Radial-velocity discovery of a second planet in the TOI-1338/BEBOP-1 circumbinary system

Radial-velocity discovery of a second planet in the TOI-1338/BEBOP-1 circumbinary system
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TOI-1338/BEBOP-1 环双星系统中第二颗行星的径向速度发现

DOI:
10.1038/s41550-023-01948-4
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发表时间:
2023
期刊:
影响因子:
14.1
通讯作者:
Cameron, Andrew Collier
Cameron, Andrew Collier
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Standing, Matthew R.;Sairam, Lalitha;Martin, David V.;Triaud, Amaury H.;Correia, Alexandre C.;Coleman, Gavin A.;Baycroft, Thomas A.;Kunovac, Vedad;Boisse, Isabelle;Cameron, Andrew Collier

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环绕双星运行的行星,也就是围绕中心双星系统的两颗恒星运行的行星,挑战了我们对行星形成的理解。由于只有12个已知的双星系统拥有环绕双星的行星,识别出更多这样的行星,以及它们的物理性质,可能有助于辨别一些支配行星形成的物理过程。本文分析了HARPS和ESPEPRESO光谱仪获得的径向速度数据,并报道了探测到的气态巨行星Bebop-1c,它的质量为65.2 ± 11.8 地球质量(M⊕),绕着一个食双星系统的两颗恒星运行,周期为215.5 ± 3.3 天。TOI-1338系统,此后被称为BEBOP-1,它也拥有较小的内凌日行星TOI-1338b,只是第二个被证实的多行星环行双星系统。我们不能仅用径向速度数据来探测TOI-1338b,我们可以99%的置信度将其质量上限定为21.8米⊕。TOI-1338b适用于使用JWST的大气特性,因此BEBOP-1系统有可能成为环行双星大气层外研究的基准。
Circumbinary planets, those that orbit around both stars of a central binary star system, challenge our understanding of planet formation. With only 12 binary systems known to host circumbinary planets, identifying more of these planets, along with their physical properties, could help to discern some of the physical processes that govern planet formation. Here we analyse radial-velocity data obtained by the HARPS and ESPRESSO spectrographs and report the detection of BEBOP-1 c, a gas giant planet with a mass of 65.2 ± 11.8 Earth masses (M⊕) orbiting around both stars of an eclipsing binary star system with a period of 215.5 ± 3.3 days. The system TOI-1338, hereafter referred to as BEBOP-1, which also hosts the smaller and inner transiting planet TOI-1338 b, is only the second confirmed multiplanetary circumbinary system. We do not detect TOI-1338 b with radial-velocity data alone, and we can place an upper limit on its mass of 21.8M⊕with 99% confidence. TOI-1338 b is amenable to atmospheric characterization using JWST, so the BEBOP-1 system has the potential to act as a benchmark for circumbinary exo-atmospheric studies.
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