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theoreticalbackground_cbc [2022/02/08 09:05]
theoastro 		theoreticalbackground_cbc [2022/07/18 10:10] (current)
theoastro [Black Hole - Neutron Star Systems]
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-===== Theoretical Background ===== 
- 
-==== Neutron Stars and Black Holes ==== 
-Neutron stars and black holes are possible end states of the stellar evolution for massive stars. While the gravitational forces within black holes are so large that the entire material gets compressed within the central singularity, nuclear forces enable neutron stars, which have slightly smaller masses than black holes, to be stable without a spacetime singularity. However, the density inside a neutron star exceeds any kind of density that we can realize here on earth and can reaches a few times nuclear saturation density, i.e., up to a few hundred tons per cubic centimeter. 
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 ==== Compact Binary Mergers ==== ==== Compact Binary Mergers ====
  
 Numerous compact objects are bound inside binary systems, some of these, so-called compact binary systems are  either binary neutron  star systems (often also called double neutron star systems), black hole - neutron star systems, and binary black hole systems.  Numerous compact objects are bound inside binary systems, some of these, so-called compact binary systems are  either binary neutron  star systems (often also called double neutron star systems), black hole - neutron star systems, and binary black hole systems. 
-On top of these, well-established scenarios, there is also the possibility for the existence of exotic compact objects that also could be bound inside compact binaries. These exotic compact objects are, e.g., boson stars, i.e., stars consisting of bosonic fields, proca stars, gravastars. Up to now, there is no evidence for the existence of such exotic compact objects.+On top of these, well-established scenarios, there is also the possibility for the existence of exotic compact objects that also could be bound inside compact binaries. In the following, we will provide some additional information about  
 + 
 +  * **[[binary_neutron_stars|Binary Neutron Stars]]** 
 +  * **[[black_hole_neutron_star_binary|Black Hole - Neutron Star Binary]]**
  
-==== Binary Neutron Star Systems ==== 
-{{BNS_merger.mp4|A simulated binary neutron star merger}} 
  
-A system consisting of two neutron stars is called a binary neutron star or a double neutron star system. Numerous of these systems exist and have been observed through electromagnetic observations. Among the best well-known binary neutron star system is the Hulse-Taylor Pulsar. The observation of the increase in the orbital frequency of the Hulse-Taylor Pulsar has been the first indirect evidence for the emission of gravitational waves.  
-In 2017 it was possible, for the first time, to detect directly gravitational waves emitted from the merger of two neutron stars, the system GW170817. In addition to the emission of gravitational waves, neutron star mergers are also bright sources of electromagnetic counterparts. In particular, the ejected material that can trigger a kilonova or the remnant system consisting that can be the central engine of a short gamma-ray bursts. 
  
-==== Black Hole - Neutron Star Systems ==== 
-Similar to binary neutron star systems, a neutron star can also be on a bound orbits with a black hole. Such black hole - neutron star systems have been observed for the first time in January 2020 with GW200105 and GW200115.  
-Given the presence of matter the collision of a black hole neutron star system could in principle also be connected with electromagnetic counterparts, however, we have not been able to confidentially detect a short gamma-ray burst or a kilonova created from a black hole - neutron star collision.  
Last modified: le 2022/02/08 09:05

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