A5085573564- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Adaptive optics and wavefront sensing
- Astrophysics and Star Formation Studies
- Astronomical Observations and Instrumentation
- Astro and Planetary Science
- Antifungal resistance and susceptibility
- Gamma-ray bursts and supernovae
- Climate variability and models
- Advanced Algebra and Logic
- Solar and Space Plasma Dynamics
- Atmospheric and Environmental Gas Dynamics
- Autoimmune and Inflammatory Disorders
- Diabetes and associated disorders
- Nail Diseases and Treatments
- Autoimmune Bullous Skin Diseases
- Diabetes Management and Research
- Geophysics and Gravity Measurements
- Cryospheric studies and observations
- Molecular Spectroscopy and Structure
- Chemotherapy-related skin toxicity
- Constraint Satisfaction and Optimization
- Breast Lesions and Carcinomas
- Traumatic Brain Injury and Neurovascular Disturbances
- Medication Adherence and Compliance
Barcelona Supercomputing Center
2023-2024
Universitat Politècnica de Catalunya
2023
Telescopio Nazionale Galileo
2012-2020
Université Grenoble Alpes
2017-2019
Institut de Planétologie et d'Astrophysique de Grenoble
2018-2019
University of Liège
2014-2018
Nueva Opción
2018
Laboratoire d’Études en Géophysique et Océanographie Spatiales
2017
Hospital General San Jorge
2015-2016
Goethe University Frankfurt
1999
The Telescopio Nazionale Galileo (TNG)[9] hosts, starting in April 2012, the visible spectrograph HARPS-N. It is based on design of its predecessor working at ESO's 3.6m telescope, achieving unprecedented results radial velocity measurements extrasolar planetary systems. spectrograph's ultra-stable environment, a temperature-controlled vacuum chamber, will allow under 1 m/s which enable characterization rocky, Earth-like planets. Enhancements from original HARPS include better scrambling...
We present the Vortex Image Processing (VIP) library, a python package dedicated to astronomical high-contrast imaging. Our relies on extensive stack of scientific libraries and aims provide flexible framework for data image processing. In this paper, we describe capabilities VIP related processing sequences acquired using angular differential imaging (ADI) observing technique. implements functionalities building pipelines, encompass- ing pre- post-processing algorithms, potential sources...
Uncovering the ingredients and architecture of planetary systems is a very active field research that has fuelled many new theories on giant planet formation, migration, composition, interaction with circumstellar environment. We aim at discovering studying such systems, to further expand our knowledge how low-mass companions form evolve. obtained high-contrast H-band images environment F5V star HD206893, known host debris disc never detected in scattered light. These observations are part...
Direct imaging of exoplanets and circumstellar disks at optical infrared wavelengths requires reaching high contrasts short angular separations.This can only be achieved through the synergy advanced instrumentation, such as adaptive optics coronagraphy, with a relevant combination observing strategy post-processing algorithms to model subtract residual starlight.In this context, VIP is Python package providing tools reduce, post-process analyze high-contrast datasets, enabling detection...
ABSTRACT An optical vortex coronagraph has been implemented within the NIRC2 camera on Keck II telescope and used to carry out on-sky tests observations. The development of this new L ′-band observational mode is described, an initial demonstration capability presented: a resolved image low-mass companion HIP 79124, which had previously detected by means interferometry. With 79124 B at projected separation 186.5 mas, both small inner working angle related imaging improvements were crucial in...
Context. The direct detection of exoplanets with high-contrast imaging requires advanced data processing methods to disentangle potential planetary signals from bright quasi-static speckles. Among them, angular differential (ADI) permits a known rotation rate be separated instrumental speckles that are either statics or slowly variable. method presented in this paper, called ANDROMEDA for ANgular Differential OptiMal Exoplanet Detection Algorithm is based on maximum likelihood approach ADI...
Context. Post-processing algorithms play a key role in pushing the detection limits of high-contrast imaging (HCI) instruments. State-of-the-art image processing approaches for HCI enable production science-ready images relying on unsupervised learning techniques, such as low-rank approximations, generating model point spread function (PSF) and subtracting residual starlight speckle noise. Aims. In order to maximize rate instruments survey campaigns, advanced with higher sensitivities faint...
Abstract Distinct gap features in the nearest protoplanetary disk, TW Hya (distance of 59.5 ± 0.9 pc), may be signposts ongoing planet formation. We performed long-exposure thermal infrared coronagraphic imaging observations to search for accreting planets, especially within dust gaps previously detected scattered light and submillimeter-wave emission. Three nights with Keck/NIRC2 vortex coronagraph L ′ (3.4–4.1 μ m) did not reveal any statistically significant point sources. thereby set...
Abstract We present the most sensitive direct imaging and radial velocity (RV) exploration of ϵ Eridani to date. is an adolescent planetary system, reminiscent early solar system. It surrounded by a prominent complex debris disk that likely stirred one or several gas giant exoplanets. The discovery RV signature exoplanet was announced 15 yr ago, but has met with scrutiny due possible confusion stellar noise. confirm planet new compilation analysis precise data spanning 30 yr, combine it...
HR8799 is orbited by at least four giant planets, making it a prime target for the recently commissioned Spectro-Polarimetric High-contrast Exoplanet REsearch (VLT/SPHERE). As such, was observed on five consecutive nights during SPHERE science verification in December 2014. We aim to take full advantage of capabilities derive accurate astrometric measurements based H-band images acquired with Infra-Red Dual-band Imaging and Spectroscopy (IRDIS) subsystem, explore ultimate performance this...
