A. Caratti o Garatti
A5030033674- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Molecular Spectroscopy and Structure
- Astrophysical Phenomena and Observations
- Atmospheric Ozone and Climate
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Spectroscopy and Laser Applications
- Astronomical Observations and Instrumentation
- Astrophysics and Cosmic Phenomena
- Atomic and Molecular Physics
- Solar and Space Plasma Dynamics
- High-pressure geophysics and materials
- Galaxies: Formation, Evolution, Phenomena
- Geophysics and Gravity Measurements
- Adaptive optics and wavefront sensing
- Phase Equilibria and Thermodynamics
- Spacecraft and Cryogenic Technologies
- Pulsars and Gravitational Waves Research
- Superconducting Materials and Applications
- Bee Products Chemical Analysis
- Laser-induced spectroscopy and plasma
- Advanced Combustion Engine Technologies
- Advanced Chemical Physics Studies
Astronomical Observatory of Capodimonte
2021-2025
Dublin Institute For Advanced Studies
2016-2025
National Institute for Astrophysics
2002-2024
University of Bologna
2024
University College Dublin
2019-2023
Max Planck Institute for Astronomy
2017-2023
Max Planck Institute for Radio Astronomy
2012-2019
Max Planck Innovation
2019
Max Planck Society
2013-2019
University of Tübingen
2019
We present JWST-MIRI MRS spectra of the protoplanetary disk around low-mass T Tauri star GW Lup from MIRI mid-INfrared Disk Survey (MINDS) GTO program. Emission $^{12}$CO$_{2}$, $^{13}$CO$_{2}$, H$_{2}$O, HCN, C$_{2}$H$_{2}$, and OH is identified with $^{13}$CO$_{2}$ being detected for first time in a disk. characterize chemical physical conditions inner few au using these molecules as probes. The spectral resolution paired high signal-to-noise data essential to identify species determine...
Terrestrial and sub-Neptune planets are expected to form in the inner ($<10~$AU) regions of protoplanetary disks. Water plays a key role their formation, although it is yet unclear whether water molecules formed in-situ or transported from outer disk. So far Spitzer Space Telescope observations have only provided luminosity upper limits for dust-depleted disks, similar PDS 70, first system with direct confirmation protoplanet presence. Here we report JWST benchmark target search disk hosting...
Context . Complex organic molecules (COMs) are ubiquitously detected in the gas phase and thought to be mostly formed on icy grains. Nevertheless, there have not been any unambiguous detections of COMs larger than CH 3 OH ices reported thus far. Exploring this matter greater detail has now become possible with unprecedented possibilities offered by James Webb Space Telescope (JWST) within infrared (IR) spectral range its very high sensitivity resolution critical 5–10 µm range, fingerprint...
Investigating Protostellar Accretion is a Cycle 1 JWST program using the NIRSpec+MIRI integral field units to obtain 2.9--28 $\mu$m spectral cubes of five young protostars with luminosities 0.2-10,000 L$_{\odot}$ in their primary accretion phase. This paper introduces NIRSpec 2.9--5.3 data inner 840-9000 au spatial resolutions from 28-300 au. The spectra show rising continuum emission; deep ice absorption; emission H$_{2}$, H~I, and [Fe~II]; CO fundamental series absorption. Maps scattered...
Abstract Investigating Protostellar Accretion (IPA) is a JWST Cycle 1 GO program that uses NIRSpec integral field units and MIRI Medium Resolution Spectrograph to obtain 2.9–28 μ m spectral cubes of young, deeply embedded protostars with luminosities 0.2–10,000 L ⊙ central masses 0.15–12 M . In this Letter, we report the discovery highly collimated atomic jet from Class 0 protostar IRAS 16253−2429, lowest-luminosity source ( bol = 0.2 ) in IPA program. The detected multiple [Fe ii ] lines...
Abstract The study of protoplanetary disks has become increasingly important with the Kepler satellite finding that exoplanets are ubiquitous around stars in our galaxy and discovery enormous diversity planetary system architectures planet properties. High-resolution near-IR ALMA images show strong evidence for ongoing formation young disks. JWST MIRI mid-INfrared Disk Survey (MINDS) aims to (1) investigate chemical inventory terrestrial planet-forming zone across stellar spectral type, (2)...
MIRI/MRS on board the JWST allows us to probe inner regions of protoplanetary disks. Here we examine disk around classical T Tauri star Sz 98, which has an unusually large dust in millimetre with a compact core. We focus H$_2$O emission through both its ro-vibrational and pure rotational emission. Furthermore, compare our chemical findings those obtained for outer from Atacama Large Millimeter/submillimeter Array (ALMA) observations. In order model molecular features spectrum, continuum was...
Abstract The formation of stars and planets is accompanied not only by the build-up matter, namely accretion, but also its expulsion in form highly supersonic jets that can stretch for several parsecs 1,2 . As accretion jet activity are correlated because young acquire most their mass rapidly early on, powerful associated with youngest protostars 3 This period, however, coincides time when protostar surroundings hidden behind many magnitudes visual extinction. Millimetre interferometers...
Very low-mass stars (those <0.3 solar masses) host orbiting terrestrial planets more frequently than other types of stars, but the compositions those are largely unknown. We use mid-infrared spectroscopy with James Webb Space Telescope to investigate chemical composition planet-forming disk around ISO-ChaI 147, a 0.11 solar-mass star. The inner has carbon-rich chemistry: we identify emission from 13 carbon-bearing molecules including ethane and benzene. derive large column densities...
