Conveners
Explosive Events Associated with Compact-Object Binary Mergers: Block 1
- Jorge Armando Rueda Hernandez (ICRANet)
- Krzysztof Belczynski ()
Explosive Events Associated with Compact-Object Binary Mergers: Block 2
- Krzysztof Belczynski ()
- Jorge Armando Rueda Hernandez (ICRANet)
Description
Double compact object mergers involve the densest objects in Universe; neutron stars (NS) and black holes (BH). Their electromagnetic (EM) radiation is routinely observed in short gamma-ray bursts, in the X-rays, as well as in the optical/IR via their associated kilonovas. Recently, BH-BH/BH-NS/NS-NS mergers are also routinely detected in gravitational-waves by LIGO/Virgo.
This session will be dedicated to any phenomena that may produce observable, either EM or non-EM, signals to merging (in any configurations) neutron stars and black holes. Along standard mechanisms (like ones operating in short gamma-ray bursts or kilonovas), we encourage discussion of other challenging and/or exotic proposals for detection of these sources by other not-yet-considered means, including possible future observational missions able to detect them.
Additional related questions are encouraged to be discussed in this session. Do BH-BH mergers produce any EM counterparts? Is this population of BH-BH merging binaries compatible with our previously gained astrophysical knowledge? Are BH-NS mergers expected to be accompanied by kilonovas? Have we observed any BH-NS merger in short gamma-ray bursts? Do we have any chance to detect neutrinos from NS-NS/BH-NS mergers? What are formation sites of compact object merging binaries?
I will discuss two less-discussed, yet physically-motivated channels for EM counterparts of gravitational wave events: brief FRB-like signals from charged CBCs (especially binary black hole mergers and plunging neutron star - black hole mergers) and short-GRB-less X-ray transients. I will also discuss the physical processes that contribute to the delay timescale between CBC signals and their...
Neutron star mergers have long been believed to drive short-duration gamma-ray bursts, one of the most powerful explosions in the universe. They have also long been believed to be a promising source of the r-process isotopes observed in the Milky Way. These two theories were violently validated in the observation of the first neutron star merger in gravitational waves. The electromagnetic...
The next decade of Universe exploration is expected to undergo a revolution for the transient astrophysics. The third generation of gravitational-wave (GW) observatories, such as Einstein Telescope (ET) and Cosmic Explorer (CE) will allow us for the first time to observe GWs along the cosmic history back to the cosmological dark ages. These observatories will be an unprecedented resource to...
A kilonova signal is generally expected after a Black Hole - Neutron Star merger. The strength of the signal is related to the Equation of State of neutron star matter and it increases with the stiffness of the latter. The recent results obtained by NICER suggest a rather stiff Equation of State and the expected kilonova signal is therefore strong, at least if the mass of the Black Hole does...
As the new era of GW-led multi-messenger astronomy is ushered in, one may especially expect to catch GW signals from neutron star-black hole (NSBH) mergers and search for associated as-yet undiscovered NSBH kilonova emissions. However, in spite of many efforts for follow-up searches of potential NSBH candidates during the third run (O3) of LIGO/Virgo Collaboration (LVC), no surely EM...
Multi-messenger detections allow us to learn more about the astrophysical sources by probing different physics and also by guiding the astronomers more precisely with low latency follow-ups. We will present the statistically optimal methods for multi-messenger searches and summarize the joint gravitational-wave and high energy neutrino event searches' results of Low Latency Algorithm for...
Long gamma-ray bursts are associated with the core-collapse of massive, rapidly spinning stars. However, the believed efficient angular momentum transport in stellar interiors leads to predominantly slowly-spinning stellar cores. In this talk, I will report on binary stellar evolution and population synthesis calculations, showing that tidal interactions in close binaries not only can explain...
The isolated formation channel is one of the most studied formation scenarios for stellar mass black hole binary (BBH) mergers detected by LIGO and Virgo. Focusing on the effects of
uncertain stellar and binary physics, we investigate this BBH formation channel using the rapid binary population
synthesis code SeBa.
Regardless of our assumptions, the two must common formation path within...
Magnetic fields play an important role in the dynamics of binary neutron star mergers and on their gravitational wave and electromagnetic emission (such as the production of relativistic jets and short gamma-ray bursts). In this talk I will review some of the main results in the field of fully general relativistic magnetohydrodynamic (GRMHD) simulations of these systems focusing in particular...
In the era of multi-messenger astrophysics, binary neutron star (BNS) mergers have proven to be one of the prime sources of gravitational waves (GWs), also able to produce short-gamma ray bursts (SGRBs) as well as radioactively powered kilonovae. General relativistic magnetohydrodynamic (GRMHD) simulations represent a fundamental tool to probe the underlying physical mechanisms involved in...
The first neutron star-neutron star merger (NS-NS: GW170817) was detected in gravitational waves by LIGO/Virgo in a galaxy in which the majority of star formation was taking place a long time ago (∼11 Gyr). Only some extreme evolutionary models (with small NS natal kicks and high common envelope efficiency) can generate NS-NS merger rates in old host galaxies consistent with the LIGO/Virgo...
Tens of binary black hole (BH) mergers and a few binary neutron star (NS) mergers have been observed by LIGO/Virgo gravitational wave detectors, strongly advancing our understanding of the lives and deaths of compact objects. Recent realistic globular cluster simulations have shown that dynamical formations of binary BHs can entirely explain the observed rate of binary BH mergers. At the same...
Gravitational wave events involving very massive neutron stars, such as
GW190425, have just started to be detected. Although typically classified as
binary neutron star mergers, the observed gravitational-wave signal is
usually not able to clearly establish a neutron-star nature of the massive
primary object in the system. Thus, a black hole--neutron star system cannot
be fully ruled...
Primordial black holes are black holes that may have formed in the
early Universe. Their masses potentially span a range from as low as
the Planck mass up to many orders of magnitude above the solar mass.
This, in particular, includes black holes with mass (and spin)
comparable to those recently discovered by LIGO/Virgo. These may well
be primordial in nature, which may also be true...
