A5004034488- Astro and Planetary Science
- Planetary Science and Exploration
- Isotope Analysis in Ecology
- Nuclear Physics and Applications
- Stellar, planetary, and galactic studies
- Atmospheric Ozone and Climate
- Astrophysics and Star Formation Studies
- Space Exploration and Technology
- Mass Spectrometry Techniques and Applications
- Spacecraft and Cryogenic Technologies
- Molecular Spectroscopy and Structure
- Pulsars and Gravitational Waves Research
- Laser-induced spectroscopy and plasma
- Cosmology and Gravitation Theories
- Galaxies: Formation, Evolution, Phenomena
- Scientific Measurement and Uncertainty Evaluation
University of Bern
2020-2023
International Space Science Institute
2021-2023
University of Zurich
2020
Ammonium hydrosulphide has long since been postulated to exist at least in certain layers of the giant planets. Its radiation products may be reason for red colour seen on Jupiter. Several ammonium salts, NH3 and an acid, have previously detected comet 67P/Churyumov-Gerasimenko. The acid H2S is fifth most abundant molecule coma 67P followed by NH3. In order look salt NH4+SH-, we analysed situ measurements from Rosetta/ROSINA Double Focusing Mass Spectrometer during Rosetta mission. appear...
Context. Isotopic abundances in comets are key to understanding and reconstructing the history origin of material Solar System. Data for deuterium-to-hydrogen (D/H) ratios water available several comets. However, no long-term studies D/H ratio a comet during its passage around Sun have been reported thus far. Linear alkanes important organic molecules that found on System bodies, including To date, processes their deuteration still poorly understood, only upper limits isotopic 13 C/ 12 C...
Although the debate regarding origin of cyano (CN) radical in comets has been ongoing for many decades, it yielded no definitive answer to date. CN could previously only be studied remotely, strongly hampering efforts constrain its because very limited spatial information. Thanks European Space Agency's Rosetta spacecraft, which orbited comet 67P/Churyumov-Gerasimenko two years, we can investigate, first time, around a at high and temporal resolution. On board Rosetta's orbiter module,...
The cyano radical (CN) is one of the most frequently remotely observed species in space, also comets. Data from high-resolution Double Focusing Mass Spectrometer (DFMS) on board Rosetta orbiter, collected inner coma comet 67P/Churyumov-Gerasimenko, revealed an unexpected chemical complexity, and, recently, more CN than expected photodissociation its likely parent hydrogen cyanide (HCN). This work dedicated to derivation abundances relative HCN three cometary nitriles (including structural...
ABSTRACT We characterized the 67P/Churyumov–Gerasimenko’s dust activity, by analysing individual particle velocity and momentum measurements of Grain Impact Analyser Dust Accumulator (GIADA), detector onboard ESA/Rosetta spacecraft, collecting from tens to hundreds kilometres nucleus. Specifically, we developed a procedure trace back motion particles down nucleus, identifying surface’s region ejecting each particle. This has been validated for first part mission Longobardo et al. was...
Obtaining a better understanding of intermediate-mass black holes (IMBHs) is crucial, as their properties could shed light on the origin and growth supermassive counterparts. Massive star-forming clumps, which are present in large fraction massive galaxies at $z \sim$ 1-3, amongst venues wherein IMBHs reside. We perform series Fokker-Planck simulations to explore occurrence tidal disruption (TD) gravitational wave (GW) events about an IMBH clump, modelling latter so that its mass ($10^8...
The ESA Rosetta mission has allowed an extensive in-situ study of comet 67P/Churyumov-Gerasimenko. In measurements performed by the ram gauge on-board COmet Pressure Sensor (COPS), features have been observed that deviate from nominal signal. These are attributable to sublimation volatile fraction cometary icy particles containing volatiles and refractories. objective this work is investigation content entered COPS gauge. inspected for we associate component impacting instrument. All with...
In an earlier study, we reported that the ram gauge of COmet Pressure Sensor (COPS), one three instruments Rosetta Orbiter Spectrometer for Ion and Neutral Analysis (ROSINA), could be used to obtain information about sublimating content icy particles, made up volatiles conceivably refractories coming from comet 67P/Churyumov-Gerasimenko. this work, extend investigation second COPS gauge, nude gauge. particular, analyse volume volatile coma along with a search possible dependencies between...
The European Space Agency's Rosetta mission to comet 67P/Churyumov-Gerasimenko has offered scientists the opportunity study a in unprecedented detail. Four instruments of orbiter, namely, Micro-Imaging Dust Analysis System (MIDAS), Grain Impact Analyzer and Accumulator (GIADA), COmetary Secondary Ion Mass Analyser (COSIMA), Orbiter Spectrometer for Neutral (ROSINA) have provided information on cometary dust particles. Cross-instrument comparisons are crucial characterize particles beyond...
