Supernovae in the Central Parsec: A Mechanism for Producing Spatially Anisotropic Hypervelocity Stars

Abstract

Several tens of hyper-velocity stars (HVSs) have been discovered escaping our Galaxy. These stars share a common origin in the Galactic centre and are distributed anisotropically in Galactic longitude and latitude. We examine the possibility that HVSs may be created as the result of supernovae occurring within binary systems in a disc of stars around Sgr A* over the last 100 Myr. Monte Carlo simulations show that the rate of binary disruption is ~10^-4 yr^-1, comparable to that of tidal disruption models. The supernova-induced HVS production rate (Γ_HVS) is significantly increased if the binaries are hardened via migration through a gaseous disc. Moderate hardening gives Γ_HVS ~ 2*10^-7 yr^-1 and an estimated population of ~20 HVSs in the last 100 Myr. Supernova-induced HVS production requires the internal and external orbital velocity vectors of the secondary binary component to be aligned when the binary is disrupted. This leaves an imprint of the disc geometry on the spatial distribution of the HVSs, producing a distinct anisotropy.

7 pages, 4 figures. Accepted for publication in the Astrophysical Journal

References in corpus (12)

• Binary interaction dominates the evolution of massive stars
• Common Envelope Evolution: Where we stand and how we can move forward
• The Two Young Star Disks in the Central Parsec of the Galaxy: Properties, Dynamics and Formation
• Milky Way Mass Models for Orbit Calculations
• An Alternative Origin for Hypervelocity Stars
• Dynamical evolution of the young stars in the Galactic center: N-body simulations of the S-stars
• Hypervelocity Stars III. The Space Density and Ejection History of Main Sequence Stars from the Galactic Center
• The Anisotropic Spatial Distribution of Hypervelocity Stars
• S-stars in the Galactic center and hypervelocity stars in the Galactic halo: two faces of the tidal breakup of stellar binaries by the central massive black hole?
• The Nature of the Hyper-Runaway Candidate HIP 60350
• A Galactic Center Origin for HE 0437-5439, the Hypervelocity Star near the Large Magellanic Cloud
• The Nature of Hypervelocity Stars and the Time Between Their Formation and Ejection

Cited by in corpus (27)

• MMT Hypervelocity Star Survey III: A Complete Survey of Faint B-type Stars in the Northern Milky Way Halo
• Maximum speed of hypervelocity stars ejected from binaries
• Outflows and complex stellar kinematics in SDSS star forming galaxies
• High velocity stars from close interaction of a globular cluster and a super massive black hole
• On the Missing Energy Puzzle of Tidal Disruption Events
• High velocity stars from the interaction of a globular cluster and a massive black hole binary
• Steeper stellar cusps in galactic centers from binary disruption
• Hypervelocity Stars from a Supermassive Black Hole-Intermediate-mass Black Hole binary
• Can supernova kicks trigger EMRIs in the Galactic Centre?
• On the Existence of Pulsars in the Vicinity of the Massive Black Hole in the Galactic Center
• Supernova Kicks and Dynamics of Compact Remnants in the Galactic Centre
• Impact of the Galactic Disk and Large Magellanic Cloud on the Trajectories of Hypervelocity Stars Ejected from the Galactic Center
• Tidal breakup of triple stars in the Galactic Centre
• The high velocity stars in the Local Stellar Halo from Gaia and LAMOST
• On the origins of extreme velocity stars as revealed by large-scale Galactic surveys
• Constraints on the Galactic Centre environment from Gaia hypervelocity stars II: The evolved population
• The Central 300 pc of the Galaxy probed by infrared spectra of H3+ and CO: II. Expansion and morphology of the warm diffuse gas
• The fate of supernova remnants near quiescent supermassive black holes
• The luminosity function of quasars by the Principle of Maximum Entropy
• Intermediate-Mass Black Holes in binary-rich star clusters
• An Infrared Study of the Dust Properties and Geometry of the Arched Filaments HII Region with SOFIA/FORCAST
• Evolution of Supernova Remnants near the Galactic Center
• Constraints on the origins of hypervelocity stars: velocity distribution, mergers and star-formation history
• Binary Natal Kicks in the Galactic Center: X-ray Binaries, Hypervelocity Stars, and Gravitational Waves
• Can supernova shells feed supermassive black holes in galactic nuclei?
• Does slow and steady win the race? Investigating feedback processes in giant molecular clouds
• Observational signatures of the surviving donor star in the double detonation model of Type Ia supernovae