Asteroid lightcurve inversion with Bayesian inference | |
Muinonen, K.3,6; Torppa, J.2; Wang XB(王晓彬)1,5; Cellino, A.4; Penttilä, A.6 | |
刊名 | Astronomy and Astrophysics |
2020-10-13 | |
卷号 | 642 |
关键词 | ATMOSPHERELESS BODIES ROTATIONAL PROPERTIES OPTIMIZATION METHODS PHASE FUNCTION SHAPE PHOTOMETRY PARAMETERS SCATTERING MODELS G(1) |
ISSN号 | 0004-6361 |
DOI | 10.1051/0004-6361/202038036 |
产权排序 | 第4完成单位 |
文献子类 | Article |
英文摘要 | Context. We assess statistical inversion of asteroid rotation periods, pole orientations, shapes, and phase curve parameters from photometric lightcurve observations, here sparse data from the ESA Gaia space mission (Data Release 2) or dense and sparse data from ground-based observing programs. Aims. Assuming general convex shapes, we develop inverse methods for characterizing the Bayesian a posteriori probability density of the parameters (unknowns). We consider both random and systematic uncertainties (errors) in the observations, and assign weights to the observations with the help of Bayesian a priori probability densities. Methods. For general convex shapes comprising large numbers of parameters, we developed a Markov-chain Monte Carlo sampler (MCMC) with a novel proposal probability density function based on the simulation of virtual observations giving rise to virtual least-squares solutions. We utilized these least-squares solutions to construct a proposal probability density for MCMC sampling. For inverse methods involving triaxial ellipsoids, we update the uncertainty model for the observations. Results. We demonstrate the utilization of the inverse methods for three asteroids with Gaia photometry from Data Release 2: (21) Lutetia, (26) Proserpina, and (585) Bilkis. First, we validated the convex inverse methods using the combined ground-based and Gaia data for Lutetia, arriving at rotation and shape models in agreement with those derived with the help of Rosetta space mission data. Second, we applied the convex inverse methods to Proserpina and Bilkis, illustrating the potential of the Gaia photometry for setting constraints on asteroid light scattering as a function of the phase angle (the Sun-object-observer angle). Third, with the help of triaxial ellipsoid inversion as applied to Gaia photometry only, we provide additional proof that the absolute Gaia photometry alone can yield meaningful photometric slope parameters. Fourth, for (585) Bilkis, we report, with 1-σ uncertainties, a refined rotation period of (8.5750559 ± 0.0000026) h, pole longitude of 320.6° ± 1.2°, pole latitude of - 25.6° ± 1.7°, and the first shape model and its uncertainties from convex inversion. Conclusions. We conclude that the inverse methods provide realistic uncertainty estimators for the lightcurve inversion problem and that the Gaia photometry can provide an asteroid taxonomy based on the phase curves. |
学科主题 | 天文学 ; 太阳与太阳系 |
URL标识 | 查看原文 |
出版地 | 17, AVE DU HOGGAR, PA COURTABOEUF, BP 112, F-91944 LES ULIS CEDEX A, FRANCE |
资助项目 | Academy of Finland[1298137] ; Academy of Finland[1325805] ; European Research Council (ERC)[320773] ; National Natural Science Foundation of China (NSFC)[11673063] ; European COST Action[CA18104] ; University of Helsinki |
WOS关键词 | ATMOSPHERELESS BODIES ; ROTATIONAL PROPERTIES ; OPTIMIZATION METHODS ; PHASE FUNCTION ; SHAPE ; PHOTOMETRY ; PARAMETERS ; SCATTERING ; MODELS ; G(1) |
WOS研究方向 | Astronomy & Astrophysics |
语种 | 英语 |
出版者 | EDP SCIENCES S A |
WOS记录号 | WOS:000584570600016 |
资助机构 | Academy of Finland[1298137,1325805] ; European Research Council (ERC)[320773] ; National Natural Science Foundation of China (NSFC)[11673063] ; European COST Action[CA18104] ; University of Helsinki |
内容类型 | 期刊论文 |
源URL | [http://ir.ynao.ac.cn/handle/114a53/23724] |
专题 | 云南天文台_系外行星研究组 |
通讯作者 | Muinonen, K. |
作者单位 | 1.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing, 100049, China 2.Space Systems Finland, Kappelitie 6, Espoo, 02200, Finland 3.Finnish Geospatial Research Institute FGI, Geodeetinrinne 2, Masala, 02430, Finland 4.INAF, Osservatorio Astrofisico di Torino, Strada Osservatorio 20, Pino Torinese (TO), 10025, Italy 5.Yunnan Observatories, CAS, PO Box 110, Kunming, 650216, China 6.Department of Physics, University of Helsinki, Gustaf Hällströmin katu 2a, U. Helsinki, 00014, Finland |
推荐引用方式 GB/T 7714 | Muinonen, K.,Torppa, J.,Wang XB,et al. Asteroid lightcurve inversion with Bayesian inference[J]. Astronomy and Astrophysics,2020,642. |
APA | Muinonen, K.,Torppa, J.,Wang XB,Cellino, A.,&Penttilä, A..(2020).Asteroid lightcurve inversion with Bayesian inference.Astronomy and Astrophysics,642. |
MLA | Muinonen, K.,et al."Asteroid lightcurve inversion with Bayesian inference".Astronomy and Astrophysics 642(2020). |
个性服务 |
查看访问统计 |
相关权益政策 |
暂无数据 |
收藏/分享 |
除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。
修改评论