J Dennett-Thorpe,de Bruyn AG
J Dennett-Thorpe
We report on the discovery of a source that exhibits over 300% amplitude changes in radio flux density on the period of hours. This source, J1819+3845, is the most extremely variable extragalactic source known in the radio sky. We believe t...
CD Ball,MC McCarthy,P Thaddeus
CD Ball
A fairly strong molecular absorption band at 4429.27+/-0.04 Å, closely centered on the strongest diffuse interstellar band at 4428.9+/-1.4 Å, has been found in a supersonic molecular beam among the products of a discharge through benzene ...
An Experimental Study on the Structure of Cosmic Dust Aggregates and Their Alignment by Motion Relative to Gas [0.03%]
关于宇宙尘埃团簇结构及其相对于气体运动时排列方式的实验研究
G Wurm,J Blum
G Wurm
We experimentally studied the shape of dust grains grown in a cluster-cluster type of aggregation (CCA) and derived characteristic axial ratios to describe the nonsphericity. CCAs might be described by an axial ratio rhoCCA=rg,max&solm0;rg,...
Radio Tracking of a White-Light Coronal Mass Ejection from Solar Corona to Interplanetary Medium [0.03%]
从 solar corona 到 interplanetary介质的白色日冕物质抛射的无线跟踪研究
MJ Reiner,ML Kaiser,SP Plunkett et al.
MJ Reiner et al.
For a solar flare/coronal mass ejection (CME) event on 1999 May 3, type II radio emissions were observed from the metric through the hectometric wavelength regimes. By comparing the dynamics of the CME with that implied by the frequency ran...
A Twisted Flux Rope Model for Coronal Mass Ejections and Two-Ribbon Flares [0.03%]
日冕物质抛射和双耀斑带爆发的扭曲磁绳模型
T Amari,JF Luciani,Z Mikic et al.
T Amari et al.
We present a new approach to the theory of large-scale solar eruptive phenomena such as coronal mass ejections and two-ribbon flares, in which twisted flux tubes play a crucial role. We show that it is possible to create a highly nonlinear ...
D Charbonneau,TM Brown,DW Latham et al.
D Charbonneau et al.
We report high-precision, high-cadence photometric measurements of the star HD 209458, which is known from radial velocity measurements to have a planetary-mass companion in a close orbit. We detect two separate transit events at times that...
GW Henry,GW Marcy,RP Butler et al.
GW Henry et al.
Doppler measurements from Keck exhibit a sinusoidal periodicity in the velocities of the G0 dwarf HD 209458, having a semiamplitude of 81 m s-1 and a period of 3.5239 days, which is indicative of a "51 Peg-like" planet with a minimum mass (...
The Discovery of a Companion to the Very Cool Dwarf Gliese 569B with the Keck Adaptive Optics Facility [0.03%]
凯克自适应光学设施在Gliese 569B极冷矮星伴星的发现
EL Martín,CD Koresko,SR Kulkarni et al.
EL Martín et al.
We report observations obtained with the Keck adaptive optics facility of the nearby (d=9.8 pc) binary Gl 569. The system was known to be composed of a cool primary (dM2) and a very cool secondary (dM8.5) with a separation of 5&arcsec; (49 ...
L Bildsten,G Ushomirsky
L Bildsten
Recent work has raised the exciting possibility that r-modes (Rossby waves) in rotating neutron star cores might be strong gravitational-wave sources. We estimate the effect of a solid crust on their viscous damping rate and show that the d...
Period Clustering of the Anomalous X-Ray Pulsars and Magnetic Field Decay in Magnetars [0.03%]
anomalous x射线脉冲星的周期聚类和磁星磁场衰减
M Colpi,U Geppert,D Page
M Colpi
We confront theoretical models for the rotational, magnetic, and thermal evolution of an ultramagnetized neutron star, or magnetar, with available data on the anomalous X-ray pulsars (AXPs). We argue that, if the AXPs are interpreted as mag...