A5025987647- Astro and Planetary Science
- Planetary Science and Exploration
- Stellar, planetary, and galactic studies
- Earthquake Detection and Analysis
- Astrophysics and Star Formation Studies
- Astrophysical Phenomena and Observations
- Seismic Waves and Analysis
- Gamma-ray bursts and supernovae
- Seismology and Earthquake Studies
- Geology and Paleoclimatology Research
- Spacecraft Design and Technology
- Adaptive optics and wavefront sensing
- Ionosphere and magnetosphere dynamics
- Atmospheric Ozone and Climate
- Isotope Analysis in Ecology
- IoT-based Smart Home Systems
- Astronomical Observations and Instrumentation
- Ocular and Laser Science Research
- Nuclear Physics and Applications
- earthquake and tectonic studies
- Pulsars and Gravitational Waves Research
- Network Security and Intrusion Detection
- Engineering Education and Curriculum Development
- Fire Detection and Safety Systems
- Infrared Target Detection Methodologies
Max Planck Institute for Extraterrestrial Physics
2024
Carl von Ossietzky Universität Oldenburg
2016-2023
The ionisation cones of NGC 5728 have a deficit molecular gas based on millimetre observations CO (2-1) emission. Although photoionisation from the active nucleus may lead to suppression this transition, warm can still be present. We report detection eight mid-infrared rotational H 2 lines throughout central kiloparsec, including cones, using integral field spectroscopic with JWST/MIRI MRS. line ratios, characteristic power-law temperature distribution, indicate that is warmest where it...
The study of dust, the most abundant material in cometary nuclei, is pivotal understanding original materials forming Solar system. Measuring coma phase function provides a tool to investigate nature dust. Rosetta/OSIRIS sampled comet 67P/Churyumov–Gerasimenko, covering large angle range small amount time. Twelve series were acquired period from 2015 March 2016 February for this scientific purpose. These data allowed, after stray light removal, measuring shape, its reddening, and reddening...
The OSIRIS (optical, spectroscopic and infrared remote imaging system) instrument on board the ESA Rosetta spacecraft collected data of 67P/Churyumov–Gerasimenko for over 2 yr. consists two cameras, a Narrow Angle Camera Wide Camera. For specific sequences related to observation dust aggregates in 67P's coma, cameras were operating simultaneously. are mounted 0.7 m apart from each other, as result this baseline yields parallax shift apparent particle trails analysed images directly...
Large meteoroids can be registered in infrasound recordings during their entry into the Earth’s atmosphere. A comprehensive study of 10 large fireball events years 2018 and 2019 highlights detection characterization using global arrays International Monitoring System (IMS) Comprehensive Nuclear-Test-Ban Treaty (CTBT). The focuses on observation event analysis fireballs to estimate respective location, yield, trajectory, behavior. Signal characteristics are derived by applying Progressive...
Aims: We aim at spatially and spectrally resolving the innermost scale of young stellar object CI Tau to constrain inner disk properties better understand magnetospheric accretion phenomenon. Methods: The high sensitivity offered by combination four 8-m telescopes VLTI allied with spectral resolution K-band beam combiner GRAVITY offers a unique capability probe sub-au system, tracing both dust gas emission regions. develop geometrical model fit interferometric observables physical dusty...
Cometary outbursts on several comets have been observed both by ground-based telescopes and in situ instruments spacecraft. However, the mechanism behind these phenomena their physical properties are still unclear. The optical, spectrocopic infrared remote imaging system (OSIRIS) onboard Rosetta spacecraft provided first-hand information from comet 67P/Churyumov–Gerasimenko during its perihelion passage 2015. of can be investigated examining time series high-resolution images. An analysis is...
In meteor physics the luminous efficiency ${\tau}$ is used to convert meteor's magnitude corresponding meteoroid's mass. However, lack of sufficiently accurate verification methods or adequate laboratory tests leave this parameter be controversially discussed. work meteor/fireball data obtained by Fireball Recovery and InterPlanetary Observation Network (FRIPON) was calculate masses pre-atmospheric meteoroids which could in turn compared brightnesses assess their efficiencies. For that,...
Context: Until recently, camera networks designed for monitoring fireballs worldwide were not fully automated, implying that in case of a meteorite fall, the recovery campaign was rarely immediate. This an important limiting factor as most fragile - hence precious meteorites must be recovered rapidly to avoid their alteration. Aims: The Fireball Recovery and InterPlanetary Observation Network (FRIPON) scientific project overcome this limitation. network comprises automated radio deployed...
We present a photometric analysis of individual dust grains in the coma comet 67P/Churyumov–Gerasimenko using OSIRIS images taken from 2015 July to 2016 January. analysed sample 555 during 18 d at heliocentric distances ranging between 1.25 and 2.04 au nucleocentric 80 437 km. An automated method detect tracks was specifically developed. The were by NAC four different filters: Near-IR (882 nm), Orange (649 FarOrange nm) Blue (480 nm). It not always possible recognize all filters, hence we...
In a Rosetta/OSIRIS imaging activity in 2015 June, we have observed the dynamic motion of particles close to spacecraft. Due focal setting OSIRIS wide angle camera, these were blurred, which can be used measure their distances We detected 109 dust aggregates over 130 min long sequence, and find that sizes are around millimetre cluster between 2 40 m from Their number densities about factor 10 higher than expected for overall coma highly fluctuating. velocities small compared spacecraft...
Context. Fireballs are particularly bright meteors produced by large meteoroids or small asteroids that enter the Earth’s atmosphere. These objects, of sizes from some tens centimetres to a few metres, difficult record with typical meteor detection methods. Therefore, their characteristics and fluxes still not well known. Infrasound signals can travel through atmosphere over distances. Impacting produce those signals, as space-detectable optical signatures. Aims. This paper aims study...
Context. The luminous efficiency, τ , can be used to compute the pre-atmospheric masses of meteoroids from corresponding recorded meteor brightnesses. derivation efficiency is non-trivial and subject biases model assumptions. This has led greatly varying results in last decades studies. Aims. present paper aims investigate how a reduction various observational achieved derive (more) reliable values for efficiency. Methods. A total 281 meteors observed by Fireball Recovery InterPlanetary...
<p>Large meteoroids can be registered in infrasound recordings during their entry into the Earth’s atmosphere. A comprehensive study of 10 large fireball events years 2018 and 2019 highlights detection characterization using global arrays International Monitoring System (IMS) Comprehensive Nuclear-Test-Ban Treaty (CTBT). The focuses on observation event analysis fireballs to estimate respective location, yield, trajectory, behavior. Signal characteristics are...