一颗围绕白矮星的碎片盘内运行的小行星
Christopher J Manser1, Boris T Gänsicke2,3, Siegfried Eggl4
1Department of Physics, University of Warwick, Coventry CV4 7AL, UK. c.j.manser92@googlemail.com.
概括
白矮星可能是行星系统的宿主,其中一些显示气体碎片盘. SDSS J122859.93+104032.9周围的碎片发出的稳定的123.4分钟周期信号表明,一个小行星是由它的内部强度保持在一起的.
科学领域:
- 天文学与天体物理学
- 外行星科学
背景情况:
- 白矮星是类似太阳的恒星的残余,可以从周围的天体中积聚物质.
- 一些白矮星系统具有气体碎片盘,可通过排放线检测,表明过去的积聚事件.
- 这些碎片盘的研究提供了关于恒星残骸周围行星系统的组成和演变的见解.
研究的目的:
- 为了研究白矮星周围气体碎片的性质.
- 分析来自白矮星SDSS J122859.93+104032.9周围碎片盘的排放线形状的周期性变化.
- 确定在碎片盘内观察到的短时间信号的来源.
主要方法:
- 观测天文学利用光谱来分析发射线形状.
- 时间序列分析以检测频谱数据的周期变化.
- 碎片盘动态和组成的建模.
主要成果:
- 在碎片盘的Ca ii排放线形状中检测到一个稳定的123.4分钟周期变化.
- 信号的特征表明在磁盘内存在一个紧的,固体.
- 观察到的周期性与一个由其自身的内部强度保持在一起的小行星一致.
结论:
- 这些发现为SDSS J122859.93+104032.9的碎片盘中存在一个小行星提供了强有力的证据.
- 这颗小行星很可能是恒星行星系统的残余,
- 这项研究突出了白矮星系统拥有完整行星的潜力,为研究行星系统进化提供了一个独特的实验室.
相关概念视频
Molecular Orbital Theory I
47.2K
Overview of Molecular Orbital Theory
47.2K
Atomic Orbitals
43.6K
An atomic orbital represents the three-dimensional regions in an atom where an electron has the highest probability to reside. The radial distribution function indicates the total probability of finding an electron within the thin shell at a distance r from the nucleus. The atomic orbitals have distinct shapes which are determined by l, the angular momentum quantum number. The orbitals are often drawn with a boundary surface, enclosing densest regions of the cloud.
43.6K
Molecular Orbital Theory II
27.1K
Molecular Orbital Energy Diagrams
27.1K
Hybridization of Atomic Orbitals II
48.5K
sp3d and sp3d 2 Hybridization
48.5K
Electron Orbital Model
72.0K
Orbitals are the areas outside of the atomic nucleus where electrons are most likely to reside. They are characterized by different energy levels, shapes, and three-dimensional orientations. The location of electrons is described most generally by a shell or principal energy level, then by a subshell within each shell, and finally, by individual orbitals found within the subshells.
The first shell is closest to the nucleus, and it has only one subshell with a single spherical orbital called the...
The first shell is closest to the nucleus, and it has only one subshell with a single spherical orbital called the...
72.0K
Hybridization of Atomic Orbitals I
66.5K
The mathematical expression known as the wave function, ψ, contains information about each orbital and the wavelike properties of electrons in an isolated atom. When atoms are bound together in a molecule, the wave functions combine to produce new mathematical descriptions that have different shapes. This process of combining the wave functions for atomic orbitals is called hybridization and is mathematically accomplished by the linear combination of atomic orbitals. The new orbitals that...
66.5K


