报告摘要： 

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In the era of modern all-sky surveys, the number of transients is increasing at an exponential rate. However, an emerging category shows absolute magnitudes intermediate between Core-Collapse Supernovae (CC SNe) and classical Novae (i.e., -15them as giant eruptions of massive stars (including luminous blue variables; LBVs), intermediate luminosity red transients (ILRTs), and luminous red novae (LRNe). ILRTs show Type IIP/L-like light curves and Type IIn-like spectra. The progenitor analysis suggests that ILRT precursors are moderately massive (8-15Msun), embedded in dusty cocoons. LRNe usually display double-peaked light curves and their spectra experience a metamorphosis evolution. The observation of Galactic LRN V1309 Sco provides unequivocal proofs of the final merging event. To date, ILRTs and LRNe are often merely understood phenomenologically rather than based on physical nature. In my talk, I will present the recent results from our observational campaign of luminous red nova AT 2021biy as well as a brief overview of the current observational results on ILRTs and LRNe. 

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