431 citations · 1.2k across the 44 of their papers we have counts for
30 papers · 1 filter
Triggered Fragmentation in Self-Gravitating Protoplanetary discs: Cooling, Mass Movement and Instability
Pratishtha Rawat, Farzana Meru, Rebecca Nealon
Previous three-dimensional hydrodynamical simulations of gravitationally unstable discs have shown that the formation of a single fragment can trigger the formation of subsequent f…
Leading & Trailing Spiral Arms in a Nearly Broken Protoplanetary Disc
Sahl Rowther, Rebecca Nealon, Richard Alexander +1
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 m…
Tracing the formation and migration history: molecular signatures in the atmosphere of misaligned hot Jupiter WASP-94Ab using JWST NIRSpec/G395H
Eva-Maria Ahrer, Siddharth Gandhi, Lili Alderson +12
The discovery of hot Jupiters that orbit very close to their host stars has long challenged traditional models of planetary formation and migration. Characterising their atmospheri…
Disc-planet misalignment from an unstable triple system: IRAS04125
Rebecca Nealon, Jeremy L. Smallwood, Hossam Aly +5
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 mi…
Modelling a Transiting Circumbinary Disc in the HD98800 System
Amena Faruqi, Grant Kennedy, Rebecca Nealon +1
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 expe…
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…
Observational Signatures of Dust Traffic Jams in Polar-Aligning Circumbinary Disks
Jeremy L. Smallwood, Rebecca Nealon, Hsi-Wei Yen +4
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…
Polar alignment of a dusty circumbinary disc -- II. Application to 99 Herculis
Jeremy L. Smallwood, Min-Kai Lin, Rebecca Nealon +2
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…
Short-Lived Gravitational Instability in Isolated Irradiated Discs
Sahl Rowther, Daniel J. Price, Christophe Pinte +3
Irradiation from the central star controls the temperature structure in protoplanetary discs. Yet simulations of gravitational instability typically use models of stellar irradiati…
Polar alignment of a dusty circumbinary disc -- I. Dust ring formation
Jeremy L. Smallwood, Min-Kai Lin, Hossam Aly +2
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 init…
V892 Tau: A tidally perturbed circumbinary disc in a triple stellar system
Antoine Alaguero, Nicolás Cuello, François Ménard +8
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…
Atmospheric characterisation and tighter constraints on the orbital misalignment of WASP-94 A b with HARPS
E. Ahrer, J. V. Seidel, L. Doyle +10
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 i…
The Role of Drag and Gravity on Dust Concentration in a Gravitationally Unstable Disc
Sahl Rowther, Rebecca Nealon, Farzana Meru +5
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…
WInDI: a Warp-Induced Dust Instability in protoplanetary discs
Hossam Aly, Rebecca Nealon, Jean-François Gonzalez
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 de…
Formation of misaligned second-generation discs through flyby encounters
Jeremy L. Smallwood, Rebecca Nealon, Nicolás Cuello +2
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 encoun…
Continuing to Hide Signatures of Gravitational Instability in Protoplanetary Discs with Planets
Sahl Rowther, Rebecca Nealon, Farzana Meru
We carry out three dimensional smoothed particle hydrodynamics simulations to study the impact of planet-disc interactions on a gravitationally unstable protoplanetary disc. We fin…
Warping Away Gravitational Instabilities in Protoplanetary Discs
Sahl Rowther, Rebecca Nealon, Farzana Meru
We perform 3D SPH simulations of warped, non-coplanar gravitationally unstable discs to show that as the warp propagates through the self-gravitating disc, it heats up the disc ren…
Dust Traffic Jams in Inclined Circumbinary Protoplanetary Discs I. Morphology and Formation Theory
Hossam Aly, Jean-François Gonzalez, Rebecca Nealon +3
Gas and dust in inclined orbits around binaries experience precession induced by the binary gravitational torque. The difference in precession between gas and dust alters the radia…
GW Ori: circumtriple rings and planets
Jeremy L. Smallwood, Rebecca Nealon, Cheng Chen +4
GW Ori is a hierarchical triple star system with a misaligned circumtriple protoplanetary disc. Recent ALMA observations have identified three dust rings with a prominent gap at $1…
Chemical signatures of a warped protoplanetary disc
Alison K. Young, Richard Alexander, Catherine Walsh +3
Circumstellar discs may become warped or broken into distinct planes if there is a stellar or planetary companion with an orbit that is misaligned with respect to the disc. There i…
Formation of eccentric gas discs from sublimating or partially disrupted asteroids orbiting white dwarfs
David Trevascus, Daniel J. Price, Rebecca Nealon +3
Of the 21 known gaseous debris discs around white dwarfs, a large fraction of them display observational features that are well described by an eccentric distribution of gas. In th…
HD 143006: circumbinary planet or misaligned disc?
G. Ballabio, R. Nealon, R. D. Alexander +3
Misalignments within protoplanetary discs are now commonly observed, and features such as shadows in scattered light images indicate departure from a co-planar geometry. VLT/SPHERE…
Hiding Signatures of Gravitational Instability in Protoplanetary Discs with Planets
Sahl Rowther, Farzana Meru, Grant M. Kennedy +2
We carry out three dimensional SPH simulations to show that a migrating giant planet strongly suppresses the spiral structure in self-gravitating discs. We present mock ALMA contin…
Spirals, shadows & precession in HD 100453 -- II. The hidden companion
Rebecca Nealon, Nicolás Cuello, Jean-François Gonzalez +5
The protoplanetary disc HD 100453 exhibits a curious combination of spirals, shadows and a relative misalignment between the observed outer disc and inferred inner disc. This disc…