2017/07/31 by David Rubin, D. Rubin, B. Hayden +68 · 29 citations
Physics and Astronomy · #Astronomy and Astrophysical Research #Galaxies: Formation, Evolution, Phenomena #Galaxy #Gamma-ray bursts and supernovae #Gravitational lens #Light curve #Photometric redshift #Photometry (optics) #Redshift #Spitzer Space Telescope #Strong gravitational lensing #Supernova #astro-ph.CO #astro-ph.GA
paper · pdf · doi:10.3847/1538-4357/aad565
published in The Astrophysical Journal 866(1), 65 (IOP Publishing) · Accepted for publication in ApJ
openalex created_date 2017/07/31 · arxiv created 2018/05/01 · openalex publication_date 2018/10/10 · arxiv updated 2018/10/24 · openalex updated_date 2026/08/05
Abstract We present the discovery and measurements of a gravitationally lensed supernova (SN) behind the galaxy cluster MOO J1014+0038. Based on multi-band Hubble Space Telescope and Very Large Telescope (VLT) photometry of the supernova, and VLT spectroscopy of the host galaxy, we find a 97.5% probability that this SN is a SN Ia, and a 2.5% chance of a CC SN. Our typing algorithm combines the shape and color of the light curve with the expected rates of each SN type in the host galaxy. With a redshift of 2.2216, this is the highest redshift SN Ia discovered with a spectroscopic host-galaxy redshift. A further distinguishing feature is that the lensing cluster, at redshift 1.23, is the most distant to date to have an amplified SN. The SN lies in the middle of the color and light-curve shape distributions found at lower redshift, disfavoring strong evolution to z = 2.22. We estimate an amplification due to gravitational lensing of (1.10 ± 0.23 mag)—compatible with the value estimated from the weak-lensing-derived mass and the mass–concentration relation from ΛCDM simulations—making it the most amplified SN Ia discovered behind a galaxy cluster.