A5059627498- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Molecular Spectroscopy and Structure
- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Spectroscopy and Laser Applications
- Atmospheric Ozone and Climate
- Gamma-ray bursts and supernovae
- Spacecraft and Cryogenic Technologies
- Phase Equilibria and Thermodynamics
- Tribology and Lubrication Engineering
- Galaxies: Formation, Evolution, Phenomena
- Adaptive optics and wavefront sensing
- Educational Outcomes and Influences
- High-pressure geophysics and materials
- Space Science and Extraterrestrial Life
- Space Exploration and Technology
- Mechanics and Biomechanics Studies
- Advanced Thermodynamic Systems and Engines
- Advanced Combustion Engine Technologies
- Soil Moisture and Remote Sensing
- Tactile and Sensory Interactions
- Geological and Geochemical Analysis
University of California, Los Angeles
2025
Mayo Clinic
2025
WinnMed
2025
Universidad de Santiago de Chile
2019-2024
University of Chile
2012-2024
Millenium Nucleus for Planet Formation
2023
Diego Portales University
2012-2023
Universidad Bernardo O'Higgins
2015-2021
Max Planck Institute for Astronomy
2018-2019
Max Planck Society
2018-2019
Abstract We present the first part of our Disks ARound T Tauri Stars with SPHERE (DARTTS-S) survey: observations eight stars that were selected based on their strong (sub)millimeter excesses using SPHERE/IRDIS polarimetric differential imaging in J and H bands. All successfully detect disks, which appear vastly different size, from ≈80 au scattered light to >400 au, display total polarized disk fluxes between 0.06% 0.89% stellar flux. For five these we are able determine three-dimensional...
Detailed observations of gaps in protoplanetary disks have revealed structures that drive current research on circumstellar disks. One such feature is the two intensity nulls seen along outer disk HD 142527 system, which are particularly well traced polarized differential imaging. Here we propose these shadows cast by inner disk. The and thick, terms unit-opacity surface H band, so shape orientation inform three-dimensional structure system. Radiative transfer predictions a parametric model...
We introduce the Ophiuchus DIsc Survey Employing ALMA (ODISEA), a project aiming to study entire population of Spitzer-selected protoplanetary discs in Molecular Cloud (~300 objects) from both millimeter continuum and CO isotopologues data. Here we present 1.3 mm/230 GHz images 147 targets at 0.2" (28 au) resolution typical rms 0.15 mJy. detect total 133 discs, including individual components 11 binary systems 1 triple system. Fifty-three these are spatially resolved. find clear...
Abstract The size of a protoplanetary disk is fundamental property, yet most remain unresolved, even in nearby star-forming regions ( d ∼ 140–200 pc). We present the complete continuum distribution for 105 brightest disks M dust ≳ 2 ⊕ ) Ophiuchus cloud, obtained from ALMA Band 8 (410 GHz) observations at 0 <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mover> <mml:mrow> <mml:mo>.</mml:mo> </mml:mrow> <mml:mtext>″</mml:mtext> </mml:mover> </mml:math> 05 (7...
We present 3D hydrodynamical models of the HD 142527 protoplanetary disc, a bright and well-studied disc that shows spirals shadows in scattered light around 100 au gas cavity, large horseshoe dust structure mm continuum emission, together with mysterious fast radial flows streamers seen kinematics. By considering several possible orbits consistent observed arc, we show all main observational features can be explained by one mechanism – interaction between binary companion. find spirals,...
The finding of residual gas in the large central cavity HD142527 disk motivates questions on origin its non-Keplerian kinematics, and possible connections with planet formation. We aim to understand physical structure that underlies intra-cavity gaseous flows, guided by new molecular-line data CO(6-5) unprecedented angular resolutions. Given warped inferred from identification scattered-light shadows cast outer disk, kinematics are consistent, first order, axisymmetric accretion onto inner...
A pathway to the formation of planetesimals, and eventually giant planets, may occur in concentrations dust grains trapped pressure maxima. Dramatic crescent-shaped have been seen recent radio images at sub-mm wavelengths. These disk asymmetries could represent initial phases planet trap scenario, provided that grain sizes are spatially segregated. testable prediction azimuthal trapping is progressively larger should be more sharply confined furthermore follow a distribution markedly...
An increasing number of observations have shown that gaseous debris discs are not an exception. However, until now, we only knew cases around A stars. Here present the first detection 12CO (2–1) disc emission F star, HD 181327, obtained with Atacama Large Millimeter/submillimeter Array (ALMA) at 1.3 mm. The continuum and CO resolved into axisymmetric ring-like morphology. Using a Markov chain Monte Carlo method coupled radiative transfer calculations, study dust mass distribution. We find is...
The identification of ongoing planet formation requires the finest angular resolutions and deepest sensitivities in observations inspired by state-of-the-art numerical simulations. Hydrodynamic simulations planet–disk interactions predict circumplanetary disks (CPDs) around accreting planetary cores. These CPDs have eluded unequivocal detection—their predictions CPD tracers. In this work, we aim to assess observability embedded with Atacama Large Millimeter/submillimeter Array (ALMA) as...
Context. Gaps, cavities, and rings in circumstellar disks are signposts of disk evolution planet-disk interactions. We follow the recent suggestion that Herbig Ae/Be with a flared harbor cavity, investigate around HD 97048.
