John D. Ilee
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View article: Methanol emission tracing ice chemistry and dust evolution in the TW Hya protoplanetary disk
Methanol emission tracing ice chemistry and dust evolution in the TW Hya protoplanetary disk Open
Methanol (CH$_{3}$OH) ice is abundant in space and is a key feedstock for seeding chemical complexity in interstellar and circumstellar environments. Despite its ubiquity, gas-phase methanol has only been detected in one disk around a Sola…
View article: exoALMA. XVIII. Interpreting Large-scale Kinematic Structures as Moderate Warping
exoALMA. XVIII. Interpreting Large-scale Kinematic Structures as Moderate Warping Open
The exoALMA program gave an unprecedented view of the complex kinematics of protoplanetary disks, revealing diverse structures that remain poorly understood. We show that moderate disk warps (∼0 5–2°) can naturally explain many of th…
View article: SO Emission in the Dynamically Perturbed Protoplanetary Disks around CQ Tau and MWC 758
SO Emission in the Dynamically Perturbed Protoplanetary Disks around CQ Tau and MWC 758 Open
We report the serendipitous detection of the SO J N = 6 5 –5 4 (219.949 GHz) rotational transition in archival Atacama Large Millimeter/submillimeter Array observations of the spiral hosting protoplanetary disks around CQ Tau (with ≈4.9 σ …
View article: exoALMA. XVIII. Interpreting large scale kinematic structures as moderate warping
exoALMA. XVIII. Interpreting large scale kinematic structures as moderate warping Open
The exoALMA program gave an unprecedented view of the complex kinematics of protoplanetary disks, revealing diverse structures that remain poorly understood. We show that moderate disk warps ($\sim 0.5-2^\circ$) can naturally explain many …
View article: exoALMA. XVII. Characterizing the Gas Dynamics around Dust Asymmetries
exoALMA. XVII. Characterizing the Gas Dynamics around Dust Asymmetries Open
The key planet-formation processes in protoplanetary disks remain an active matter of research. One promising mechanism to radially and azimuthally trap millimeter-emitting dust grains, enabling them to concentrate and grow into planetesim…
View article: exoALMA. V. Gaseous Emission Surfaces and Temperature Structures
exoALMA. V. Gaseous Emission Surfaces and Temperature Structures Open
An analysis of the gaseous component in protoplanetary disks can inform us about their thermal and physical structure, chemical composition, and kinematic properties, all of which are crucial for understanding various processes within the …
View article: exoALMA. XVI. Predicting Signatures of Large-scale Turbulence in Protoplanetary Disks
exoALMA. XVI. Predicting Signatures of Large-scale Turbulence in Protoplanetary Disks Open
Turbulent gas motions drive planet formation and protoplanetary disk evolution. However, empirical constraints on turbulence are scarce, halting our understanding of its nature. Resolving signatures of the large-scale perturbations driven …
View article: exoALMA. I. Science Goals, Project Design, and Data Products
exoALMA. I. Science Goals, Project Design, and Data Products Open
Planet formation is a hugely dynamic process requiring the transport, concentration, and assimilation of gas and dust to form the first planetesimals and cores. With access to observations with extremely high spatial and spectral resolutio…
View article: exoALMA. III. Line-intensity Modeling and System Property Extraction from Protoplanetary Disks
exoALMA. III. Line-intensity Modeling and System Property Extraction from Protoplanetary Disks Open
The ALMA large program exoALMA offers a unique window into the three-dimensional physical and dynamical properties of 15 circumstellar disks where planets may be actively forming. Here, we present an analysis methodology to map the gas dis…
View article: exoALMA. II. Data Calibration and Imaging Pipeline
exoALMA. II. Data Calibration and Imaging Pipeline Open
The exoALMA Large Program was designed to search for subtle kinematic deviations from Keplerian motion, indicative of embedded planets, in high-angular-resolution and high-spectral-resolution Band 7 observations of 12 CO, 13 CO, and CS emi…
View article: exoALMA. XIV. Gas Surface Densities in the RX J1604.3−2130 A Disk from Pressure-broadened CO Line Wings
exoALMA. XIV. Gas Surface Densities in the RX J1604.3−2130 A Disk from Pressure-broadened CO Line Wings Open
