Gaia数据发布3：太阳系小天体的反射光谱
地球与行星天体物理
2023-06-28 v1
摘要
欧洲空间局（ESA）的Gaia任务自2014年8月运行开始便持续观测太阳系天体（SSOs）。Gaia第三次数据发布（DR3）首次包含了在2014年8月5日至2017年5月28日期间观测到的精选样本共60 518个SSO（主要为小行星）的平均反射光谱。每个反射光谱由蓝、红光度计（BP/RP）测量得到，并被分箱为16个离散波长带。我们描述了Gaia的SSO光谱数据处理，解释了用于筛选Gaia DR3中发布的小行星光谱子集的准则，以及内部验证流程的各步骤。为进一步评估Gaia SSO反射光谱的质量，我们对照文献中基于地基与天基望远镜获得的SSO反射光谱进行了外部验证。对每个所选SSO，通过将BP/RP在焦平面上每次过境观测的校准光谱除以太阳类比星的平均光谱，计算出历元反射率。后者通过对已知光谱与太阳极为相似的精选恒星样本的Gaia光谱测量值取平均得到。最后，对每个SSO在16个光谱带中计算历元反射光谱的平均值。对于明亮SSO，无论其分类光谱类型如何，Gaia平均反射光谱与文献值均吻合良好。我们识别出S型SSO的光谱斜率随相位角增大而增加。此外，我们表明随着S型小行星族年龄增大，光谱斜率增加且1微米吸收带深度减小。
引用
@article{arxiv.2206.12174,
title = {Gaia Data Release 3: Reflectance spectra of Solar System small bodies},
author = {Gaia Collaboration and L. Galluccio and M. Delbo and F. De Angeli and T. Pauwels and P. Tanga and F. Mignard and A. Cellino and A. G. A. Brown and K. Muinonen and A. Penttila and S. Jordan and A. Vallenari and T. Prusti and J. H. J. de Bruijne and F. Arenou and C. Babusiaux and M. Biermann and O. L. Creevey and C. Ducourant and D. W. Evans and L. Eyer and R. Guerra and A. Hutton and C. Jordi and S. A. Klioner and U. L. Lammers and L. Lindegren and X. Luri and C. Panem and D. Pourbaix and S. Randich and P. Sartoretti and C. Soubiran and N. A. Walton and C. A. L. Bailer-Jones and U. Bastian and R. Drimmel and F. Jansen and D. Katz and M. G. Lattanzi and F. van Leeuwen and J. Bakker and C. Cacciari and J. Castaneda and C. Fabricius and M. Fouesneau and Y. Frémat and A. Guerrier and U. Heiter and E. Masana and R. Messineo and N. Mowlavi and C. Nicolas and K. Nienartowicz and F. Pailler and P. Panuzzo and F. Riclet and W. Roux and G. M. Seabroke and R. Sordo and F. 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journal= {arXiv preprint arXiv:2206.12174},
year = {2023}
}
备注
30 pages, 26 figures