Abstract As protostars evolve from optically faint/infrared-bright (Class I) sources to bright/infrared-faint II) the solid material in their surrounding disks accumulates into planetesimals and protoplanets. The nearby, young Ophiuchus star-forming region contains hundreds of a range evolutionary states. Using Atacama Large Millimeter Array observe millimeter continuum emission, we have measured masses of, or placed strong upper limits on, dust content 279 disks. follow log-normal...
We present 1.3 mm continuum ALMA long-baseline observations at 3-5 au resolution of 10 the brightest discs from Ophiuchus DIsc Survey Employing (ODISEA) project. identify a total 26 narrow rings and gaps distributed in 8 sources 3 with small dust cavities (r $<$10 au). find that two around embedded protostars lack clear are ubiquitous more evolved Class II SEDs. Our sample includes 5 objects previously known large $>$20 radial profiles these good agreement those produced by numerical...
Abstract High spatial resolution CO observations of midinclination (≈30°–75°) protoplanetary disks offer an opportunity to study the vertical distribution emission and temperature. The asymmetry line relative disk major axis allows for a direct mapping height above midplane, optically thick, spatially resolved in LTE, intensity is measure local gas Our analysis Atacama Large Millimeter/submillimeter Array archival data yields surfaces, dynamically constrained stellar host masses, atmosphere...
The sample of planet-forming disks observed by high-contrast imaging campaigns over the last decade is mature enough to enable demographical analysis individual star-forming regions. We present full census Taurus sources with VLT/SPHERE polarimetric images available. whole sums up 43 targets (of which 31 have not been previously published) corresponding one-fifth Class II population in and about half such objects that are observable. A large fraction apparently made isolated faint (equally...
In view of both the size its gap and previously reported asymmetries near-infrared spiral arms, transition disk Herbig Fe star HD 142527 constitutes a remarkable case study. This paper focuses on morphology outer through ALMA observations 12CO J = 2–1, 3–2, 13CO 2–1. Both 2–1 3–2 show features different sizes. The innermost arm (S1) is radio counterpart first observed by Fukagawa, but it shifted radially outward. However, most conspicuous CO (S2) lies at outskirts has not been detected...
Inner cavities and annular gaps in circumstellar disks are possible signposts of giant planet formation. The young star HD 142527 hosts a massive protoplanetary disk with large cavity that extends up to 140 au from the central star, as seen continuum images at infrared millimeter wavelengths. Estimates survival gas inside needed discriminate between clearing scenarios. We present spatially spectrally resolved carbon monoxide isotopologue observations gas-rich 142527, J=2-1 line 12CO, 13CO...
Optical/IR images of transition discs (TDs) have revealed deep intensity decrements in the rings HAeBes HD 142527 and 100453 that can be interpreted as shadowing from sharply tilted inner discs, such outer are directly exposed to stellar light. Here we report similar dips SPHERE+IRDIS differential polarized imaging (DPI) T Tauri DoAr 44. With a fairly axially symmetric ring sub-mm radio continuum, 44 is likely also warped system. We constrain warp geometry by comparing radiative transfer...
Empirical evidence of planets in gas-rich circumstellar discs is required to constrain giant planet formation theories. Here we study the kinematic patterns which arise from planet-disc interactions and their observability CO rotational emission lines. We perform three-dimensional hydrodynamical simulations single planets, predict emergent intensity field with radiative transfer. Pressure gradients at planet-carved gaps, spiral wakes vortices bear strong counterparts. The iso-velocity...
Context. Near-IR polarimetric images of protoplanetary disks enable us to characterize substructures that might be due the interaction with (forming) planets. The available census is strongly biased toward massive around old stars, however. Aims. DARTTS program aims at alleviating this bias by imaging a large number T Tauri stars diverse properties. Methods. DARTTS-S employs VLT/SPHERE image polarized scattered light from disks. In parallel, DARTTS-A provides ALMA same targets for comparison...
Resolved ALMA and VLA observations indicate the existence of two dust traps in protoplanetary disc MWC 758. By means 2D gas+dust hydrodynamical simulations post-processed with 3D radiative transfer calculations, we show that spirals scattered light, eccentric, asymmetric ring crescent-shaped structure (sub)millimetre can all be caused by giant planets: a 1.5-Jupiter mass planet at 35 au (inside spirals) 5-Jupiter 140 (outside spirals). The outer forms dust-trapping vortex inner edge its gap...
The vestiges of planet formation have been observed in debris disks harboring young and massive gaseous giants. process giant is terminated by the dissipation gas protoplanetary disk. gas-rich disk around HD142527 features a small inner disk, large gap from \sim10 to \sim140AU, outer extending out \sim300AU. could carved-out planet. We imaged regions this using adaptive-optics camera NICI on Gemini South. Our images reveal that dynamically perturbed. boundary roughly elliptical appears be...
Low-mass stars build a significant fraction of their total mass during short outbursts enhanced accretion known as FUor and EXor outbursts. objects are characterized by sudden brightening ~5 magnitudes at visible wavelengths within one year remain bright for decades. have lower amplitude on shorter timescales. Here we discuss 1.3 mm ALMA mini-survey eight outbursting sources (three FUor, four EXor, the borderline object V1647 Ori) in Orion Molecular Cloud. While previous papers this series...