Joseph Chatelain
A5076115916- Particle Detector Development and Performance
- Astro and Planetary Science
- Particle physics theoretical and experimental studies
- Planetary Science and Exploration
- Stellar, planetary, and galactic studies
- Radiation Detection and Scintillator Technologies
- Gamma-ray bursts and supernovae
- Isotope Analysis in Ecology
- Astronomy and Astrophysical Research
- Dark Matter and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Muon and positron interactions and applications
- Superconducting Materials and Applications
- High-Energy Particle Collisions Research
- Particle Accelerators and Free-Electron Lasers
- Neutrino Physics Research
- Atmospheric Ozone and Climate
- Space Satellite Systems and Control
- Spacecraft and Cryogenic Technologies
- Astrophysics and Cosmic Phenomena
- Historical Astronomy and Related Studies
- Pulsars and Gravitational Waves Research
- Classical Antiquity Studies
- Mass Spectrometry Techniques and Applications
- Adaptive optics and wavefront sensing
Las Cumbres Observatory Global Telescope Network
2019-2024
Campbell Collaboration
2022
Georgia State University
2016
Northern Arizona University
2016
European Organization for Nuclear Research
1998-2013
Institute of Electrical and Electronics Engineers
2011
Louisiana State University
2010
Abstract We present results of the largest, most comprehensive study ever done stellar multiplicity common stars in Galaxy, red dwarfs. have conducted an all-sky volume-limited survey for companions to 1120 M dwarf primaries known lie within 25 pc Sun via trigonometric parallaxes. In addition a literature search, were explored new surveys at separations 2″–300″. A reconnaissance wide 300″ was blinking archival images. I -band images used search our sample 2″–180″. Various astrometric and...
Abstract The Double Asteroid Redirection Test (DART) spacecraft successfully performed the first test of a kinetic impactor for asteroid deflection by impacting Dimorphos, secondary near-Earth binary (65803) Didymos, and changing orbital period Dimorphos. A change in approximately 7 min was expected if incident momentum from DART directly transferred to target perfectly inelastic collision 1 , but studies probable impact conditions properties indicated that considerable enhancement ( β )...
Abstract NASA's Double Asteroid Redirection Test (DART) mission was the first to demonstrate asteroid deflection, and mission's Level 1 requirements guided its planetary defense investigations. Here, we summarize DART's achievement of those requirements. On 2022 September 26, DART spacecraft impacted Dimorphos, secondary member Didymos near-Earth binary system, demonstrating an autonomously navigated kinetic impact into with limited prior knowledge for defense. Months subsequent Earth-based...
SN 2007od exhibits characteristics that have rarely been seen in a Type IIP supernova (SN). Optical V band photometry reveals very steep brightness decline between the plateau and nebular phases of ~4.5 mag, likely due to containing low mass 56Ni. The optical spectra show an evolution from normal with broad Halpha emission, complex, four component emission profile exhibiting asymmetries caused by dust extinction after day 232. This is similar spectral IIn 1998S, although no early-time narrow...
Abstract On 2022 September 26, the Double Asteroid Redirection Test (DART) spacecraft impacted Dimorphos, satellite of binary near-Earth asteroid (65803) Didymos. This demonstrated efficacy a kinetic impactor for planetary defense by changing orbital period Dimorphos 33 minutes. Measuring change relied heavily on coordinated campaign lightcurve photometry designed to detect mutual events (occultations and eclipses) as direct probe satellite’s period. A total 28 telescopes contributed 224...
Abstract The impact of the Double Asteroid Redirection Test spacecraft into Dimorphos, moon asteroid Didymos, changed Dimorphos’s orbit substantially, largely from ejection material. We present results 12 Earth-based facilities involved in a world-wide campaign to monitor brightness and morphology ejecta first 35 days after impact. After an initial brightening ∼1.4 mag, we find consistent dimming rates 0.11–0.12 mag day −1 week, 0.08–0.09 over entire study period. system returned its...
The muon detection system of the Compact Muon Solenoid experiment at CERN Large Hadron Collider is based on different technologies for tracking and triggering. In particular, in endcap disks detector consists Resistive Plate Chambers triggering Cathode Strip tracking. At present, only partially instrumented with very forward region remaining uncovered. view a possible future extension system, we report feasibility study use Micro-Pattern Gas Detectors, particular Electron Multipliers, both...
Abstract The world’s first planetary defense test mission was carried out in late 2022 by NASA’s Double Asteroid Redirection Test (DART) mission. main DART spacecraft, which accompanied the ASI-provided LICIACube cubesat, intentionally impacted Dimorphos, smaller secondary of near-Earth object binary system (65803) Didymos, on September 26. impact released a large amount ejecta, which, combined with spacecraft’s momentum, produced observed 33 ± 1 minute period change that subsequently from...
Abstract The LCO Outbursting Objects Key (LOOK) Project uses the telescopes of Las Cumbres Observatory (LCO) Network to (1) systematically monitor a sample previously discovered over whole sky, assess evolutionary state these distant remnants from early solar system, and (2) use alerts existing sky surveys rapidly respond characterize detected outburst activity in all small bodies. data gathered on outbursts helps each outburst’s evolution with time, frequency magnitude distribution general,...
