X-shooter 跨区域与年龄探测原行星盘演化巡天(ARADE):猎户座A的吸积特性及其与原行星盘质量的关系
X-shooter survey Across Regions and Ages to probe Disk Evolution (ARADE): Accretion properties in Orion A and their relation with disk masses
- European Southern Observatory(欧洲南方天文台)
- Trinity College Dublin, the University of Dublin(都柏林三一学院,都柏林大学)
- Space Research Institute, Austrian Academy of Sciences(奥地利科学院空间研究所)
- Istituto Nazionale di Astrofisica (INAF)—Osservatorio Astronomico di Palermo(意大利国家天体物理研究所(INAF)—巴勒莫天文台)
- Maynooth University Department of Physics, National University of Ireland Maynooth(梅努斯大学物理系,爱尔兰国立大学梅努斯分校)
- University College Dublin(都柏林大学学院)
- Ludwig-Maximilians-Universität München(慕尼黑大学)
- Max-Planck-Institut für Extraterrestrische Physik(马克斯·普朗克地外物理学研究所)
机构由 AI 辅助整理,请以论文原文为准。
AI总结:
本研究利用VLT/X-Shooter对猎户座A的91颗带原行星盘的前主序星开展吸积特性研究,揭示其吸积标度关系与其他恒星形成区一致,未发现吸积率与FUV辐射的显著相关性,初步暗示原行星盘寿命随FUV增强可能缩短,为后续研究提供基础。
AI中文摘要:
我们呈现了一项利用甚大望远镜(VLT)/ X-Shooter 对整个猎户座A天区年轻恒星天体吸积过程的均匀研究。我们的样本包含91颗经斯皮策(Spitzer)测光证实拥有原行星盘的前主序星,其中34颗具有互补的阿塔卡马大型毫米波/亚毫米波阵列(ALMA)尘埃质量测量值。我们采用自洽的多成分拟合程序推导恒星与吸积特性,样本涵盖从K3型到M5型的光谱型,对应恒星质量在约0.8-0.1 M☉范围内。猎户座A中的吸积光度-恒星光度(L_acc-L_★)及质量吸积率-恒星质量(M_dot_acc-M_★)标度关系,与其他恒星形成区(SFRs)一致,这些SFRs跨越不同恒星密度、远紫外(FUV)辐射场及年龄,所有区域在参数空间中占据相同轨迹。对于34颗具有互补尘埃质量测量值的源,我们开展了猎户座A中M_dot_acc与原行星盘质量(M_disk)相关性的首次研究,得到的弥散度与其他区域报告值一致。尽管我们的样本在局地FUV场强度上跨越近五个数量级,但未发现M_dot_acc与FUV辐射存在统计显著的相关性。不过,将我们的样本与豺狼座(Lupus)、猎户座星云星团(ONC)及σ猎户座(σ Orionis)的文献测量值结合后,发现推断的原行星盘寿命t_disk = M_disk / M_dot_acc在FUV环境更强时呈暂态的整体水平下降,不过中等和高FUV场下存在大的固有弥散及有限样本量,无法得出明确结论。本文报告的均匀M_dot_acc测量值,为未来研究猎户座A及其他SFRs不同环境下的吸积与原行星盘演化提供了坚实基础。
英文摘要:
We present a homogeneous VLT/X-Shooter study of accretion in young stellar objects spanning the entire Orion A complex. Our sample includes 91 pre-main-sequence stars hosting a protoplanetary disk according to Spitzer photometry, of which 34 have complementary ALMA dust mass measurements. We derived stellar and accretion properties using a self-consistent multi-component fitting procedure. Our sample encompasses spectral types from K3 down to M5, corresponding to stellar masses within $\sim$0.8-0.1 $M_{\odot}$. The accretion-stellar luminosity ($L_{acc}-L_{\star}$) and the mass accretion rate-stellar mass ($\dot{M}_{acc}-M_{\star}$) scaling relations in Orion A are consistent with those of other star-forming regions (SFRs) that span a range of stellar densities, far-ultraviolet (FUV) irradiation fields, and ages, with all regions occupying the same locus in parameter space. For the 34 sources with complementary dust mass measurements, we present the first investigation of the $\dot{M}_{acc}$ and disk mass ($M_{disk}$) correlation in Orion A, recovering a spread consistent with that reported for other regions. Despite our sample spanning nearly five orders of magnitude in local FUV field strength, we find no statistically significant correlation between $\dot{M}_{acc}$ and FUV irradiation. However, by combining our sample with literature measurements in Lupus, the Orion Nebula Cluster, and $σ$ Orionis, we find a tentative population-level decrease of the inferred disk lifetime $t_{\rm disk} =M_{disk}/\dot{M}_{acc}$ toward stronger FUV environments, though large intrinsic scatter and limited sample sizes at intermediate and high FUV fields prevent firm conclusions. The homogeneous $\dot{M}_{acc}$ measurements reported here provide a solid foundation for future studies of accretion and disk evolution across the diverse environments of Orion A and other SFRs.