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Carreres, Bastien; Bautista, Julian E.; Feinstein, Fabrice; Fouchez, Dominique; Racine, Benjamin; Smith, Mathew; Amenouche, Melissa; Aubert, Marie; Dhawan, Suhail; Ginolin, Madeleine; Goobar, Ariel; Gris, Philippe; Lacroix, Leander; Nuss, Eric; Regnault, Nicolas; Rigault, Mickael; Robert, Estelle; Rosnet, Philippe; Sommer, Kelian; Dekany, Richard; Groom, Steven L.; Sravan, Niharika; Masci, Frank J.; Purdum, Josiah
Astronomy and astrophysics (Berlin), 06/2023, Volume: 674Journal Article
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 derived constraints on fσ 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 fσ 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.
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