Gas surface density is one of the most relevant physical quantities in protoplanetary disks. However, its precise measurement remains highly challenging due to the lack of a direct tracer. In this study, we report the spatially resolved de…
View article: exoALMA. XVI. Predicting Signatures of Large-scale Turbulence in Protoplanetary Disks
exoALMA. XVI. Predicting Signatures of Large-scale Turbulence in Protoplanetary Disks Open
Turbulent gas motions drive planet formation and protoplanetary disk evolution. However, empirical constraints on turbulence are scarce, halting our understanding of its nature. Resolving signatures of the large-scale perturbations driven …
View article: exoALMA. XI. ALMA Observations and Hydrodynamic Models of LkCa 15: Implications for Planetary Mass Companions in the Dust Continuum Cavity
exoALMA. XI. ALMA Observations and Hydrodynamic Models of LkCa 15: Implications for Planetary Mass Companions in the Dust Continuum Cavity Open
In the past decade, the Atacama Large Millimeter/submillimeter Array (ALMA) has revealed a plethora of substructures in the disks surrounding young stars. These substructures have several proposed formation mechanisms, with one leading the…
View article: exoALMA II: Data Calibration and Imaging Pipeline
exoALMA II: Data Calibration and Imaging Pipeline Open
The exoALMA Large Program was designed to search for subtle kinematic deviations from Keplerian motion, indicative of embedded planets, in high angular and spectral resolution Band 7 observations of $^{12}$CO, $^{13}$CO and CS emission fro…
View article: exoALMA. VI. Rotating under Pressure: Rotation Curves, Azimuthal Velocity Substructures, and Gas Pressure Variations
exoALMA. VI. Rotating under Pressure: Rotation Curves, Azimuthal Velocity Substructures, and Gas Pressure Variations Open
The bulk motion of the gas in protoplanetary disks around newborn stars is nearly Keplerian. By leveraging the high angular and spectral resolution of the Atacama Large Millimeter/submillimeter Array (ALMA), we can detect small-scale veloc…
View article: exoALMA. XV. Interpreting the Height of CO Emission Layer
exoALMA. XV. Interpreting the Height of CO Emission Layer Open
The availability of exquisite data and the development of new analysis techniques have enabled the study of emitting heights in protoplanetary disks. In this paper, we introduce a simple model linking the emitting height of CO to the disk …
View article: exoALMA. XII. Weighing and Sizing exoALMA Disks with Rotation Curve Modelling
exoALMA. XII. Weighing and Sizing exoALMA Disks with Rotation Curve Modelling Open
The exoALMA large program offers a unique opportunity to investigate the fundamental properties of protoplanetary disks, such as their masses and sizes, providing important insights into the mechanism responsible for the transport of angul…
View article: exoALMA. VIII. Probabilistic Moment Maps and Data Products Using Nonparametric Linear Models
exoALMA. VIII. Probabilistic Moment Maps and Data Products Using Nonparametric Linear Models Open
Extracting robust inferences on physical quantities from disk kinematics measured from Doppler-shifted molecular line emission is challenging due to the data’s size and complexity. In this paper, we develop a flexible linear model of the i…
View article: exoALMA. IV. Substructures, Asymmetries, and the Faint Outer Disk in Continuum Emission
exoALMA. IV. Substructures, Asymmetries, and the Faint Outer Disk in Continuum Emission Open
The exoALMA Large Program targeted a sample of 15 disks to study gas dynamics within these systems, and these observations simultaneously produced continuum data at 0.9 mm (331.6 GHz) with exceptional surface brightness sensitivity at high…
View article: exoALMA. X. Channel Maps Reveal Complex <sup>12</sup>CO Abundance Distributions and a Variety of Kinematic Structures with Evidence for Embedded Planets
exoALMA. X. Channel Maps Reveal Complex <sup>12</sup>CO Abundance Distributions and a Variety of Kinematic Structures with Evidence for Embedded Planets Open
We analyze the 12 CO J = 3–2 data cubes of the disks in the exoALMA program. 13/15 disks reveal a variety of kinematic substructures in individual channels: large-scale arcs or spiral arms, localized velocity kinks, and/or multiple faints …
View article: exoALMA XI: ALMA Observations and Hydrodynamic Models of LkCa 15: Implications for Planetary Mass Companions in the Dust Continuum Cavity
exoALMA XI: ALMA Observations and Hydrodynamic Models of LkCa 15: Implications for Planetary Mass Companions in the Dust Continuum Cavity Open
