A5020853714- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Molecular Spectroscopy and Structure
- Atmospheric Ozone and Climate
- Astronomy and Astrophysical Research
- Spectroscopy and Laser Applications
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- Atomic and Molecular Physics
- Adaptive optics and wavefront sensing
- Solar and Space Plasma Dynamics
- Advanced optical system design
- Ionosphere and magnetosphere dynamics
- Advanced Chemical Physics Studies
- Space Exploration and Technology
- Geophysics and Gravity Measurements
- Calibration and Measurement Techniques
- Particle accelerators and beam dynamics
- High-pressure geophysics and materials
- Atmospheric and Environmental Gas Dynamics
- Astrophysics and Cosmic Phenomena
- Spacecraft and Cryogenic Technologies
- Advanced Combustion Engine Technologies
Astronomical Observatory of Rome
2015-2024
National Institute for Astrophysics
2015-2024
Laboratory for Atmospheric and Space Physics
2024
Brera Astronomical Observatory
2020
Max Planck Institute for Radio Astronomy
2015
Max Planck Society
2015
Netherlands Institute for Radio Astronomy
2010-2012
Arcetri Astrophysical Observatory
2010
Institute for Space Astrophysics and Planetology
2010
A.P. Giannini Foundation
2006-2009
Rings are the most frequently revealed substructure in ALMA dust observations of protoplanetary disks, but their origin is still hotly debated. In this paper, we identify substructures 12 disks and measure properties to investigate how they form. This subsample selected from a high-resolution ($\sim0.12''$) 1.33 mm survey 32 Taurus star-forming region, which was designed cover wide range sub-mm brightness be unbiased previously known substructures. While axisymmetric rings gaps common within...
The mass accretion rate, Ṁacc, is a key quantity for the understanding of physical processes governing evolution discs around young low-mass (M⋆ ≲ 2.0 M⊙) stars and substellar objects (YSOs). We present here results study stellar properties (almost) complete sample class II transitional YSOs in Lupus I, II, III IV clouds, based on spectroscopic data acquired with VLT/X-shooter spectrograph. Our combines dataset from our previous work new observations 55 additional objects. have investigated...
`Water In Star-forming regions with Herschel' (WISH) is a key program on the Herschel Space Observatory designed to probe physical and chemical structure of young stellar objects using water related molecules follow abundance from collapsing clouds planet-forming disks. About 80 sources are targeted covering wide range luminosities evolutionary stages, cold pre-stellar cores warm protostellar envelopes outflows disks around stars. Both HIFI PACS instruments used observe variety lines H2O,...
Context. Water is a key tracer of dynamics and chemistry in low-mass star-forming regions, but spectrally resolved observations have so far been limited sensitivity angular resolution, only data from the brightest protostars published.
Abstract We present a high-resolution (∼0.″12, ∼16 au, mean sensitivity of 50 μ Jy beam −1 at 225 GHz) snapshot survey 32 protoplanetary disks around young stars with spectral type earlier than M3 in the Taurus star-forming region using Atacama Large Millimeter Array. This sample includes most mid-infrared excess members that were not previously imaged high spatial resolution, excluding close binaries and objects extinction, thereby providing more representative look disk properties 1–2 Myr....
Water is a crucial molecule in molecular astrophysics as it controls much of the gas/grain chemistry, including formation and evolution more complex organic molecules ices. Pre-stellar cores provide original reservoir material from which future planetary systems are built, but few observational constraints exist on water its partitioning between gas ice densest cores. Thanks to high sensitivity Herschel Space Observatory, we report first detection vapor at spectral resolution toward dense...
ALMA has observed a plethora of ring-like structures in planet forming discs at distances 10-100 au from their host star. Although several mechanisms have been invoked to explain the origin such rings, common explanation is that they trace new-born planets. Under planetary hypothesis, natural question how reconcile apparently high frequency gap-carving planets with paucity Jupiter mass around main sequence stars those separations. Here, we provide an analysis population emerging observations...
We have analysed the [OI]6300 A line in a sample of 131 young stars with discs Lupus, Chamaeleon and signa Orionis star forming regions, observed X-shooter spectrograph at VLT. The mass accretion rates spanning from 10^{-12} to 10^{-7} Mo/yr. profile was deconvolved into low velocity component (LVC, < 40 km/s) high (HVC, > km/s ), originating slow winds jets, respectively. LVC is by far most frequent component, detection rate 77%, while only 30% sources HVC. luminosity both HVC, when...
We present an in-depth near-IR analysis of a sample H2 outflows from young embedded sources to compare the physical properties and cooling mechanisms different flows. The comprises 23 driven by Class 0 I having low-intermediate luminosity. have obtained narrow band images in 2.12 μm [] 1.64 spectroscopic observations range 1-2.5 μm. From we detected spots ionized gas ~74% which some cases indicate presence HH-like objects. line ratios been used estimate visual extinction average temperature...
