Observational constraints to the dynamics of dust particles in the coma of comet 67P/Churyumov-Gerasimenko

被引:9
作者
Frattin, E. [1 ]
Bertini, I [2 ,3 ]
Ivanovski, S. L. [4 ]
Marzari, F. [1 ]
Fulle, M. [4 ]
Zakharov, V. V. [2 ,3 ]
Moreno, F. [5 ]
Naletto, G. [1 ]
Lazzarin, M. [1 ]
Cambianica, P. [6 ]
Cremonese, G. [6 ]
Ferrari, S. [7 ]
Ferri, F. [7 ]
Guettler, C. [8 ]
La Forgia, F. [1 ,2 ]
Lucchetti, A. [6 ]
Pajola, M. [6 ]
Penasa, L. [7 ]
Rotundi, A. [2 ,3 ]
Sierks, H. [8 ]
Tubiana, C. [3 ,8 ]
机构
[1] Univ Padua, Dipartimento Fis & Astron G Galilei, Vicolo Osservatorio 3, I-35122 Padua, Italy
[2] Univ Napoli Parthenope, Dipartimento Sci & Tecnol, CDN IC4, I-80143 Naples, Italy
[3] Inst Space Astrophys & Planetol IAPS INAF, Via Fosso Cavaliere 100, I-00133 Rome, Italy
[4] Ist Nazl Astrofis, Osservatorio Astron Trieste, Via GB Tiepolo 11, I-34143 Trieste, Italy
[5] CSIC, Inst Astrofis Andalucia, E-18008 Granada, Spain
[6] Ist Nazl Astrofis, Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy
[7] Univ Padua, Ctr Studies & Act Space CISAS G Colombo, Via Venezia 15, I-35131 Padua, Italy
[8] Max Planck Inst Solar Syst Res, Justus Von Liebig Weg 3, D-37077 Gottingen, Germany
关键词
methods: data analysis; techniques: image processing; techniques: photometric; comets: individual; EXPERIMENTAL PHASE FUNCTION; DIRECT MONTE-CARLO; LINEAR-POLARIZATION; INNER COMA; 2.2; AU; OSIRIS; SCATTERING; NUCLEUS; GIADA; COSIMA;
D O I
10.1093/mnras/stab1152
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
In this work, we aim to characterize the dust motion in the inner coma of comet 67P/Churyumov-Gerasimenko to provide constraints for theoretical 3D coma models. The OSIRIS camera on-board the Rosetta mission was able for the first time to acquire images of single dust particles from inside the cometary coma, very close to the nucleus. We analyse a large number of particles, performing a significant statistic of their behaviour during the post-perihelion period, when the spacecraft covered distances from the nucleus ranging between 80 and 400 km. We describe the particle trajectories, investigating their orientation and finding highly radial motion with respect to the nucleus. Then, from the particle brightness profiles, we derive a particle rotational frequency of nu < 3.6 Hz, revealing that they are slow rotators and do not undergo fragmentation. We use scattering models to compare the observed spectral radiance of the particles with the simulated ones in order to estimate their size, finding values that range from millimetres up to centimetres. The statistics performed in this paper provide useful parameters to constrain the cometary coma dynamical models.
引用
收藏
页码:4687 / 4705
页数:19
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