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Observational Cosmology With Semi-Relativistic Stars
Abraham Loeb, James Guillochon
Galaxy mergers lead to the formation of massive black hole binaries which can accelerate background stars close to the speed of light. We estimate the comoving density of ejected s…
The Fastest Unbound Stars in the Universe
James Guillochon, Abraham Loeb
The discovery of hypervelocity stars (HVS) leaving our galaxy with speeds of nearly km s has provided strong evidence towards the existence of a massive compact obj…
A Luminous, Fast Rising UV-Transient Discovered by ROTSE: a Tidal Disruption Event?
J. Vinko, F. Yuan, R. M. Quimby +6
We present follow-up observations of an optical transient (OT) discovered by ROTSE on Jan. 21, 2009. Photometric monitoring was carried out with ROTSE-IIIb in the optical and Swift…
Illuminating Massive Black Holes With White Dwarfs: Orbital Dynamics and High Energy Transients from Tidal Interactions
Morgan MacLeod, Jacqueline Goldstein, Enrico Ramirez-Ruiz +2
White dwarfs (WDs) can be tidally disrupted only by massive black holes (MBHs) with masses less than . These tidal interactions feed material to the MBH well abov…
Possible Origin of the G2 Cloud from the Tidal Disruption of a Known Giant Star by Sgr A*
James Guillochon, Abraham Loeb, Morgan MacLeod +1
The discovery of the gas cloud G2 on a near-radial orbit about Sgr A* has prompted much speculation on its origin. In this Letter, we propose that G2 formed out of the debris strea…