Abstract SY Cha is a T Tauri star surrounded by protoplanetary disk with large cavity seen in the millimeter continuum but has spectral energy distribution of full disk. Here we report first results from JWST/Mid-InfraRed Instrument (MIRI) Medium Resolution Spectrometer (MRS) observations taken as part MIRI mid-INfrared Disk Survey (MINDS) GTO Program. The much improved resolution and sensitivity MIRI-MRS compared to Spitzer enables robust analysis previously detected H 2 O, CO, HCN, CO...
The structure and composition of simple ices can be modified during stellar evolution by protostellar heating. Key to understanding the involved processes are thermal chemical tracers that diagnose history environment ice. 15.2 $\mu$m bending mode $^{12}$CO$_2$ has proven a valuable tracer ice heating events but suffers from grain shape size effects. A viable alternative is weaker $^{13}$CO$_2$ isotopologue band at 4.39 which now become accessible high S/N with $\textit{James Webb}$ Space...
Context . The MRS mode of the JWST-MIRI instrument has been shown to be a powerful tool characterise molecular gas emission inner region planet-forming disks. Investigating their spectra allows us infer composition in these regions and, subsequently, potential atmospheric forming planets. We present observations compact T-Tauri disk, DR Tau, which are complemented by ground-based, high spectral resolution ( R ~ 60 000–90 000) CO ro-vibrational observations. Aims aim this work is investigate...
Context . Space-based mid-infrared (IR) spectroscopy is a powerful tool for the characterization of important star formation tracers warm gas which are unobservable from ground. The previous mid-IR spectra bright high-mass protostars with Infrared Space Observatory (ISO) in hot-core phase typically show strong absorption features molecules such as CO 2 , C H and HCN. However, little known about their fainter counterparts at earlier stages. Aims We aim to characterize gas-phase molecular...
ABSTRACT During the pre-main-sequence (pre-MS) evolution stage of a star, significant amounts stellar mass are accreted during episodic accretion events, such as multidecade FUor-type outbursts. Here, we present near-infrared spectroscopic follow-up study 33 high-amplitude (most with ΔKs &gt; 4 mag) variable sources discovered by Vista Variables in Via Lactea (VVV) survey. Based on spectral features, 25 classified eruptive young objects (YSOs), including 15 newly identified FUors, six...
Context. Two protoplanets have recently been discovered within the PDS 70 protoplanetary disk. JWST/NIRCam offers a unique opportunity to characterize them and their birth environment at wavelengths difficult access from ground. Aims. We aim image circumstellar of 1.87 $\mu$m 4.83 $\mu$m, assess presence Pa-$\alpha$ emission due accretion onto protoplanets, probe any IR excess indicative heated circumplanetary material. Methods. obtain non-coronagraphic images MINDS (MIRI mid-INfrared Disk...
Context . The Atacama Large Millimeter/submillimeter Array (ALMA) has revealed that the millimetre dust structures of protoplanetary discs are extremely diverse, ranging from small and compact to large with multiple rings gaps. It been proposed strength H 2 O emission in inner disc particularly depends on influx icy pebbles outer disc, a process would correlate radius, could be prevented by pressure bumps. Additionally, structure should also influence other gas species disc. Since...
Abstract The removal of angular momentum from protostellar systems drives accretion onto the central star and may drive dispersal protoplanetary disk. Winds jets can contribute to removing disk, though dominant process remains unclear. To date, observational studies resolved disk winds have mostly targeted highly inclined disks. We report detection extended H 2 [Ne ii ] emission toward young stellar object SY Cha with JWST Mid-InfraRed Instrument Medium-Resolution Spectrometer (MIRI-MRS)....
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...
We present Spitzer Space Telescope IRAC and MIPS observations of a 0.85 deg^2 field including the Corona Australis (CrA) star-forming region. At distance 130 pc, CrA is one closest regions known to be actively forming stars, particularly within its embedded association, Coronet. Using data, we identify 51 young stellar objects (YSOs) in which include sources well-studied Coronet cluster as well distributed throughout molecular cloud. Twelve YSOs discussed are new candidates, located Known...
We present the discovery of 816 high amplitude infrared variable stars ($\Delta K_{\rm s} >$ 1 mag) in 119 deg$^2$ Galactic midplane covered by Vista Variables Via Lactea (VVV) survey. Almost all are new discoveries and about 50$\%$ YSOs. This provides further evidence that YSOs commonest plane. In 2010-2014 time series likely we find variability increases towards younger evolutionary classes (class I flat-spectrum sources) except on short timescales ($<$25 days) where this trend is...
Aims. Recently, substantial flaring in the 6.7 GHz methanol maser line has been observed toward high-mass young stellar object (YSO) S255 NIRS 3, where an accretion burst was also detected IR. Our goal is to study change properties of masers between pre- and outburst phases, investigate connection burst.
In a companion work (Paper I) we detected large population of highly variable Young Stellar Objects (YSOs) in the Vista Variables Via Lactea (VVV) survey, typically with class I or flat spectrum spectral energy distributions and diverse light curve types. Here present infrared spectra (0.9--2.5 $\mu$m) 37 these variables, many them observed bright state. The confirm that 15/18 sources eruptive curves have signatures high accretion rate, either showing EXor-like emission features ($\Delta$v=2...