Astrometric monitoring and orbit constraint of the GSC 08047−00232 system with VLT/NaCo

Astrometric monitoring and orbit constraint of the GSC 08047−00232 system with VLT/NaCo
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采用 VLT/NaCo 的 GSC 08047â00232 系统的天体测量监测和轨道约束

DOI:
10.1093/mnras/stt2263
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发表时间:
2014
影响因子:
4.8
通讯作者:
Schmidt T.O.B.
Schmidt T.O.B.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Ginski C;Mugrauer M;Neuhäuser R;Schmidt T.O.B.

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在附近恒星周围直接拍摄到的质量相对较大的亚星同伴形成了一类非常耐人寻味的天体。它们与主星相距较远,质量相对较高,这可能表明,通过原恒星盘的引力坍塌,形成了一种更像恒星的结构。然而,另一种可能性也是核心吸积(原地或更远,然后向外迁移)或引力原行星盘不稳定形成的。确定这些伴星的轨道参数将是对质量和编队场景施加约束的重要一步。此外,轨道曲率的探测将使我们能够排除偶然对准的可能性,从而证明主星和伴星正在相互轨道上运行。08047−00232的褐矮星伴星是由纽乌乌瑟等人平行发现的。和Chauvin等人。我们介绍了在过去4年中对该系统进行的新的天体测量。此外,我们还分析了该系统所有已有的天体测量数据点。在总时间基线超过10年的情况下,我们能够清楚地探测到主星和伴星之间的差异运动。此外,我们现在可以对伴星的可能轨道施加一些限制。
Relatively massive directly imaged substellar companions around nearby stars form a very intriguing class of objects. Their relatively high mass at wide separations from their host stars might suggest a more star-like formation via gravitational collapse in protostellar discs. However, also formation by core accretion (either in situ or further in and then migrating outwards) or gravitational protoplanetary disc instability is another possibility. Determining the orbit parameters of such companions will be an important step to put constraints on masses and formation scenarios. In addition, the detection of curvature in the orbits would enable us to exclude the possibility of a by-chance alignment, and would thus prove that the primary and companion are orbiting each other. The brown dwarf companion to GSC 08047−00232 was discovered in parallel by Neuhäuser et al. and Chauvin et al. We present new astrometric measurements of this system taken in the course of the past 4 years. In addition, we analyse all previously available astrometric data points of this system. With a total time baseline of more than 10 years, we were able to clearly detect differential motion between the primary star and companion. Furthermore, we can now put some constraints on the possible orbits of the companion.
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