搜索结果: 1-15 共查到“知识库 行星际物理学”相关记录38条 . 查询时间(0.931 秒)
中国科学院地质与地球物理研究所等研究发现水星东向环电流（图）
水星 东向环电流 全球偶极磁场
2022/9/14
水星是太阳系中距离太阳最近的一颗行星。上世纪70年代，水手10号两次近距离掠飞水星，发现水星可能存在全球偶极磁场。2011年，美国信使号成为首个环绕水星探测的飞船，并开启了长达四年的连续在轨监测。信使号的观测证实了水星存在一个较弱的全球偶极磁场，其磁偶极矩约为地球偶极矩的万分之四，表明水星内核磁场发电机要远弱于地球当前内核磁场发电机。与地球磁层类似，水星磁场与外部太阳风的相互作用也能形成一个磁层空...
火星重力场模型发展回顾及对萤火一号的展望
火星 重力场 萤火一号
2012/9/12
首先回顾了火星重力场探测的历史、各有关探测器的轨道特征和获取的资料情况，特别对最成功的MGS项目的情况作了详细介绍。然后对确定火星重力场模型过程中的有关问题作了介绍，包括动力学模型、三体摄动问题、太阳光压和大气阻力模型等。重点介绍了其中的先验条件和求解重力场的算法，后者主要介绍GSFC采用的最小二乘法和先验约束方法及其数据定权和误差校准的经验。文中还对火星重力场与地形学进行了比较分析，并对火星重力...
Gaps in Protoplanetary Disks as Signatures of Planets: I. Methodology and Validation
planet disk interactions protoplanetary disks planets and satellites detection radiative
2012/2/23
We examine the observational consequences of partial gaps being opened by planets in protoplanetary disks. We model the disk using a static alpha-disk model with detailed radiative transfer, parametri...
The Radial Velocity Signature of Tides Raised in Stars Hosting Exoplanets
stars: planetary systems – stars: solar type – hydrodynamics – waves – planet-star interactions
2011/10/18
Close-in, massive exoplanets raise significant tides in their stellar hosts. We compute the radial velocity (RV) signal due to this fluid motion in the equilibrium tide approximation. The predicted ra...
We analyse the chromospherical activity of stars with extrasolar planets and search for a possible correlation between the equivalent width of the core of Ca II K line and orbital parameters of the pl...
Fitting dwarf galaxy rotation curves with conformal gravity
Fitting dwarf galaxy rotation curves conformal gravity
2011/10/20
We continue our study of the application of the conformal gravity theory to galactic rotation curves. Previously we had studied a varied 111 spiral galaxy sample consisting of high surface brightness ...
The HARPS search for southern extra-solar planets. XXXI. Magnetic activity cycles in solar-type stars: statistics and impact on precise radial velocities
Planetary systems – Stars: activity – Stars: chromospheres – Line: profi les – Techniques: radial velocities – Techniques:spectroscopic
2011/10/17
Context. Searching for extrasolar planets through radial velocity measurements relies on the stability of stellar photospheres. Aims. We aim at characterizing the statistical properties of magnetic ac...
LoCuSS: The Sunyaev-Zel'dovich Effect and Weak Lensing Mass Scaling Relation
dovich Effect Weak Lensing Mass Scaling Relation
2011/10/21
We present the first weak-lensing-based scaling relation between galaxy cluster mass, M_wl, and integrated Compton parameter Y_sph. Observations of 18 galaxy clusters at z~0.2 were obtained with the S...
Tidal interactions in multi-planet systems
Planet formation Planetary systems Resonances Tidal interactions
2011/10/13
We study systems of close orbiting planets evolving under the influence of tidal circularization. It is supposed that a commensurability forms through the action of disk induced migration and orbital ...
Measurement requirements for a near-Earth asteroid impact mitigation demonstration mission
Near-Earth Asteroids Impact Mitigation Spacecraft Missions
2011/10/12
A concept for an Impact Mitigation Preparation Mission, called Don Quijote, is to send two spacecraft to a Near-Earth Asteroid (NEA): an Orbiter and an Impactor. The Impactor collides with the asteroi...
Physical Structure of the Planetary Nebula NGC 3242 from the Hot Bubble to the Nebular Envelope
Physical Structure Planetary Nebul Hot Bubble Nebular Envelope
2011/10/12
One key feature of the interacting stellar winds model of the formation of planetary nebulae (PNe) is the presence of shock-heated stellar wind confined in the central cavities of PNe. This so-called ...
Kepler and Ground-based Transits of the Exo-Neptune HAT-P-11b
Kepler Ground-based Transits Exo-Neptune HAT-P-11b
2011/10/9
We analyze 26 archival Kepler transits of the exo-Neptune HAT-P-11b, supplemented by ground-based transits observed in the blue (B-band) and near-IR (J-band). Both the planet and host star are smaller...
Magnetorotational Instability Driven Accretion in Protoplanetary Disks
Instability Driven Accretion Protoplanetary
2011/10/9
The gas dynamics in protoplanetary disks (PPDs) is strongly affected by non-ideal MHD effects. Using a complex chemical reaction network with standard prescriptions for X-ray and cosmic-ray ionization...
Horizon synthesis for archaeo-astronomical purposes
Methods: numerical – General: history and philosophy of astronomy
2011/10/18
In this paper I describe a simple numerical procedure to compute synthetic horizon altitude profiles for any given site. The method makes use of a simplified model of local Earth's curvature, and it i...
PTF1 J071912.13+485834.0: An outbursting AM CVn system discovered by a synoptic survey
outbursting system discovered synoptic survey
2011/9/29
We present extensive photometric and spectroscopic observations of PTF1 J071912.13+485834.0, an outbursting AM CVn system discovered by the Palomar Transient Factory (PTF). AM CVn systems are stellar ...