On the Apparent Lack of Be X-ray Binaries with Black Holes (2009)
Belczynski, Krzysztof, Ziolkowski, Janusz
In the Galaxy there are 64 Be X-ray binaries. Out of those, 42 host a neutron star, and for the reminder the nature of a companion is not known. None, so far, is known to host a black hole. There...
Rates and Delay Times of Type Ia Supernovae (2009)
Ruiter, Ashley J., Belczynski, Krzysztof, Fryer, Chris L.
We analyze the evolution of binary stars to calculate synthetic rates and delay times of the most promising Type Ia Supernovae progenitors. We present and discuss evolutionary scenarios in which a...
On The Maximum Mass of Stellar Black Holes (2009)
Belczynski, Krzysztof, Bulik, Tomasz, Fryer, Chris L., Ruiter, Ashley, Vink, Jorick S., Hurley, Jarrod R.
We present the spectrum of compact object masses: neutron stars and black holes that originate from single stars in different environments. In particular, we show the dependence of maximum black hole...
On The Origin Of The Highest Redshift Gamma-Ray Burst GRB 080913 (2008)
Belczynski, Krzysztof, Hartmann, Dieter H., Fryer, Chris L., Holz, Daniel E., O'Shea, Brian
GRB 080913, discovered by SWIFT, is the most distant gamma-ray burst (GRB) known to-date, with a spectroscopically determined redshift of z=6.7. The detection of a burst at such an early epoch of the...
Double Compact Objects as Low-frequency Gravitational Wave Sources (2008)
Belczynski, Krzysztof, Benacquista, Matthew, Bulik, Tomasz
We study the galactic population of double compact objects (NS-NS, BH-NS, BH-BH binaries) to investigate the number (if any) of these systems that can potentially be detected with LISA at low...
Cataclysmic variables in globular clusters, the galactic center, and local space (2008)
Heinke, Craig O., Ruiter, Ashley J., Muno, Michael P., Belczynski, Krzysztof
We compare the X-ray spectra and luminosities, in the 2-8 keV band, of known and suspected cataclysmic variables (CVs) in different environments, assessing the nature of thesesource populations....
IC10 X-1: the immediate progenitor of a double black hole binary (2008)
Bulik, Tomasz, Belczynski, Krzysztof, Prestwich, Andrea
We follow the evolution of IC10 X-1, the extragalactic binary hosting the most massive known stellar black hole with the mass of at least $23 \msun$. A massive companion of this black hole is a $35...
Cataclysmic Variables in Globular Clusters, the Galactic Center, and Local Space (2008)
Heinke, Craig O., Ruiter, Ashley J., Muno, Michael P., Belczynski, Krzysztof
We compare the X-ray spectra and luminosities, in the 2-8 keV band, of known and suspected cataclysmic variables (CVs) in different environments, assessing the nature of these source populations....
Compact object modeling with the StarTrack population synthesis code (2008)
Belczynski, Krzysztof, Kalogera, Vassiliki, Rasio, Frederic A., Taam, Ronald E., Zezas, Andreas, Bulik, Tomasz, ...
We present a comprehensive description of the population synthesis code StarTrack. The original code has been significantly modified and updated. Special emphasis is placed here on processes leading...
Short-Hard Gamma-Ray Bursts in Young Host Galaxies: the Effect of Prompt Twins (2007)
Belczynski, Krzysztof, Stanek, K. Z., Fryer, Chris L.
We investigate the effect of including a significant ``binary twin'' population (binaries with almost equal mass stars, q = M2/M1 > 0.95) for the production of double compact objects and some...
The Contribution of Halo White Dwarf Binaries to the LISA Signal (2007)
Ruiter, Ashley J., Belczynski, Krzysztof, Benacquista, Matthew, Holley-Bockelmann, Kelly
Galactic double white dwarfs were postulated as a source of confusion limited noise for LISA, the future space-based gravitational wave observatory. Until very recently, the Galactic population...
The Total Merger Rate of Compact Object Binaries In The Local Universe (2007)
Sadowski, Aleksander, Belczynski, Krzysztof, Bulik, Tomasz, Ivanova, Natalia, Rasio, Frederic A., O'Shaughnessy, Richard
Using a population synthesis approach, we compute the total merger rate in the local Universe for double neutron stars, double black holes, and black hole -- neutron star binaries. These compact...
