EXTREME AO OBSERVATIONS OF TWO TRIPLE ASTEROID SYSTEMS WITH SPHERE

被引：24
|
作者：
Yang, B. [1 ,2 ]
Wahhaj, Z. [1 ]
Beauvalet, L. [3 ]
Marchis, F. [4 ]
Dumas, C. [1 ,5 ]
Marsset, M. [1 ]
Nielsen, E. L. [4 ,6 ]
Vachier, F. [7 ]
机构：
[1] European So Observ, Casilla 19001, Santiago 19, Chile
[2] Chinese Acad Sci, Yunnan Astron Observ, Kunming, Peoples R China
[3] Natl Observ, Rio De Janeiro, Brazil
[4] SETI Inst, Carl Sagan Ctr, Mountain View, CA USA
[5] TMT Int Observ, Pasadena, CA USA
[6] Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, Stanford, CA 94305 USA
[7] Inst Mecan Celeste & Calcul Ephemerides, Paris, France
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2016年 / 820卷 / 02期
关键词：
infrared: planetary systems; minor planets; asteroids:; individual; (130; Elektra; 93; Minerva); 45; EUGENIA; 87; SYLVIA; ORBITS;
D O I：
10.3847/2041-8205/820/2/L35
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present the discovery of a new satellite of asteroid (130) Elektra-S/2014 (130) 1-in differential imaging and in integral field spectroscopy data over multiple epochs obtained with Spectro-Polarimetric High-contrast Exoplanet Research/Very Large Telescope. This new (second) moonlet of Elektra is about 2 km across, on an eccentric orbit, and about 500 km away from the primary. For a comparative study, we also observed another triple asteroid system, (93) Minerva. For both systems, component-resolved reflectance spectra of the satellites and primary were obtained simultaneously. No significant spectral difference was observed between the satellites and the primary for either triple system. We find that the moonlets in both systems are more likely to have been created by sub-disruptive impacts as opposed to having been captured.
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页数：6
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