Asna Ansari
Current Organizations / Institutes
The organizations/institutes from the scholar's latest article
Research Subjects
Research Interests
Asna Ansari has a total of 6 co-authors. Here are the top co-authors by number of shared publications:
- Evert Glebbeek
Department of Astrophysics/IMAPP Radboud University PO Box 9010 6500 GL Nijmegen Nijmegen the Netherlands
1 shared publication - Francesca Valsecchi
Northwestern University
1 shared publication - Jeffrey E. McClintock
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
1 shared publication - Tassos Fragos
Département d’Astronomie, Université de Genève
1 shared publication - Tsing-Wai Wong
Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA) Department of Physics and Astronomy Northwestern University 2145 Sheridan Road 60208 Evanston IL USA
1 shared publication - Vicky Kalogera
Northwestern University
1 shared publication
Latest Publications
- Open Access
Understanding Compact Object Formation and Natal Kicks. IV. The case of IC 10 X-1
The extragalactic X-ray binary IC 10 X-1 has attracted attention as it is possibly the host of the most massive stellar-mass black-hole (BH) known to date. Here we consider all available observational constraints and construct its evolutionary history up to the instant just before the formation of the BH. Our analysis accounts for the simplest possible history that includes three evolutionary phases: binary orbital dynamics at core collapse, common envelope (CE) evolution, and evolution of the BH--helium star binary progenitor of the observed system. We derive the complete set of constraints on the progenitor system at various evolutionary stages. Specifically: right before the core collapse event, we find the mass of the BH immediate progenitor to be > 31 Msun (at 95% of confidence, same hereafter). The magnitude of the natal kick imparted to the BH is constrained to be < 130 km/s. Furthermore, we find that the "enthalpy" formalism recently suggested by Ivanova & Chaichenets is able to explain the existence of IC 10 X-1 without the need of invoking unreasonably high CE efficiencies. With this physically motivated formalism, we find that the CE efficiency required to explain the system is in the range of 0.6--1.
Open AccessUnderstanding Compact Object Formation and Natal Kicks. IV. The case of IC 10 X-1
The extragalactic X-ray binary IC 10 X-1 has attracted attention as it is possibly the host of the most massive stellar-mass black-hole (BH) known to date. Here we consider all available observational constraints and construct its evolutionary history up to the instant just before the formation of the BH. Our analysis accounts for the simplest possible history that includes three evolutionary phases: binary orbital dynamics at core collapse, common envelope (CE) evolution, and evolution of the BH--helium star binary progenitor of the observed system. We derive the complete set of constraints on the progenitor system at various evolutionary stages. Specifically: right before the core collapse event, we find the mass of the BH immediate progenitor to be > 31 Msun (at 95% of confidence, same hereafter). The magnitude of the natal kick imparted to the BH is constrained to be < 130 km/s. Furthermore, we find that the "enthalpy" formalism recently suggested by Ivanova & Chaichenets is able to explain the existence of IC 10 X-1 without the need of invoking unreasonably high CE efficiencies. With this physically motivated formalism, we find that the CE efficiency required to explain the system is in the range of 0.6--1.