Search Publications
Importance of radiative pumping for the excitation of the H2O submillimeter lines in galaxies
González-Alfonso, Eduardo; Pereira-Santaella, Miguel; Yang, Chentao +3 more
H2O submillimeter emission is a powerful diagnostic of the molecular interstellar medium in a variety of sources, including low- and high-mass star-forming regions of the Milky Way, and from local to high-redshift galaxies. However, the excitation mechanism of these lines in galaxies has been debated, preventing a basic consensus on the…
Chromospheric emission from nanoflare heating in RADYN simulations
De Pontieu, B.; Rouppe van der Voort, L.; Carlsson, M. +4 more
Context. Heating signatures from small-scale magnetic reconnection events in the solar atmosphere have proven to be difficult to detect through observations. Numerical models that reproduce flaring conditions are essential in understanding how nanoflares may act as a heating mechanism of the corona.
Aims: We study the effects of non-thermal e…
Numerical and experimental evidence for a new interpretation of residence times in space
Heber, B.; Herbst, K.; Engelbrecht, N. Eugene +2 more
Aims: We investigate the energy dependence of Jovian electron residence times, which allows for a deeper understanding of adiabatic energy changes that occur during charged particle transport, as well as of their significance for simulation approaches. Thereby we seek to further validate an improved approach to estimate residence times numeri…
The CH4 abundance in Jupiter's upper atmosphere
Sánchez-López, A.; Snellen, I. A. G.; López-Puertas, M. +3 more
Hydrocarbon species, and in particular CH4, play a key role in the stratosphere-thermosphere boundary of Jupiter, which occurs around the µ-bar pressure level. Previous analyses of solar occultation, He and Ly-α airglow, and ISO/SWS measurements of the radiance around 3.3 µm have inferred significantly different methane conc…
CORALIE radial-velocity search for companions around evolved stars (CASCADES). I. Sample definition and first results: Three new planets orbiting giant stars
Buldgen, G.; Eggenberger, P.; Ségransan, D. +11 more
Context. Following the first discovery of a planet orbiting a giant star in 2002, we started the CORALIE radial-velocity search for companions around evolved stars. We present the observations of three stars conducted at the 1.2 m Leonard Euler Swiss telescope at La Silla Observatory, Chile, using the CORALIE spectrograph.
Aims: We aim to det…
A giant planet shaping the disk around the very low-mass star CIDA 1
Lodato, G.; Testi, L.; Lombardi, M. +13 more
Context. Exoplanetary research has provided us with exciting discoveries of planets around very low-mass (VLM) stars (0.08 M⊙ ≲ M* ≲ 0.3 M⊙; e.g., TRAPPIST-1 and Proxima Centauri). However, current theoretical models still strive to explain planet formation in these conditions and do not predict the development of …
The VMC survey. XLV. Proper motion of the outer LMC and the impact of the SMC
de Grijs, Richard; Ripepi, Vincenzo; Cioni, Maria-Rosa L. +8 more
Context. The Large Magellanic Cloud (LMC) is the most luminous satellite galaxy of the Milky Way and, owing to its companion, the Small Magellanic Cloud (SMC), represents an excellent laboratory to study the interaction of dwarf galaxies.
Aims: The aim of this study is to investigate the kinematics of the outer regions of the LMC by using ste…
VLT spectropolarimetry of comet 67P: dust environment around the end of its intense southern summer
Kolokolova, Ludmilla; Agarwal, Jessica; Snodgrass, Colin +5 more
Context. A cornucopia of Rosetta and ground-based observational data sheds light on the evolution of the characteristics of dust particles from comet 67P/Churyumov-Gerasimenko (hereafter 67P) with seasons, implying the different dust environments in the source regions on the surface of the comet.
Aims: We aim to constrain the properties of th…
Near-infrared observations of RR Lyrae and Type II Cepheid variables in the metal-rich bulge globular cluster NGC 6441
Rejkuba, M.; Ripepi, V.; Marconi, M. +4 more
Context. NGC 6441 is a bulge globular cluster (GC) with an unusual horizontal branch morphology and a rich population of RR Lyrae (RRL) and Type II Cepheid (T2C) variables that is unexpected for its relatively high metallicity.
Aims: Our goal is to characterize the pulsation properties of the population II RRL and T2C variables in this metal-…
A multi-planetary system orbiting the early-M dwarf TOI-1238
Nagel, E.; Amado, P. J.; Caballero, J. A. +53 more
Context. The number of super-Earth and Earth-mass planet discoveries has increased significantly in the last two decades thanks to the Doppler radial velocity and planetary transit observing techniques. Either technique can detect planet candidates on its own, but the power of a combined photometric and spectroscopic analysis is unique for an insi…