Optical follow-up of the neutron star–black hole mergers S200105ae and S200115j

LIGO and Virgo’s third observing run revealed the first neutron star–black hole (NSBH) merger candidates in gravitational waves. These events are predicted to synthesize r-process elements creating optical/near-infrared ‘kilonova’ emission. The joint gravitational wave and electromagnetic detection...

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Detalles Bibliográficos
Autores: Anand, Shreya, Coughlin, Michael W., Kasliwal, Mansi M., Bulla, Mattia, Ahumada, Tomás, Sagués Carracedo, Ana, Almualla, Mouza, Andreoni, Igor, Stein, Robert, Foucart, Francois, Singer, Leo P., Sollerman, Jesper, Bellm, Eric C., Bolin, Bryce, Caballero-García, María Dolores, Castro-Tirado, Alberto J., Cenko, S. Bradley, De, Kishalay, Dekany, Richard G., Duev, Dmitry A., Feeney, Michael, Fremling, Christoffer, Goldstein, Daniel A., Golkhou, V. Zach, Graham, Matthew J., Guessoum, Nidhal, Hankins, Matthew J., Hu, Youdong, Kong, Albert K. H., Kool, Erik C., Kulkarni, S. R., Kumar, Harsh, Laher, Russ R., Masci, Frank J., Mróz, Przemek, Nissanke, Samaya, Porter, Michael, Reusch, Simeon, Riddle, Reed, Rosnet, Philippe, Rusholme, Ben, Serabyn, Eugene, Sánchez Ramírez, Rubén, Rigault, Mickael, Shupe, David L., Smith, Roger, Soumagnac, Maayane T., Walters, Richard, Valeev, Azamat F.
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2020
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/266331
Acceso en línea:http://hdl.handle.net/10261/266331
Access Level:acceso abierto
Palabra clave:ddc:520
Descripción
Sumario:LIGO and Virgo’s third observing run revealed the first neutron star–black hole (NSBH) merger candidates in gravitational waves. These events are predicted to synthesize r-process elements creating optical/near-infrared ‘kilonova’ emission. The joint gravitational wave and electromagnetic detection of an NSBH merger could be used to constrain the equation of state of dense nuclear matter, and independently measure the local expansion rate of the Universe. Here, we present the optical follow-up and analysis of two of the only three high-significance NSBH merger candidates detected to date, S200105ae and S200115j, with the Zwicky Transient Facility. The Zwicky Transient Facility observed ~48% of S200105ae and ~22% of S200115j’s localization probabilities, with observations sensitive to kilonovae brighter than −17.5 mag fading at 0.5 mag d in the g- and r-bands; extensive searches and systematic follow-up of candidates did not yield a viable counterpart. We present state-of-the-art kilonova models tailored to NSBH systems that place constraints on the ejecta properties of these NSBH mergers. We show that with observed depths of apparent magnitude ~22 mag, attainable in metre-class, wide-field-of-view survey instruments, strong constraints on ejecta mass are possible, with the potential to rule out low mass ratios, high black hole spins and large neutron star radii. © 2020, The Author(s), under exclusive licence to Springer Nature Limited.

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