The Donor of the Black Hole X-Ray Binary MAXI J1820+070
We estimate the parameters of the donor of the accreting black hole binary MAXI J1820+070. The measured values of the binary period, rotational and radial...
X-Ray and Optical Polarization Aligned with the Radio Jet Ejecta in GX 339–4
We present the first X-ray polarization measurements of GX 339–4. IXPE observed this source twice during its 2023–2024 outburst, once in the soft-intermediate...