Belczynski, Krzysztof, Taam, Ronald E., Rantsiou, Emmanouela, Van Der Sluys, Marc
The evolution of the spin and tilt of black holes in compact black hole - neutron star and black hole - black hole binary systems is investigated within the framework of the coalescing compact star...
On the rarity of double black hole binaries: consequences for gravitational-wave detection (2006)
Belczynski, Krzysztof, Taam, Ronald E., Kalogera, Vassiliki, Rasio, Frederic A., Bulik, Tomasz
Double black hole binaries are among the most important sources of gravitational radiation for ground-based detectors such as LIGO or VIRGO. Even if formed with lower efficiency than double neutron...
The Lack of Gamma-Ray Bursts from Population III Binaries (2006)
Belczynski, Krzysztof, Bulik, Tomasz, Heger, Alexander, Fryer, Chris
We study the evolution of first star (Population III) binaries. Under specific conditions, these stars may produce high redshift gamma-ray bursts (GRBs). We demonstrate that the occurrence rate of...
A Study of Compact Object Mergers as Short Gamma-ray Burst Progenitors (2006)
Belczynski, Krzysztof, Perna, Rosalba, Bulik, Tomasz, Kalogera, Vassiliki, Ivanova, Natalia, Lamb, Donald Q.
We present a theoretical study of double compact objects as potential short/hard gamma-ray burst (GRB) progenitors. An updated population synthesis code StarTrack is used to calculate properties of...
Belczynski, Krzysztof, Benacquista, Matthew, Larson, Shane L., Ruiter, Ashley J.
Compact object binaries, mostly double with dwarfs, are believed to be a potential source of confusion-limited noise for the Laser Interferometer Space Antenna (LISA). In a specific frequency range,...
Eccentricities of Double Neutron Star Binaries (2005)
Ihm, Catherine Mia, Kalogera, Vassiliki, Belczynski, Krzysztof
Recent pulsar surveys have increased the number of observed double neutron stars (DNS) in our galaxy enough so that observable trends in their properties are starting to emerge. In particular, it has...
New constraints on SN Ia progenitor models (2005)
Belczynski, Krzysztof, Bulik, Tomasz, Ruiter, Ashley J.
We use the StarTrack population synthesis code to discuss potential progenitor models of SN Ia: single degenerate scenario, semi-detached double white dwarf binary and double degenerate scenario....
The Galactic Formation Rate of Eccentric Neutron Star-White Dwarf Binaries (2004)
Kalogera, Vassiliki, Kim, Chunglee, Lorimer, Duncan R., Ihm, Mia, Belczynski, Krzysztof
In this paper we consider the population of eccentric binaries with a neutron star and a white dwarf that has been revealed in our galaxy in recent years through binary pulsar observations. We apply...
The Galactic Double-Neutron-Star Merger Rate: Most Current Estimates (2004)
Kim, Chunglee, Kalogera, Vassiliki, Lorimer, Duncan R., Ihm, Mia, Belczynski, Krzysztof
We summarize our results on the Galactic merger rate of double neutron stars (DNS) in view of the recent discovery of PSR J0737-3039. We also present previously unpublished results for the 'global'...
A Comprehensive Study of Young Black Hole Populations (2004)
Belczynski, Krzysztof, Sadowski, Aleksander, Rasio, Frederic A.
We present theoretical models of black hole (BH) populations in young stellar environments, such as starbursts and young star clusters. Using a population synthesis approach we compute the formation...
First Stellar Binary Black Holes: Strongest Gravitational Wave Burst Sources (2004)
Belczynski, Krzysztof, Bulik, Tomasz, Rudak, Bronislaw
Evolution of first population of massive metal-free binary stars is followed. Due to the low metallicity, the stars are allowed to form with large initial masses and to evolve without significant...
Nutzman, Philip, Kalogera, Vicky, Finn, Lee Samuel, Hendrickson, Cy, Belczynski, Krzysztof
We examine the selection effects that determine how the population of inspiraling binary compact objects (BCOs) is reflected by those potentially observed with ground-based interferometers like LIGO....
On the Chandra X-ray Sources in the Galactic Center (2003)
Belczynski, Krzysztof, Taam, Ronald E.
