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arXiv 2307.13622astro-ph.EP
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两颗距离最近的类木行星的修订轨道

Revised orbits of the two nearest Jupiters

Fabo Feng, R. Paul Butler, Steven S. Vogt, Bradford Holden, Yicheng Rui

AI总结:

本研究开发基于GOST的方法,联合视向速度与多版本Gaia数据,修订了两颗最近冷类木行星ε Ind A b、ε Eridani b的轨道与质量参数,验证了多Gaia数据版本约束类木行星的可行性。

摘要:

凭借近红外到中红外的高对比度成像能力,JWST(詹姆斯·韦布空间望远镜)正引领我们进入直接成像类木行星的黄金时代。作为两颗距离最近的冷类木行星,ε Ind A b和ε Eridani b拥有足够宽的轨道和充足的红外辐射,可被JWST探测到。为了探测更多可供直接成像的类木行星,我们开发了一种基于GOST的方法,可同时分析视向速度数据与多个Gaia(盖亚)数据发布版本。该方法无需用星表天体测量值近似瞬时天体测量值,能够利用多个Gaia数据发布版本同时探测短周期和长周期行星。我们测定ε Ind A b的质量为$2.96_{-0.38}^{+0.41}$ $M_{\rm Jup}$(木星质量),轨道周期为$42.92_{-4.09}^{+6.38}$年。我们还测得ε Eridani b的质量为$0.76_{-0.11}^{+0.14}$ $M_{\rm Jup}$,轨道周期为$7.36_{-0.05}^{+0.04}$年,偏心率为0.26$_{-0.04}^{+0.04}$。其偏心率与部分先前研究给出的结果存在差异,可能是因为轨道偏心率对噪声建模较为敏感。本工作细化了对这两颗最近类木行星的轨道与质量约束,并证明了利用多个Gaia数据发布版本约束类木行星的可行性。

英文摘要:

With its near-to-mid-infrared high contrast imaging capabilities, JWST is ushering us into a golden age of directly imaging Jupiter-like planets. As the two closest cold Jupiters, $\varepsilon$ Ind A b and $\varepsilon$ Eridani b have sufficiently wide orbits and adequate infrared emissions to be detected by JWST. To detect more Jupiter-like planets for direct imaging, we develop a GOST-based method to analyze radial velocity data and multiple Gaia data releases simultaneously. Without approximating instantaneous astrometry by catalog astrometry, this approach enables the use of multiple Gaia data releases for detection of both short-period and long-period planets. We determine a mass of $2.96_{-0.38}^{+0.41}$ $M_{\rm Jup}$ and a period of $42.92_{-4.09}^{+6.38}$ yr for $\varepsilon$ Ind A b. We also find a mass of $0.76_{-0.11}^{+0.14}$ $M_{\rm Jup}$, a period of $7.36_{-0.05}^{+0.04}$ yr, and an eccentricity of 0.26$_{-0.04}^{+0.04}$ for $\varepsilon$ Eridani b. The eccentricity differs from that given by some previous solutions probably due to the sensitivity of orbital eccentricity to noise modeling. Our work refines the constraints on orbits and masses of the two nearest Jupiters and demonstrate the feasibility of using multiple Gaia data releases to constrain Jupiter-like planets.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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