Search Publications
Solar system science with ESA Euclid
Carry, B.
Context. The ESA Euclid mission has been designed to map the geometry of the dark Universe. Scheduled for launch in 2020, it will conduct a six-year visible and near-infrared imaging and spectroscopic survey over 15 000 deg2 down to VAB ~ 24.5. Although the survey will avoid ecliptic latitudes below 15°, the survey pattern in…
Persistent magnetic vortex flow at a supergranular vertex
Bellot Rubio, Luis R.; Gošić, Milan; Requerey, Iker S. +1 more
Context. Photospheric vortex flows are thought to play a key role in the evolution of magnetic fields. Recent studies show that these swirling motions are ubiquitous in the solar surface convection and occur in a wide range of temporal and spatial scales. Their interplay with magnetic fields is poorly characterized, however.
Aims: We study th…
New giant radio sources and underluminous radio halos in two galaxy clusters
Brunetti, G.; Kale, R.; Venturi, T. +5 more
Aims: The aim of this work is to analyse the radio properties of the massive and dynamically disturbed clusters Abell 1451 and Zwcl 0634.1+4750, especially focusing on the possible presence of diffuse emission.
Methods: We present new Giant Metrewave Radio Telescope (GMRT) 320 MHz and Jansky Very Large Array (JVLA) 1.5 GHz observations o…
The environment of the SN-less GRB 111005A at z = 0.0133
Greiner, J.; Klose, S.; Schady, P. +5 more
The collapsar model has proved highly successful in explaining the properties of long γ-ray bursts (GRBs), with the most direct confirmation being the detection of a supernova (SN) coincident with the majority of nearby long GRBs. Within this model, a long GRB is produced by the core-collapse of a metal-poor, rapidly rotating, massive star. The de…
Multiple star systems in the Orion nebula
Henning, Thomas; Lin, Chien-Cheng; Mérand, Antoine +132 more
This work presents an interferometric study of the massive-binary fraction in the Orion Trapezium cluster with the recently comissioned GRAVITY instrument. We observed a total of 16 stars of mainly OB spectral type. We find three previously unknown companions for θ1 Ori B, θ2 Ori B, and θ2 Ori C. We determined a se…
A catalogue of dense cores and young stellar objects in the Lupus complex based on Herschel. Gould Belt Survey observations
Arzoumanian, D.; Könyves, V.; Palmeirim, P. +13 more
Context. How the diffuse medium of molecular clouds condenses in dense cores and how many of these cores will evolve in protostars is still a poorly understood step of the star formation process. Much progress is being made in this field, thanks to the extensive imaging of star-forming regions carried out with the Herschel Space Observatory.
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The magnetic environment of the Orion-Eridanus superbubble as revealed by Planck
Soler, J. D.; Bracco, A.; Pon, A.
Using the 353-GHz polarization observations by the Planck satellite we characterize the magnetic field in the Orion-Eridanus superbubble, a nearby expanding structure that spans more than 1600 square degrees in the sky. We identify a region of both low dispersion of polarization orientations and high polarization fraction associated with the outer…
Sulphur monoxide exposes a potential molecular disk wind from the planet-hosting disk around HD 100546
Booth, Alice S.; Walsh, Catherine; Loomis, Ryan A. +3 more
Sulphur-bearing volatiles are observed to be significantly depleted in interstellar and circumstellar regions. This missing sulphur is postulated to be mostly locked up in refractory form. With ALMA we have detected sulphur monoxide (SO), a known shock tracer, in the HD 100546 protoplanetary disk. Two rotational transitions: J = 77-6
X-ray study of the double radio relic Abell 3376 with Suzaku
Urdampilleta, I.; Kaastra, J. S.; Mernier, F. +5 more
We present an X-ray spectral analysis of the nearby double radio relic merging cluster Abell 3376 (z = 0.046), observed with the Suzaku XIS instrument. These deep (∼360 ks) observations cover the entire double relic region in the outskirts of the cluster. These diffuse radio structures are amongst the largest and arc-shaped relics observed in comb…
A CEMP-no star in the ultra-faint dwarf galaxy Pisces II
Salvadori, S.; Bonifacio, P.; Caffau, E. +3 more
Aims: A probable carbon enhanced metal-poor (CEMP) star, Pisces II 10694, was discovered recently in the ultra-faint (UFD) galaxy Pisces II. This galaxy is supposed to be very old, suspected to include dark matter, and likely formed the bulk of its stars before the reionisation of the Universe.
Methods: New abundances have been obtained …