A5026418145- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
- Gamma-ray bursts and supernovae
- Molecular Spectroscopy and Structure
- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Spacecraft Design and Technology
- Solar and Space Plasma Dynamics
- Galaxies: Formation, Evolution, Phenomena
- Intracranial Aneurysms: Treatment and Complications
- Atmospheric Ozone and Climate
- Traumatic Brain Injury and Neurovascular Disturbances
- Astrophysics and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Neurosurgical Procedures and Complications
- Geophysics and Gravity Measurements
- Vascular Malformations Diagnosis and Treatment
- Space Science and Extraterrestrial Life
- Spacecraft and Cryogenic Technologies
- Systems Engineering Methodologies and Applications
- Ionosphere and magnetosphere dynamics
- Spacecraft Dynamics and Control
- Chemical Thermodynamics and Molecular Structure
- Statistical and numerical algorithms
Arcetri Astrophysical Observatory
2007-2024
University College Dublin
2014-2024
Sapienza University of Rome
2024
Beaumont Hospital
2020-2023
Dublin Institute For Advanced Studies
2005-2022
Max Planck Institute for Astronomy
2020
Max Planck Institute for Extraterrestrial Physics
2017-2020
Aintree University Hospital
2020
University of Liverpool
2020
SRON Netherlands Institute for Space Research
2018
Thousands of exoplanets have now been discovered with a huge range masses, sizes and orbits: from rocky Earth-like planets to large gas giants grazing the surface their host star. However, essential nature these remains largely mysterious: there is no known, discernible pattern linking presence, size, or orbital parameters planet its parent We little idea whether chemistry linked formation environment, type star drives physics planet's birth, evolution. ARIEL was conceived observe number...
We report findings from the first set of data in a current survey to establish conclusively whether jets young stars rotate. observed bi-polar T Tauri TH28 and RW Aur, blue-shifted jet star LkH$α$321, using Hubble Space Telescope Imaging Spectrograph (HST/STIS). Forbidden emission lines (FELs) show distinct systematic velocity asymmetries 10 -- 25 (+/- 5) km/s at distance 0".3 source, representing (projected) ~ 40 AU along case 50 for TH28, 165 LkH$α$321. These are interpreted as rotation...
We present survey results that suggest rotation signatures at the base of T Tauri jets. Observations were conducted with Hubble Space Telescope Imaging Spectrograph optical and near-ultraviolet (NUV) wavelengths. Results are presented for approaching jet from DG Tau, CW HH 30, bipolar TH 28. Systematic asymmetries in Doppler shift detected across jet, within 100 AU star. At wavelengths, radial velocity differences typically ± 5 km s -1, while NUV range consistently lower, 10 s-1. interpreted...
The evolution of young stars and disks is driven by the interplay several processes, notably accretion ejection material. Critical to correctly describe conditions planet formation, these processes are best probed spectroscopically. About five-hundred orbits Hubble Space Telescope (HST) being devoted in 2020-2022 ULLYSES public survey about 70 low-mass (M<2Msun) (age<10 Myr) at UV wavelengths. Here we present PENELLOPE Large Program that carried out ESO Very (VLT) acquire,...
Abstract We present the first results of JWST program PROJECT-J (PROtostellar JEts Cradle Tested with JWST), designed to study Class I source HH46 IRS and its outflow through NIRSpec MIRI spectroscopy (1.66–28 μ m). The data provide line images (∼6.″6 in length NIRSpec, up ∼20″ MIRI) revealing unprecedented details within jet, molecular outflow, cavity. detect, for time, redshifted jet ∼90 au from source. Dozens shock-excited forbidden lines are observed, including highly ionized species...
Using STIS on board the HST we have obtained a spectroscopic map of bipolar jet from RW Aur with slit parallel to axis and moved across in steps . After applying velocity correction due uneven illumination find signatures rotation within first 300 AU (15 at distance Aur). Both lobes rotate same direction (i.e. different helicities), toroidal velocities range 5–30 km s-1 20 30 symmetry blueshifted redshifted lobes, respectively. The sense is anti-clockwise looking tip blue lobe (PA 130° north...
We present an analysis of the gas physics at base jets from five T Tauri stars based on high angular resolution optical spectra, using Hubble Space Telescope Imaging Spectrograph (HST STIS). The spectra refer to a region within 100 AU star, i.e., where collimation jet has just taken place. form position-velocity (PV) images line ratios get global picture flow excitation. then apply specialized diagnostic technique find electron density, ionization fraction, temperature, and total density....
Abstract We present polarimetric data of CW Tau and DG Tau, two well-known Class II disk/jet systems, obtained with the Atacama Large Millimeter/submillimeter Array (ALMA) at 870 μ m 0.″2 average resolution. In total polarized emission are both smooth symmetric, polarization angles almost parallel to minor axis projected disk. contrast, displays a structured emission, an elongated brighter region in disk’s near side belt-like feature beyond about 0.″3 from source. At same time, intensity is...
SPIDERS (SPectroscopic IDentification of eROSITA Sources) is a Sloan Digital Sky Survey IV (SDSS-IV) survey running in parallel to the Extended Baryon Oscillation Spectroscopic (eBOSS) cosmology project. will obtain optical spectroscopy for large numbers X-ray-selected active galactic nuclei (AGN) and galaxy cluster members detected wide-area eROSITA, XMM–Newton ROSAT surveys. We describe methods used choose spectroscopic targets two sub-programmes X-ray selected AGN candidates All Slew have...
