R. C. Boufleur
A5084067343- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Isotope Analysis in Ecology
- Gamma-ray bursts and supernovae
- Astronomy and Astrophysical Research
- Astronomical Observations and Instrumentation
- Solar and Space Plasma Dynamics
- Atmospheric Ozone and Climate
- Geological and Geochemical Analysis
- Adaptive optics and wavefront sensing
- Planetary Science and Exploration
- Mathematics and Applications
- Blind Source Separation Techniques
- Geometry and complex manifolds
- High-pressure geophysics and materials
- Space Exploration and Technology
- Inertial Sensor and Navigation
- Geometric and Algebraic Topology
- Geology and Paleoclimatology Research
- Chemical and Environmental Engineering Research
- History and Theory of Mathematics
- Advanced Database Systems and Queries
- SAS software applications and methods
Laboratório Interinstitucional de e-Astronomia
2019-2025
National Observatory
2012-2025
Valongo Observatory
2023
Jupiter Trojans preserve primitive formation characteristics owing to their collisionless, stable orbits. Determination of shapes and size-frequency distribution helps constrain the collisional evolution parent population, which also originated Kuiper Belt. We started a programme find precise sizes/shapes for Trojans, combining stellar occultations Database Asteroid Models from Inversion Techniques (DAMIT) three-dimensional shape models. report results Diomedes, by fitting its unit...
The stellar occultation technique provides competitive accuracy in determining the sizes, shapes, astrometry, etc., of occulting body, comparable to in-situ observations by spacecraft. With increase number known Solar System objects expected from LSST, highly precise astrometric catalogues, such as Gaia, and improvement ephemerides, occultations will become more common with a higher chords each observation. In context Big Data era, we developed SORA, an open-source python library reduce...
Abstract We identified known Trans-Neptunian Objects (TNOs) and Centaurs in the complete Dark Energy Survey (DES) year six catalog (DES Y6) through Sky Body Tracker (SkyBoT) tool. classified our dataset of 144 objects into a widely used 4-class taxonomic system TNOs. No such previous classification was available literature for most these objects. From absolute magnitudes average albedos, an estimation diameters all is obtained. Correlations involving colours, orbital parameters, dynamical...
We present MCDA, a modification of the CoRoT detrend algorithm (CDA) suitable to chromatic light curves. By means robust statistics and better handling short term variability, implementation decreases systematic curve variations improves detection exoplanets when compared with original algorithm. All curves (a total 65,655) were analysed our Dozens new transit candidates all previously known rediscovered in those using box-fitting For three cases spectroscopic measurements candidates' host...
Context. The physical characterization of trans-Neptunian objects is essential for improving our understanding the formation and evolution Solar System. Stellar occultation a ground-based technique that can be successfully used to determine some TNOs’ fundamental properties with high precision, such as size shape. Aims. This work aimed at constraining size, shape, geometric albedo dwarf planet candidate (307261) 2002 MS 4 through analysis nine stellar events. Using multichord detection, we...
We present results from the first recorded stellar occultation by large trans-Neptunian object (174567) Varda that was observed on September 10$^{\rm th}$, 2018. belongs to high-inclination dynamically excited population, and has a satellite, Ilmar\"e, which is half size of Varda. determine albedo constrain its 3D shape density. Thirteen different sites in USA monitored event, five detected an main body. A best-fitting ellipse chords provides instantaneous limb body, geometric computed. The...
Context . Trans-Neptunian objects (TNOs) are considered to be among the most primitive in our Solar System. Knowledge of their primary physical properties is essential for understanding origin and evolution outer In this context, stellar occultations a powerful sensitive technique studying these distant faint objects. Aims We aim obtain size, shape, absolute magnitude, geometric albedo TNO (143707) 2003 UY 117 Methods predicted occultation by 2020 October 23 UT ran specific campaign...
Trans-Neptunian objects (TNOs) are considered to be among the most primitive in our Solar System. Knowledge of their primary physical properties is essential for understanding origin and evolution outer We predicted a stellar occultation by this TNO 2020 October 23 UT ran specific campaign investigate event. derived projected profile shape size from observations means an elliptical fit chords. also performed photometric (143707) 2003 UY117 obtain absolute magnitude rotational period observed...
Jupiter Trojans preserve primitive formation characteristics due to their collisionless stable orbits. Determination of shapes and size-frequency distribution constrains the collisional evolution parent population which also originated Kuiper Belt. We started a program find precise sizes/shapes for Trojans, combining stellar occultations DAMIT 3D shape models. report results Diomedes, by fitting its dimensionless model 3 chords occultation observed in 2020, using iterative $\chi^{2}$...
Context. Bright stellar positions are now known with an uncertainty below 1 mas thanks to Gaia DR2. Between 2019-2020, the Galactic plane will be background of Jupiter. The dense lead increase in number occultations, while DR2 catalogue reduce prediction uncertainties for shadow path. Aims. We observed a occultation by Galilean moon Europa (J2) and propose campaign observing occultations all moons. Methods. During predicted period time, we measured light flux occulted star object determine...
This work aims at constraining the size, shape, and geometric albedo of dwarf planet candidate 2002 MS4 through analysis nine stellar occultation events. Using multichord detection, we also studied object's topography by analyzing obtained limb residuals between observed chords best-fitted ellipse. We predicted organized observational campaigns occultations 2019 2022, resulting in two single-chord events, four double-chord detections, three events with to up sixty-one positive chords. 13...
ABSTRACT While proper orbital elements are currently available for more than 1 million asteroids, taxonomical information is still lagging behind. Surveys like SDSS-MOC4 provided preliminary 100 000 objects, but many asteroids lack even a basic taxonomy. In this study, we use Dark Energy Survey (DES) data to provide new on asteroid physical properties. By cross-correlating the DES base with other bases, investigate how taxonomy reflected in data. resolution of not sufficient distinguish...
Abstract Non gaussian sources of erros need to be taken into consideration when searching for planetary transits. Such phenomena are mostly caused by the impact high energetic particles on detector (Pinheiro da Silva et al . 2008). The detection efficiency transits, therefor, depend significantly data quality and algorithms utilized deal with these errors sources. In this work we show that a modified detrend algorithm CDA (CoRoT Detrend Algorithm; Mislis 2010) using robust statistics an...
AbstractTransneptunian Objects (TNOs) are the remnants of our planetary system and can retain information about early stages Solar System formation. Stellar occultation is a ground-based method used to study these distant bodies which have been presenting exciting results mainly their physical properties. The big TNO called 2002 MS4 was discovered by Trujillo, C. A., & Brown, M. E., in using observations made at Palomar Observatory (EUA). It classified as hot classical TNO, with...
Context. The Centaur (10199) Chariklo has the first ring system discovered around a small object. It was observed using stellar occultation in 2013. Stellar occultations allow sizes and shapes to be determined with kilometre accuracy, provide characteristics of occulting object its vicinity. Aims. Using between 2017 2020, our aim is constrain physical parameters rings. We also determine structure rings, obtain precise astrometrical positions Chariklo. Methods. predicted organised several...