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Multi-spacecraft observations of the structure of the sheath of an interplanetary coronal mass ejection and related energetic ion enhancement
Vainio, R.; Kilpua, E. K. J.; Lavraud, B. +18 more
Context. Sheath regions ahead of coronal mass ejections (CMEs) are large-scale heliospheric structures that form gradually with CME expansion and propagation from the Sun. Turbulent and compressed sheaths could contribute to the acceleration of charged particles in the corona and in interplanetary space, but the relation of their internal structur…
A Kinematic Perspective on the Formation Process of the Stellar Groups in the Rosette Nebula
Lim, Beomdu; Lee, Jeong-Eun; Yun, Hyeong-Sik +6 more
Stellar kinematics is a powerful tool for understanding the formation process of stellar associations. Here, we present a kinematic study of the young stellar population in the Rosette nebula using recent Gaia data and high-resolution spectra. We first isolate member candidates using the published mid-infrared photometric data and the list of X-ra…
Dissecting the Gaia HR diagram within 200 pc
Girardi, Léo; Marigo, Paola; Chen, Yang +6 more
We analyse the high-quality Hertzsprung-Russell diagram (HRD) derived from Gaia data release 2 for the Solar Neighbourhood. We start building an almost complete sample within 200 pc and for |b| > 25○, so as to limit the impact of known errors and artefacts in the Gaia catalogue. Particular effort is then put into improving the modell…
What happened before?. Disks around the precursors of young Herbig Ae/Be stars
Waters, L. B. F. M.; Dominik, C.; Valegård, P. -G.
Context. Planets form in circumstellar disks around pre-main-sequence stars. A key question is, how do the formation and evolution of protoplanetary disks depend on stellar mass? Studies of circumstellar disks at infrared and submillimeter wavelengths around intermediate-mass Herbig Ae/Be stars have revealed disk structures such as cavities, gaps,…
The Impact of Stellar Clustering on the Observed Multiplicity and Orbital Periods of Planetary Systems
Kruijssen, J. M. Diederik; Longmore, Steven N.; Chevance, Mélanie
It has recently been shown that stellar clustering plays an important role in shaping the properties of planetary systems. We investigate how the multiplicity distributions and orbital periods of planetary systems depend on the 6D phase space density of stars surrounding planet host systems. We find that stars in high stellar phase space density e…
Physical and chemical structure of the Serpens filament: Fast formation and gravity-driven accretion
Menten, K. M.; Belloche, A.; Henkel, C. +5 more
Context. The Serpens filament, a prominent elongated structure in a relatively nearby molecular cloud, is believed to be at an early evolutionary stage, so studying its physical and chemical properties can shed light on filament formation and early evolution.
Aims: The main goal is to address the physical and chemical properties as well as th…
Predicting the Magnetic Fields of a Stealth CME Detected by Parker Solar Probe at 0.5 au
Al-Haddad, Nada; Lynch, Benjamin J.; Palmerio, Erika +5 more
Stealth coronal mass ejections (CMEs) are eruptions from the Sun that are not associated with appreciable low-coronal signatures. Because they often cannot be linked to a well-defined source region on the Sun, analysis of their initial magnetic configuration and eruption dynamics is particularly problematic. In this article, we address this issue …
ExoMars TGO/NOMAD-UVIS Vertical Profiles of Ozone: 1. Seasonal Variation and Comparison to Water
Aoki, S.; Vandaele, A. C.; Daerden, F. +23 more
We present ∼1.5 Mars Years (MY) of ozone vertical profiles, covering LS = 163° in MY34 to LS = 320° in MY35, a period which includes the 2018 global dust storm. Since April 2018, the Ultraviolet and Visible Spectrometer channel of the Nadir and Occultation for Mars Discovery (NOMAD) instrument aboard the ExoMars Trace Gas Orb…
3D core kinematics of NGC 6362: central rotation in a dynamically evolved globular cluster
Vesperini, Enrico; Dalessandro, Emanuele; Kamann, Sebastian +4 more
We present a detailed 3D kinematic analysis of the central regions (R < 30 arcsec) of the low mass and dynamically evolved galactic globular cluster (GC) NGC 6362. The study is based on data obtained with ESO-VLT/MUSE used in combination with the adaptive optics module and providing ~3000 line-of-sight radial velocities, which have been complem…
Evolution of Interplanetary Coronal Mass Ejection Complexity: A Numerical Study through a Swarm of Simulated Spacecraft
Poedts, Stefaan; Lugaz, Noé; Scolini, Camilla +1 more
In-situ measurements carried out by spacecraft in radial alignment are critical to advance our knowledge on the evolutionary behavior of coronal mass ejections (CMEs) and their magnetic structures during propagation through interplanetary space. Yet, the scarcity of radially aligned CME crossings restricts investigations on the evolution of CME ma…