A5056850713- Stellar, planetary, and galactic studies
- Astrophysics and Star Formation Studies
- Astro and Planetary Science
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Molecular Spectroscopy and Structure
- Astrophysical Phenomena and Observations
- Adaptive optics and wavefront sensing
- Gamma-ray bursts and supernovae
- Calibration and Measurement Techniques
- Spectroscopy and Laser Applications
- Solar and Space Plasma Dynamics
- Cosmology and Gravitation Theories
- Galaxies: Formation, Evolution, Phenomena
- Space Exploration and Technology
- Optical Systems and Laser Technology
- Bee Products Chemical Analysis
Osservatorio Astronomico di Padova
2016-2021
University of Padua
2016-2018
Institute for Space Astrophysics and Planetology
2017-2018
National Institute for Astrophysics
2017-2018
Aims: We aim to characterize the orbital and atmospheric properties of PDS 70 b, which was first identified on May 2015 in course SHINE survey with SPHERE, extreme adaptive-optics instrument at VLT. Methods: obtained new deep SPHERE/IRDIS imaging SPHERE/IFS spectroscopic observations b. The astrometric baseline now covers 6 years allows us perform an analysis. For time, we present spectrophotometry young planet almost entire near-infrared range (0.96 3.8 micrometer). use different models...
51 Eridani b is an exoplanet around a young (20 Myr) nearby (29.4 pc) F0-type star, recently discovered by direct imaging. Being only 0.5" away from its host star it well suited for spectroscopic analysis using integral field spectrographs. We aim to refine the atmospheric properties of this and further constrain architecture system searching additional companions. Using SPHERE instrument at VLT we extend spectral coverage planet complete Y- H-band range provide photometry in K12-bands...
Understanding the diversity of planets requires to study morphology and physical conditions in protoplanetary disks which they form. We observed spatially resolved disk around ~10 Myr old HD 100453 polarized scattered light with SPHERE/VLT at optical near-infrared wavelengths, reaching an angular resolution ~0.02", inner working angle ~0.09". detect up ~0.42" (~48 au) a cavity, rim azimuthal brightness variations inclination 38 degrees, two shadows symmetric spiral arms. The arms originate...
Context. The SAO 206462 (HD 135344B) disk is one of the few known transitional disks showing asymmetric features in scattered light and thermal emission. Near-infrared scattered-light images revealed two bright outer spiral arms an inner cavity depleted dust. Giant protoplanets have been proposed to account for morphology. Aims. We aim search giant planets responsible and, case non-detection, constrain recent planet predictions using data detection limits. Methods. obtained new high-contrast...
We present observations of the Herbig Ae star HD169142 with VLT/SPHERE instruments InfraRed Dual-band Imager and Spectrograph (IRDIS) ($K1K2$ $H2H3$ bands) Integral Field (IFS) ($Y$, $J$ $H$ bands). detect several bright blobs at $\sim$180 mas separation from star, a faint arc-like structure in IFS data. Our reference differential imaging (RDI) data analysis also finds ring same separation. show, using simulation based on polarized light data, that these are actually part 180 mas. These...
The nearby and young M star AU Mic is surrounded by a debris disk in which we previously identified series of large-scale arch-like structures that have never been seen before any other move outward at high velocities. We initiated monitoring program with the following objectives: 1) track location better constrain their projected speeds, 2) search for new features emerging closer in, ultimately 3) understand mechanism responsible motion production features. was observed 11 different epochs...
Context. Debris disks correspond to the final evolutionary stage of circumstellar around young stars. Gas-deprived structures seen in debris are normally, but not always, attributed dynamical interactions planetary systems.
HD~106906AB is so far the only young binary system around which a planet has been imaged and debris disk evidenced thanks to strong IR excess. As such, it represents unique opportunity study dynamics of planetary systems. We aim at further investigating close (tens au scales) environment system. used extreme AO fed, high contrast imager SPHERE recently installed on VLT observe HD~106906. Both IRDIS Integral Field Spectrometer were used. discovered very inclined, ring-like distance 65~au from...
We search for signs of ongoing planet-disk interaction and study the distribution small grains at surface transition disk around RXJ1615.3-3255 (RX J1615). observed RXJ1615 with VLT/SPHERE. image first time in scattered light detect two arcs, rings, a gap an inner marginal evidence cavity. The shapes arcs suggest that they probably are segments full rings. Ellipse fitting rings yield inclination i = 47 \pm 2 degrees find semi-major axes 1.50 0.01" (278 au), 1.06 (196 au) 0.30 (56...
Context. The G-type star GJ504A is known to host a 3–35 M Jup companion whose temperature, mass, and projected separation all contribute making it test case for planet formation theories atmospheric models of giant planets light brown dwarfs. Aims. We aim at revisiting the system age, architecture, physical chemical properties using new complementary interferometric, radial-velocity, high-contrast imaging data. Methods. used CHARA interferometer measure GJ504A’s angular diameter obtained an...
We present observations of the known edge-on debris disk around HIP 79977 (HD 146897, F star in Upper Sco, 123 pc), taken with ZIMPOL differential polarimeter SPHERE instrument Very Broad Band filter ($\lambda_c=735$ nm, $\Delta\lambda=290$ nm) a spatial resolution about 25 mas. measure polarization flux along and perpendicular to spine highly inclined for projected separations between 0.2" (25 AU) 1.6" (200 investigate diagnostic potential such data model simulations. The polarized contrast...
