Search Publications
Exploring the innermost dust formation region of the oxygen-rich AGB star IK Tauri with VLT/SPHERE-ZIMPOL and VLTI/AMBER
Ohnaka, K.; Adam, C.
Context. Low- and intermediate-mass stars on the asymptotic giant branch (AGB) are known to be prevalent dust providers to galaxies, replenishing the surrounding medium with molecules and dust grains. However, the mechanisms responsible for the formation and acceleration of dust in the cool extended atmospheres of AGB stars are still open to debat…
Detection and Doppler monitoring of K2-285 (EPIC 246471491), a system of four transiting planets smaller than Neptune
Kuzuhara, M.; Alonso, R.; Deeg, H. +43 more
Context. The Kepler extended mission, also known as K2, has provided the community with a wealth of planetary candidates that orbit stars typically much brighter than the targets of the original mission. These planet candidates are suitable for further spectroscopic follow-up and precise mass determinations, leading ultimately to the construction …
Fragmentation and filaments at the onset of star and cluster formation. SABOCA 350 µm view of ATLASGAL-selected massive clumps
Menten, K. M.; Weiss, A.; Csengeri, T. +4 more
Context. The structure formation of the dense interstellar material and the fragmentation of clumps into cores is a fundamental step for understanding how stars and stellar clusters form.
Aims: We aim to establish a statistical view of clump fragmentation at subparsec scales based on a large sample of massive clumps selected from the ATLASGAL…
The OTELO survey. I. Description, data reduction, and multi-wavelength catalogue
Bland-Hawthorn, Joss; Cabrera-Lavers, Antonio; Gallego, Jesús +21 more
Context. The evolution of galaxies through cosmic time is studied observationally by means of extragalactic surveys. The usefulness of these surveys is greatly improved by increasing the cosmological volume, in either depth or area, and by observing the same targets in different wavelength ranges. A multi-wavelength approach using different observ…
Compressive strength of comet 67P/Churyumov-Gerasimenko derived from Philae surface contacts
Sierks, H.; Blum, J.; Güttler, C. +8 more
Context. The landing and rebound of the Philae lander, which was part of the ESA Rosetta mission, enabled us to study the mechanical properties of the surface of comet 67P/Churyumov-Gerasimenko, because we could use Philae as an impact probe.
Aims: The aim is to approximate the descent and rebound trajectory of the Philae lander and use this …
Observational evidence of third dredge-up occurrence in S-type stars with initial masses around 1 M⊙
Jorissen, A.; Van Winckel, H.; Van Eck, S. +3 more
Context. S stars are late-type giants with spectra showing characteristic molecular bands of ZrO in addition to the TiO bands typical of M stars. Their overabundance pattern shows the signature of s-process nucleosynthesis. Intrinsic, technetium (Tc)-rich S stars are the first objects on the asymptotic giant branch (AGB) to undergo third dredge-up…
Lack of high-mass pre-stellar cores in the starless MDCs of NGC 6334
Zavagno, A.; Louvet, F.; Russeil, D. +6 more
Context. The formation of high-mass stars remains unknown in many aspects. There are two competing families of models to explain the formation of high-mass stars. On the one hand, quasi-static models predict the existence of high-mass pre-stellar cores sustained by a high degree of turbulence. On the other hand, competitive accretion models predic…
Single metal-poor ultra compact dwarf galaxy at one kiloparsec distance from the low-mass elliptical galaxy FCC 47
Fahrion, Katja; Alfaro-Cuello, Mayte; van de Ven, Glenn +7 more
Context. Photometric surveys of galaxy clusters have revealed a large number of ultra compact dwarfs (UCDs) around predominantly massive elliptical galaxies. Their origin is still debated as some UCDs are considered to be the remnant nuclei of stripped dwarf galaxies while others seem to mark the high-mass end of the star cluster population.
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Modelling of Mg II lines in solar prominences
Labrosse, N.; Levens, P. J.
Context. Observations of the Mg II h and k lines in solar prominences with IRIS reveal a wide range of line shapes from simple non-reversed profiles to typical double-peaked reversed profiles, and with many other possible complex line shapes. The physical conditions responsible for this variety are not well understood.
Aims: Our aim is to und…
Hot exozodiacal dust: an exocometary origin?
Augereau, J. -C.; Sezestre, É.; Thébault, P.
Context. Near- and mid-infrared interferometric observations have revealed populations of hot and warm dust grains populating the inner regions of extrasolar planetary systems. These are known as exozodiacal dust clouds, or exozodis, reflecting the similarity with the solar system's zodiacal cloud. Radiative transfer models have constrained the du…