Recent deep Chandra surveys of the Galactic center region have revealed the existence of a faint, hard X-ray source population. While the nature of this population is unknown, it is likely that...
Galactic Populations of Ultracompact Binaries (2003)
Belczynski, Krzysztof, Taam, Ronald E.
Recent RXTE and Chandra discoveries of low mass X-ray binaries with ultra-short orbital periods have initiated theoretical work on the origins of these peculiar systems. Using the StarTrack...
Formation and Evolution of Microquasar GRS 1915+105 (2002)
Belczynski, Krzysztof, Bulik, Tomasz
Using the StarTrack population synthesis code we analyze the possible formation channels of the Galactic microquasar GRS 1915+105 harboring the most massive known stellar black hole. We find that we...
Merger Sites of Double Neutron Stars and their Host Galaxies (2002)
Belczynski, Krzysztof, Bulik, Tomasz, Kalogera, Vassiliki
Using the StarTrack population synthesis code we analyze the formation channels possibly available to double neutron star binaries and find that they can be richer than previously thought. We...
Population synthesis of compact objects: neutron stars, strange (quark) stars and black holes (2002)
Belczynski, Krzysztof, Bulik, Tomasz, Kluzniak, Wlodzimierz
We compute and present the distribution in mass of single and binary neutron stars, strange stars, and black holes. The calculations were performed using a stellar population synthesis code. We...
Short GRBs and Mergers of Compact Objects: Observational Constraints (2002)
Perna, Rosalba, Belczynski, Krzysztof
GRB data accumulated over the years have shown that the distribution of their time duration is bimodal. While there is some evidence that long bursts are associated with star-forming regions, nothing...
Study of Gamma Ray Burst Binary Progenitors (2001)
Belczynski, Krzysztof, Bulik, Tomasz, Rudak, Bronislaw
Recently much work in studying Gamma-Ray Burst has been devoted to revealing the nature of outburst mechanism and studies of GRB afterglows. These issues have also been closely followed by the quest...
Belczynski, Krzysztof, Kalogera, Vassiliki, Bulik, Tomasz
A new generation of ground-based interferometric detectors for gravitational waves is currently under construction or has entered the commissioning phase (LIGO, VIRGO, GEO600, TAMA). We study the...
Gamma Ray Burst progenitors - a case for helium star mergers (2000)
Belczynski, Krzysztof, Bulik, Tomasz, Rudak, Bronislaw
Recently much work in Gamma-Ray Burst (GRB) studies was devoted to revealing the nature of outburst mechanism and to looking for GRB progenitors. Several types of progenitors were proposed for GRBs....
Population synthesis of neutron stars, strange (quark) stars and black holes (2000)
Belczynski, Krzysztof, Bulik, Tomasz, Kluzniak, Wlodzimierz
We compute and present the distribution in mass of single and binary neutron stars, strange stars, and black holes. The calculations were performed using a stellar population synthesis code. We...
Looking for GRB progenitors (2000)
Belczynski, Krzysztof, Bulik, Tomasz, Rudak, Bronislaw
Using stellar binary population synthesis code we calculate the production rates and lifetimes of several types of possible GRB progenitors. We consider mergers of double neutron stars, black hole...
Distribution of binary mergers around galaxies (2000)
Bulik, Tomasz, Belczynski, Krzysztof
We use a stellar binary population synthesis code to find the lifetimes and velocities of several types of possible GRB progenitors: double neutron stars, black hole neutron stars, black hole white...
Distribution of black hole binaries around galaxies (1999)
Belczynski, Krzysztof, Bulik, Tomasz, Zbijewski, Wojciech
Compact object mergers are one of the favorite models of GRBs. It has been noted that in opposition to the collapsars, compact object mergers do not necessarily take place in the host galaxies, and...
Distribution of compact object mergers around galaxies (1999)
Bulik, Tomasz, Belczynski, Krzysztof, Zbijewski, Wojciech
Compact object mergers are one of the currently favored models for the origin of GRBs. The discovery of optical afterglows and identification of the nearest, presumably host, galaxies allows the...
The effect of supernova natal kicks on compact object merger rate (1999)
Belczynski, Krzysztof, Bulik, Tomasz
Mergers of compact objects may lead to different astrophysical phenomena: they may provide sources of observable gravitational radiation, and also may be connected with gamma-ray bursts. Estimate of...