Prospects of the Multi-channel Photometric Survey Telescope in the Cosmological Application of Type Ia Supernovae

• Published in: Research in astronomy and astrophysics Vol. 24; no. 4; pp. 45017 - 191
• Main Authors: Wang, Zhenyu, Zhang, Jujia, Er, Xinzhong, Bai, Jinming
• Format: Journal Article
• Language: English
• Published: Beijing National Astromonical Observatories, CAS and IOP Publishing 01.04.2024; IOP Publishing; Key Laboratory for the Structure and Evolution of Celestial Objects,Chinese Academy of Sciences,Kunming 650216,China; International Centre of Supemovae,Yunnan Key Laboratory,Kunming 650216,China%Yunnan Observatories,Chinese Academy of Sciences,Kunming 650216,China; Yunnan Observatories,Chinese Academy of Sciences,Kunming 650216,China; University of Chinese Academy of Sciences,Beijing 100049,China; International Centre of Supemovae,Yunnan Key Laboratory,Kunming 650216,China%South-Western Institute for Astronomy Research,Yunnan University,Kunming 650500,China
• Subjects: (cosmology:) cosmological parameters; (stars:) supernovae: general; Color; Cosmology; Distance measurement; Light curve; Lunar phases; Photometry; Red shift; Spectral classification; Stellar evolution; Supernovae; Telescopes; Weather; Weather conditions; (cosmology:)cosmological parameters; telescopes; (stars:)supernovae:general
• ISSN: 1674-4527; 2397-6209
• DOI: 10.1088/1674-4527/ad339f

The Multi-channel Photometric Survey Telescope (Mephisto) is a real-time, three-color photometric system designed to capture the color evolution of stars and transients accurately. This telescope system can be crucial in cosmological distance measurements of low-redshift (low- z , z ≲0.1) Type Ia supernovae (SNe Ia). To optimize the capabilities of this instrument, we perform a comprehensive simulation study before its official operation is scheduled to start. By considering the impact of atmospheric extinction, weather conditions, and the lunar phase at the observing site involving the instrumental features, we simulate light curves of SNe Ia obtained by Mephisto. The best strategy in the case of SN Ia cosmology is to take the image at an exposure time of 130 s with a cadence of 3 days. In this condition, Mephisto can obtain hundreds of high-quality SNe Ia to achieve a distance measurement better than 4.5%. Given the on-time spectral classification and monitoring of the Lijiang 2.4 m Telescope at the same observatory, Mephisto, in the whole operation, can significantly enrich the well-calibrated sample of supernovae at low- z and improve the calibration accuracy of high- z SNe Ia.