Three is the magic number -- distance measurement of NGC 3147 using SN 2021hpr and its siblings
Barnabas Barna, Andrea P. Nagy, Zsofia Bora, Donat R. Czavalinga, Reka, Konyves-Toth, Tamas Szalai, Peter Szekely, Szanna Zsiros, Dominik Banhidi,, Barna I. Biro, Istvan Csanyi, Levente Kriskovics, Andras Pal, Zsofia M., Szabo, Robert Szakats, Krisztian Vida, Zsofia Bodola

TL;DR
This study uses multiple Type Ia supernovae in NGC 3147 to refine distance measurements and compare light curve fitting methods, confirming the galaxy's distance and SN properties with high accuracy.
Contribution
It provides a detailed comparison of light curve fitting algorithms and refines the distance to NGC 3147 using three supernovae, including new physical property estimates for SN 2021hpr.
Findings
Mean distance to NGC 3147 is 42.5 Mpc.
SN 2021hpr is a Branch-normal Type Ia supernova.
Consistent distance estimates across different fitting methods.
Abstract
The nearby spiral galaxy NGC 3147 hosted three Type Ia supernovae (SNe Ia) in the past decades, which have been subjects of intense follow-up observations. Simultaneous analysis of their data provides a unique opportunity for testing the different light curve fitting methods and distance estimations. The detailed optical follow-up of SN 2021hpr allows us to revise the previous distance estimations to NGC 3147, and compare the widely used light curve fitting algorithms to each other. After the combination of the available and newly published data of SN 2021hpr, its physical properties can be also estimated with higher accuracy. We present and analyse new BVgriz and Swift photometry of SN 2021hpr to constrain its general physical properties. Together with its siblings, SNe 1997bq and 2008fv, we cross-compare the individual distance estimates of these three SNe given by the SALT code, and…
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