The ESA/Rosetta mission accompanied the Jupiter Family Comet 67P/Churyumov-Gerasimenko and provided a huge amount of data which are providing important results about cometary activity mechanisms. We summarize obtained within ISSI International Team Characterization 67P activity, studied dust gas ejection in different stages comet’s orbit, by means fusion between instruments onboard Rosetta orbiter, i.e., OSIRIS camera, VIRTIS imaging spectrometer, GIADA detector, MIDAS atomic force...
Results. We found that gas-phase silicon was present throughout the Rosetta mission. Furthermore, presence of sodium and iron atoms near comet's perihelion confirms sputtering cannot be sole release process for refractory elements into gas phase. Nickel to below detection limit. The search parent species any identified phase refractories has not been successful. Upper limits a suite possible fragment (SiH, SiC, NaH, etc.) larger daughter have obtained. Si did exhibit same drop in signal as...
For a long time it was thought that the cyano (CN) radical, observed remotely many times in various stellar and interstellar environments, is exclusively photodissociation product of hydrogen cyanide (HCN). Bockelée-Morvan et al. (1984) first questioned this notion based on remote observations comet IRAS-Araki-Alcock. They reported an upper limit for HCN production rate which smaller than CN previously derived by A’Hearn (1983). Even today, discrepancy some comets not...
AbstractThe coma of active comets contains two essential components resulting from cometary activity: gas and dust. To investigate the latter, Rosetta spacecraft was equipped with several instruments fully dedicated to analysis dust in comet 67P/Churyumov-Gerasimenko (67P). We show that, although not designed observe dust, another instrument onboard can obtain information about particles 67P: ROSINA-COPS ram gauge (RG, [1]) shown Figure 1. In particular, it possible measure...
<p>The Rosetta mission of the European Space Agency has enabled a deep study nucleus and coma comet 67P/Churyumov-Gerasimenko (hereafter 67P). Four instruments onboard spacecraft sensed particles ejected from 67P: Grain Impact Analyzer Dust Accumulator (GIADA; Della Corte et al. 2014), COmetary Secondary Ion Mass Analyser (COSIMA; Kissel 2007), Micro-Imaging Analysis System (MIDAS; Riedler COmet Pressure Sensor (COPS; Balsiger 2007). GIADA, COSIMA, MIDAS were developed...
<p>Vincent et al. (2016) studied a 3-month period surrounding comet 67P’s perihelion passage in August 2015. They detected and characterized 34 different dust outbursts with the Rosetta cameras. The sudden brief release of such transient events is by short lifetime. In their study, Vincent estimated source location observed outbursts. were almost entirely on Southern hemisphere mostly located close to morphological boundaries 67P. Thus, link between morphology...
<p><strong>Introduction</strong></p> <p>The ESA Rosetta mission orbited the 67P/Churyumov-Gerasimenko comet (hereafter 67P) for two years and its results are providing important clues to understand activity processes on comets.</p> goal of ISSI International Team “Characterization 67P cometary activity” is two-fold:</p> <ul> <li>Retrieval...
<p>While the volatile species in comet 67P/Churyumov-Gerasimenko’s coma have been analyzed great spatial and temporal detail, e.g., Rubin et al. (2019) or Läuter (2020), little is so far known about less volatile, heavier species. There growing evidence, however, that species, such as salts, may play a key role explaining some of puzzling properties comets, for instance shown by Altwegg (2020). These authors also demonstrated unique capability...
Rosetta was a mission developed by the European Space Agency aimed at prolonged study of remnant Solar System formation: Jupiter-family comet 67P/Churyumov-Gerasimenko (hereafter, 67P). After ten years travel, on 6 August 2014 spacecraft arrived its target and an observation campaign almost two started.The equipped with various instruments designed to analyze cometary dust in 67P's coma, such as Micro-Imaging Dust Analysis (MIDAS; Riedler et al. 2007), Grain Impact Analyzer Accumulator...
Small and volatile molecules are the most abundant constituents of a comet’s neutral coma. Thanks to ESA’s Rosetta mission, coma comet 67P/Churyumov-Gerasimenko (67P hereafter) has been analyzed in great spatial temporal detail, e.g., by Rubin et al. (2019) or Läuter (2020). However, Double Focusing Mass Spectrometer (DFMS) – part Orbiter for Ion Neutral Analysis (ROSINA; Balsiger 2007) delivered data which contains information about transition region...