A5032448792- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Pulsars and Gravitational Waves Research
- Stellar, planetary, and galactic studies
- Astrophysics and Cosmic Phenomena
- Astro and Planetary Science
- Astrophysics and Star Formation Studies
- Geophysics and Gravity Measurements
- Astronomical Observations and Instrumentation
- Solar and Space Plasma Dynamics
- Magnetic confinement fusion research
- Astronomy and Astrophysical Research
- Atmospheric Ozone and Climate
- Radio Astronomy Observations and Technology
- Planetary Science and Exploration
- Cardiovascular Disease and Adiposity
- Galaxies: Formation, Evolution, Phenomena
- Inertial Sensor and Navigation
- Mechanics and Biomechanics Studies
- Medical Imaging Techniques and Applications
- Radiation Detection and Scintillator Technologies
- GNSS positioning and interference
- Laser-induced spectroscopy and plasma
- Gyrotron and Vacuum Electronics Research
- Calibration and Measurement Techniques
Agenzia Spaziale Italiana
2020-2023
Rutherford Appleton Laboratory
2012-2023
Astronomical Observatory of Rome
2010-2020
National Institute for Astrophysics
2009-2018
University of Strathclyde
2012
University of Rome Tor Vergata
2009-2010
Aims. In the framework of GIARPS High-resolution Observations T Tauri stars (GHOsT) project, we study accretion properties 37 classical Taurus-Auriga star-forming region (SFR) with aim characterizing their relation central star, jets and disk winds, global structure, in synergy complementary ALMA millimeter observations. Methods. We derive stellar parameters, optical veiling, luminosity ( L acc ), mass rate Ṁ ) a homogeneous self-consistent way using high-resolution spectra acquired at...
We report the results of decade-long (2008-2018) $\gamma$-ray to 1 GHz radio monitoring blazar 3C 279, including GASP/WEBT, $\it{Fermi}$ and $\it{Swift}$ data, as well polarimetric spectroscopic data. The X-ray light curves correlate well, with no delay > 3 hours, implying general co-spatiality emission regions. $\gamma$-ray-optical flux-flux relation changes activity state, ranging from a linear more complex dependence. behaviour Stokes parameters at optical wavelengths, 43 VLBA images,...
Short Gamma-Ray Bursts (SGRBs) are produced by the coalescence of compact binary systems which remnants massive stars. GRB 160410A is classified as a short-duration with extended emission and currently farthest SGRB redshift determined from an afterglow spectrum also one brightest SGRBs to date. The fast reaction Neil Gehrels Swift Observatory alert allowed us obtain using X-shooter spectrograph at Very Large Telescope (VLT). shows several absorption features z=1.7177, in addition, we detect...
IGRJ18410-0535 is a supergiant fast X-ray transients. This subclass of binaries typically undergoes few- hour-long outbursts reaching luminosities 10^(36)-10^(37) erg/s, the occurrence which has been ascribed to combined effect intense magnetic field and rotation compact object hosted in them and/or presence dense structures ("clumps") wind their companion. IGR J18410-0535 was observed for 45 ks by XMM-Newton as part program designed study quiescent emission transients clarify origin...
Context. Supergiant fast X-ray transients are a subclass of high mass binaries that host neutron star accreting from the wind its OB supergiant companion. They characterized by an extremely pronounced and rapid variability in X-rays, which still lacks unambiguous interpretation. A number deep pointed observations with XMM-Newton have been carried out to study quiescent emission these sources gain insight into mechanism causes their variability. Aims. We continued this using three two...
We report on the variability of a multi-component broad absorption line (BAL) system observed in hyper-luminous quasar J1538+0855 at z = 3.6. Observations from Sloan Digital Sky Survey (SDSS), Very Large Telescope (VLT), Binocular (LBT), and Subaru telescope taken five different epochs, spanning 17 yr frame, are presented. detect three (A, B, C) CIV variable troughs exhibiting extreme velocities (∼40 000–54 000 km s −1 ) similar to ultra-fast outflows (UFOs) typically X-ray spectra. The A...
We present a multiwavelength study of the flat-spectrum radio quasar CTA 102 during 2013-2017. use radio-to-optical data obtained by Whole Earth Blazar Telescope, 15 GHz from Owens Valley Radio Observatory, 91 and 103 Atacama Large Millimeter Array, near-infrared Rapid Eye Monitor telescope, as well Swift (optical-UV X-rays) Fermi ($\gamma$ rays) satellites to flux spectral variability correlation between changes at different wavelengths. Unprecedented $\gamma$-ray flaring activity was...
We observed GRB190114C (redshift z = 0.4245), the first GRB ever detected at TeV energies, optical and near-infrared wavelengths with several ground-based telescopes Hubble Space Telescope, primary goal of studying its underlying supernova, SN2019jrj. The monitoring spanned time interval between 1.3 370 days after burst, in observer frame. find that afterglow emission can be modelled a forward shock propagating uniform medium modified by time-variable extinction along line sight. A jet break...
