The varying accretion at PDS 70

IF 14.3 1区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Nature Astronomy Pub Date : 2025-03-14 DOI:10.1038/s41550-025-02522-w
Luca Maltagliati
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PDS 70的吸积变化
PDS 70是一颗非常年轻的恒星,年龄约为5myr,拥有两颗在宽轨道上的巨大系外行星(PDS 70b在~21天文单位,PDS 70c在~34天文单位),嵌在其原行星盘中。这两颗系外行星都被直接成像,因此为观察行星形成过程提供了一个难得的窗口。Laird Close及其同事和Yifan Zhou及其合著者提出了两项独立研究,重点关注仍然知之甚少的吸积过程。两者都分析了Hα发射的观测结果,这是由圆盘上的氢气吸积到行星上的结果。Close等人使用magaox——6.5米麦哲伦克莱望远镜上的极端自适应光学系统——从三年(2022 - 2024)的三次观测中提取了h - α通量,并表明这两颗原行星的h - α通量是显著变化的:PDS 70b在2022年至2024年间变暗了近5倍,PDS 70c在2022年至2024年间变亮了约2.5倍。Zhou等人的工作证实了PDS 70 c的结果,他们使用了2024年获得的哈勃数据,并将其与2020年发表的观测结果进行了比较:原行星的Hα通量增加了一倍多。PDS 70b的初步结果表明,Hα发射显著减少,但需要进一步验证。
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来源期刊
Nature Astronomy
Nature Astronomy Physics and Astronomy-Astronomy and Astrophysics
CiteScore
19.50
自引率
2.80%
发文量
252
期刊介绍: Nature Astronomy, the oldest science, has played a significant role in the history of Nature. Throughout the years, pioneering discoveries such as the first quasar, exoplanet, and understanding of spiral nebulae have been reported in the journal. With the introduction of Nature Astronomy, the field now receives expanded coverage, welcoming research in astronomy, astrophysics, and planetary science. The primary objective is to encourage closer collaboration among researchers in these related areas. Similar to other journals under the Nature brand, Nature Astronomy boasts a devoted team of professional editors, ensuring fairness and rigorous peer-review processes. The journal maintains high standards in copy-editing and production, ensuring timely publication and editorial independence. In addition to original research, Nature Astronomy publishes a wide range of content, including Comments, Reviews, News and Views, Features, and Correspondence. This diverse collection covers various disciplines within astronomy and includes contributions from a diverse range of voices.
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