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Probing jet launching in neutron star X-ray binaries: the variable and polarized jet of SAX J1808.4-3658
M. C. Baglio, D. M. Russell, S. Crespi +16
We report on an optical photometric and polarimetric campaign on the accreting millisecond X-ray pulsar (AMXP) SAX J1808.4-3658 during its 2019 outburst. The emergence of a low-fre…
Optical spectroscopy of 4U 1812-12: an ultra-compact X-ray binary seen through an H II region
M. Armas Padilla, T. Muñoz-Darias, F. Jiménez-Ibarra +6
The persistent, low-luminosity neutron star X-ray binary 4U 1812-12 is a potential member of the scarce family of ultra-compact systems. We performed deep photometric and spectrosc…
Near-infrared emission lines trace the state-independent accretion disc wind of the black hole transient MAXI J1820+070
Javier Sánchez-Sierras, Teo Muñoz-Darias
The black hole transient MAXI J1820+070 displayed optical P-Cyg profiles and other wind-related emission line features during the hard state of its discovery outburst. We present n…
A NICER look at the state transitions of the black hole candidate MAXI J1535-571 during its reflares
V. A. Cúneo, K. Alabarta, L. Zhang +18
The black hole candidate and X-ray binary MAXI J1535-571 was discovered in September 2017. During the decay of its discovery outburst, and before returning to quiescence, the sourc…
Discovery of optical outflows and inflows in the black hole candidate GRS 1716-249
V. A. Cúneo, T. Muñoz-Darias, J. Sánchez-Sierras +12
We present optical spectroscopy obtained with the GTC, VLT and SALT telescopes during the decline of the 2016-2017 outburst of the black hole candidate GRS 1716-249 (Nova Oph 1993)…
The variable radio counterpart of Swift J1858.6-0814
J. van den Eijnden, N. Degenaar, T. D. Russell +18
Swift J1858.6-0814 is a transient neutron star X-ray binary discovered in October 2018. Multi-wavelength follow-up observations across the electromagnetic spectrum revealed many in…