A comparison between short GRB afterglows and kilonova AT2017gfo: shedding light on kilonovae properties

Multimessenger astronomy received a great boost following the discovery of kilonova (KN) AT2017gfo, the optical counterpart of the gravitational wave source GW170817 associated with the short gamma-ray burst GRB 170817A. AT2017gfo was the first KN that could be extensively monitored in time using bo...

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Detalles Bibliográficos
Autores: Rossi, A., Stratta, G., Maiorano, E., Spighi, D., Masetti, N., Palazzi, E., Gardini, Angela, Melandri, A., Nicastro, L., Pian, E., Branchesi, Marica, Dadina, M., Testa, V., Brocato, S., Benetti, S., Ciolfi, Riccardo, Covino, Stefano, D'Elia, V., Grado, A., Izzo, L., Perego, A., Piranomonte, S., Salvaterra, Ruben, Selsing, J., Tomasella, L., Yang, S., Vergani, D., Amati, L., Stephen, J. B.
Tipo de recurso: artículo
Estado:Versión publicada
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:10261/211147
Acceso en línea:http://hdl.handle.net/10261/211147
Access Level:acceso abierto
Palabra clave:Gravitational waves
Gamma-ray burst: general
Gamma ray bursts
Neutron star mergers
stars: magnetars
Descripción
Sumario:Multimessenger astronomy received a great boost following the discovery of kilonova (KN) AT2017gfo, the optical counterpart of the gravitational wave source GW170817 associated with the short gamma-ray burst GRB 170817A. AT2017gfo was the first KN that could be extensively monitored in time using both photometry and spectroscopy. Previously, only few candidates have been observed against the glare of short GRB afterglows. In this work, we aim to search the fingerprints of AT2017gfo-like KN emissions in the optical/NIR light curves of 39 short GRBs with known redshift. For the first time, our results allow us to study separately the range of luminosity of the blue and red components of AT2017gfo-like kilonovae in short GRBs. In particular, the red component is similar in luminosity to AT2017gfo, while the blue KN can be more than 10 times brighter. Finally, we exclude a KN as luminous as AT2017gfo in GRBs 050509B and 061201.C 2020 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

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