6 citations · 15 across the 21 of their papers we have counts for
24 papers
Stability of circumbinary orbits in misaligned triple star systems
Stephen Lepp, Rebecca G. Martin
We investigate the stability of circumbinary orbits in hierarchical triple star systems, focusing on the effects of a misaligned outer companion star. Test particles are subject to…
2D hydrodynamical simulations of Be star decretion disc formation through boundary layer effects
Madeline Overton, Zhaohuan Zhu, Rebecca G. Martin +1
Be stars are massive main-sequence stars rotating close to their breakup rate. They possess a decretion disc of material built up due to mass loss from the star, however, there is…
Positive superhumps in high mass ratio cataclysmic variables driven by apsidal disk precession
Rebecca G. Martin, Stephen H. Lubow, David Vallet +1
Previously it has been assumed that a cataclysmic variable (CV) disk can only become eccentric and display superhumps if the 3:1 resonance is located within the disk. This requires…
Relativistic Effects on Circumbinary Orbit Stability
Gonzalo C. de Elía, Macarena Zanardi, Rebecca G. Martin
With n-body simulations and analytic approximations we study the dynamics and stability of low eccentricity misaligned test particles around binary systems with varying mass fracti…
Negative superhumps in cataclysmic variables driven by retrograde apsidal disk precession
David Vallet, Rebecca G. Martin, Stephen H. Lubow +1
Negative superhumps are photometric modulations in cataclysmic variables with periods slightly shorter than the orbital period. They are usually attributed to retrograde nodal prec…
Formation of super-Earths around low-mass stars: evolution of an icy dead zone
Danilo A. Arturo Rodriguez, Rebecca G. Martin
Exoplanet observations show that close-in super-Earths are more common around M-dwarfs than around solar mass stars. Since the snow line in a protoplanetary disc plays a crucial ro…
Primordial planet spin driven by boundary layer effects in a decretion disc
Rebecca G. Martin, Stephen H. Lubow, David Vallet +4
Accretion of material from a protoplanetary disc on to a forming giant planet can spin the planet up to close to its breakup rate, , where $M_{…
Planet-disc interactions around eccentric binaries and misaligned ring formation
Rebecca G. Martin, Stephen H. Lubow
We explore the evolution of a giant planet that interacts with a circumbinary disc that orbits a misaligned binary by means of analytic models and hydrodynamical simulations. Plane…
The fraction of polar aligned circumbinary disks
Ted M. Johnson, Rebecca G. Martin, Stephen Lepp +1
Circumbinary gas disks that are misaligned to the binary orbital plane evolve toward either a coplanar or a polar-aligned configuration with respect to the binary host. The preferr…
Excitation of post-AGB Star Binary Eccentricity by Massive Polar-Aligned Circumbinary Disks
Shunquan Huang, Rebecca G. Martin, Stephen H. Lubow
Many post-AGB star binaries are observed to have relatively high orbital eccentricities (up to 0.6). Recently, AC Her was observed to have a polar-aligned circumbinary disk. We per…
Disc breaking through forced eccentricity growth
Madeline Overton, Rebecca G. Martin, Stephen H. Lubow +1
Motivated by misaligned discs observed in eccentric orbit Be/X-ray binaries, we examine the evolution of a retrograde disc around one component of an eccentric binary with hydrodyn…
Polar circumtriple planets and disks around misaligned hierarchical triple stars
Stephen Lepp, Rebecca G. Martin, Stephen H. Lubow
Observations of hierarchical triple star systems show that misalignments are common both between the angular momentum vector of the inner binary and the outer companion orbit, and…
Formation of Be star decretion discs through boundary layer effects
Rebecca G. Martin, Stephen H. Lubow, David Vallet +3
Be stars are rapidly rotating, with angular frequency around of their Keplerian break up frequency, as a result of significant accretion during the earlier stellar evolut…
Observational Signatures of a Previous Dynamical Instability in Multi-planet M-Dwarf Systems
Anna C. Childs, Alexa P. S. Hua, Rebecca G. Martin +2
We identify observational signatures suggesting a history of dynamical instability in 26 out of 34 M-dwarf multi-planet systems containing no large planets. These systems may have…
Shedding light on the origin of the broken misaligned circumtriple disk around GW Ori
Jeremy L. Smallwood, Stephen H. Lubow, Rebecca G. Martin +1
We revisit the origin of the observed misaligned rings in the circumtriple disk around GW Ori. Previous studies appeared to disagree on whether disk breaking is caused by the diffe…
Polar orbits around the newly formed Earth-Moon binary system
Stephen Lepp, Rebecca G. Martin, Stanley A. Baronett
We examine the dynamics and stability of circumbinary particles orbiting around the Earth-Moon binary system. The moon formed close to the Earth (semi-major axis $a_{EM}\approx 3\,…
On the origin of polar planets around single stars
Cheng Chen, Stanley A. Baronett, C. J. Nixon +1
The Rossiter-McLaughlin effect measures the misalignment between a planet's orbital plane and its host star's rotation plane. Around 10 of planets exhibit misalignments in the…
Decretion disc size in Be/X-ray binaries depends upon the disc aspect ratio
Rebecca G. Martin, Stephen H. Lubow, Philip J. Armitage +1
With three-dimensional hydrodynamical simulations we show that the size of the decretion disc and the structure of the accretion flow onto the neutron star in a Be/X-ray binary str…
Inclination instability of circumbinary planets
Stephen H. Lubow, Anna C. Childs, Rebecca G. Martin
We analyze a tilt instability of the orbit of an outer planet in a two planet circumbinary system that we recently reported. The binary is on an eccentric orbit and the inner circu…
Relativistic Effects on Circumbinary Disk Evolution: Breaking the Polar Alignment around Eccentric Black Hole Binary Systems
Anna C. Childs, Rebecca G. Martin, C. J. Nixon +4
We study the effects of general relativity (GR) on the evolution and alignment of circumbinary disks around binaries on all scales. We implement relativistic apsidal precession of…
Retrograde discs around one component of a binary are unstable to tilting
Madeline Overton, Rebecca G. Martin, Stephen H. Lubow +1
With hydrodynamic simulations we show that a coplanar disc around one component of a binary can be unstable to global tilting when the disc orbits in a retrograde direction relativ…
Mergers of black hole binaries driven by misaligned circumbinary discs
Rebecca G. Martin, Stephen Lepp, Bing Zhang +2
With hydrodynamical simulations we examine the evolution of a highly misaligned circumbinary disc around a black hole binary including the effects of general relativity. We show th…
Black hole mergers driven by a captured low-mass companion
Stephen Lepp, Rebecca G. Martin, Bing Zhang
Increased eccentricity of a black hole binary leads to reduced merger times. With n-body simulations and analytic approximations including the effects of general relativity (GR), w…
Warps and Breaks in Circumbinary Discs
Ian Rabago, Zhaohuan Zhu, Stephen Lubow +1
Disc warping, and possibly disc breaking, has been observed in protoplanetary discs around both single and multiple stars. Large warps can break the disc, producing multiple observ…