Spectroscopy of the Supernova H0pe Host Galaxy at Redshift 1.78

Abstract

Supernova (SN) H0pe was discovered as a new transient in James Webb Space Telescope (JWST) NIRCam images of the galaxy cluster PLCK G165.7+67.0 taken as part of the "Prime Extragalactic Areas for Reionization and Lensing Science" (PEARLS) JWST GTO program (# 1176) on 2023 March 30 (AstroNote 2023-96; Frye et al. 2023). The transient is a compact source associated with a background galaxy that is stretched and triply-imaged by the cluster's strong gravitational lensing. This paper reports spectra in the 950-1370 nm observer frame of two of the galaxy's images obtained with Large Binocular Telescope (LBT) Utility Camera in the Infrared (LUCI) in longslit mode two weeks after the \JWST\ observations. The individual average spectra show the [OII] doublet and the Balmer and 4000 Angstrom breaks at redshift z=1.783+/-0.002. The CIGALE best-fit model of the spectral energy distribution indicates that SN H0pe's host galaxy is massive (Mstar~6x10^10 Msun after correcting for a magnification factor ~7) with a predominant intermediate age (~2 Gyr) stellar population, moderate extinction, and a magnification-corrected star formation rate ~13 Msun/yr, consistent with being below the main sequence of star formation. These properties suggest that H0pe might be a type Ia SN. Additional observations of SN H0pe and its host recently carried out with JWST (JWST-DD-4446; PI: B. Frye) will be able to both determine the SN classification and confirm its association with the galaxy analyzed in this work.

6 pages, 4 figures, Letter accepted for publication in Astronomy & Astrophysics

References in corpus (15)

• The James Webb Space Telescope
• A Highly Consistent Framework for the Evolution of the Star-Forming "Main Sequence" from z~0-6
• Rates and properties of type Ia supernovae as a function of mass and star-formation in their host galaxies
• The Art of Measuring Physical Parameters in Galaxies: A Critical Assessment of Spectral Energy Distribution Fitting Techniques
• JWST's PEARLS: Prime Extragalactic Areas for Reionization and Lensing Science: Project Overview and First Results
• JWST/NIRCam Probes Young Star Clusters in the Reionization Era Sunrise Arc
• The systematics of strong lens modeling quantified: the effects of constraint selection and redshift information on magnification, mass, and multiple image predictability
• JWST Imaging of Earendel, the Extremely Magnified Star at Redshift $z=6.2$
• Two lensed star candidates at $z\simeq 4.8$ behind the galaxy cluster MACS J0647.7+7015
• JWST's PEARLS: a new lens model for ACT-CL J0102$-$4915, "EL Gordo'', and the first red supergiant star at cosmological distances discovered by JWST
• HST grism spectroscopy of z~3 massive quiescent galaxies: Approaching the metamorphosis
• The Magnificent Five Images of Supernova Refsdal: Time Delay and Magnification Measurements
• SIPGI: an interactive pipeline for spectroscopic data reduction
• See Change: VLT spectroscopy of a sample of high-redshift Type Ia supernova host galaxies
• The restframe ultraviolet of superluminous supernovae -- I. Potential as cosmological probes

Cited by in corpus (7)

• Strong gravitational lensing and microlensing of supernovae
• JWST Photometric Time-Delay and Magnification Measurements for the Triply-Imaged Type Ia "Supernova H0pe" at z = 1.78
• HOLISMOKES -- XII. Time-delay Measurements of Strongly Lensed Type Ia Supernovae using a Long Short-Term Memory Network
• GausSN: Bayesian Time-Delay Estimation for Strongly Lensed Supernovae
• HOLISMOKES XV. Search for strong gravitational lenses combining ground-based and space-based imaging
• Testing Lens Models of PLCK G165.7+67.0 Using Lensed SN H0pe
• Detection of Unresolved Strongly Lensed Supernovae with 7-Dimensional Telescope