A5076557710- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Molecular Spectroscopy and Structure
- Gamma-ray bursts and supernovae
- Space Exploration and Technology
- Spectroscopy and Laser Applications
- Galaxies: Formation, Evolution, Phenomena
- Adaptive optics and wavefront sensing
- Astrophysics and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Systemic Lupus Erythematosus Research
- Phase Equilibria and Thermodynamics
- Solar and Space Plasma Dynamics
- Atomic and Molecular Physics
- Scientific Research and Discoveries
- Thermodynamic properties of mixtures
- Pulsars and Gravitational Waves Research
- Metabolomics and Mass Spectrometry Studies
- Geophysics and Sensor Technology
- Mass Spectrometry Techniques and Applications
- Atmospheric Ozone and Climate
Astronomical Observatory of Capodimonte
2015-2024
National Institute for Astrophysics
2006-2023
Institute for Space Astrophysics and Planetology
2013
Thüringer Landessternwarte Tautenburg
2009
Max Planck Institute for Astronomy
2009
Osservatorio Astrofisico di Catania
2009
Ege University
2009
National Institute of Astrophysics, Optics and Electronics
1996-1999
Max Planck Institute for Extraterrestrial Physics
1996-1997
Universidad Nacional Autónoma de México
1987
(Abridged) The c2d Spitzer Legacy project obtained images and photometry with both IRAC MIPS instruments for five large, nearby molecular clouds. This paper combines information drawn from studies of individual clouds into a combined updated statistical analysis star formation rates efficiencies, numbers lifetimes SED classes, clustering properties. Current efficiencies range 3% to 6%. Taken together, the are producing about 260 solar masses stars per Myr. surface density is more than an...
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...
We present X-Shooter/VLT observations of a sample 36 accreting low-mass stellar and sub-stellar objects (YSOs) in the Lupus star forming region, spanning range mass from ~0.03 to ~1.2Msun, but mostly with 0.1Msun < Mstar 0.5Msun. Our aim is twofold: firstly, analyse relationship between excess-continuum line emission accretion diagnostics, and, secondly, investigate properties terms physical central object. The luminosity (Lacc), it rate (Macc), derived by modelling excess emission, UV...
We present high-quality, medium resolution X-shooter/VLT spectra in the range 300-2500 nm for a sample of 12 very low-mass stars \sigma Orionis cluster. The includes with masses ranging from 0.08 to 0.3 M$_\odot$. aim this first paper is investigate reliability many accretion tracers currently used measure mass rate low-mass, young stars. use our luminosity continuum excess emission UV and visual; derived rates 10$^{-9}$ M$_{\odot}$ yr$^{-1}$ down 5$\times10^{-11}$ yr$^{-1}$, allowing us...
Context. The lack of knowledge photospheric parameters and the level chromospheric activity in young low-mass pre-main sequence stars introduces uncertainties when measuring mass accretion rates accreting (Class II) Young Stellar Objects. A detailed investigation effect emission on estimates rate is still missing. This can be undertaken using samples diskless III) K M-type stars. Aims. Our goal to measure Class III pre main determine its luminosity (Lacc) (Macc) stellar objects with disks....
The dependence of the mass accretion rate on stellar properties is a key constraint for star formation and disk evolution studies. Here we present study sample stars in Chamaeleon I forming region carried out using VLT/X-Shooter spectrograph. nearly complete down to M~0.1Msun young still harboring this region. We derive parameters self-consistent method fit broad-band flux-calibrated medium resolution spectrum. correlation between luminosity luminosity, logarithmic plane yields slopes 1.9...
Understanding how disks dissipate is essential to studies of planet formation. However, identifying exactly dust and gas dissipates complicated due difficulty in finding objects clearly the transition losing their surrounding material. We use Spitzer IRS spectra examine 35 photometrically-selected candidate cold (disks with large inner holes). The infrared are supplemented optical determine stellar accretion properties 1.3mm photometry measure disk masses. Based on detailed SED modeling, we...
A long-term multi-purpose observational programme has started with HARPS-N@TNG aimed to characterise the global architectural properties of exoplanetary systems. In this first paper we fully transiting system Qatar-1. We exploit HARPS-N high-precision radial velocity measurements obtained during a transit measure Rossiter-McLaughlin effect in Qatar-1 system, and out-of-transit redetermine spectroscopic orbit. New photometric light-curves are analysed characterisation host star atmospheric...
A relation between the mass accretion rate onto central young star and of surrounding protoplanetary disk has long been theoretically predicted observationally sought. For first time, we have accurately homogeneously determined photospheric parameters, rate, for an essentially complete sample stars with disks in Lupus clouds. Our work combines results surveys conducted VLT/X-Shooter ALMA. With this dataset are able to test a basic prediction viscous theory, existence linear total mass. We...
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...
In recent years, the disk populations in a number of young star-forming regions have been surveyed with ALMA. Understanding properties and their correlation those central star is critical to understand planet formation. particular, decrease average measured dust mass age region has observed. We conducted high-sensitivity continuum ALMA observations 43 Class II stellar objects CrA at 1.3 mm (230 GHz). The typical spatial resolution 0.3". fluxes are used estimate masses disks, survival...
Context. Large surveys with new-generation high-contrast imaging instruments are needed to derive the frequency and properties of exoplanet populations separations from ~5 300 au. A careful assessment stellar is crucial for a proper understanding when, where, how frequently planets form, they evolve. The sensitivity detection limits age makes this key parameter direct surveys. Aims. We describe SpHere INfrared survey Exoplanets (SHINE), largest planet-search campaign initiated at VLT in 2015...
We present c2d Spitzer/IRAC observations of the Lupus I, III and IV dark clouds discuss them in combination with optical near-infrared MIPS data. With Spitzer data, new sample contains 159 stars, 4 times larger than previous one. It is dominated by low- very-low mass stars it complete down to M $\approx$ 0.1M$_\odot$. find 30-40 % binaries separations between 100 2000 AU no apparent effect disk properties members. A large majority objects are Class II or objects, only 20 (12%) I Flat...
We present stellar parameters and abundances of 11 elements (Li, Na, Mg, Al, Si, Ca, Ti, Cr, Fe, Ni Zn) 13 F6–K2 main-sequence stars in the young groups AB Doradus, Carina Near Ursa Major. The exoplanet-host star ι Horologii is also analysed.
Young, nearby stars are ideal targets to search for planets using the direct imaging technique. The determination of stellar parameters is crucial interpretation survey results particularly since luminosity substellar objects has a strong dependence on system age. We have conducted large program with NaCo at VLT in order and brown dwarfs wide orbits around 86 stars. A fraction observed were poorly investigated literature. performed study characterize fundamental properties (age, distance,...
Disks around T Tauri stars are known to lose mass, as best shown by the profiles of forbidden emission lines low ionization species. At least two separate kinematic components have been identified, one characterised velocity shifts tens hundreds km/s (HVC) and with much lower few (LVC). The HVC convincingly associated jets, but origin LVC is still unknown. In this paper we analyze line spectrum a sample 44 mostly mass young in Lupus $\sigma$-Ori observed X-Shooter ESO spectrometer. We detect...
A homogeneous determination of basic stellar parameters young object (YSO) candidates is needed to confirm their evolutionary stage, membership star forming regions (SFRs), and get reliable values the quantities related chromospheric activity accretion. We used code ROTFIT synthetic BT-Settl spectra for atmospheric (Teff logg), veiling, radial (RV) projected rotational velocity (vsini), from X-Shooter 102 YSO in Lupus SFR. have shown that 13 can be rejected as members based on discrepant RV...