Euclid对巴纳德30暗云的早期释放观测 I. 该星协核心的褐矮星与行星质量候选成员
Euclid Early Release Observations of the Barnard 30 dark cloud I. Brown dwarfs and planetary mass candidate members at the core of the association
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中文总结 AI 辅助
本研究利用Euclid观测数据，结合DeNeb工具等方法，在巴纳德30暗云新发现23个亚恒星候选成员，扩展了该区域暗弱冷源种群，验证了多波段测光选择方法的可靠性。
中文摘要 AI 辅助
本研究旨在识别巴纳德30暗云中的极质量成员，重点探测亚恒星域内的天体，包括行星质量范围内的天体。我们利用Euclid任务的深场测光观测数据，结合先进的数据处理技术，特别是用于优化源探测的DeNeb工具，还分析了多波段辅助观测数据，并对每个候选成员进行了光谱能量分布分析。此外，我们为一个候选天体获取了低分辨率近红外光谱，以进一步评估其性质和特征。我们的初始测光分析得到了近100个亚恒星质量范围的候选成员样本，其中23个位于3 Myr等时线附近的可能成员子样本已被确认，这大幅扩展了该区域相关的暗弱冷源的已知种群。对其中一个候选天体的低分辨率近红外光谱分析显示其光谱类型为L2，重力较低，符合年轻超冷矮星的特征；若其成员身份得到确认，其估计质量处于15-20 Mjup范围内。这些发现验证了我们多波段测光选择方法的可靠性，为初始质量函数（IMF）的低质量端提供了有价值的见解，并证明了Euclid在近邻密集恒星形成区中识别褐矮星与行星质量候选天体的有效性。
英文摘要
This study aims to identify very low-mass members within the Barnard 30 dark cloud, with a particular focus on detecting objects in the substellar domain, including those within the planetary-mass regime. We employed deep photometric observations using data from the Euclid mission, incorporating advanced data processing techniques, in particular the DeNeb tool for optimized source detection. We also analyze multi-wavelength ancillary observations and perform a Spectral Energy Distribution analysis for each candidate member. In addition, low-resolution near-infrared spectroscopy was obtained for one candidate to further assess its nature and properties. Our initial photometric analysis yielded a initial sample of nearly one hundred candidate members in the substellar mass range. A subsample of 23 probable members, located close to the 3 Myr isochrone, has been identified. Thus, we have substantially expanded the known population of faint, cool sources associated with the region. Low resolution near-IR spectroscopic analysis of one candidate reveals an L2 spectral type with low gravity, consistent with a young ultra-cool dwarf. If its membership is confirmed, its estimated mass lies in the range 15-20 Mjup. These findings validate the reliability of our multi-wavelength photometric selection methodology. These results offer valuable insights into the low-mass end of the initial mass function (IMF) and demonstrate the effectiveness of Euclid in identifying brown dwarf and planetary-mass candidates in nearby, densely packed star-forming regions.
