Science and Exploration

Forecast of Cosmological Constraints with Type Ia Supernovae from the Chinese Space Station Telescope

By Keith Cowing
Press Release
October 12, 2022
Filed under , , , ,
Forecast of Cosmological Constraints with Type Ia Supernovae from the Chinese Space Station Telescope
Chinese Space Station Telescope (CSST)
China Daily

The 2-m aperture Chinese Space Station Telescope (CSST), which observes at wavelengths ranging from 255 to 1000 nm, is expected to start science operations in 2024.

An ultra-deep field observation program covering approximately 10 square degrees is proposed with supernovae (SNe) and other transients as one of its primary science drivers. This paper presents the simulated detection results of type Ia supernovae (SNe Ia) and explores the impact of new datasets on the determinations of cosmological parameters.

The simulated observations are conducted with an exposure time of 150 s and cadences of 10, 20, and 30 days. The survey mode covering a total of 80 observations but with a random cadence in the range of 4 to 14 days is also explored. Our simulation results indicate that the CSST can detect up to ∼1800 SNe Ia at z < 1.3. The simulated SNe Ia are then used to constrain the cosmological parameters.

The constraint on Ωm can be improved by 37.5% using the 10-day cadence sample in comparison with the Pantheon sample. A deeper measurement simulation with a 300 s exposure time together with the Pantheon sample improves the current constraints on Ωm by 58.3% and ω by 47.7%. Taking future ground-based SNe Ia surveys into consideration, the constraints on ω can be improved by 59.1%. The CSST ultra-deep field observation program is expected to discover large amounts of SNe Ia over a broad redshift span and enhance our understanding of the nature of dark energy.

Shi-Yu Li, Yun-Long Li, Tianmeng Zhang, Jozsef Vinko, Eniko Regos, Xiaofeng Wang, Gaobo Xi, Hu Zhan

Comments: 10 pages, 6 figures, 2 tables, accepted for publication in SCIENCE CHINA Physics, Mechanics & Astronomy
Subjects: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
Cite as: arXiv:2210.05450 [astro-ph.CO] (or arXiv:2210.05450v1 [astro-ph.CO] for this version)
Submission history
From: Yun-Long Li
[v1] Tue, 11 Oct 2022 13:47:24 UTC (2,151 KB)

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