PDS 70的拱星盘、行星及卫星

PDS 70的拱星盘、行星及卫星

ByNASA中文

2021年8月24日 PDS 70: Disk, Planets, and Moons Image Credit: VLT/MUSE (ESO); M. Benisty et al. Explanation: It’s not the big disk that’s attracting the most attention. Although the big planet-forming disk around the star PDS 70 is clearly imaged and itself quite interesting. It’s also not the planet on the right, just inside the big disk, that’s being talked about the most. Although the planet PDS 70c is a newly formed and, interestingly, similar in size and mass to Jupiter. It’s the fuzzy patch around the planet PDS 70c that’s causing the commotion. That fuzzy patch is thought to be itself a dusty disk that is now forming into moons — and that has never been seen before. The featured image was taken by the…

HD 163296：形成中恒星的喷流

HD 163296：形成中恒星的喷流

ByNASA中文

2021年06月22日 HD 163296: Jet from a Star in Formation Image Credit: Visible: VLT/MUSE (ESO); Radio: ALMA (ESO/NAOJ/NRAO) Explanation: How are jets created during star formation? No one is sure, although recent images of the young star system HD 163296 are quite illuminating. The central star in the featured image is still forming but seen already surrounded by a rotating disk and an outward moving jet. The disk is shown in radio waves taken by the Atacama Large Millimeter Array (ALMA) in Chile, and show gaps likely created by the gravity of very-young planets. The jet, shown in visible light taken by the Very Large Telescope (VLT, also in Chile), expels fast-moving gas — mostly hydrogen — from the disk center. The system spans hundreds of…

猎户座GW星：有侧倾拱星环的恒星系统

猎户座GW星：有侧倾拱星环的恒星系统

ByNASA中文

2020年9月29日 GW Orionis: A Star System with Tilted Rings Animation Illustration Credit: ESO, U. Exeter, S. Kraus et al., L. Calçada Explanation: Triple star system GW Orionis appears to demonstrate that planets can form and orbit in multiple planes. In contrast, all the planets and moons in our Solar System orbit in nearly the same plane. The picturesque system has three prominent stars, a warped disk , and inner tilted rings of gas and grit. The featured animation characterizes the GW Ori system from observations with the European Southern Observatory’s VLT and ALMA telescopes in Chile. The first part of the illustrative video shows a grand vista of the entire system from a distant orbit, while the second sequence takes you inside the tilted rings…