Abstract The Hubble UV Legacy Library of Young Stars as Essential Standards (ULLYSES) Director’s Discretionary Program low-mass pre-main-sequence stars, coupled with forthcoming data from Atacama Large Millimeter/submillimeter Array and James Webb Space Telescope, will provide the foundation to revolutionize our understanding relationship between young stars their protoplanetary disks. A comprehensive evaluation physics disk evolution planet formation requires intricate relationships mass...
Planets form in protoplanetary disks and inherit their chemical compositions. It is thus crucial to map the distribution investigate formation of simple organics, such as formaldehyde methanol, disks. We analyze ALMA observations nearby disk-jet system around T Tauri star DG Tau o-H$_2$CO $3_{1,2}-2_{1,1}$ CH$_3$OH $3_{-2,2}-4_{-1,4}$ E, $5_{0,5}-4_{0,4}$ A transitions at an unprecedented resolution $\sim0.15"$, i.e., $\sim18$ au a distance 121 pc. The H$_2$CO emission originates from...
Context. Stellar jets are believed to play a key role in star formation, but the question of how they originate is still being debated.
Ariel, the Atmospheric Remote-sensing Infrared Exoplanet Large-survey, was adopted as fourth medium-class mission in ESA's Cosmic Vision programme to be launched 2029. During its 4-year mission, Ariel will study what exoplanets are made of, how they formed and evolve, by surveying a diverse sample of about 1000 extrasolar planets, simultaneously visible infrared wavelengths. It is first dedicated measuring chemical composition thermal structures hundreds transiting exoplanets, enabling...
Context. RW Aur A is a classical T Tauri star that has suddenly undergone three major dimming events since 2010. The reason for these still not clear. Aims. We aim to understand the properties, examine accretion variability, and derive physical properties of inner disc traced by CO ro-vibrational emission at near-infrared wavelengths (2.3 μ m). Methods. compared two epochs X-shooter observations, during after dimming. modelled rarely detected bandhead in both whether had changed. spectral...
This work presents the catalogue of optical spectral properties for all X-ray selected SPIDERS active galactic nuclei (AGN) up to SDSS DR14. (SPectroscopic IDentification eROSITA Sources) is an SDSS-IV programme that currently conducting spectroscopy counterparts sources detected in ROSAT all-sky survey and XMM-Newton slew footprint Extended Baryon Oscillation Spectroscopic Survey (eBOSS). The DR14 sample largest AGN with spectroscopic follow-up date. presented here based on a clean 7344...
We present results of the second phase our near-ultraviolet investigation into protostellar jet rotation using Hubble Space Telescope Imaging Spectrograph. obtain long-slit spectra at base five T Tauri jets to determine if there is a difference in radial velocity between borders which may be interpreted as signature. These observations are extremely challenging and push limits current instrumentation, but have potential provide long-awaited observational support for magnetocentrifugal...
We present a radial velocity study of the RY Tau jet-disk system, designed to determine whether transfer angular momentum from disk jet can be observed. Many recent studies report on rotation T Tauri disks, and what may signature rotation. However, due observational difficulties, few both within same system establish if senses match hence interpreted as momentum. clear Keplerian in disk, based Plateau de Bure observations. also transverse profile close star. identify two distinct shapes:...
Recently, differences in Doppler shifts across the base of four close classical T Tauri star jets have been detected with HST optical and near-ultraviolet (NUV) emission lines, these were interpreted as rotation signatures under assumption steady state flow. To support this interpretation, it is necessary that underlying disks rotate same sense. Agreement between disk jet determined from lines has verified two cases rejected one case. Meanwhile, NUV which may trace faster more collimated...
Context. The He I λ 0830 Å line is a high excitation which allows us to probe the material in innermost regions of protostellar disks, and trace both accreting outflowing simultaneously. Aims. We use X-shooter observations sample 107 young stars Lupus (1–3 Myr) Upper Scorpius (5–10 star-forming search for correlations between properties, as well disk inclination accretion luminosity. Methods. identified eight distinct profile types sample. fitted Gaussian curves absorption and/or emission...
The Ariel space mission will characterize spectroscopically the atmospheres of a large and diverse sample hundreds exoplanets. Through study targets with wide range planetary parameters (mass, density, equilibrium temperature) host star types origin for diversity observed in known exoplanets be better understood. is an ESA Medium class science (M4) spacecraft bus developed by industry under contract to ESA, Payload provided consortium national funding agencies member states, plus...
Context . Characterising stellar jet asymmetries is key to setting robust constraints on launching models and improving our understanding of the underlying mechanisms behind launching. Aims We aim characterise asymmetric properties bipolar coming from Classical T Tauri Star Th 28. Methods combined data integral field spectroscopy with VLT/MUSE high-resolution spectra VLT/X-shooter map optical emission line ratios in both lobes. carried out a diagnostic analysis these compare density,...
Aims: The inner regions of high-mass protostars are often invisible in the near-infrared. We aim to investigate gaseous disc IRAS11101-5829 through scattered light from outflow cavity walls. Methods: observed environment young stellar object and closest knots its jet, HH135-136, with VLT/SINFONI. also retrieved archival data high-resolution long-slit spectrograph VLT/X-shooter. Results: detect first three bandheads $\upsilon=2-0$ CO vibrational emission for time this object. It is coincident...
Context. The role of bipolar jets in the formation stars, and particular how they are launched, is still not well understood. Aims. We probe protostellar jet launching mechanism using high-resolution observations near-infrared (IR) [Fe II ] λ 1.53,1.64 μ m emission lines. Methods. consider case from Classical T Tauri star, DO Tau, investigate morphology kinematics close to star (within 140 au) AO-assisted IFU GEMINI/NIFS. Results. find that brighter, blueshifted collimated very quickly after...