Dips and eclipses in the X-ray binary Swift J1858.6-0814 observed with NICER

• Autores: Buisson, D .J. K.; Altamirano, D.; Armas Padilla, M.; Arzoumanian, Z.; Bult, P.; Castro Segura, N.; Charles, P. A.; Degenaar, N.; DÍaz Trigo, M.; Van Den Eijnden, J.; Fogantini, Federico Adrián; Gandhi, P.; Gendreau, K.; Hare, J.; Homan, J.; Knigge, C.; Malacaria, C.; Mendez, M.; Muñoz Darias, T.; Özbey Arabacl, M.; Remillard, R.; Strohmayer, T. E.; Tombesi, F.; Tomsick, J. A.; Vincentelli, F.; Walton, D. J.
• Año de publicación: 2021
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: ACCRETION, ACCRETION DISCS; STARS: NEUTRON; X-RAYS: BINARIES
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

We present the discovery of eclipses in the X-ray light curves of the X-ray binary Swift J1858.6-0814. From these, we find an orbital period of $P=76841.3-{-1.4}{+1.3}$ s (≈21.3 h) and an eclipse duration of $t-{ m ec}=4098-{-18}{+17}$ s (≈1.14 h). We also find several absorption dips during the pre-eclipse phase. From the eclipse duration to orbital period ratio, the inclination of the binary orbit is constrained to i > 70°. The most likely range for the companion mass suggests that the inclination is likely to be closer to this value than 90. The eclipses are also consistent with earlier data, in which strong variability ('flares') and the long orbital period prevent clear detection of the period or eclipses. We also find that the bright flares occurred preferentially in the post-eclipse phase of the orbit, likely due to increased thickness at the disc-accretion stream interface preventing flares being visible during the pre-eclipse phase. This supports the notion that variable obscuration is responsible for the unusually strong variability in Swift J1858.6-0814.
Fil: Buisson, D .J. K.. University of Southampton; Reino Unido
Fil: Altamirano, D.. University of Southampton; Reino Unido
Fil: Armas Padilla, M.. Universidad de La Laguna; España
Fil: Arzoumanian, Z.. No especifíca;
Fil: Bult, P.. University of Maryland; Estados Unidos
Fil: Castro Segura, N.. University of Southampton; Reino Unido
Fil: Charles, P. A.. University of Southampton; Reino Unido
Fil: Degenaar, N.. No especifíca;
Fil: DÍaz Trigo, M.. No especifíca;
Fil: Van Den Eijnden, J.. University of Oxford; Reino Unido
Fil: Fogantini, Federico Adrián. Provincia de Buenos Aires. Gobernación. Comisión de Investigaciones Científicas. Instituto Argentino de Radioastronomía. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto Argentino de Radioastronomía; Argentina
Fil: Gandhi, P.. University of Southampton; Reino Unido
Fil: Gendreau, K.. University of Southampton; Reino Unido
Fil: Hare, J.. No especifíca;
Fil: Homan, J.. No especifíca;
Fil: Knigge, C.. University of Southampton; Reino Unido
Fil: Malacaria, C.. No especifíca;
Fil: Mendez, M.. No especifíca;
Fil: Muñoz Darias, T.. Universidad de La Laguna; España
Fil: Özbey Arabacl, M.. University of Southampton; Reino Unido
Fil: Remillard, R.. No especifíca;
Fil: Strohmayer, T. E.. No especifíca;
Fil: Tombesi, F.. Universita Tor Vergata; Italia. University of Maryland; Estados Unidos
Fil: Tomsick, J. A.. No especifíca;
Fil: Vincentelli, F.. University of Southampton; Reino Unido
Fil: Walton, D. J.. No especifíca;