6 papers
Ubiquitous yet forgotten: broad absorptions in the optical spectra of low-mass X-ray binaries
D. Mata Sanchez, T. Munoz-Darias, J. Casares +2
Optical outburst spectra of low-mass X-ray binaries enable studies of extreme accretion and ejection phenomena. While some of their spectroscopic features have been analysed in det…
The orbital period and inclination of the neutron star X-ray transient MAXI J1807+132
E. A. Saavedra, T. Muñoz-Darias, M. A. P. Torres +7
The neutron star X-ray transient MAXI J1807+132 has undergone outbursts in 2017, 2019, and 2023. We conducted an -band time series photometry campaign using the Isaac Newton Tel…
Characterising the short-orbital period X-ray transient Swift J1910.2-0546
J. M. Corral-Santana, P. Rodriguez-Gil, M. A. P. Torres +13
SwiftJ1910.2-0546 is a Galactic X-ray transient discovered during a bright outburst in 2012. We use time-series optical photometry and spectroscopy to estimate the orbital period,…
A Halpha metric for identifying dormant black holes in X-ray transients
J. Casares, M. A. P. Torres, S. Navarro Umpiérrez
Dormant black holes (BHs) in X-ray transients can be identified by the presence of broad Ha emission lines from quiescent accretion discs. Unfortunately, short-period cataclysmic v…
Dynamical confirmation of a black hole in the X-ray transient Swift J1727.8-1613
D. Mata Sanchez, M. A. P. Torres, J. Casares +3
The X-ray transient Swift J1727.8-1613 ended its 10-month discovery outburst on June of 2024, when it reached an optical brightness comparable to pre-discovery magnitudes. With the…
State-dependent signatures of jets and winds in the optical and infrared spectrum of the black hole transient GX 3394
A. Ambrifi, D. Mata Sánchez, T. Muñoz-Darias +14
GX 3394 is one of the prototypical black hole X-ray transients, exhibiting recurrent outbursts that allow detailed studies of black hole accretion and ejection phenomena. In thi…