Growth-rate measurement with type-Ia supernovae using ZTF survey simulations

• Published in: arXiv.org
• Main Authors: Bastien Carreres, Bautista, Julian E, Feinstein, Fabrice, Fouchez, Dominique, Racine, Benjamin, Smith, Mathew, Amenouche, Mellissa, Aubert, Marie, Dhawan, Suhail, Ginolin, Madeleine, Goobar, Ariel, Gris, Philippe, Lacroix, Leander, Nuss, Eric, Regnault, Nicolas, Rigault, Mickael, Estelle, Robert, Rosnet, Philippe, Sommer, Kelian, Dekany, Richard, Groom, Steven L, Sravan, Niharika, Masci, Frank J, Purdum, Josiah
• Format: Paper Journal Article
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 22.06.2023
• Subjects: Curve fitting; Maximum likelihood estimation; Maximum likelihood method; Physics - Cosmology and Nongalactic Astrophysics; Relativity; Simulation; Supernovae
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.2303.01198

Measurements of the growth rate of structures at \(z < 0.1\) with peculiar velocity surveys have the potential of testing the validity of general relativity on cosmic scales. In this work, we present growth-rate measurements from realistic simulated sets of type-Ia supernovae (SNe Ia) from the Zwicky Transient Facility (ZTF). We describe our simulation methodology, the light-curve fitting and peculiar velocity estimation. Using the maximum likelihood method, we derive constraints on \(f\sigma_8\) using only ZTF SN Ia peculiar velocities. We carefully tested the method and we quantified biases due to selection effects (photometric detection, spectroscopic follow-up for typing) on several independent realizations. We simulated the equivalent of 6 years of ZTF data, and considering an unbiased spectroscopically typed sample at \(z < 0.06\), we obtained unbiased estimates of \(f\sigma_8\) with an average uncertainty of 19% precision. We also investigated the information gain in applying bias correction methods. Our results validate our framework which can be used on real ZTF data.