James Webb Space Telescope Feed Post

Arxiv: SN 2023adsy -- a normal Type Ia Supernova at z=2.9, discovered by JWST Published: 11/15/2024 8:50:27 PM Updated: 11/15/2024 8:50:27 PM

Paper abstract: SN 2023adsy, a Type Ia supernova discovered by JWST at z = 2.9, was found tobe a peculiar event, being extremely red and faint, but showing very similarrest-frame light curve decline rate to the majority of low-redshift SNe Ia. Inthis paper we show that the red color and faint peak magnitude could beexplained by significant reddening/extinction due to dust in the host galaxy.If host galaxy extinction is accounted for, the parameters of the best-fitlight curve templates in the SALT3-NIR model are compatible with a slowlydeclining, but still normal SN Ia. Comparison of the inferred luminositydistance with the prediction of the LambdaCDM cosmology (assuming H0 = 70km/s/Mpc and OmegaM = 0.315) on the Hubble-diagram suggests no significantevolution of the SN Ia peak luminosity at z > 2 redshifts. It is also shownthat the discovery of a single SN Ia between 2 < z < 3 within the area of theJADES survey during 1 year is consistent with the current estimates for the SNIa rates at such redshifts.