The SHINE project is a 500-star survey performed with SPHERE on the VLT for purpose of directly detecting new substellar companions and understanding their formation early evolution. Here we present an initial statistical analysis subsample 150 stars that are representative full sample. Our goal to constrain frequency masses between 1 75 MJup semimajor axes 5 300 au. We adopt detection limits as function angular separation from data all converted into mass projected orbital using...
Context. Transition disks correspond to a short stage between the young protoplanetary phase and older debris phase. Along this evolutionary sequence, gas component disappears leaving room for dust-dominated environment where already-formed planets signpost their gravitational perturbations.
HD95086 (A8V, 17Myr) hosts a rare planetary system for which multi-belt debris disk and giant planet of 4-5MJup have been directly imaged. Our study aims to characterize the physical orbital properties HD95086b, search additional planets at short wide orbits image cold outer belt in scattered light. We used HARPS ESO 3.6m telescope monitor radial velocity over 2 years investigate existence less than 3au distance. With IRDIS dual-band imager IFS integral field spectrograph SPHERE VLT, we...
Young planets are expected to cause perturbations in protostellar disks that may be used infer their presence. Clear detection of still-forming embedded within gas-rich is rare. HD 169142 a very young Herbig Ae-Be star surrounded by pre-transitional disk, composed at least three rings. While claims sub-stellar objects around this have been made previously, follow-up studies remain inconclusive. We SPHERE ESO VLT obtain sequence high-contrast images the immediate surroundings over about...
The nearby Herbig Be star HD100546 is known to be a laboratory for the study of protoplanets and their relation with circumstellar disk that carved by at least 2 gaps. We observed environment high contrast imaging exploiting several different observing modes SPHERE, including datasets with/without coronagraphs, dual band imaging, integral field spectroscopy polarimetry. picture emerging from these data sets complex. Flux-conservative algorithms images clearly show up 200au. More aggressive...
HIP 65426 b is a recently discovered exoplanet imaged during the course of SPHERE-SHINE survey. Here we present new $L'$ and $M'$ observations planet from NACO instrument at VLT NACO-ISPY survey, as well $Y-H$ spectrum $K$-band photometry SPHERE-SHINE. Using these data, confirm nature companion warm, dusty with mid-L spectral type. From comparison its SED BT-Settl atmospheric models, derive best-fit effective temperature $T_{\text{eff}}=1618\pm7$ K, surface gravity $\log...
The transition disk around the T Tauri star Cha possesses a large gap, making it prime target for high-resolution imaging in context of planet formation. We aim to find signs evolutionary processes by studying geometry and dust grain properties at its surface, search companion candidates. analyze set VLT/SPHERE data near-infrared optical wavelengths. performed polarimetric with IRDIS (1.6 $\mu$m) ZIMPOL (0.5-0.9 $\mu$m), obtained intensity images from dual-band simultaneous spectro-imaging...
Context. The 51 Eridani system harbors a complex architecture with its primary star forming hierarchical the binary GJ 3305AB at projected separation of 2000 au, giant planet orbiting 13 and low-mass debris disk around possibly cold component warm inferred from spectral energy distribution. Aims. We aim to better constrain orbital parameters known planet. Methods. monitored over three years 2015 2018 VLT/SPHERE exoplanet imaging instrument. Results. measure an motion for ~130 mas slightly...
LkCa 15 hosts a pre-transitional disk as well at least one accreting protoplanet orbiting in its gap. Previous observations have focused mainly on the outer disk, which is cleared inward of ~50 au. The planet candidates, other hand, reside orbital radii around au, where been unreliable until recently. Here we present new J-band imaging polarimetry with SPHERE IRDIS, yielding most accurate and detailed scattered-light images to date down planet-hosting inner regions. We find what appear be...
With an orbital distance comparable to that of Saturn in the solar system, \bpic b is closest (semi-major axis $\simeq$\,9\,au) exoplanet has been imaged orbit a star. Thus it offers unique opportunities for detailed studies its orbital, physical, and atmospheric properties, disk-planet interactions. exception discovery observations 2003 with NaCo at Very Large Telescope (VLT), all following astrometric measurements relative have obtained southwestern part orbit, which severely limits...
Debris disks are the intrinsic by-products of star and planet formation processes. Most likely due to instrumental limitations their natural faintness, little is known about debris around low-mass stars, especially when it comes spatially resolved observations. We present new VLT/SPHERE IRDIS Dual-Polarization Imaging (DPI) observations in which we detect dust ring M2 spectral type TWA\,7. Combined with additional Angular Differential aim at a fine characterization disk setting constraints...
Aims. In this work, we characterize the low mass companion of A0 field star HR3549. Methods. We observed HR3549AB in imaging mode with NIR branch (IFS and IRDIS) SPHERE@VLT, IFS YJ IRDIS H band. also acquired a medium resolution spectrum long slit spectroscopy mode. The data were reduced using dedicated SPHERE GTO pipeline, purposely designed for instrument. employed algorithms such as PCA TLOCI to reduce speckle noise. Results. was clearly visible both IFS.We obtained photometry four...
Crucial information on the mass accretion-ejection in young stars can be obtained from high spatial resolution images of jets sources with recurrent accretion outbursts. Using SPHERE/ZIMPOL instrument, we observed binary Z CMa that is composed a Herbig Be star and FUor object, both driving jet. We analyse structure two relation previous events this target. optical Halpha OI 6300A lines at unprecedented angular ~0.03 arcsec, which have performed continuum subtraction deconvolution, thereby...