Environmental Dependence of Type Ia Supernova Luminosities from the YONSEI Supernova Catalog
Young-Lo Kim (1, 2), Yijung Kang (2), and Young-Wook Lee (2) ((1), CNRS/IN2P3/IPNL, (2) Yonsei University)

TL;DR
This study constructs a comprehensive SN Ia catalog to investigate how their luminosities depend on host galaxy environments, revealing significant differences linked to stellar mass and star formation activity, which may influence cosmological measurements.
Contribution
The paper introduces the YONSEI SN catalog and demonstrates environmental effects on SN Ia luminosities using multiple light-curve fitters and host galaxy data.
Findings
SNe Ia are fainter in low-mass, star-forming hosts by ~0.06 mag.
Luminosity differences increase when considering local environments.
Environmental dependence likely stems from luminosity evolution with redshift.
Abstract
There is growing evidence for the dependence of Type Ia supernova (SN Ia) luminosities on their environments. While the impact of this trend on estimating cosmological parameters is widely acknowledged, the origin of this correlation is still under debate. In order to explore this problem, we first construct the YONSEI (YOnsei Nearby Supernova Evolution Investigation) SN catalog. The catalog consists of 1231 spectroscopically confirmed SNe Ia over a wide redshift range (0.01 < z < 1.37) from various SN surveys and includes the light-curve fit data from two independent light-curve fitters of SALT2 and MLCS2k2. For a sample of 674 host galaxies, we use the stellar mass and the star formation rate data in Kim et al. (2018). We find that SNe Ia in low-mass and star-forming host galaxies are mag and mag fainter than those in high-mass and passive hosts, after…
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.
Taxonomy
TopicsGamma-ray bursts and supernovae · Astrophysics and Cosmic Phenomena · Galaxies: Formation, Evolution, Phenomena
