Search Publications
The impact of the presence of water ice on the analysis of debris disk observations
Wolf, S.; Stuber, T. A.
Context. The analysis of debris disk observations is often based on the assumption of a dust phase composed of compact spherical grains consisting of astronomical silicate. Instead, observations indicate the existence of water ice in debris disks.
Aims: We quantify the impact of water ice as a potential grain constituent in debris disks on th…
Evidence for thermokarst depressions on comet 67P/Churyumov-Gerasimenko: An interplanetary comparison
Jorda, L.; Groussin, O.; Bouley, S. +3 more
Aims: The nucleus of comet 67P/Churyumov-Gerasimenko (67P) is ice rich and shows evidence of morphologies driven by sublimation processes. In particular, the fine-particle deposits (FPD) that cover its surface reveal depressions of many tens of meters. A detailed analysis of these morphologies and of the properties of the fine-particle deposi…
Constraining X-ray emission of a magnetically arrested disk by radio-loud AGNs with an extreme-ultraviolet deficit
Li, Shuang-Liang; Gu, Minfeng; Zhou, Minhua
Aims: Active galactic nuclei (AGNs) with an extreme-ultraviolet (EUV) deficit are suggested to be powered by a magnetically arrested disk (MAD) surrounding the black hole, where the slope of EUV spectra (αEUV) is found to possess a clearly positive relationship with the jet efficiency. In this work, we investigate the properties of…
Stellar Population Astrophysics (SPA) with the TNG. α-elements, lithium, sodium and aluminum in 16 open clusters
Vallenari, A.; Bragaglia, A.; Spina, L. +13 more
Context. Exploring the Galactic chemical evolution and enrichment scenarios with open clusters (OCs) allows us to understand the history of the Milky Way disk. High-resolution spectra of OCs are a crucial tool, as they provide precise chemical information, to combine with precise distances and ages.
Aims: The aim of the Stellar Population Ast…
Refractory elements in the gas phase for comet 67P/Churyumov-Gerasimenko. Possible release of atomic Na, Si, and Fe from nanograins
De Keyser, Johan; Gombosi, Tamas I.; Berthelier, Jean-Jacques +10 more
Context. Gas-phase sodium, silicon, potassium, and calcium were previously identified in mass spectra recorded in the coma of comet 67P/Churyumov-Gerasimenko, the target of the European Space Agency's Rosetta mission. The major release process for these atoms was identified as sputtering by the solar wind. More recently, remote observations of num…
J1832.4-1627, the first eclipsing stream-fed intermediate polar
Beuermann, K.; Breitenstein, P.; Schwab, E.
We present a photometric study of the newly discovered eclipsing intermediate polar
Spherical harmonic decomposition and interpretation of the shapes of the small Saturnian inner moons
Lainey, V.; Rambaux, N.; Cooper, N. +2 more
Context. The Cassini-Huygens space mission made a series of observations of Saturn's small satellites during its grand finale stage. These measurements were performed in order to study the shape, geology, and surface composition of the small satellites as well as to study the impact of the environment, in particular the rings, on these small bodie…
SRG/ART-XC, Swift, NICER, and NuSTAR study of different states of the transient X-ray pulsar MAXI J0903-531
Wilms, Jörn; Doroshenko, Victor; Tsygankov, Sergey S. +6 more
The results of the broadband spectral and timing study of the recently discovered transient X-ray pulsar MAXI J0903-531 in a wide range of luminosities that differ by a factor of ~30 are reported. The observed X-ray spectrum in both states can be described as a classical pulsar-like spectrum consisting of a power law with a high-energy cutoff. We …
Tracking of magnetic helicity evolution in the inner heliosphere. A radial alignment study
Richter, I.; Narita, Y.; Hadid, L. Z. +5 more
Context. Magnetic helicity is one of the invariants in ideal magnetohydrodynamics, and its spectral evolution has a substantial amount of information to reveal the mechanism that are behind turbulence in space and astrophysical plasmas.
Aims: The goal of our study is to observationally characterize the magnetic helicity evolution in the inner…
Disentangling emission from star-forming regions in the Magellanic Clouds: Linking [O III]λ88 µm and 24 µm
Ramambason, L.; Lebouteiller, V.; Madden, S. C. +5 more
Context. The [O III]λ88 µm line is observed in many galaxies including our neighboring Magellanic Clouds and is a well-known tracer of H II regions, while the 24 µm continuum emission has often been used to trace warm dust in the ionized phases of galaxies. The association of both the [O III]λ88 µm line and 24 µm in galaxies to star formation moti…