Lisa Wölfer
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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: 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: Ice Sublimation in the Dynamic HD 100453 Disk Reveals a Rich Reservoir of Inherited Complex Organics
Ice Sublimation in the Dynamic HD 100453 Disk Reveals a Rich Reservoir of Inherited Complex Organics Open
Protoplanetary disks around luminous young A-type stars are prime observational laboratories to determine the abundances of complex organic molecules (COMs) present during planet formation. In contrast to their lower stellar mass counterpa…
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. VII. Benchmarking Hydrodynamics and Radiative Transfer Codes
exoALMA. VII. Benchmarking Hydrodynamics and Radiative Transfer Codes Open
Forward modeling is often used to interpret substructures observed in protoplanetary disks. To ensure the robustness and consistency of the current forward-modeling approach from the community, we conducted a systematic comparison of vario…
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. 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. 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. 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: 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 extremely high spatial and spectral resolution observations at u…
View article: exoALMA. X. channel maps reveal complex $^{12}$CO abundance distributions and a variety of kinematic structures with evidence for embedded planets
exoALMA. X. channel maps reveal complex $^{12}$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 fai…
View article: Chemistry across dust and gas gaps in protoplanetary disks: modelling the co-spatial molecular rings in the HD 100546 disk
Chemistry across dust and gas gaps in protoplanetary disks: modelling the co-spatial molecular rings in the HD 100546 disk Open
High-resolution observations show that typically both the dust and the gas in nearby extended protoplanetary disks are structured, possibly related to radial and azimuthal variations in the disk density and/or chemistry. The aim of this wo…
View article: Chemistry across dust and gas gaps in protoplanetary disks
Chemistry across dust and gas gaps in protoplanetary disks Open
Context. Nearby extended protoplanetary disks are commonly marked by prominent rings in dust emission, possibly carved by forming planets. High-resolution observations show that both the dust and the gas are structured. These molecular str…
View article: The Disc Miner
The Disc Miner Open
Detecting planets in the early stages of formation is key to reconstructing the history and diversity of fully developed planetary systems. The aim of this work is to identify potential signatures from planet-disc interaction in the circum…
View article: The Disc Miner II: Revealing Gas substructures and Kinematic signatures from Planet-disc interaction through line profile analysis
The Disc Miner II: Revealing Gas substructures and Kinematic signatures from Planet-disc interaction through line profile analysis Open
[Abridged] The aim of this work is to identify potential signatures from planet-disc interaction in the circumstellar discs around MWC 480, HD 163296, AS 209, IM Lup, and GM Aur, through the study of molecular lines observed as part of the…
View article: Kinematics and brightness temperatures of transition discs
Kinematics and brightness temperatures of transition discs Open
Context. In recent years, high-angular-resolution observations of the dust and gas content in circumstellar discs have revealed a variety of morphologies, naturally triggering the question of whether these substructures are driven by formi…
View article: Kinematics and brightness temperatures of transition discs -- A survey of gas substructures as seen with ALMA
Kinematics and brightness temperatures of transition discs -- A survey of gas substructures as seen with ALMA Open
In recent years, high-angular-resolution observations of the dust and gas in circumstellar discs have revealed a variety of morphologies, naturally triggering the question of whether these substructures are driven by forming planets. While…
View article: Probing inner and outer disk misalignments in transition disks: constraints from VLTI/GRAVITY and ALMA observations
Probing inner and outer disk misalignments in transition disks: constraints from VLTI/GRAVITY and ALMA observations Open
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