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Simulation of CSST's astrometric capability

Liao, Shi-Long; Qi, Zhao-Xiang; Shao, Li +5 more

Introduction: The China Space Station Telescope (CSST) will enter a low Earth orbit around 2024 and operate for 10 years, with seven of those years devoted to surveying the area of the median-to-high Galactic latitude and median-to-high Ecliptic latitude of the sky. To maximize the scientific output of CSST, it is important to optimize the survey …

MORPHOFIT: An automated galaxy structural parameters fitting package

Tortorelli, Luca; Mercurio, Amata

In today's modern wide-field galaxy surveys, there is the necessity for parametric surface brightness decomposition codes characterised by accuracy, small degree of user intervention, and high degree of parallelisation. We try to address this necessity by introducing \textsc{morphofit}, a highly parallelisable \textsc{python} package for the estim…

On the nature of Tycho Brahe's supernova

Ruiz-Lapuente, Pilar

At the 450 years anniversary of its observation, the supernova named after Tycho Brahe, SN 1572, can be explained in the terms used nowadays to characterize Type Ia supernovae (SNe Ia). By assembling the records of the observations made in 1572–74 and evaluating their uncertainties, it is possible to recover the light curve and the color evolution…

Miras as a distance indicator in the CSST, JWST, and Gaia era

Sun, Yan; Zhang, Bo; Chen, Wen +5 more

Mira variables are important distance indicators owing to the clear period–luminosity relation at infrared wavelengths. We have compiled a sample of 343 Galactic Miras selected from the American Association of Variable Star Observers database and Gaia Data Release 3. We used V-band observations from the American Association of Variable Star Observ…

The ability of CSST to determine the orbital solutions of SB1s

Wang, Xiaoli; Fu, Yanning; Chen, Yue +1 more

The single-lined spectroscopic binaries (SB1s) are composed of two components with large difference in masses and in physical properties. The orbital and physical parameters of a large number of such binary systems are unknown due to lack of necessary observations. Compared with SB2s, SB1s can provide much more stringent constraint to stellar evol…