Hypervelocity Planets and Transits Around Hypervelocity Stars

Abstract

The disruption of a binary star system by the massive black hole at the Galactic Centre, SgrA*, can lead to the capture of one star around SgrA* and the ejection of its companion as a hypervelocity star (HVS). We consider the possibility that these stars may have planets and study the dynamics of these planets. Using a direct $N$-body integration code, we simulated a large number of different binary orbits around SgrA*. For some orbital parameters, a planet is ejected at a high speed. In other instances, a HVS is ejected with one or more planets orbiting around it. In these cases, it may be possible to observe the planet as it transits the face of the star. A planet may also collide with its host star. In such cases the atmosphere of the star will be enriched with metals. In other cases, a planet is tidally disrupted by SgrA*, leading to a bright flare.

8 pages, 5 figures, 2 tables, accepted for publication in MNRAS

References in corpus (15)

• Tidal Evolution of Close-in Extra-Solar Planets
• A gas cloud on its way towards the super-massive black hole in the Galactic Centre
• Falling Transiting Extrasolar Giant Planets
• Hypervelocity Stars: Predicting the Spectrum of Ejection Velocities
• Hypervelocity Stars. I. The Spectroscopic Survey
• A Successful Targeted Search for Hypervelocity Stars
• Hypervelocity Stars III. The Space Density and Ejection History of Main Sequence Stars from the Galactic Center
• Runaway and hypervelocity stars in the Galactic halo: Binary rejuvenation and triple disruption
• Sgr A* flares: tidal disruption of asteroids and planets?
• Production of Hypervelocity Stars through Encounters with Stellar-Mass Black Holes in the Galactic Centre
• Dynamical and evolutionary constraints on the nature and origin of hypervelocity stars
• Hypervelocity Collisions of Binary Stars at the Galactic Centre
• HVS7: a chemically peculiar hyper-velocity star
• Ejection of hypervelocity binary stars by a black hole of intermediate mass orbiting Sgr A*
• Are SMBHs shrouded by "super-Oort" clouds of comets and asteroids?

Cited by in corpus (15)

• Disruption of a Proto-Planetary Disk by the Black Hole at the Milky Way Centre
• High velocity stars from close interaction of a globular cluster and a super massive black hole
• Galactic Panspermia
• Constraining Milky Way mass with Hypervelocity Stars
• Steeper stellar cusps in galactic centers from binary disruption
• Stellar Accelerations and the Galactic Gravitational Field
• On the impact of relativistic gravity on the rate of tidal disruption events
• Hot Jupiter and ultra-cold Saturn formation in dense star clusters
• Spinup and Disruption of Interstellar Asteroids by Mechanical Torques, and Implications for 1I/2017 U1 (`Oumuamua)
• Transits Probabilities Around Hypervelocity and Runaway Stars
• Detecting Stars at the Galactic Centre via Synchrotron Emission
• Constraints on the abundance of $0.01c$ stellar engines in the Milky Way
• A Candidate High-Velocity Exoplanet System in the Galactic Bulge
• Scouting the spectrum for interstellar travellers
• The Fate of Binary Stars Hosting Planets upon Interaction with Sgr A* Black hole