近日，美国国家天文台斯巴鲁望远镜团队的Thayne Currie与日本国家天文台Masahiko Hayashi以及东京大学的Jungmi Kwon等人合作，成功实现了环绕加速恒星运行的气态巨行星的直接成像和天体测量探测。相关研究成果已于
该研究团队使用了Gaia天体测量学和Hipparcos航天器的天文数据，发现了围绕邻近恒星HIP 99770运动的气态巨行星的动力学证据。通过使用Subaru冠状极端自适应光学仪器进行直接成像技术证实了这一行星的探测。该行星命名为HIP 99770 b，距其母星17个天文单位，接收到的光线量类似于木星。
行星的动力学质量为13.9至16.1个木星质量，而行星与母星的质量比 [(7至8) × 10-3] 类似于其他直接成像的行星。行星的大气光谱表明，它类似于之前成像的HR 8799周围的外行星，但比它们更为古老且云层更少。
据介绍，直接成像气态巨行星能够提供关于它们大气层的信息以及行星系统的结构。然而，通过直接成像在盲目勘测中只探测到了很少的行星。
附：英文原文
Title: Direct imaging and astrometric detection of a gas giant planet orbiting an accelerating star
Author: Thayne Currie, G. Mirek Brandt, Timothy D. Brandt, Brianna Lacy, Adam Burrows, Olivier Guyon, Motohide Tamura, Ranger Y. Liu, Sabina Sagynbayeva, Taylor Tobin, Jeffrey Chilcote, Tyler Groff, Christian Marois, William Thompson, Simon J. Murphy, Masayuki Kuzuhara, Kellen Lawson, Julien Lozi, Vincent Deo, Sebastien Vievard, Nour Skaf, Taichi Uyama, Nemanja Jovanovic, Frantz Martinache, N. Jeremy Kasdin, Tomoyuki Kudo, Michael McElwain, Markus Janson, John Wisniewski, Klaus Hodapp, Jun Nishikawa, Krzysztof Heminiak, Jungmi Kwon, Masahiko Hayashi
Issue&Volume: 2023-04-14
Abstract: Direct imaging of gas giant exoplanets provides information on their atmospheres and the architectures of planetary systems. However, few planets have been detected in blind surveys with direct imaging. Using astrometry from the Gaia and Hipparcos spacecraft, we identified dynamical evidence for a gas giant planet around the nearby star HIP 99770. We confirmed the detection of this planet with direct imaging using the Subaru Coronagraphic Extreme Adaptive Optics instrument. The planet, HIP 99770 b, orbits 17 astronomical units from its host star, receiving an amount of light similar to that reaching Jupiter. Its dynamical mass is 13.9 to 16.1 Jupiter masses. The planet-to-star mass ratio [(7 to 8) × 10-3] is similar to that of other directly imaged planets. The planet’s atmospheric spectrum indicates an older, less cloudy analog of the previously imaged exoplanets around HR 8799.
DOI: abo6192
Source: https://www.science.org/doi/10.1126/science.abo6192