The GD-1 Stellar Stream Perturber as a Core-collapsed Self-interacting Dark Matter Halo [0.03%]
GD-1恒星流扰动者作为一个核心塌缩的自相互作用暗物质晕
Xingyu Zhang,Hai-Bo Yu,Daneng Yang et al.
Xingyu Zhang et al.
The GD-1 stellar stream exhibits spur and gap structures that may result from a close encounter with a dense substructure. When interpreted as a dark matter subhalo, the perturber is denser than predicted in the standard cold dark matter (C...
Slowdown and Heating of Interstellar Neutral Helium by Elastic Collisions Beyond the Heliopause [0.03%]
日球层外星际中性氦通过弹性碰撞减速和加热
P Swaczyna,F Rahmanifard,E J Zirnstein et al.
P Swaczyna et al.
Direct sampling of interstellar neutral (ISN) atoms close to the Sun enables studies of the very local interstellar medium (VLISM) around the heliosphere. The primary population of ISN helium atoms has, until now, been assumed to reflect th...
NuSTAR Observation of a Minuscule Microflare in a Solar Active Region [0.03%]
NuSTAR观测到太阳活动区的一个微小微耀斑
Kristopher Cooper,Iain G Hannah,Brian W Grefenstette et al.
Kristopher Cooper et al.
We present X-ray imaging spectroscopy of one of the weakest active region (AR) microflares ever studied. The microflare occurred at ~11:04 UT on 2018 September 9 and we studied it using the Nuclear Spectroscopic Telescope ARray (NuSTAR) and...
Lindsay Glesener,Säm Krucker,Jessie Duncan et al.
Lindsay Glesener et al.
We report the detection of emission from a nonthermal electron distribution in a small solar microflare (GOES class A5.7) observed by the Nuclear Spectroscopic Telescope Array, with supporting observation by the Reuven Ramaty High Energy So...
How Sublimation Delays the Onset of Dusty Debris Disk Formation Around White Dwarf Stars [0.03%]
升华作用如何延缓白矮星周围尘埃碎片盘的形成时间
Jordan K Steckloff,John Debes,Amy Steele et al.
Jordan K Steckloff et al.
Although numerous white dwarf stars host dusty debris disks, the temperature distribution of these stars differs significantly from the white dwarf population as a whole. Dusty debris disks exist exclusively around white dwarfs cooler than ...
Thiols in the ISM: first detection of HC(O)SH and confirmation of C2H5SH [0.03%]
ISM中的硫醇类化合物：首次探测到HC(S)O和C2H5SH的确证
Lucas F Rodríguez-Almeida,Izaskun Jimenéz-Serra,Víctor M Rivilla et al.
Lucas F Rodríguez-Almeida et al.
The chemical compounds carrying the thiol group (-SH) have been considered essential in recent prebiotic studies regarding the polymerization of amino acids. We have searched for this kind of compounds toward the Galactic Centre quiescent c...
Cluster Analysis of Presolar Silicon Carbide Grains: Evaluation of Their Classification and Astrophysical Implications [0.03%]
前太阳硅酸盐尘粒的聚类分析：对其分类和天体物理含义的评价
Asmaa Boujibar,Samantha Howell,Shuang Zhang et al.
Asmaa Boujibar et al.
Cluster analysis of presolar silicon carbide grains based on literature data for 12C/13C, 14N/15N, δ 30Si/28Si, and δ 29Si/28Si including or not inferred initial 26Al/27Al data, reveals nine clusters agreeing with previously defined grain...
Explaining the Galilean Satellites' Density Gradient by Hydrodynamic Escape [0.03%]
通过流体动力学逃逸解释伽利略卫星的密度梯度
Carver J Bierson,Francis Nimmo
Carver J Bierson
The Galilean satellites exhibit a monotonic decrease in density (and increase in ice mass fraction) with distance from Jupiter (Pollack & Fanale 1982). Whether this is because of the background conditions when they formed (Lunine & Stevenso...
Ofer Cohen,Alex Glocer,Cecilia Garraffo et al.
Ofer Cohen et al.
We present a method to quantify the upper-limit of the energy transmitted from the intense stellar wind to the upper atmospheres of three of the Trappist-1 planets (e, f, and g). We use a formalism that treats the system as two electromagne...
Sarah E Gibson,Kevin Dalmasse,Laurel A Rachmeler et al.
Sarah E Gibson et al.
Magnetic fields in the Sun's outer atmosphere-the corona-control both solar-wind acceleration and the dynamics of solar eruptions. We present the first clear observational evidence of coronal magnetic nulls in off-limb linearly polarized ob...