MARSCHALL , Raphael

A numerical model of cometary dust environments is used to gain a deeper understanding of the relationship between the brightness (Afρ) and the dust particle size distribution in the coma. Specifically, the spectral ratio of Afρ(425 nm)/Afρ(900 nm) is modelled for a wide range of parameters and tied to the power-law index. The studied...

Context. One of the primary goals of the European Space Agency's Rosetta mission to comet 67P/Churyumov-Gerasimenko was to investigate the mechanisms responsible for cometary activity. Aims: Our aim is to learn more about the ejection process of large refractory material by studying the dynamics of decimeter-sized dust particles in the coma of...

The units of the attitude perturbations in Figure 4 and 5 should be radians instead of degrees. The scaling law exponent of the dust production rate listed in Table 4 should be 0.92 instead of 0.82. The conclusions of the original article remain unchanged.

Large portions of comet 67P/Churyumov-Gerasimenko's northern hemisphere are blanketed by fallback material consisting of centimeter-sized particles termed the smooth terrains. Observations from the Rosetta mission show that the most drastic transient changes during 67P's 2015 perihelion passage occurred within a subset of these deposits....

Context. The formation and evolution of protoplanetary disks remains elusive. We have numerous astronomical observations of young stellar objects of different ages with their envelopes and/or disks. Moreover, in the last decade, there has been tremendous progress in numerical simulations of star and disk formation. New simulations use realistic...

Context. An assessment of the dust environment of a comet is needed for data analysis and planning spacecraft missions, such as ESA's Comet Interceptor (CI) mission. The distinctive feature of CI is that the target object will be defined shortly before (or even after) launch; as a result, the properties of the nucleus and dust environment are...

Assessment of the dust environment of a comet is needed for data analysis and planning of spacecraft missions, such as ESA's Comet Interceptor (CI) mission. The distinctive feature of CI is that the target object will be defined shortly before (or even after) launch therefore the properties of the nucleus and dust environment are poorly...