I. de Gregorio‐Monsalvo
A5023695554- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Molecular Spectroscopy and Structure
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astrophysics and Cosmic Phenomena
- Atmospheric Ozone and Climate
- Astronomical Observations and Instrumentation
- Galaxies: Formation, Evolution, Phenomena
- Pulsars and Gravitational Waves Research
- Phase Equilibria and Thermodynamics
- Solar and Space Plasma Dynamics
- Advanced Combustion Engine Technologies
- SAS software applications and methods
- Systemic Lupus Erythematosus Research
- Atomic and Molecular Physics
- Radio Astronomy Observations and Technology
- Spectroscopy and Laser Applications
- Geophysics and Gravity Measurements
- Calibration and Measurement Techniques
- Adaptive optics and wavefront sensing
- Superconducting and THz Device Technology
- Planetary Science and Exploration
European Southern Observatory
2014-2024
European Southern Observatory
2010-2021
University of Valparaíso
2019-2021
Atacama Large Millimeter Submillimeter Array
2012-2021
Millenium Nucleus for Planet Formation
2019-2021
Instituto de Física Fundamental
2004-2006
National Radio Astronomy Observatory
2004-2005
Instituto Nacional de Técnica Aeroespacial
2004
Instituto de Tecnologías Físicas y de la Información “Leonardo Torres Quevedo”
2003
We present Atacama Large Millimeter/submillimeter Array (ALMA) observations from the 2014 Long Baseline Campaign in dust continuum and spectral line emission HL Tau region. The images at wavelengths of 2.9, 1.3, 0.87 mm have unprecedented angular resolutions 0 075 (10 AU) to 025 (3.5 AU), revealing an astonishing level detail circumstellar disk surrounding young solar analog Tau, with a pattern bright dark rings observed all wavelengths. By fitting ellipses most distinct rings, we measure...
ABSTRACT The recent ALMA observations of the disk surrounding HL Tau reveal a very complex dust spatial distribution. We present radiative transfer model accounting for observed gaps and bright rings as well radial changes emissivity index. find that density is depleted by at least factor 10 in main compared to rings. Ring masses range from 10–100 M ⊕ dust, we each deepest consistent with removal up 40 dust. If this material has accumulated into rocky bodies, these would be close point...
We present Atacama Large Millimeter and Submillimeter Array observations of the protoplanetary disk around Herbig Ae star HD 163296 that trace spatial distribution millimeter-sized particles cold molecular gas on scales as small 25 astronomical units (A.U.). The image recorded in 1.3 mm continuum emission reveals three dark concentric rings indicate presence dust depleted gaps at about 60, 100, 160 A.U. from central star. maps CO12, CO13, CO18 J=2−1 do not show such structures but reveal a...
Discs of gas and dust surrounding young stars are the birthplace planets. However, direct detection protoplanets forming within discs has proved elusive to date. We present a large, localized deviation from Keplerian velocity in protoplanetary disc star HD163296. The observed pattern is consistent with dynamical effect two Jupiter-mass planet orbiting at radius $\approx$ 260au star.
One-Sided Story from Disk In young analogs of the solar system, ongoing erosion comets and nascent planets produces dusty debris that is eventually expelled by host star. Gas should also be released in this process when volatile ices sublimate, but it detected less often. Using Atacama Large Millimeter/Submillimeter Array, Dent et al. (p. 1490 , published online 6 March; see Perspective Brandeker ) mapped a highly asymmetric disk dust carbon monoxide orbiting planet-hosting star, β Pictoris....
We present an overview of the Large Program, ``Early Planet Formation in Embedded Disks (eDisk)'', conducted with Atacama Millimeter/submillimeter Array (ALMA). The ubiquitous detections substructures, particularly rings and gaps, protoplanetary disks around T Tauri stars raise possibility that at least some planet formation may have already started during embedded stages star formation. In order to address exactly how when is initiated, program focuses on searching for substructures 12...
Aims: The aim of this work is to study the structure protoplanetary disk surrounding Herbig Ae star HD 163296. Methods: We have used high-resolution and high-sensitivity ALMA observations CO(3-2) emission line continuum at 850 microns, as well 3- dimensional radiative transfer code MCFOST model data presented in work. Results: unveils for first time sub-millimeter frequencies vertical details a gaseous Keplerian rotation, showing back- front-side flared disk. Continuum microns reveals...
Accurate measurements of the physical structure protoplanetary discs are critical inputs for planet formation models. These constraints traditionally established via complex modelling continuum and line observations. Instead, we present an empirical framework to locate CO isotopologue emitting surfaces from high spectral spatial resolution ALMA We apply this disc surrounding IM Lupi, where report first direct, i.e. model independent, radial vertical gradients temperature velocity in a disc....
A major goal of the Atacama Large Millimeter/submillimeter Array (ALMA) is to make accurate images with resolutions tens milliarcseconds, which at submillimeter (submm) wavelengths requires baselines up ~15 km. To develop and test this capability, a Long Baseline Campaign (LBC) was carried out from September late November 2014, culminating in end-to-end observations, calibrations, imaging selected Science Verification (SV) targets. This paper presents an overview campaign its main results,...
