标题： 研究MWC 758中的点源与SPHERE 显示英文标题

标题： Investigating point sources in MWC 758 with SPHERE

摘要： 上下文。原行星盘中的旋臂可能被证明是由原行星激发并在盘的气态成分中传播的密度波的表现。在MWC 758系统中，已经在L波段识别出至少两个点源作为行星质量天体候选者。目标。我们使用VLT/SPHERE在H波段和K波段搜索这些候选者的对应体，并表征旋臂的形态。方法。数据通过现在标准的高对比度成像技术进行处理，以确定检测极限，并将其与从L波段观测得出的光度进行比较。结果。在考虑演化、大气和消光模型时，我们无法确认之前在L波段进行的两个点源检测。此外，从动力学角度分析旋臂并不支持这些候选者构成旋臂起源的假设。结论。需要更深入的观测和更长的时间尺度来确定MWC 758中旋臂的实际来源。 显示英文摘要

摘要： Context. Spiral arms in protoplanetary disks could be shown to be the manifestation of density waves launched by protoplanets and propagating in the gaseous component of the disk. At least two point sources have been identified in the L band in the MWC 758 system as planetary mass object candidates. Aims. We used VLT/SPHERE to search for counterparts of these candidates in the H and K bands, and to characterize the morphology of the spiral arms . Methods. The data were processed with now-standard techniques in high-contrast imaging to determine the limits of detection, and to compare them to the luminosity derived from L band observations. Results. In considering the evolutionary, atmospheric, and opacity models we were not able to confirm the two former detections of point sources performed in the L band. In addition, the analysis of the spiral arms from a dynamical point of view does not support the hypothesis that these candidates comprise the origin of the spirals. Conclusions. Deeper observations and longer timescales will be required to identify the actual source of the spiral arms in MWC 758.