High resolution line spectra of star-forming regions are mines information: they provide unique clues to reconstruct the chemical, dynamical, and physical structure observed source. We present first results from <i>Herschel<i/> key project "Chemical <i>HErschel<i/> Surveys Star forming regions", CHESS. report discuss observations towards five CHESS targets, one outflow shock spot four protostars with luminosities bewteen 20 2 × 10<sup>5<sup/> : L1157-B1, IRAS 16293-2422, OMC2-FIR4, AFGL...
We present the first results of unbiased survey L1157-B1 bow shock, obtained with HIFI in framework key program Chemical <i>HErschel<i/> Survey Star forming regions (CHESS). The L1157 outflow is driven by a low-mass Class 0 protostar and considered prototype so-called chemically active outflows. bright blue-shifted shock B1 ideal laboratory for studying link between hot (~1000–2000 K) component traced H<sub>2<sub/> IR-emission cold (~10–20 swept-up material. main aim to trace warm gas...
In the framework of Water in Star-forming regions with Herschel (WISH) key program, maps water lines several outflows from young stars are being obtained, to study production shocks and its role outflow cooling. This paper reports first results this presenting a PACS map o-H2O 179 um transition obtained toward L1157. The is compared those other important shock tracers, previous single-pointing ISO, SWAS, Odin observations same source that allow us constrain abundance total Strong H2O peaks...
Context: Hydrides of the most abundant heavier elements are fundamental molecules in cosmic chemistry. Some them trace gas irradiated by UV or X-rays. Aims: We explore abundances major hydrides W3 IRS5, a prototypical region high-mass star formation. Methods: IRS5 was observed HIFI on Herschel Space Observatory with deep integration (about 2500 s) 8 spectral regions. Results: The target lines including CH, NH, H3O+, and new SH+, H2O+, OH+ detected. H2O+ J=1-0 found mostly absorption, but...
We report the first detection of chloronium, H$_2$Cl$^+$, in interstellar medium, using HIFI instrument aboard \emph{Herschel} Space Observatory. The $2_{12}-1_{01}$ lines ortho-H$_2^{35}$Cl$^+$ and ortho-H$_2^{37}$Cl$^+$ are detected absorption towards NGC~6334I, $1_{11}-0_{00}$ transition para-H$_2^{35}$Cl$^+$ is NGC~6334I Sgr~B2(S). H$_2$Cl$^+$ column densities compared to those chemically-related species HCl. derived HCl/H$_2$Cl$^+$ density ratios, $\sim$1--10, within range predicted by...
'Water in Star-forming regions with Herschel' (WISH) is a Herschel Key Programme aimed at understanding the physical and chemical structure of young stellar objects (YSOs) focus on water related species. The low-mass protostar HH 46 was observed Photodetector Array Camera Spectrometer (PACS) Space Observatory to measure emission H2O, CO, OH, [OI], [CII] lines located between 63 186 um. excitation spatial distribution can disentangle different heating mechanisms YSOs, better resolution...
Water is key in the evolution of protoplanetary disks and formation comets icy/water planets. While high excitation water lines originating hot inner disk have been detected several T Tauri stars (TTSs), vapor from outer disk, where most ice reservoir stored, was only reported closeby TTS TW Hya. We present spectrally resolved Herschel/HIFI observations young DG Tau ortho- para- ground-state transitions at 557, 1113 GHz. The show a narrow double-peaked profile, consistent with an origin are...
'Water In Star-forming regions with Herschel' (WISH) is a key programme dedicated to studying the role of water and related species during star-formation process constraining physical chemical properties young stellar objects. The Heterodyne Instrument for Far-Infrared (HIFI) on Herschel Space Observatory observed three deeply embedded protostars in low-mass star-forming region NGC1333 several H2-16O, H2-18O, CO transitions. Line profiles are resolved five H16O transitions each source,...
Context: Because it is viewed simply edge-on, the HH212 protostellar system an ideal laboratory for studying interplay of infall, outflow, and rotation in earliest stages low-mass star formation. Aims: We wish to exploit unmatched combination high angular resolution, sensitivity, high-imaging fidelity, spectral coverage provided by ALMA shed light on complex kinematics innermost central regions HH212. Methods: mapped inner 10" (4500 AU) at about 0.5 arcsec resolution several molecular...
To investigate the disk formation and jet launch in protostars is crucial to comprehend earliest stages of star planet formation. We aim constrain properties molecular HH 212 protostellar system at unprecedented angular scales through ALMA observations sulfur-bearing molecules, SO 9(8)-8(7), 10(11)-10(10), SO2 8(2,6)-7(1,7). 9(8)-8(7) 8(2,6)-7(1,7) show broad velocity profiles. At systemic they probe circumstellar gas cavity walls. Going from low high blue-/red-shifted velocities emission...
Determining the mechanisms that drive evolution of protoplanetary disks is a necessary step to understand how planets form. Here we measured mass accretion rate for young stellar objects at age >5 Myr, critical test current models disk evolution. We present analysis spectra 36 targets in ~5-10 Myr old Upper Scorpius region which masses were with ALMA. find rates this sample but still survived are similarly high as those younger (<3 old) star-forming regions Lupus and Cha I, when considering...