In the past decade, the Atacama Large Millimeter/submillimeter Array (ALMA) has revealed a plethora of substructures in the disks surrounding young stars. These substructures have several proposed formation mechanisms, with one leading the…
View article: exoALMA. XIII. Gas Masses from N<sub>2</sub>H<sup>+</sup> and C<sup>18</sup>O: A Comparison of Measurement Techniques for Protoplanetary Gas Disk Masses
exoALMA. XIII. Gas Masses from N<sub>2</sub>H<sup>+</sup> and C<sup>18</sup>O: A Comparison of Measurement Techniques for Protoplanetary Gas Disk Masses Open
The gas masses of protoplanetary disks are important but elusive quantities. In this work we present new Atacama Large Millimeter/submillimeter Array (ALMA) observations of N 2 H + (3–2) for 11 exoALMA disks. N 2 H + is a molecule sensitiv…
View article: exoALMA. IX. Regularized Maximum Likelihood Imaging of Non-Keplerian Features
exoALMA. IX. Regularized Maximum Likelihood Imaging of Non-Keplerian Features Open
The planet-hunting Atacama Large Millimeter/submillimeter Array (ALMA) large program exoALMA observed 15 protoplanetary disks at angular resolution and ∼100 m s −1 spectral resolution, characterizing disk structures and kinematics…
View article: ExoALMA XIII. gas masses from N2H+ and C18O: a comparison of protoplanetary gas disk mass measurement techniques
ExoALMA XIII. gas masses from N2H+ and C18O: a comparison of protoplanetary gas disk mass measurement techniques Open
The gas masses of protoplanetary disks are important but elusive quantities. In this work we present new ALMA observations of N2H+ (3-2) for 11 exoALMA disks. N2H+ is a molecule sensitive to CO freeze-out and has recently been shown to sig…
View article: ALMA Reveals Thermal and Nonthermal Desorption of Methanol Ice in the HD 100546 Protoplanetary Disk
ALMA Reveals Thermal and Nonthermal Desorption of Methanol Ice in the HD 100546 Protoplanetary Disk Open
Methanol (CH 3 OH) and formaldehyde (H 2 CO) are chemically coupled organic molecules proposed to act as an intermediate step between simple molecules and more complex prebiotic compounds. Their abundance distributions across disks regulat…
View article: Characterizing the Multiple Protostellar System VLA 1623-2417 with JWST, ALMA, and VLA: Outflow Origins, Dust Growth, and an Unsettled Disk
Characterizing the Multiple Protostellar System VLA 1623-2417 with JWST, ALMA, and VLA: Outflow Origins, Dust Growth, and an Unsettled Disk Open
Utilizing the James Webb Space Telescope (JWST), the Atacama Large Millimeter/submillimeter Array (ALMA), and the Very Large Array (VLA), we present high angular resolution (0 06–0 42), multiwavelength (4 μ m–3 cm) observations…
View article: Characterising the multiple protostellar system VLA 1623-2417 with JWST, ALMA and VLA: outflow origins, dust growth and an unsettled disk
Characterising the multiple protostellar system VLA 1623-2417 with JWST, ALMA and VLA: outflow origins, dust growth and an unsettled disk Open
Utilising JWST, ALMA and the VLA we present high angular resolution (0.06''- 0.42''), multi-wavelength (4 micron - 3cm) observations of the VLA 1623-2417 protostellar system to characterise the origin, morphology and, properties of the con…
View article: Unveiling accretion in the massive young stellar object G033.3891. Spatial and kinematic constraints from the CO bandhead emission
Unveiling accretion in the massive young stellar object G033.3891. Spatial and kinematic constraints from the CO bandhead emission Open
The inner parts of the hot discs surrounding massive young stellar objects (MYSOs) are still barely explored due to observational limitations in terms of angular resolution, scarcity of diagnostic lines, and the embedded and rare nature of…
View article: Unveiling accretion in the massive YSO G033.3891. Spatial and kinematic constraints from the CO bandhead emission
Unveiling accretion in the massive YSO G033.3891. Spatial and kinematic constraints from the CO bandhead emission Open
The inner parts of the hot discs surrounding massive young stellar objects (MYSOs) are still barely explored due to observational limitations in terms of angular resolution, scarcity of diagnostic lines and the embedded and rare nature of …
View article: The UK Submillimetre and Millimetre Astronomy Roadmap 2024
The UK Submillimetre and Millimetre Astronomy Roadmap 2024 Open
In this Roadmap, we present a vision for the future of submillimetre and millimetre astronomy in the United Kingdom over the next decade and beyond. This Roadmap has been developed in response to the recommendation of the Astronomy Advisor…