Search Publications
Physical properties and dynamical relation of the circular depressions on comet 67P/Churyumov-Gerasimenko
Jorda, L.; Lamy, P. L.; Lara, L. M. +52 more
Aims: We aim to characterize the circular depressions of comet 67P/Churyumov-Gerasimenko and investigate whether such surface morphology of a comet nucleus is related to the cumulative sublimation effect since becoming a Jupiter family comet (JFC).
Methods: The images from the Rosetta/OSIRIS science camera experiment are used to construc…
Mid-IR spectra of pre-main sequence Herbig stars: An explanation for the non-detections of water lines
Woitke, P.; Kamp, I.; Güdel, M. +7 more
Context. The mid-IR detection rate of water lines in disks around Herbig stars disks is about 5%, while it is around 50% for disks around T Tauri stars. The reason for this is still unclear.
Aims: In this study, we want to find an explanation for the different detection rates between low mass and high mass pre-main-sequence stars in the mid-I…
Effects of flare definitions on the statistics of derived flare distributions
Stegen, K.; Dominique, M.; Ryan, D. F. +2 more
The statistical examination of solar flares is crucial to revealing their global characteristics and behaviour. Such examinations can tackle large-scale science questions or give context to detailed single-event studies. However, they are often performed using standard but basic flare detection algorithms relying on arbitrary thresholds. This arbi…
Stratified NH and ND emission in the prestellar core 16293E in L1689N
Ceccarelli, C.; Caux, E.; Daniel, F. +6 more
Context. High degrees of deuterium fractionation are commonly found in cold prestellar cores and in the envelopes around young protostars. As it brings strong constraints to chemical models, deuterium chemistry is often used to infer core history or molecule formation pathways. Whereas a large number of observations are available regarding interst…
The far-infrared behaviour of Herbig Ae/Be discs: Herschel PACS photometry
Marshall, J. P.; Montesinos, B.; Mendigutía, I. +3 more
Herbig Ae/Be objects are pre-main sequence stars surrounded by gas- and dust-rich circumstellar discs. These objects are in the throes of star and planet formation, and their characterisation informs us of the processes and outcomes of planet formation processes around intermediate mass stars. Here we analyse the spectral energy distributions of d…
ALMA observations of the Th 28 protostellar disk. A new example of counter-rotation between disk and optical jet
Pinte, C.; Ménard, F.; Hales, A. +8 more
Aims: Recently, differences in Doppler shifts across the base of four close classical T Tauri star jets have been detected with the HST in optical and near-ultraviolet (NUV) emission lines, and these Doppler shifts were interpreted as rotation signatures under the assumption of steady state flow. To support this interpretation, it is necessar…
Light walls around sunspots observed by the Interface Region Imaging Spectrograph
Zhang, J.; Hou, Y. J.; Li, T. +1 more
Context. The Interface Region Imaging Spectrograph (IRIS) mission provides high-resolution observations of the chromosphere and transition region. Using these data, some authors have reported the new finding of light walls above sunspot light bridges.
Aims: We try to determine whether the light walls exist somewhere else in active regions in …
Comparison of absolute gain photometric calibration between Planck/HFI and Herschel/SPIRE at 545 and 857 GHz
Abergel, A.; Bernard, J. -P.; Crill, B. P. +14 more
We compare the absolute gain photometric calibration of the Planck/HFI and Herschel/SPIRE instruments on diffuse emission. The absolute calibration of HFI and SPIRE each relies on planet flux measurements and comparison with theoretical far-infrared emission models of planetary atmospheres. We measure the photometric cross calibration between the …
All-sky census of Galactic high-latitude molecular intermediate-velocity clouds
Kerp, J.; Winkel, B.; Lenz, D. +1 more
Context. The H I halo clouds of the Milky Way, and in particular the intermediate-velocity clouds (IVCs), are thought to be connected to Galactic fountain processes. Observations of fountain clouds are important for understanding the role of matter recycling and accretion onto the Galactic disk and subsequent star formation.
Aims: Here, we qu…
Dynamical analysis of the complex radio structure in 3C 293: clues on a rapid jet realignment in X-shaped radio galaxies
Stawarz, Ł.; Weżgowiec, M.; Jamrozy, M. +1 more
Context. Radio galaxies classified as X-shaped/winged, are characterised by two pairs of extended and misaligned lobes, which suggest a rapid realignment of the jet axis, for which a potential cause (including binary supermassive black holes, a black hole merger, or a Lense-Thirring precession) is still under debate.
Aims: Here we analyse the…