Context. The existence of hot Jupiters is still not well understood. Two main channels are thought to be responsible for their current location: a smooth planet migration through the protoplanetary disk or circularization an initial highly eccentric orbit by tidal dissipation leading strong decrease in semimajor axis. Different formation scenarios result different observable effects, such as orbital parameters (obliquity and eccentricity) frequency planets at stellar ages. Aims. In context...
Transition disks offer the extraordinary opportunity to look for newly born planets and investigate early stages of planet formation. In this context we observed Herbig A5 star MWC 758 with L band vector vortex coronagraph installed in near-infrared camera spectrograph NIRC2 at Keck II telescope, aim unveiling nature spiral structure by constraining presence planetary companions system. Our high-contrast imaging observations show a bright (delta L=7.0+/-0.3 mag) point-like emission, south...
view Abstract Citations (111) References (88) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The RIASS Coronathon: Joint X-Ray and Ultraviolet Observations of Normal F--K Stars Ayres, Thomas R. ; Fleming, T. A. Simon, Haisch, B. M. Brown, Lenz, D. Wamsteker, W. de Martino, Gonzalez, C. Bonnell, J. Mas-Hesse, Rosso, Schmitt, H. Truemper, Voges, Pye, Dempsey, Linsky, L. Guinan, E. F. Harper, G. Jordan, Montesinos, Pagano, I. Rodono, Between 1990 August 1991...
We present the first resolved image of debris disk around 16+/-8 Myr old star, HD 114082. The observation was made in H-band using SPHERE instrument. star is at a distance 92+/-6 pc Lower Centaurus Crux association. Using Markov Chain Monte Carlo analysis, we determined that likely form dust ring with an inner edge 27.7+2.8/-3.5 au, position angle -74+0.5/-1.5 deg, and inclination respect to line sight 6.7+3.8/-0.4 deg. imaged scattered light has surface density declining radius like...
Data processing constitutes a critical component of high-contrast exoplanet imaging. Its role is almost as important the choice coronagraph or wavefront control system, and it intertwined with chosen observing strategy. Among data techniques for angular differential imaging (ADI), most recent family principal analysis (PCA) based algorithms. PCA serves, in this case, subspace projection technique constructing reference point spread function (PSF) that can be subtracted from science boosting...
As planning for the next generation of high contrast imaging instruments (e.g. WFIRST, HabEx, and LUVOIR, TMT-PFI, EELT-EPICS) matures, second-generation ground-based extreme adaptive optics facilities VLT-SPHERE, Gemini-GPI) are halfway through their principal surveys, it is imperative that performance different designs, post-processing algorithms, observing strategies, survey results be compared in a consistent, statistically robust framework. In this paper, we argue current industry...
HD 141569 A is a pre-main sequence B9.5 Ve star surrounded by prominent and complex circumstellar disk, likely still in transition stage from protoplanetary to debris disk phase. Here, we present new image of the third inner component made L' band (3.8 micron) during commissioning vector vortex coronagraph recently installed near-infrared imager spectrograph NIRC2 behind W.M. Keck Observatory II adaptive optics system. We used reference point spread function subtraction, which reveals...
Direct imaging of exoplanets is a challenging task as it requires to reach high contrast at very close separation the star. Today, main limitation in high-contrast images quasi-static speckles that are created by residual instrumental aberrations. They have same angular size planetary companions and often brighter, hence hindering our capability detect exoplanets. Dedicated observation strategies signal processing techniques necessary disentangle these from signals. The output methods...
Abstract Reference star differential imaging (RDI) is a powerful strategy for high-contrast imaging. Using example observations taken with the vortex coronagraph mode of Keck/NIRC2 in L ′ band, we demonstrate that RDI provides improved sensitivity to point sources at small angular separations compared (ADI). Applying images low-mass stellar companions HIP 79124 C (192 mas separation, Δ = 4.01) and 78233 B (141 4.78), latter first detection, increases significance their detections by up...
For several years, we have been developing vortex phase masks based on sub-wavelength gratings, known as Annular Groove Phase Masks. Etched onto diamond substrates, these AGPMs are currently designed to be used in the thermal infrared (ranging from 3 13 μm). Our were first installed VLT/NACO and VLT/VISIR 2012, followed by LBT/LMIRCam 2013 Keck/NIRC2 2015. In this paper, review development, commissioning, on-sky performance, early scientific results of new coronagraphic modes report lessons...
Abstract A common task in Earth Sciences is to infer climate information at local and regional scales from global models. Dynamical downscaling requires running expensive numerical models high resolution, which can be prohibitive due long model runtimes. On the other hand, statistical techniques present an alternative approach for learning links between large- local-scale a more efficient way. large number of deep neural network-based approaches have been proposed recent years, mostly based...
Context. Stellar activity is currently challenging the detection of young planets via radial velocity (RV) technique. Aims. We attempt to definitively discriminate nature RV variations for active K5 star BD+20 1790, which visible (VIS) measurements show divergent results on existence a substellar companion. Methods. compare VIS data with high precision RVs in near-infrared (NIR) range by using GIANO–B and IGRINS spectrographs. In addition, we present first time simultaneous VIS-NIR...