We present an optical/near-IR survey of 11 variable young stars (EXors and EXor candidates) aimed at deriving monitoring their accretion properties. About 30 optical near-infrared spectra ($\Re$ $\sim$ 1500-2000) were collected between 2014-2019 with the Large Binocular Telescope (LBT). From spectral analysis we have derived luminosity mass rate, visual extinction, temperature density permitted line formation region, signature outflowing matter. Two sources (ASASSN-13db iPTF15afq) been...
<i>Aims. <i/> The supergiant fast X-ray transient source IGR J16479-4514 was observed in outburst two times with <i>Swift<i/>. Its quiescent state investigated in-depth only once 2008 through a relatively long pointed observation <i>XMM-Newton<i/>. latter taken about 1.7 days after the 2008, and showed an eclipse-like event, likely caused by companion. At present, this is that displayed evidence for eclipse.<i>Methods. <i/>Here we carry out comparison between most recent of J16479-4514,...
The smallest extreme-ultraviolet (EUV) brightening events that were detected so far, called campfires, have recently been uncovered by the High Resolution EUV telescope (HRIEUV), which is part of Extreme Ultraviolet Imager (EUI) on board Solar Orbiter. HRIEUV has a broad bandpass centered at 17.4 nm dominated Fe ix and x emission about 1 MK. We study thermal properties EUI simultaneously observing their responses different wavelengths using spectral data from Spectral Imaging Coronal...
We present new results of the observing program which is a part NEOROCKS project aimed to improve knowledge on physical properties near-Earth Objects (NEOs) for planetary defense. Photometric observations were performed using 1.2m telescope at Haute-Provence observatory (France) in BVRI filters Johnson-Cousins photometric systems between June 2021 and April 2022. obtained surface colors 42 NEOs. Based measured we classified 20 objects as S-complex, 9 C-complex, X-complex, 2 D-type, one...
IGR J18483-0311 was discovered with INTEGRAL in 2003 and later classified as a supergiant fast X-ray transient. It observed outburst many times, but its quiescent state is still poorly known. Here we present the results of XMM-Newton, Swift, Chandra observations IGRJ18483-0311. These data improved position source, provided new information on timing spectral properties quiescence. We report detection pulsations emission this give for first time measurement spin-period derivative source. In...
Abstract After a quiescence period of about 10 years, the classical EXor source V1118 Ori has undergone an accretion outburst in 2015 September. The maximum brightness ( <?CDATA ${\rm{\Delta }}V\gtrsim 4$?> mag) was reached December and maintained for several months. Since 2016 September, is declining phase. Photometry low/high-resolution spectroscopy were obtained with MODS LUCI2 at Large Binocular Telescope , facilities Asiago 1.22 1.82 m telescopes, GIANO Telescopio Nazionale Galileo ....
Aims. The joint use of SoHO Solar Ultraviolet Measurement Emitted Radiation (SUMER), Coronal Diagnostic Spectrometer (CDS) and Hinode Extreme-ultraviolet Imaging (EIS) allow observation several O iv line ratios, useful for temperature plasma diagnostics. Accurate atomic data are required to avoid interpretation errors in deriving the electron from these ratios. Muglach et al. (2010) found that measured ratio I(787.72 Å)/I(279.93 Å) is lower than predicted value by a factor 2–5. Here this...
V1118 Ori is a classical EXor source whose light curve has been monitored over the past thirty years (although not continuously). It underwent powerful outburst in 2005, followed by ten of quiescence and less intense 2015. In 2019, new brightness increase was observed ($\Delta g$ $\sim$ 3 mag). This accretion episode offers opportunity to compare photometric spectroscopic properties different outbursts same source. allows one highlight differences similarities among events removing any...
ABSTRACT We report the results we derived analyzing photometric measurements obtained at different phase angles for 15 Near-Earth Objects (NEOs), observed from Campo Imperatore observatory, and Observatório Astronômico do Sertão de Itaparica (OASI). The performed analysis allows us to taxonomically classify them using several independent techniques, thus constraining their surface composition. majority of this sample is in agreement with a pristine carbonaceous composition (C-complex/D-type...
Aim. The unusual transient ATLAS17aeu was serendipitously detected within the sky localisation of gravitational wave trigger GW170104. importance a possible association with waves coming from binary black hole merger led to an extensive follow-up campaign, aim assessing connection Methods. With several telescopes, we carried out both photometric and spectroscopic observations ATLAS17aeu, for epochs, between $\sim 3$ 230$ days after first detection. Results. We studied in detail temporal...
We report here on the XMM-Newton observations of three supergiant fast X-ray transients (SFXT) XTE J1739-302, IGRJ08408-4503, and IGRJ18410-0535. For latter source we only discuss some preliminary results our data analysis. Some interpretation is provided for timing spectral behavior sources in terms different theoretical models proposed so far to interpret SFXTs.