Holger Stiele (NTHU); Albert Kong (NTHU)
We present the results of our spectral and timing studies with NICER of the recently detected black hole X-ray binaries MAXI J0637–430 and MAXI J1631–479 that show peculiar behaviour during their outbursts. Both these sources are first observed in the high-soft state and followed by NICER to the low-hard state or quiescence state, respectively. MAXI J0637–430 shows unusually little variability in the high-soft state. MAXI J1631–479 remains unusually soft during the entire outburst, even in the low-hard state, when type-C QPOs are detected and seems to start the transition to the quiescence state at a rather high count rate. We will discuss these systems and their properties in relation to canonical black hole X-ray binaries.