Abstract On 2020 April 29, the near-Earth object (52768) 1998 OR2 experienced a close approach to Earth at distance of 16.4 lunar distances (LD). is potentially hazardous asteroid absolute magnitude H = 16.04 that can currently come as 3.4 LD. We report here observations this in polarimetry, photometry, and radar. Our show physical characteristics are similar those both M- S-type asteroids. Arecibo’s radar provide high albedo <?CDATA ${\hat{\sigma }}_{\mathrm{OC}}\,=$?> <mml:math...
Abstract We report radar, photometric, and visible-wavelength spectrophotometry observations of NEA 2018 EB obtained in 2018. The radar campaign started at Goldstone (8560 MHz, 3.5 cm) on April 7, it was followed by more extensive from October 5 to 9 both Arecibo (2380 12.6 Goldstone. observed optically 5, 8, again 18. Spectrophotometry 19 with the SOAR telescope, data suggest that is an Xk-class object. echo power spectra delay-Doppler images revealed a binary system. Radar constrained...
At present, part of the forward RPC muon system CMS detector at CERN LHC remains uninstrumented in high-η region. An international collaboration is investigating possibility covering 1.6 < |η| 2.4 region endcaps with large-area triple-GEM detectors. Given their good spatial resolution, high rate capability, and radiation hardness, these micro-pattern gas detectors are an appealing option for simultaneously enhancing tracking triggering capabilities a future upgrade detector. A general...
Las Cumbres Observatory (LCO) has deployed a homogeneous telescope network of ten 1-m telescopes to four locations in the northern and southern hemispheres, with planned size twelve at 6 locations. This is very versatile designed respond rapidly target opportunity events also perform long term monitoring slowly changing astronomical phenomena. The global coverage, available apertures, flexibility LCO make it ideal for discovery, follow-up, characterization Solar System objects such as...
Cometary activity may be driven by ices with very low sublimation temperatures, such as carbon monoxide ice, which can sublimate at distances well beyond 20 au. This point is emphasized the discovery of Oort cloud comet C/2014 UN$_{271}$ (Bernardinelli-Bernstein), and its observed out to $\sim$26 Through observations this comet's optical brightness behavior, we potentially discern drivers in outer solar system. We present a study Bernardinelli-Bernstein broad-band photometry taken 19-20 au...
In view of a possible extension the forward CMS muon detector system and future LHC luminosity upgrades, Micro-Pattern Gas Detectors (MPGDs) are an appealing technology. They can simultaneously provide precision tracking fast trigger information, as well sufficiently fine segmentation to cope with high particle rates in high-eta region at its upgrades. We report on design construction full-size prototype for endcap system, largest Triple-GEM built to-date. present details 3D modeling...
The CMS GEM collaboration is considering Gas Electron Multipliers (GEMs) for upgrading the forward muon system in 1.5 <; |η| 2.4 endcap region. detectors can provide precision tracking and fast trigger information. They would improve momentum resolution missing redundancy high-η Employing a new faster construction assembly technique, we built four full-scale Triple-GEM inner ring of first station. We plan to install these or further improved versions during long LHC shutdown 2013/14...
Context. The close approach of the near-Earth asteroid (99942) Apophis to Earth in 2029 will provide a unique opportunity examine how physical properties could be changed due Earth's gravitational perturbation. As result, Republic Korea is planning rendezvous mission Apophis. Aims. Our aim was use photometric data from apparitions 2020-2021 refine shape model and spin state Methods. Using thirty-six 1 2-m class ground-based telescopes Transiting Exoplanet Survey Satellite, we performed...
GEM detectors are used in high energy physics experiments given their good spatial resolution, rate capability and radiation hardness. An international collaboration is investigating the possibility of covering 1.6 < |η| 2.4 region CMS muon endcaps with large-area triple-GEM detectors. The high-η area actually not fully instrumented, only Cathode Strip Chamber (CSC) installed. vacant presents an opportunity for a detector technology able to cope harsh environment; these micropattern gas...
The CMS GEM collaboration is considering Gas Electron Multipliers (GEMs) for upgrading the forward muon system in 1.5<|eta|<2.4 endcap region. detectors can provide precision tracking and fast trigger information. They would improve momentum resolution missing redundancy high-eta Employing a new faster construction assembly technique, we built four full-scale Triple-GEM inner ring of first station. We plan to install these or further improved versions during long LHC shutdown 2013/14...
On 4 March 2021 at 9 UTC a 30-m in diameter near-Earth asteroid DW1 passed the Earth distance of 570000 km, reaching maximum brightness V=14.6 mag. We observed it photometrically from 2 March, when was visible V=16.5 mag, until 7 (V=18.2 mag). During that time swept 170 degrees long arc northern sky, spanning solar phase angles range 36 to 86 degrees. This made an excellent target for physical characterisation, including spin axis and shape derivation. Convex inversion lightcurves gives...
Gas Electron Multipliers (GEM) are an interesting technology under consideration for the future upgrade of forward region CMS muon system, specifically in 1.6 <; |η| 2:4 endcap region. With a sufficiently fine segmentation GEMs can provide precision tracking as well fast trigger information. The main objective is to contribute improvement trigger. construction large-area GEM detectors challenging both from technological and production aspects. In view we have designed built largest full-size...