Search Publications
Mars moon ephemerides after 14 years of Mars Express data
Jaumann, R.; Oberst, J.; Rosenblatt, P. +7 more
The Mars Express (MEX) mission has been successfully operated around Mars since 2004. Among many results, MEX has provided some of the most accurate astrometric data of the two Mars moons, Phobos and Deimos. We present new ephemerides of the Mars moons benefitting from all previously published astrometric data to the most recent MEX SRC data. Obse…
Quantitative inference of the H2 column densities from 3 mm molecular emission: case study towards Orion B
Peretto, Nicolas; Hughes, Annie; Kainulainen, Jouni +21 more
Context. Based on the finding that molecular hydrogen is unobservable in cold molecular clouds, the column density measurements of molecular gas currently rely either on dust emission observation in the far-infrared, which requires space telescopes, or on star counting, which is limited in angular resolution by the stellar density. The (sub)millim…
Comparative high-resolution spectroscopy of M dwarfs: Exploring non-LTE effects
Heiter, U.; Kochukhov, O.; Olander, T.
Context. M dwarfs are key targets for high-resolution spectroscopy and model atmosphere analyses because of the high incidence of these stars in the solar neighbourhood and their importance as exoplanetary hosts. Several methodological challenges make such analyses difficult, leading to significant discrepancies in the published results.
Aims…
Black hole feeding and star formation in NGC 1808
Krips, M.; van der Werf, P.; Combes, F. +11 more
We report on Atacama Large Millimeter Array (ALMA) observations of CO(3−2) emission in the Seyfert2/starburst galaxy NGC 1808, at a spatial resolution of 4 pc. Our aim is to investigate the morphology and dynamics of the gas inside the central 0.5 kpc and to probe the nuclear feeding and feedback phenomena. We discovered a nuclear spiral of radius…
Cyanogen, cyanoacetylene, and acetonitrile in comet 67P and their relation to the cyano radical
Altwegg, K.; Balsiger, H.; Fuselier, S. A. +6 more
The cyano radical (CN) is one of the most frequently remotely observed species in space, and is also often observed in comets. Data for the inner coma of comet 67P/Churyumov-Gerasimenko collected by the high-resolution Double Focusing Mass Spectrometer (DFMS) on board the Rosetta orbiter revealed an unexpected chemical complexity, and, recently, a…
External gas accretion provides a fresh gas supply to the active S0 galaxy NGC 5077
Raimundo, S. I.
In early-type galaxies, externally accreted gas is thought to be the main source of gas replenishment at late times. We use MUSE integral field spectroscopy data to study the active S0 galaxy NGC 5077, which is known to have disturbed dynamics that are indicative of a past external interaction. We confirm the presence of a stellar kinematically di…
Rossby numbers and stiffness values inferred from gravity-mode asteroseismology of rotating F- and B-type dwarfs. Consequences for mixing, transport, magnetism, and convective penetration
Aerts, C.; Mathis, S.; Van Reeth, T. +5 more
Context. Multi-dimensional (magneto-)hydrodynamical simulations of physical processes in stellar interiors depend on a multitude of uncalibrated free parameters, which set the spatial and time scales of their computations.
Aims: We aim to provide an asteroseismic calibration of the wave and convective Rossby numbers, and of the stiffness at t…
Diagnosing the interstellar medium of galaxies with far-infrared emission lines. I. The [C II] 158 µm line at z ∼ 0
Wang, L.; van der Tak, F. F. S.; Trager, S. C. +2 more
Context. Atomic fine structure lines have been detected in the local Universe and at high redshifts over the past decades. The [C II] emission line at 158 µm is an important observable as it provides constraints on the interstellar medium (ISM) cooling processes.
Aims: We develop a physically motivated framework to simulate the producti…
The active region source of a type III radio storm observed by Parker Solar Probe during encounter 2
Barczynski, K.; Mandrini, C. H.; Bale, S. D. +6 more
Context. We investigated the source of a type III radio burst storm during encounter 2 of NASA's Parker Solar Probe (PSP) mission.
Aims: It was observed that in encounter 2 of NASA's PSP mission there was a large amount of radio activity and, in particular, a noise storm of frequent, small type III bursts from 31 March to 6 April 2019. Our ai…
A kinematic study of central compact objects and their host supernova remnants
Becker, Werner; Mayer, Martin G. F.
Context. Central compact objects (CCOs) are a peculiar class of neutron stars, primarily encountered close to the center of young supernova remnants (SNRs) and characterized by thermal X-ray emission. Measurements of their proper motion and the expansion of the parent SNR are powerful tools for constraining explosion kinematics and the age of the …