Cosmological Parameters From Supernovae Associated With Gamma-ray Bursts

Abstract

We report estimates of the cosmological parameters ${\Omega }_m$ and ${\Omega }_{\Lambda }$ obtained using supernovae (SNe) associated with gamma-ray bursts (GRBs) at redshifts up to 0.606. Eight high-fidelity GRB-SNe with well-sampled light curves across the peak are used. We correct their peak magnitudes for a luminosity-decline rate relation to turn them into accurate standard candles with dispersion $\sigma =0.18$ mag. We also estimate the peculiar velocity of the low-redshift host galaxy of SN 1998bw, using constrained cosmological simulations. In a flat universe, the resulting Hubble diagram leads to best-fit cosmological parameters of $({\Omega }_m,{\Omega }_{\Lambda })=(0.58_{-0.25}^{+0.22},0.42_{-0.22}^{+0.25})$. This exploratory study suggests that GRB-SNe can potentially be used as standardizable candles to high redshifts to measure distances in the universe and constrain cosmological parameters.

arXiv comment7 pages, 3 figures, Accepted for publication in ApJL

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