions on the sky. Since the central engines of Pop III and solar-metallicity core-collapse SNe are quite similar, future detection of any Type II supernovae by next-generation NIR instruments will in general be limited to this epoch.

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Blobrana


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Title: Seeing the First Supernovae at the Edge of the Universe with JWST
Authors: Daniel J. Whalen, Chris L. Fryer, Daniel E. Holz, Alexander Heger, S. E. Woosley, Massimo Stiavelli, Wesley Even, Lucille L. Frey

The first stars ended the cosmic Dark Ages and created the first heavy elements necessary for the formation of planets and life. The properties of these stars remain uncertain, and it may be decades before individual Pop III stars are directly observed. Their masses, however, can be inferred from their supernova explosions, which may soon be found in both deep-field surveys by JWST and in all-sky surveys by WFIRST. We have performed radiation hydrodynamical simulations of the near infrared signals of Pop III pair-instability supernovae in realistic circumstellar environments with Lyman absorption by the neutral intergalactic medium. We find that JWST and WFIRST will detect these explosions out to z ~ 30 and 20, respectively, unveiling the first generation of stars in the universe.

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Blobrana


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A five-year mission to hunt for the first supernovae, or exploding stars, in the universe is to be led by a professor of astrophysics at Queen's University Belfast.
Professor Stephen Smartt will head a team of 12 international scientists who will come to Queen's to begin work on the project next month.
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