The vital role of international broadcasting during times of international conflict has gained increasing attention; however, national variations in terms of communication strategies have rarely... Show moreThe vital role of international broadcasting during times of international conflict has gained increasing attention; however, national variations in terms of communication strategies have rarely been explored in depth. This study fills this research gap by providing a comparative analysis of the communication strategies of Chinese and Russian state-sponsored international broadcasters. By examining CGTN’s coverage of the South China Sea arbitration and RT’s coverage of the Ukraine crisis in 2014, we find that the Chinese international broadcaster preferred official Chinese sources and a peace frame during a time of conflict, whereas its Russian counterpart tended to engage with Western countercultural speakers and present conflict frames. We further interpret the two media’s different usage of sources and frames in the light of the media’s organizational culture and the sponsoring states’ national identities. The research advances the scholarship on the increasingly intensive information war between the East and the West through the way international broadcasters cover international conflicts. It enriches our understanding of the cultural and national dynamics underpinning the non-Western emerging countries’ approaches of international communication. Show less
Vigan, A.; Fontanive, C.; Meyer, M.; Biller, B.; Bonavita, M.; Feldt, M.; ... ; Wildi, F. 2021
Context. Shadows in scattered light images of protoplanetary disks are a common feature and support the presence of warps or misalignments between disk regions. These warps are possibly caused by... Show moreContext. Shadows in scattered light images of protoplanetary disks are a common feature and support the presence of warps or misalignments between disk regions. These warps are possibly caused by an inclined (sub-)stellar companion embedded in the disk.Aims. We aim to study the morphology of the protoplanetary disk around the Herbig Ae star HD 139614 based on the first scattered light observations of this disk, which we model with the radiative transfer code MCMax3D.Methods. We obtained J- and H-band observations that show strong azimuthal asymmetries in polarized scattered light with VLT/SPHERE. In the outer disk, beyond similar to 30 au, a broad shadow spans a range of similar to 240 deg in position angle, in the east. A bright ring at similar to 16 au also shows an azimuthally asymmetric brightness, with the faintest side roughly coincidental with the brightest region of the outer disk. Additionally, two arcs are detected at similar to 34 and similar to 50 au. We created a simple four-zone approximation to a warped disk model of HD 139614 in order to qualitatively reproduce these features. The location and misalignment of the disk components were constrained from the shape and location of the shadows they cast.Results. We find that the shadow on the outer disk covers a range of position angles too wide to be explained by a single inner misaligned component. Our model requires a minimum of two separate misaligned zones - or a continuously warped region - to cast this broad shadow on the outer disk. A small misalignment of similar to 4 degrees between adjacent components can reproduce most of the observed shadow features.Conclusions. Multiple misaligned disk zones, potentially mimicking a warp, can explain the observed broad shadows in the HD 139614 disk. A planetary mass companion in the disk, located on an inclined orbit, could be responsible for such a feature and for the dust-depleted gap responsible for a dip in the SED. Show less
