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

DOI: 
10.1093/mnras/staa479
Publication date: 
01/02/2020
Main author: 
Rossi, A.
IAA authors: 
Gardini, A.;Izzo, L.
Authors: 
Rossi, A.;Stratta, G.;Maiorano, E.;Spighi, D.;Masetti, N.;Palazzi, E.;Gardini, A.;Melandri, A.;Nicastro, L.;Pian, E.;Branchesi, M.;Dadina, M.;Testa, V.;Brocato, S.;Benetti, S.;Ciolfi, R.;Covino, S.;D'Elia, V.;Grado, A.;Izzo, L.;Perego, A.;Piranomonte, S.;Salvaterra, R.;Selsing, J.;Tomasella, L.;Yang, S.;Vergani, D.;Amati, L.;Stephen, J. B.
Journal: 
Monthly Notices of the Royal Astronomical Society
Refereed: 
Yes
Publication type: 
Article
Pages: 
3379.0-3397.0
Abstract: 
Multi-messenger astronomy received a great boost following the discovery of kilonova AT2017gfo, the optical counterpart of the gravitational wave source GW170817 associated with the short gamma-ray burst GRB 170817A. AT2017gfo was the first kilonova 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 kilonova 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 kilonova can be more than 10 times brighter. Finally, we exclude a kilonova as luminous as AT2017gfo in GRBs 050509B and 061201.
Database: 
ADS
SCOPUS
URL: 
https://ui.adsabs.harvard.edu/#abs/2020MNRAS.493.3379R/abstract
ADS Bibcode: 
2020MNRAS.493.3379R
Keywords: 
gamma-ray burst: general;gravitational waves;stars: neutron