Rebecca Nealon
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View article: Evidence for Supermassive Black Hole Binaries
Evidence for Supermassive Black Hole Binaries Open
We review the state of the evidence for the existence and observational appearance of supermassive black hole binaries. Such objects are expected from standard hierarchical galaxy evolution to form after two galaxies, each containing a sup…
View article: Leading and trailing spiral arms in a nearly broken protoplanetary disc
Leading and trailing spiral arms in a nearly broken protoplanetary disc Open
We perform three-dimensional smoothed particle hydrodynamics simulations to investigate the formation of spiral arms in misaligned circumbinary discs. In a nearly broken disc, the misaligned inner and outer discs interact at two nodes, lau…
View article: Tracing the formation and migration history: molecular signatures in the atmosphere of misaligned hot Jupiter WASP-94 A b using <i>JWST</i> NIRSpec/G395H
Tracing the formation and migration history: molecular signatures in the atmosphere of misaligned hot Jupiter WASP-94 A b using <i>JWST</i> NIRSpec/G395H Open
The discovery of hot Jupiters that orbit very close to their host stars has long challenged traditional models of planetary formation and migration. Characterizing their atmospheric composition – mainly in the form of the carbon-to-oxygen …
View article: Disc–planet misalignment from an unstable triple system: IRAS04125
Disc–planet misalignment from an unstable triple system: IRAS04125 Open
The IRAS01425+2902 wide binary system was recently reported to have both a young planet and a puzzling geometric arrangement, where the planet and binary both orbit edge-on, but misaligned by $60 ^{\circ }$ to the circumprimary disc. This …
View article: Modelling a transiting circumbinary disc in the HD98800 system
Modelling a transiting circumbinary disc in the HD98800 system Open
We present synthetic optical light curves of the hierarchical HD 98800 quadruple system over a decade-long period when the circumbinary disc encircling the system’s B binary is expected to eclipse the light from the A binary. We produce an…
View article: Modelling a Transiting Circumbinary Disc in the HD98800 System
Modelling a Transiting Circumbinary Disc in the HD98800 System Open
We present synthetic optical light curves of the hierarchical HD98800 quadruple system over a decade-long period when the circumbinary disc encircling the system's B binary is expected to eclipse the light from the A binary. We produce and…
View article: Shedding Light on the Origin of the Broken Misaligned Circumtriple Disk around GW Ori
Shedding Light on the Origin of the Broken Misaligned Circumtriple Disk around GW Ori Open
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 differential precession driven in the disk by the triple star sy…
View article: Adaptive particle refinement for compressible smoothed particle hydrodynamics
Adaptive particle refinement for compressible smoothed particle hydrodynamics Open
We introduce adaptive particle refinement for compressible smoothed particle hydrodynamics (SPH). SPH calculations have the natural advantage that resolution follows mass, but this is not always optimal. Our implementation allows the user …
View article: Shedding light on the origin of the broken misaligned circumtriple disk around GW Ori
Shedding light on the origin of the broken misaligned circumtriple disk around GW Ori Open
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 differential precession driven in the disk by the triple star sy…
View article: Observational Signatures of Dust Traffic Jams in Polar-aligning Circumbinary Disks
Observational Signatures of Dust Traffic Jams in Polar-aligning Circumbinary Disks Open
Misaligned circumbinary disks will produce dust traffic jams during alignment or antialignment to the binary orbital plane. We conduct a hydrodynamical simulation of an initially misaligned circumbinary disk undergoing polar alignment with…
View article: Observational Signatures of Dust Traffic Jams in Polar-Aligning Circumbinary Disks
Observational Signatures of Dust Traffic Jams in Polar-Aligning Circumbinary Disks Open
Misaligned circumbinary disks will produce dust traffic jams during alignment or anti-alignment to the binary orbital plane. We conduct a hydrodynamical simulation of an initially misaligned circumbinary disk undergoing polar alignment wit…
View article: Polar alignment of a dusty circumbinary disc–II. Application to 99 Herculis
Polar alignment of a dusty circumbinary disc–II. Application to 99 Herculis Open
We investigate the formation of dust traffic jams in polar-aligning circumbinary discs. In our first paper, we found as the circumbinary disc evolves towards a polar configuration perpendicular to the binary orbital plane, the differential…
View article: Polar alignment of a dusty circumbinary disc -- II. Application to 99 Herculis
Polar alignment of a dusty circumbinary disc -- II. Application to 99 Herculis Open
We investigate the formation of dust traffic jams in polar-aligning circumbinary discs. In our first paper, we found as the circumbinary disc evolves towards a polar configuration perpendicular to the binary orbital plane, the differential…
View article: Short-lived gravitational instability in isolated irradiated discs
Short-lived gravitational instability in isolated irradiated discs Open
Irradiation from the central star controls the temperature structure in protoplanetary discs. Yet simulations of gravitational instability typically use models of stellar irradiation with varying complexity, or ignore it altogether, assumi…
View article: Adaptive particle refinement for compressible smoothed particle hydrodynamics
Adaptive particle refinement for compressible smoothed particle hydrodynamics Open
We introduce adaptive particle refinement for compressible smoothed particle hydrodynamics (SPH). SPH calculations have the natural advantage that resolution follows mass, but this is not always optimal. Our implementation allows the user …
View article: Short-Lived Gravitational Instability in Isolated Irradiated Discs
