10 papers
Discovery of a quasi-periodic oscillation non-harmonically related to the Type-C QPO in the hard intermedidate state of MAXI J1820+070
Pei Jin, Mariano Méndez, Federico GarcÃa +2
We present a detailed timing analysis of the transition from the hard-intermediate state (HIMS) to the soft-intermediate state (SIMS) in MAXI J1820+070 using NICER observations. Th…
An atypical X-ray variability component in the black hole candidate AT2019wey
Pengcheng Yang, Mariano Méndez, Sandeep K. Rout +5
Recent studies have revealed a notable timing feature in several black hole X-ray binaries (BHXBs) during the soft-to-hard transition at the outburst decay. Within a narrow frequen…
Black-hole X-ray binary Swift J1727.81613 shows simultaneous Type-B and Type-C quasi-periodic oscillations across the hard-intermediate and soft-intermediate states
Pei Jin, Mariano Méndez, Federico GarcÃa +2
We present a timing analysis of \textit{Insight}-HXMT observations of the black-hole X-ray binary Swift J1727.81613 across a bright soft X-ray flare on 2023 September 19 (MJD 60…
Detection of a Type-C QPO during the soft-to-hard transition in Swift J1727.8-1613
Maïmouna Brigitte, Noel Castro Segura, Federico GarcÃa +6
Timing analysis of accreting systems is key to probe the structure and dynamics around compact objects. In Black-Hole Low-Mass X-ray Binaries (BH LMXBs), the compact object accrete…
Evidence for enhanced mass transfer in the disc preceding the transition to the soft state in MAXI J1820+070
Pengcheng Yang, Guobao Zhang, David M. Russell +6
We investigate the 2018-2019 main outburst and the subsequent mini-outbursts of the black hole low-mass X-ray binary MAXI J1820+070 using optical/ultraviolet data from the Las Cumb…
Fast Transitions of X-ray Variability in the Neutron Star Low Mass X-ray Binary Cygnus X-2
Liang Zhang, Mariano Méndez, Hua Feng +12
We present a spectral-timing analysis of two NICER observations of the weakly magnetized neutron star low-mass X-ray binary Cygnus X-2. During these observations, we detect a rapid…