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A hidden friend for the galactic center black hole, Sgr A*
Smadar Naoz, Clifford M. Will, Enrico Ramirez-Ruiz +3
The hierarchical nature of galaxy formation suggests that a supermassive black hole binary could exist in our galactic center. We propose a new approach to constraining the possibl…
LB-1 is inconsistent with the X-ray source population and pulsar-black hole binary searches in the Milky Way
Mohammadtaher Safarzadeh, Enrico Ramirez-Ruiz, Charles Kilpatrick
If confirmed, a wide binary system of 70 black hole (BH) and an 8 main sequence star (LB-1) is observed to reside in the Milky Way (MW). We show that long t…
Common Envelope Wind Tunnel: The Effects of Binary Mass Ratio and Implications for the Accretion-Driven Growth of LIGO Binary Black Holes
Soumi De, Morgan MacLeod, Rosa Wallace Everson +3
We present three-dimensional local hydrodynamic simulations of flows around objects embedded within stellar envelopes using a "wind tunnel" formalism. Our simulations model the com…
GRB 180620A: Evidence for late-time energy injection
Rosa L. Becerra, Fabio De Colle, Alan M. Watson +11
The early optical emission of gamma-ray bursts gives an opportunity to understand the central engine and first stages of these events. About 30\% of GRBs present flares whose origi…
The Tidal Disruption of Sun-like Stars by Massive Black Holes
Jamie Law-Smith, James Guillochon, Enrico Ramirez-Ruiz
We present the first simulations of the tidal disruption of stars with realistic structures and compositions by massive black holes (BHs). We build stars in the stellar evolution c…
Thermal evolution of neo-neutron stars. I: envelopes, Eddington luminosity phase and implications for GW170817
Mikhail V. Beznogov, Dany Page, Enrico Ramirez-Ruiz
A neo-neutron star is a hot neutron star that has just become transparent to neutrinos. In a core collapse supernova or accretion induced collapse of a white dwarf the neo-neutron…