A5015609465- Astrophysics and Star Formation Studies
- Molecular Spectroscopy and Structure
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Atmospheric Ozone and Climate
- Phase Equilibria and Thermodynamics
- Botanical Research and Chemistry
- Advanced Combustion Engine Technologies
- Advanced Fiber Laser Technologies
- Astrophysical Phenomena and Observations
- Spectroscopy and Laser Applications
- SAS software applications and methods
Leiden University
2022-2024
European Southern Observatory
2021-2024
University of Chile
2020-2022
Bayer (Germany)
2021
Context . Constraining turbulence in disks is key to understanding their evolution via the transport of angular momentum. Measurements high remain elusive, and methods for estimating mostly rely on complex radiative transfer models data. Using disk emission from IM Lup, a source proposed be undergoing magneto-rotational instabilities (MRIs) possibly have values upper layers, we present new way directly measuring without need or thermochemical models. Aims Through characterization CN C 2 H...
Recent multi-wavelength ALMA observations of the protoplanetary disk orbiting around Elias 2-27 revealed a two armed spiral structure. The observed morphology together with young age star and disk-to-star mass ratio estimated from dust continuum emission make this system perfect laboratory to investigate role self-gravity in early phases formation. This is particularly interesting if we consider that gravitational instabilities could be fundamental first step for formation planetesimals...
We aim to directly trace the vertical location of emitting surface multiple molecular tracers in protoplanetary disks. Our sample disks includes Elias 2-27, WaOph 6 and sources targeted by MAPS ALMA Large Program. The set molecules studied include CO isotopologues various transitions, HCN, CN, H2CO, HCO+, C2H c-C3H2. region is determined from channel maps, implementing accurate masking emission recover even at large radial distances star for low-SNR lines. layer obtained 4-10 lines each...
[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 study molecular lines observed as part ALMA large program MAPS. Extended localised perturbations velocity, line width, intensity have been analysed jointly using DISCMINER modelling framework, three bright CO lines, 12CO, 13CO, C18O $J=2-1$, provide a comprehensive summary kinematic column density...
Abstract High-spatial-resolution observations of CO isotopologue line emission in protoplanetary disks at mid-inclinations (≈30°–75°) allow us to characterize the gas structure detail, including radial and vertical substructures, surface heights their dependencies on source characteristics, disk temperature profiles. By combining a suite isotopologues, we can map two-dimensional ( r , z ) from upper atmosphere, as traced by CO, near midplane, probed less abundant isotopologues. Here, present...
Observations with the Atacama Large Millimeter/Submillimeter array (ALMA) have dramatically improved our understanding of site exoplanet formation: protoplanetary discs. However, many basic properties these discs are not well-understood. The most fundamental is total disc mass, which sets mass budget for planet formation. Discs sufficiently high masses can excite gravitational instability and drive spiral arms that detectable ALMA . Although spirals been detected in observations dust , their...
[Abridged] Most disks observed at high angular resolution show substructures. Knowledge about the gas surface density and temperature is essential to understand these. The aim of this work constrain in two transition disks: LkCa15 HD 169142. We use new ALMA observations $^{13}$CO $J=6-5$ together with archival $J=2-1$ data $^{12}$CO, C$^{18}$O observationally density. Furthermore, we thermochemical code DALI model structure a typical disk. $6-5/2-1$ line ratio constrains emitting layers...
ABSTRACT ALMA observations of line emission from planet forming discs have demonstrated to be an excellent tool probe the internal disc kinematics, often revealing subtle effects related important dynamical processes occurring in them, such as turbulence, or presence planets, that can inferred pressure bumps perturbing gas motion, detection planetary wake. In particular, we recently shown for case massive Elias 2-27 how one use kind measure deviations Keplerianity induced by self-gravity,...
As the sample of mid-inclination disks with measured CO emission surfaces grows, a fundamental unanswered question is how these vertical profiles connect to their host properties. This project aims relate extent protoplanetary as traced by $^{12}$CO $2-1$ key stellar and physical parameters. In order produce result that applicable towards an observational analysis, we benchmark our results ALMA observations from nineteen disks. We grid disk models using physical-chemical code DALI, for...
Abstract Late infall events challenge the traditional view that planet formation occurs without external influence. Here we present deep Atacama Large Millimeter/submillimeter Array 12 CO J = 2–1 and SO N 5 6 –4 observations toward AB Aurigae (AB Aur), a Class II disk system with strong signs of gravitational instability ongoing formation. By applying Keplerian anti-Keplerian masks, separate disk-like non-disk-like motions CO, considering two outputs as “disk” “exo-disk” (out disk) emission...
