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Disk Evolution Study Through Imaging of Nearby Young Stars (DESTINYS): the SPHERE View of the Orion Star-Forming Region

Astronomy and Astrophysics(2024)

Univ Amsterdam | Univ Galway | INAF | Univ Cambridge | Univ Hawaii | Univ Grenoble Alps | Ludwig Maximilians Univ Munchen | Univ Milan | Univ Padua | European Southern Observ | Columbia Univ | Leiden Univ | Max Planck Inst Astron | Amer Univ Beirut | Diego Portales University

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Abstract
Context. Resolved observations at near-infrared (near-IR) and millimeter wavelengths have revealed a diverse population of planet-forming disks. In particular, near-IR scattered light observations usually target close-by, low-mass star-forming regions. However, disk evolution in high-mass star-forming regions is likely affected by the different environment. Orion is the closest high-mass star-forming region, enabling resolved observations to be undertaken in the near-IR. Aims. We seek to examine planet-forming disks, in scattered light, within the high-mass star-forming region of Orion in order to study the impact of the environment in a higher-mass star-forming region on disk evolution. Methods. We present SPHERE/IRDIS H-band data for a sample of 23 stars in the Orion star-forming region observed within the DESTINYS (Disk Evolution Study Through Imaging of Nearby Young Stars) program. We used polarization differential imaging in order to detect scattered light from circumstellar dust. From the scattered light observations we characterized the disk orientation, radius, and contrast. We analysed the disks in the context of the stellar parameters and the environment of the Orion star-forming region. We used ancillary X-shooter spectroscopic observations to characterize the central stars in the systems. We furthermore used a combination of new and archival ALMA mm-continuum photometry to characterize the dust masses present in the circumstellar disks. Results. Within our sample, we detect extended circumstellar disks in ten of 23 systems. Of these, three are exceptionally extended (V351 Ori, V599 Ori, and V1012 Ori) and show scattered light asymmetries that may indicate perturbations by embedded planets or (in the case of V599 Ori) by an outer stellar companion. Our high-resolution imaging observations are also sensitive to close (sub)stellar companions and we detect nine such objects in our sample, of which six were previously unknown. We find in particular a possible substellar companion (either a very low-mass star or a high-mass brown dwarf) 137 au from the star RY Ori. We find a strong anticorrelation between disk detection and multiplicity, with only two of our ten disk detections located in stellar multiple systems. We also find a correlation between scattered light contrast and the millimeter flux. This trend is not captured by previous studies of a more diversified sample and is due to the absence of extended, self-shadowed disks in our Orion sample. Conversely, we do not find significant correlations between the scattered light contrast of the disks and the stellar mass or age. We investigate the radial extent of the disks and compare this to the estimated far-ultraviolet (FUV) field strength at the system location. While we do not find a direct correlation, we notice that no extended disks are detected above an FUV field strength of similar to 300 G(0).
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protoplanetary disks,stars: individual: V351 Ori,stars: pre-main sequence
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要点】:本研究利用SPHERE/IRDIS H-带数据,在奥利安星形成区域对23颗恒星进行观测,探讨高质量星形成区域环境对行星形成盘演化的影响。

方法】:通过偏振差分成像技术检测 circumstellar 尘埃的散射光,以确定盘的取向、半径和对比度,并结合恒星参数和奥利安星形成区域环境进行分析。

实验】:在DESTINYS(通过成像附近年轻恒星研究行星形成盘演化)项目中,使用SPHERE/IRDIS H-带数据对奥利安星形成区域的23颗恒星进行了观测,并利用ALMA mm-连续波辐射测量数据分析了盘中的尘埃质量。研究发现,样本中十个系统存在扩展 circumstellar 盘,其中三个系统(V351 Ori、V599 Ori和V1012 Ori)显示出散射光的不对称性,可能表明有嵌入行星或外星伴星的扰动。同时,观测还发现了九个接近的(子)恒星伴星,其中六个是未知的新发现。研究发现盘检测与多重性之间存在强烈的负相关性,并发现散射光对比度与毫米波辐射通量之间存在相关性。此外,研究还探讨了盘的径向范围与系统位置的远紫外辐射场强度之间的关系。