Now showing items 1-12 of 12

  • Accretion disks around kicked black holes: post-kick dynamics 

    Ponce, Marcelo; Faber, Joshua; Lombardi, James C. Jr (Institute of Physics, 2012-12-29)
    Numerical calculations of merging black hole binaries indicate that asymmetric emission of gravitational radiation can kick the merged black hole at up to thousands of km s–1, and a number of systems have been observed ...
  • Dynamics and collisional evolution of closely packed planetary systems 

    Hwang, Jason A.; Steffen, Jason H.; Lombardi, James C. Jr; Rasio, Frederic A. (Oxford Academic, 2017-06-07)
    High-multiplicity Kepler systems (referred to as Kepler multis) are often tightly packed and may be on the verge of instability. Many systems of this type could have experienced past instabilities, where the compact orbits ...
  • An efficient radiative cooling approximation for use in hydrodynamic simulations 

    Lombardi, James C. Jr; McInally, William G.; Faber, Joshua A. (Oxford University Press, 2015-02-11)
    To make relevant predictions about observable emission, hydrodynamical simulation codes must employ schemes that account for radiative losses, but the large dimensionality of accurate radiative transfer schemes is often ...
  • Hydrodynamics of Collisions Between Sub-Neptunes 

    Hwang, Jason; Chatterjee, Sourav; Lombardi, James C. Jr; Steffen, Jason; Rasio, Frederic (American Astronomical Society, 2017)
    Many studies of high-multiplicity, tightly-packed planetary systems, similar to those observed in the Kepler sample, suggest that dynamical instabilities are common and affect both the orbits and planet structures. The ...
  • The influence of neutrinos on r-process nucleosynthesis in the ejecta of black hole–neutron star mergers 

    Roberts, Luke F.; Lippuner, Jonas; Duez, Matthew D.; Faber, Joshua A.; Foucart, Francois; Lombardi, James C. Jr; Ning, Sandra; Ott, Christian D.; Ponce, Marcelo (Oxford University Press, 2016-10-12)
    During the merger of a black hole and a neutron star, baryonic mass can become unbound from the system. Because the ejected material is extremely neutron-rich, the r-process rapidly synthesizes heavy nuclides as the material ...
  • Mixing in massive stellar mergers 

    Gaburov, Evghenii; Lombardi, James C. Jr; Portegies Zwart, Simon (Oxford University Press, 2007-09-21)
    The early evolution of dense star clusters is possibly dominated by close interactions between stars, and physical collisions between stars may occur quite frequently. Simulating a stellar collision event can be an intensive ...
  • On the onset of runaway stellar collisions in dense star clusters -- II. Hydrodynamics of three-body interactions 

    Gaburov, Evghenii; Lombardi, James C. Jr; Portegies Zwart, Simon (Oxford University Press, 2009-10-18)
    The onset of runaway stellar collisions in young star clusters is more likely to initiate with an encounter between a binary and a third star than between two single stars. Using the initial conditions of such three-star ...
  • Outcomes of Grazing impacts between Sub-Neptunes in Kepler Multis 

    Hwang, Jason S.; Chatterjee, Sourav; Lombardi, James C. Jr; Steffen, Jason H.; Rasio, Frederic (Institute of Physics, 2018-01-01)
    Studies of high-multiplicity, tightly packed planetary systems suggest that dynamical instabilities are common and affect both the orbits and planet structures, where the compact orbits and typically low densities make ...
  • Stability and Coalescence of Massive Twin Binaries 

    Hwang, J.; Lombardi, James C. Jr; Rasio, F. A.; Kalogera, V. (The American Astronomical Society., 2015-06-12)
    Massive stars are usually found in binaries, and binaries with periods less than 10 days may have a preference for near equal component masses ("twins"). In this paper we investigate the evolution of massive twin binaries ...
  • Twin Binaries: Studies of Stability, Mass Transfer, and Coalescence 

    Lombardi, James C. Jr; Holtzman, William; Dooley, K. L.; Gearity, Kyle; Kalogera, V.; Rasio, F. A. (IOP, 2011-07-28)
    Motivated by suggestions that binaries with almost equal-mass components ("twins") play an important role in the formation of double neutron stars and may be rather abundant among binaries, we study the stability of ...
  • Twin Binaries: Studies of Stability, Mass Transfer, and Coalescence 

    Lombardi, James C. Jr; Holtzman, William; Dooley, Katherine L.; Gearity, Kyle; Kalogera, Vicky; Rasio, Frederic (Institute of Physics, 2011-08-20)
    Motivated by suggestions that binaries with almost equal-mass components (“twins”) play an important role in the formation of double neutron stars and may be rather abundant among binaries, we study the stability of ...
  • V1309 Sco: Understanding a merger 

    Nandez, J. L. A.; Ivanova, N.; Lombardi, James C. Jr (IOP, 2014-05-01)
    One of the two outcomes of a common envelope (CE) event is a merger of the two stars. To date, the best known case of a binary merger is the V1309 Sco outburst, where the orbital period was known and observed to decay up ...