74 citations · 103 across the 11 of their papers we have counts for
13 papers
Star Formation Mitosis: The Effects of Particle Splitting on the Star Formation Outcome
Shivan Khullar, Michael Y. Grudić, Christopher D. Matzner +3
Particle splitting can increase the dynamic range in Lagrangian astrophysical simulations by several orders of magnitude. However, such methods can introduce numerical noise that m…
Non-ideal MHD and protostellar feedback effects on disc formation and evolution in numerical simulations of star cluster formation
Nina Filippova, Stella S. R. Offner, Michael Y. Grudic +1
While recent surveys have resolved hundreds of nearby protostellar discs, numerical simulations assuming ideal magnetohydrodynamics (MHD) have historically struggled to achieve dis…
Residual energy in weakly compressible turbulence with a mean guide field
R. Skalidis, A. Tritsis, J. R. Beattie +1
The energy distribution is a fundamental property of magnetohydrodynamic (MHD) turbulence. In strongly magnetized turbulence energy imbalances arise and are quantified by the resid…
Dust Battery: A Novel Mechanism for Seed Magnetic Field Generation in the Early Universe
Nadine H. Soliman, Philip F. Hopkins, Jonathan Squire
We propose a novel dust battery mechanism for generating seed magnetic fields in the early universe, in which charged dust grains are radiatively accelerated, inducing strong elect…
Rapid, strongly magnetized accretion in the zero-net-vertical-flux shearing box
Jonathan Squire, Eliot Quataert, Philip F. Hopkins
We show that there exist two qualitatively distinct turbulent states of the zero-net-vertical-flux shearing box. The first, which has been studied in detail previously, is characte…
Are Stars Really Ingesting their Planets? Examining an Alternative Explanation
Nadine H. Soliman, Philip F. Hopkins
Numerous stars exhibit surprisingly large variations in their refractory element abundances, often interpreted as signatures of planetary ingestion events. In this study, we propos…
The First Evidence of a Host Star Metallicity Cut-off In The Formation of Super-Earth Planets
Kiersten M. Boley, Jessie L. Christiansen, Jon Zink +7
Planet formation is expected to be severely limited in disks of low metallicity, owing to both the small solid mass reservoir and the low opacity accelerating the disk gas dissipat…
Thermodynamics of Giant Molecular Clouds: The Effects of Dust Grain Size
Nadine H. Soliman, Philip F. Hopkins, Michael Y. Grudić
The dust grain size distribution (GSD) likely varies significantly across star-forming environments in the Universe, but its impact on star formation remains unclear. This ambiguit…
Playing with FIRE: A Galactic Feedback-Halting Experiment Challenges Star Formation Rate Theories
Shivan Khullar, Christopher D. Matzner, Norman Murray +4
Stellar feedback influences the star formation rate (SFR) and the interstellar medium of galaxies in ways that are difficult to quantify numerically, because feedback is an essenti…
Dust-Evacuated Zones Near Massive Stars: Consequences of Dust Dynamics on Star-forming Regions
Nadine H. Soliman, Philip F. Hopkins, Michael Y. Grudić
Stars form within dense cores composed of both gas and dust within molecular clouds. However, despite the crucial role that dust plays in the star formation process, its dynamics i…
Microphysical Regulation of Non-Ideal MHD in Weakly-Ionized Systems: Does the Hall Effect Matter?
Philip F. Hopkins, Jonathan Squire, Raphael Skalidis +1
The magnetohydrodynamics (MHD) equations plus 'non-ideal' (Ohmic, Hall, ambipolar) resistivities are widely used to model weakly-ionized astrophysical systems. We show that if grad…
The effects of metallicity and cooling physics on fragmentation: implications on direct-collapse black hole formation
C. Corbett Moran, M. Y. Grudić, P. F. Hopkins
A promising supermassive black hole seed formation channel is that of direct collapse from primordial gas clouds. We perform a suite of 3D hydrodynamics simulations of an isolated…
Resonant drag instability of grains streaming in fluids
Jonathan Squire, Philip F. Hopkins
We show that grains streaming through a fluid are generically unstable if their velocity, projected along some direction, matches the phase velocity of a fluid wave (linear oscilla…