Elias 2-27 is a young star that hosts an extended, bright and inclined disk of dust gas. The inclination extreme flaring the make ideal target to study vertical distribution molecules, particularly CN. We directly trace emission CN in compare it previously published CO isotopologue data. $N = 3-2$ analyzed two different transitions $J 7/2 - 5/2$ 5/2 3/2$, for which we detect hyperfine group transitions. location traced from channel maps, following geometrical methods have been used analyze...
Exoplanets form in protoplanetary accretion discs. The total disc mass is the most fundamental parameter, since it sets budget for planet formation. Although observations with Atacama Large Millimeter/Submillimeter array (ALMA) have dramatically increased our understanding of these discs, remains difficult to measure. If a sufficiency massive ($\gtrsim$ 10\% host star mass), can excite gravitational instability (GI). Recently, has been revealed that GI leaves kinematic imprints its presence...
Abstract To determine the origin of spiral structure observed in dust continuum emission Elias 2–27 we analyze multiwavelength ALMA data with a resolution ∼0.″2 (∼23 au) at 0.89, 1.3, and 3.3 mm. We also study kinematics disk 13 CO C 18 O observations J = 3–2 transition. The arm morphology is recovered all wavelengths observations, where measure contrast spectral index variations along arms detect subtle dust-trapping signatures. that from midplane cold interpret optical depth results as...
Herbig stars can be classified into group I and II depending on the shape of far-IR excess from spectral energy distribution. This separation may evolutionary related to vertical structure these disks. We aim determine emission height disks compare resulting extent both groups. ALMA Band 6 observations 12CO lines at sufficient velocity spatial resolution eight (four four sources) are used heights channel maps via geometrical methods developed in other works. find that all vertically extended...
Abstract The central star and its energetic radiation fields play a vital role in setting the vertical radial chemical structure of planet-forming disks. We present observations that, for first time, clearly reveal UV-irradiated surface protoplanetary disk. Specifically, we spatially resolve atomic-to-molecular (C i -to-CO) transition IM Lup disk with Atacama Large Millimeter/submillimeter Array archival [C ] 3 P 1 – 0 . derive C emitting height z / r ≳ 0.5 emission detected out to radius...
Gravitational instability is thought to be one of the main drivers angular momentum transport in young protoplanetary discs. The disc around Elias 2−27 offers a unique example gravitational at work. It and massive, displaying two prominent spiral arms dust continuum emission global non-axisymmetric kinematic signatures molecular line data. In this work, we used archival ALMA observations 13 CO measure efficiency system through generated by instability, known as “GI wiggles”. Assuming...
[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 study molecular lines observed as part ALMA large program MAPS. Extended localised perturbations velocity, line width, intensity have been analysed jointly using DISCMINER modelling framework, three bright CO lines, 12CO, 13CO, C18O $J=2-1$, provide a comprehensive summary kinematic column density...
The central star and its energetic radiation fields play a vital role in setting the vertical radial chemical structure of planet-forming disks. We present observations that, for first time, clearly reveal UV-irradiated surface protoplanetary disk. Specifically, we spatially resolve atomic-to-molecular (C I-to-CO) transition IM Lup disk with ALMA archival [C I] $^3$P$_1$-$^3$P$_0$. derive C I emitting height z/r $\gtrsim$ 0.5 emission detected out to radius ${\approx}$600 au. Compared other...
ALMA observations of line emission from planet forming discs have demonstrated to be an excellent tool probe the internal disc kinematics, often revealing subtle effects related important dynamical processes occurring in them, such as turbulence, or presence planets, that can inferred pressure bumps perturbing gas motion, detection planetary wake. In particular, we recently shown for case massive Elias 2-27 how one use kind measure deviations Keplerianity induced by self-gravity, thus...
High spatial resolution observations of CO isotopologue line emission in protoplanetary disks at mid-inclinations (${\approx}$30-75°) allow us to characterize the gas structure detail, including radial and vertical substructures, surface heights their dependencies on source characteristics, disk temperature profiles. By combining a suite isotopologues, we can map 2D (r, z) from upper atmosphere, as traced by CO, near midplane, probed less abundant isotopologues. Here, present high angular...