The high spatial and line sensitivity of ALMA opens the possibility resolving emission from molecules in circumstellar disks. With an understanding physical conditions under which have abundance, they can be used as direct tracers distinct regions. In particular, DCO+ is expected to enhanced abundance within a few Kelvin CO freezeout temperature 19 K, making it useful probe cold disk midplane. We compare observations HD 163296 grid models. vary upper- lower-limit temperatures region present...
Recent ALMA observations unveiled the structure of CO gas in 23 Myr-old $β$ Pictoris planetary system, a component that has been discovered many similarly young debris disks. We here present J=2-1 observations, at an improved spectro-spatial resolution and sensitivity compared to previous J=3-2 observations. find 1) clump is radially broad, favouring resonant migration over giant impact scenario for its dynamical origin, 2) disk vertically tilted main dust disk, angle consistent with...
We present initial results of very high resolution Atacama Large Millimeter/submillimeter Array (ALMA) observations the z = 3.042 gravitationally lensed submillimeter galaxy HATLAS J090311.6+003906 (SDP.81). These were carried out using a extended configuration as part Science Verification for 2014 ALMA Long Baseline Campaign, with baselines up to ∼15 km. continuum imaging at 151, 236, and 290 GHz unprecedented angular resolutions fine 23 mas, corresponding an unmagnified spatial scale ∼180...
We present ALMA continuum and spectral line data at 0.89 mm 3.2 for three disks surrounding young brown dwarfs very low mass stars in the Taurus star forming region. Dust thermal emission is detected spatially resolved all disks, while CO(J=3-2) seen two disks. analyze visibilities constrain physical structure dust. The results of our analysis show that are relatively large, smallest one with an outer radius about 70 AU. inferred disk radii, radial profiles dust surface density to central...
Abstract While dust disks around optically visible, Class II protostars are found to be vertically thin, when and how settles the midplane unclear. As part of Atacama Large Millimeter/submillimeter Array large program, Early Planet Formation in Embedded Disks, we analyze edge-on, embedded, I protostar IRAS 04302+2247, also nicknamed “Butterfly Star.” With a resolution 0.″05 (8 au), 1.3 mm continuum shows an asymmetry along minor axis that is evidence thick geometrically disk viewed nearly...
Abstract We present observations of the Class 0 protostar IRAS 16544–1604 in CB 68 from “Early Planet Formation Embedded Disks (eDisk)” ALMA Large program. The target continuum and lines at 1.3 mm with an angular resolution ∼5 au. image reveals a dusty protostellar disk radius ∼30 au seen close to edge-on asymmetric structures along both major minor axes. While asymmetry axis can be interpreted as effect dust flaring, comes real nonaxisymmetric structure. C 18 O cubes clearly show gas that...
We present the results of combined NH3 (1,1) and (2,2) line emission observed with Very Large Array Effelsberg 100 m telescope infrared dark cloud G14.225−0.506. The reveals a network filaments constituting two hub–filament systems. Hubs are associated gas rotational temperature Trot ∼ 15 K, non-thermal velocity dispersion σNT 1 km s−1, exhibit signs star formation, while appear to be more quiescent (Trot 11 K 0.6 s−1). Filaments parallel in projection distributed mainly along directions, at...
The study of the properties disks around young brown dwarfs can provide important clues on formation these very low-mass objects and possibility forming planetary systems them. presence warm dusty is well known, based near- mid-infrared studies. High angular resolution observations cold outer disk are limited; we used ALMA to attempt a first survey in $ρ$-Oph star-forming region. All 17 our sample were observed at 890 $μ$m continuum $\sim0.\!^{\prime\prime}5$ resolution. sensitivity was...
We present ALMA images of the sub-mm continuum polarisation and spectral index protoplanetary ringed disk HD163296. The fraction at 870{\mu}m is measured to be ~0.9% in central core generally increases with radius along major axis. It peaks gaps between dust rings, largest value (~4%) found rings 1 2. vectors are aligned minor axis core, but become more azimuthal gaps, twisting by up +/-9degrees gap These general characteristics consistent a model self-scattered radiation structure, without...
Here we present deep (16 mumJy), very high (40 mas) angular resolution 1.14 mm, polarimetric, Atacama Large Millimeter/submillimeter Array (ALMA) observations towards the massive protostar driving HH 80-81 radio jet. The clearly resolve disk oriented perpendicular to jet, with a radius of ~0.171 arcsec (~291 au at 1.7 kpc distance). continuum brightness temperature, intensity profile, and polarization properties indicate that is optically thick for R<170 au. linear dust emission detected...
We perform a comprehensive demographic study of the CO extent relative to dust disk population in Lupus clouds, order find indications evolution and possible correlations with other properties. increase up 42 number disks region measured sizes ($R_{\mathrm{CO}}$, $R_{\mathrm{dust}}$) from observations Atacama Large Millimeter/submillimeter Array (ALMA). The are obtained modeling ${^{12}}$CO $J = 2-1$ line emission continuum at $\sim 0.89$ mm an empirical function (Nuker profile or Gaussian...
(Abridged) We present a study of the disk population in L1688, densest and youngest region Ophiuchus, we compare it with other nearby regions different age, namely Lupus, Chamaeleon I, Corona Australis, Taurus Upper Scorpius. select our L1688 sample using combination criteria (ALMA data, Gaia, optical/near-IR spectroscopy) determine stellar properties, specifically mass (Mstar), average accretion rate (Macc) dust (Mdust). a) In relations between Macc Mstar, Mdust have roughly linear trend...