Search Publications
Potential multi-component structure of the debris disk around HIP 17439 revealed by Herschel/DUNES
Krivov, A. V.; Eiroa, C.; Löhne, T. +16 more
Context. The dust observed in debris disks is produced through collisions of larger bodies left over from the planet/planetesimal formation process. Spatially resolving these disks permits to constrain their architecture and thus that of the underlying planetary/planetesimal system.
Aims: Our Herschel open time key program DUNES aims at detec…
A Herschel view of IC 1396 A: Unveiling the different sequences of star formation
Henning, Thomas; Currie, Thayne; Rivière-Marichalar, Pablo +5 more
Context. The IC 1396 A globule, located to the west of the young cluster Tr 37, is known to host many very young stars and protostars, and is also assumed to be a site of triggered star formation.
Aims: Our aim is to test the triggering mechanisms and sequences leading to star formation in Tr 37 and similar regions.
Methods: We mapped IC…
The white dwarf cooling sequence of 47 Tucanae
Althaus, Leandro G.; Torres, Santiago; Miller Bertolami, Marcelo M. +1 more
Context. 47 Tucanae is one of the most interesting, well-observed, and theoretically studied globular clusters. This allows us to determine the reliability of our understanding of white dwarf cooling sequences, to compare different methods of determining its age, and to assess other important characteristics, such as its star formation history.
Cassini ISS mutual event astrometry of the mid-sized Saturnian satellites 2005-2012
Cooper, N. J.; Lainey, V.; Murray, C. D. +3 more
Aims: We present astrometric observations of the Saturnian satellites Mimas, Enceladus, Tethys, Dione, and Rhea from Cassini Imaging Science Subsystem (ISS) narrow-angle camera (NAC) images. Image sequences were designed to observe mutual occultations between these satellites.
Methods: The positions of satellite centres were estimated by…
Kinematics of the ionized-to-neutral interfaces in Monoceros R2
Ossenkopf, V.; Cernicharo, J.; Gerin, M. +10 more
Context. Monoceros R2 (Mon R2), at a distance of 830 pc, is the only ultra-compact H ii region (UC H ii) where its associated photon-dominated region (PDR) can be resolved with the Herschel Space Observatory.
Aims: Our aim is to investigate observationally the kinematical patterns in the interface regions (i.e., the transition from atomic to …
Investigating the hard X-ray emission from the hottest Abell cluster A2163 with Suzaku
Pratt, G. W.; Reiprich, T. H.; Ota, N. +3 more
Context. We present the results from Suzaku of the hottest Abell galaxy cluster
Aims: To study the physics of gas heating in cluster mergers, we investigated hard X-ray emission from the merging cluster
Methods: We analyzed ha…
Simultaneous XMM-Newton and HST-COS observation of 1H 0419-577. II. Broadband spectral modeling of a variable Seyfert galaxy
Kaastra, J. S.; Costantini, E.; Ebrero, J. +3 more
In this paper, we present the longest exposed (97 ks) XMM-Newton EPIC-pn spectrum ever obtained for the Seyfert 1.5 galaxy1H 0419-577. With the aim of explaining the broadband emission of this source, we took advantage of the simultaneous coverage in the optical/UV that was provided in the present case by the XMM-Newton Optical Monitor and by a HS…
Collisional modelling of the debris disc around HIP 17439
Krivov, A. V.; Eiroa, C.; Löhne, T. +3 more
We present an analysis of the debris disc around the nearby K2 V star HIP 17439. In the context of the Herschel DUNES key programme, the disc was observed and spatially resolved in the far-IR with the Herschel PACS and SPIRE instruments. In a previous study, we assumed that the size and radial distribution of the circumstellar dust are independent…
Constraints on the subsurface structure and density of the nucleus of Comet 67P/Churyumov-Gerasimenko from Arecibo radar observations
Lamy, P. L.; Toth, I.; Herique, A. +1 more
Context. Little is known about the internal structure of cometary nuclei. In addition to understanding their accretion in the early solar nebula and their subsequent evolution in the solar system, we find this question to be of acute and timely interest in the case of 67P/Churyumov-Gerasimenko (hereafter 67P/C-G) due to be visited by the Rosetta s…
Hierarchical analysis of the quiet-Sun magnetism
Asensio Ramos, A.; Martínez González, M. J.
Standard statistical analysis of the magnetic properties of the quiet Sun rely on simple histograms of quantities inferred from maximum-likelihood estimations. Because of the inherent degeneracies, either intrinsic or induced by the noise, this approach is not optimal and can lead to highly biased results. We carried out a meta-analysis of the mag…