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Gaia 白矮星红外余量 I. 100 pc 目录

Gaia white dwarfs with infrared excess I. The 100 pc catalogue

Centro de Astrobiología (CAB), CSIC-INTA(天体生物学中心);Departament de Física, Universitat Politècnica de Catalunya(加泰罗尼亚理工大学物理系);Institut d’Estudis Espacials de Catalunya(加泰罗尼亚空间研究所)

R. Murillo-Ojeda, F. M. Jiménez-Esteban, A. Rebassa-Mansergas, S. Torres

AI总结:

本文通过合成光度学分析Gaia数据,构建了100 pc内具有红外余量的白矮星目录,发现其中约75%为新发现,且红外余量白矮星比例高于以往研究,但与近期估计一致。

摘要:

红外余量白矮星的存在与碎屑盘或亚恒星伴星的存在有关。这些系统为研究系外行星物质和双星演化提供了重要线索。然而,完全表征其性质需要统计上显著且完整的样本。本研究旨在识别太阳附近100 pc范围内具有红外余量发射的白矮星完整样本。我们利用J-PAS系统56个光学滤光片的合成光度学,在Gaia数据释放3低分辨率光谱基础上,结合虚拟天文馆(VO)最新红外光度计数据,构建了白矮星的光谱能量分布(SED)。根据源光谱类型,使用VOSA拟合不同大气白矮星模型。我们通过光学和红外图像视觉检查以识别受污染的光度计数据。我们构建了包含456个红外余量白矮星的目录,其中292个为可靠识别,164个为候选。351(约75%)为新识别。这表明红外余量白矮星的比例在5.9±0.3%至9.2±0.4%之间,比以往研究更高,但与一些较新的估计一致。此外,对于红外余量白矮星样本,Gaia GBP-GRP颜色越高,非氢大气源的比例越高,这与一般白矮星群体相反。然而,这一结果应谨慎解释。此外,我们还对本目录与以往研究的比较进行了彻底分析。本研究中呈现的太阳附近100 pc范围内红外余量白矮星样本是迄今为止最大、最完整且最可靠的。由于其接近性,它们是后续研究的理想目标,旨在表征恒星周围盘、亚恒星伴星以及吸积行星物质的组成。

英文摘要:

The presence of infrared excess flux observed in white dwarfs (WDs) is related to the existence of debris disks or substellar companions. These systems provide important clues in the study of extrasolar planetary material and binary evolution. However, fully characterising their properties requires a statistically significant, complete sample. This work aims to identify a complete sample of WDs with infrared excess emission within 100 pc of the Sun. We built the spectral energy distributions (SEDs) of the WDs using synthetic photometry in 56 optical filters of the J-PAS system, generated from Gaia Data Release 3 low-resolution spectra and complemented with the latest infrared photometry available at the Virtual Observatory (VO). VOSA was used to fit the SEDs with different atmospheric WD models depending on the source spectral type. We visually checked optical and infrared images to identify contaminated photometry. We built a catalogue of 456 infrared excess WDs, of which 292 are robust identifications, and 164 are candidates. 351 ($\sim$75%) are new identifications. This implies a fraction of infrared excess WDs between 5.9$\pm$0.3% and 9.2$\pm$0.4%, higher than previous works, but in agreement with some more recent estimates. Furthermore, for the sample of infrared excess WDs, the fraction of sources with non-hydrogen atmosphere increases with the Gaia GBP-GRP colour, contrary to the general WD population. However, this result should be interpreted with caution. Additionally, a thorough comparison of our catalogue with those of previous studies was performed. The sample of WDs with infrared excess emission within 100 pc presented in this work is the largest, most complete and reliable to date. Due to their proximity, they are ideal targets for follow-up studies aimed at characterising circumstellar disks, substellar companions, and the composition of accreted planetary material.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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