Miércoles 27 de septiembre a las 13h, en el Salón Meridiano
Título: “Follow-up of Gravitational Waves and explosive transients: Optimized strategies and prospects for novel discoveries”
Dr. Clécio R. de Bom (Centro Brasileño de Pesquisas Fisicas -CBPF- Brasil)
Resumen: Transient astrophysical phenomena has a range of interest that goes trough different fields of astrophysics and cosmology and are one of the most interesting subjects in time-domain and multi-messenger astronomy. Those fields has undergone a revolution over the past years. With the detection of an electromagnetic counterpart to the gravitational wave (GW) event GW170817 from a binary neutron stars merger, new techniques and resources to study astrophysical transients in the multi-messenger context have increased.Once in its design sensitivity, the current LIGO-Virgo-KAGRA (O4) season is expected to explore ∼7x more detections of Binary Neutron star (BNS) events than O3. EM follow-up of many O4 events should require telescopes with limited Target-of-Opportunity (ToO) availability.
We present the S-PLUS Transient Extension Program (STEP): a explosive transient survey conducted in the Southern Hemisphere using data from the Southern Photometric Local Universe Survey (S-PLUS) Main Survey. Additionally, We address the problem of optimally identifying all kilonovae. We optimize our strategy for kilonova confirmation while minimizing telescope time. For a wide range of kilonova parameters, corresponding to a fainter, redder kilonova compared to GW170817/AT2017gfo we find that the discovery probability with the DECam is ∼80% at the nominal BNS gravitational wave detection limit for O4, a ∼30% improvement compared to the O3 strategy. For AT2017gfo-like kilonova, we find ∼90% probability out to 330 Mpc.
Furthermore, as most expected events are Binary Black Holes, we explore the possibility of Standard Sirens in association with AGN flares. Our formalism requires GW localization area monitoring only without needing ToO spectra since we don’t require identifying the host of each BBH merger. Thus, a hybrid method between bright and dark sirens. We simulate O4 season and derive the expected constraints in H_0, Omega_m, and w.
Datos de conexión:
Unirse a la reunión zoom: https://us02web.zoom.us/j/89642687970
ID de reunión: 896 4268 7970
Código de acceso: 526656
A fin de reducir el uso de residuos plásticos, les solicitamos que se acerquen con sus propias tazas para el café.