34 citations · 206 across the 42 of their papers we have counts for
11 papers · 1 filter
Interstellar Objects Outnumber Solar System Objects in the Oort Cloud
Amir Siraj, Abraham Loeb
Here, we show that the detection of Borisov implies that interstellar objects outnumber Solar system objects in the Oort cloud, whereas the reverse is true near the Sun due to the…
Observable Signatures of the Ejection Speed of Interstellar Objects from their Birth Systems
Amir Siraj, Abraham Loeb
`Oumuamua and Borisov were the first two interstellar objects confirmed in the Solar system. The upcoming commencement of the Vera C. Rubin Observatory's Legacy Survey of Space of…
Transfer of Life Between Earth and Venus with Planet-Grazing Asteroids
Amir Siraj, Abraham Loeb
Recently, phosphine was discovered in the atmosphere of Venus as a potential biosignature. This raises the question: if Venusian life exists, could it be related to terrestrial lif…
The Case for an Early Solar Binary Companion
Amir Siraj, Abraham Loeb
We show that an equal-mass, temporary binary companion to the Sun in the solar birth cluster at a separation of would have increased the likelihood of…
Searching for Black Holes in the Outer Solar System with LSST
Amir Siraj, Abraham Loeb
Planet Nine has been proposed to potentially be a black hole in the outer solar system. We investigate the accretion flares that would result from impacts of small Oort cloud objec…
Risks for Life on Proxima b from Sterilizing Impacts
Amir Siraj, Abraham Loeb
We consider the implications that a debris belt located between Proxima b and Proxima c would pose for the rate of large asteroid impacts that could sterilize Proxima b from life.…
Impacts of Dust Grains Accelerated by Supernovae on the Moon
Amir Siraj, Abraham Loeb
There is evidence that ejecta from nearby supernovae have rained down on Earth in the past. Supernovae can accelerate pre-existing dust grains in the interstellar medium to speeds…
Repeated Impact-Driven Plume Formation On Enceladus Over Megayear Timescales
Amir Siraj, Abraham Loeb
Water plumes erupting from the `tiger stripe' features on the south pole of Enceladus are thought to connect to a global subsurface ocean. Proposed origins for the initial stress n…
Detecting Interstellar Objects Through Stellar Occultations
Amir Siraj, Abraham Loeb
Stellar occultations have been used to search for Kuiper Belt and Oort Cloud objects. We propose a search for interstellar objects based on the characteristic durations ($\sim 0.1…
Observational Signatures of Sub-Relativistic Meteors
Amir Siraj, Abraham Loeb
It is currently unknown whether solid particles larger than dust from supernova ejecta rain down on Earth at high speeds. We develop a hydrodynamic and radiative model to explore t…
Possible Transfer of Life by Earth-Grazing Objects to Exoplanetary Systems
Amir Siraj, Abraham Loeb
Recently, a 30-cm object was discovered to graze the Earth's atmosphere and shift into a Jupiter-crossing orbit. We use the related survey parameters to calibrate the total number…