Short-Lived Gravitational Instability in Isolated Irradiated Discs Open
Irradiation from the central star controls the temperature structure in protoplanetary discs. Yet simulations of gravitational instability typically use models of stellar irradiation with varying complexity, or ignore it altogether, assumi…
View article: Polar alignment of a dusty circumbinary disc – I. Dust ring formation
Polar alignment of a dusty circumbinary disc – I. Dust ring formation Open
We investigate the formation of dust traffic jams in polar-aligning circumbinary discs. We use 3D smoothed particle hydrodynamical simulations of both gas and dust to model an initially highly misaligned circumbinary disc around an eccentr…
View article: Polar alignment of a dusty circumbinary disc -- I. Dust ring formation
Polar alignment of a dusty circumbinary disc -- I. Dust ring formation Open
We investigate the formation of dust traffic jams in polar-aligning circumbinary discs. We use 3D smoothed particle hydrodynamical simulations of both gas and dust to model an initially highly misaligned circumbinary disc around an eccentr…
View article: V892 Tau: A tidally perturbed circumbinary disc in a triple stellar system
V892 Tau: A tidally perturbed circumbinary disc in a triple stellar system Open
Context . V892 Tau is a young binary star surrounded by a circumbinary disc that shows hints of an interaction with the low-mass nearby star V892 Tau NE. Aims . The goal of this paper is to constrain the orbit of V892 Tau NE and to determi…
View article: V892 Tau: A tidally perturbed circumbinary disc in a triple stellar system
V892 Tau: A tidally perturbed circumbinary disc in a triple stellar system Open
V892 Tau is a young binary star surrounded by a circumbinary disc which show hints of interaction with the low-mass nearby star V892 Tau NE. The goal of this paper is to constrain the orbit of V892 Tau NE and to determine the resulting cir…
View article: Atmospheric characterization and tighter constraints on the orbital misalignment of WASP-94 A b with HARPS
Atmospheric characterization and tighter constraints on the orbital misalignment of WASP-94 A b with HARPS Open
We present high spectral resolution observations of the hot Jupiter WASP-94 A b using the HARPS instrument on ESO’s 3.6-m telescope in La Silla, Chile. We probed for Na absorption in its atmosphere as well as constrained the previously rep…
View article: Atmospheric characterisation and tighter constraints on the orbital misalignment of WASP-94 A b with HARPS
Atmospheric characterisation and tighter constraints on the orbital misalignment of WASP-94 A b with HARPS Open
We present high spectral resolution observations of the hot Jupiter WASP-94 A b using the HARPS instrument on ESO's 3.6m telescope in La Silla, Chile. We probed for Na absorption in its atmosphere as well as constrained the previously repo…
View article: The orbit of HD 142527 B is too compact to explain many of the disc features
The orbit of HD 142527 B is too compact to explain many of the disc features Open
HD 142527 A is a young and massive Herbig Ae/Be star surrounded by a highly structured disc. The disc shows numerous morphological structures, such as spiral arms, a horseshoe region of dust emission, a set of shadows cast by an inner disc…
View article: The role of drag and gravity on dust concentration in a gravitationally unstable disc
The role of drag and gravity on dust concentration in a gravitationally unstable disc Open
We carry out three-dimensional smoothed particle hydrodynamics simulations to study the role of gravitational and drag forces on the concentration of large dust grains (St > 1) in the spiral arms of gravitationally unstable protoplaneta…
View article: The Role of Drag and Gravity on Dust Concentration in a Gravitationally Unstable Disc
The Role of Drag and Gravity on Dust Concentration in a Gravitationally Unstable Disc Open
We carry out three dimensional smoothed particle hydrodynamics simulations to study the role of gravitational and drag forces on the concentration of large dust grains (St > 1) in the spiral arms of gravitationally unstable protoplanetary …
View article: The orbit of HD 142527 B is too compact to explain many of the disc features
The orbit of HD 142527 B is too compact to explain many of the disc features Open
Context . HD 142527 A is a young and massive Herbig Ae/Be star surrounded by a highly structured disc. The disc shows numerous morphological structures, such as spiral arms, a horseshoe region of dust emission, a set of shadows cast by an …
View article: WInDI: a Warp-Induced Dust Instability in protoplanetary discs
WInDI: a Warp-Induced Dust Instability in protoplanetary discs Open
We identify a new dust instability that occurs in warped discs. The instability is caused by the oscillatory gas motions induced by the warp in the bending wave regime. We first demonstrate the instability using a local 1D (vertical) toy m…
View article: WInDI: a Warp-Induced Dust Instability in protoplanetary discs
WInDI: a Warp-Induced Dust Instability in protoplanetary discs Open
We identify a new dust instability that occurs in warped discs. The instability is caused by the oscillatory gas motions induced by the warp in the bending wave regime. We first demonstrate the instability using a local 1D (vertical) toy m…
View article: Formation of misaligned second-generation discs through fly-by encounters
Formation of misaligned second-generation discs through fly-by encounters Open
Observations reveal protoplanetary discs being perturbed by fly-by candidates. We simulate a scenario where an unbound perturber, i.e. a fly-by, undergoes an inclined grazing encounter, capturing material and forming a second-generation pr…
View article: Formation of misaligned second-generation discs through flyby encounters
Formation of misaligned second-generation discs through flyby encounters Open
Observations reveal protoplanetary discs being perturbed by flyby candidates. We simulate a scenario where an unbound perturber, i.e., a flyby, undergoes an inclined grazing encounter, capturing material and forming a second-generation pro…