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arXiv 2306.04420astro-ph.EPastro-ph.SR
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HARPS南天太阳系外行星搜寻。XLVII. 五颗长周期轨道木星质量行星、一颗强辐照海王星、一颗褐矮星以及五个恒星双星系统

The HARPS search for southern extra-solar planets. XLVII. Five Jupiter-mass planets in long-period orbits, one highly irradiated Neptune, one brown dwarf, and five stellar binaries

Y. G. C. Frensch, G. Lo Curto, F. Bouchy, M. Mayor, G. Hébrard, C. Lovis, C. Moutou, F. A. Pepe, D. Queloz, N. Santos, D. Segransan, S. Udry, N. Unger

备注：
22 pages, 32 figures, accepted for publication in A&A
发表信息：
A&A 675, A173 (2023)
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AI总结：

本研究利用HARPS的视向速度数据结合依巴谷、盖亚的天体测量数据，在南天主序星周围发现多颗长周期系外行星、褐矮星及恒星双星系统，并明确了部分天体的真实质量与轨道参数。

摘要：

我们的研究目标是探测并表征主序星（光谱型为晚F型至早M型）周围的长周期伴星。我们采用视向速度（RV）法搜寻恒星周围的系外行星，视向速度变化通过欧洲南方天文台（ESO）3.6米望远镜搭载的HARPS（高精度径向速度行星搜索器）进行测量。对于质量较大的伴星，我们通过天体测量学获取其真实质量和轨道倾角，天体测量数据来自Hipparcos（依巴谷卫星）和Gaia（盖亚卫星）的自行测量结果。\n研究公布了五颗木星质量系外行星，它们分别围绕HIP54597、BD-210397（2颗）、HD74698和HD94771运行，轨道周期分别为8.9年、5.2年、17.4年、9.4年和5.9年，最小质量分别为$2.01 \pm 0.03$、$0.7 \pm 0.1$、$2.4^{+1.5}_{-0.2}$、$0.40 \pm 0.06$和$0.53 \pm 0.03 M_J$（木星质量）。HD74698还拥有一颗处于15天轨道上的强辐照海王星，其最小质量为$0.07 \pm 0.01 M_J$。\n天体测量结果显示，HIP54597 b的质量最多可增加10%-30%，HD74698 c的最小质量很可能等于其真实质量，BD-210397 c的质量为$2.66^{+0.63}_{-0.32} M_J$。HD62364拥有一颗褐矮星，真实质量为$18.77^{+0.66}_{-0.63} M_J$，轨道周期为14年。HD56380B、HD221638B和HD33473C的最小质量处于褐矮星质量范围内，轨道周期分别为8.9年、16.6年和50年；但天体测量结果表明它们实际是恒星双星系统，质量分别为$375.3^{+8.6}_{-8.4}$、$110.0^{+3.9}_{-3.7}$和$271.0^{+3.9}_{-3.8} M_J$。\n恒星双星系统HD11938和HD61383的轨道尚未完整测定。HD61383的初步结果为：拥有一颗0.190 $M_{\odot}$（太阳质量）的伴星，轨道周期39年。HD11938双星系统的伴星质量为0.33 $M_{\odot}$——该结果已通过互相关函数（CCF）的次级峰证实——初步轨道周期为35年。HD3964的3.0年视向速度信号来源尚不明确，因为该信号与恒星的磁活动周期存在耦合。最后我们还公布了另一颗恒星HD11608，其磁活动周期会产生类似行星信号的假象。

英文摘要：

Our aim is to detect and characterise long-period companions around main sequence stars (spectral types late F to early M). We use the RV method to search for exoplanets around stars. The RV variations are measured with HARPS at the ESO 3.6 metre telescope. The true mass and inclination of our heavier companions are provided by astrometry, for which we use proper motions from Hipparcos and Gaia. Five Jupiter-mass exoplanets are reported to orbit HIP54597, BD-210397 (x2), HD74698, and HD94771 with 8.9 yr, 5.2 yr, 17.4 yr, 9.4 yr, and 5.9 yr orbits, and to have minimum masses of $2.01 \pm 0.03$, $0.7 \pm 0.1$, $2.4^{+1.5}_{-0.2}$, $0.40 \pm 0.06$, and $0.53 \pm 0.03 M_J$ respectively. HD74698 also hosts a highly irradiated Neptune in a 15 day orbit with a minimum mass of $0.07 \pm 0.01 M_J$. The mass of HIP54597 b can maximally increase by 10% - 30%, the minimum mass of HD74698 c is likely equal to its true mass, and BD-210397 c has a mass of $2.66^{+0.63}_{-0.32} M_J$. HD62364 hosts a brown dwarf with a true mass of $18.77^{+0.66}_{-0.63} M_J$ in an orbit of 14 yr. HD56380B, HD221638B, and HD33473C have minimum masses within the brown dwarf limits, in orbits of 8.9 yr, 16.6 yr, and 50 yr respectively; however, astrometric measurements reveal them to be stellar binaries, with masses of $375.3^{+8.6}_{-8.4}$, $110.0^{+3.9}_{-3.7}$, and $271.0^{+3.9}_{-3.8} M_J$. The orbits of the stellar binaries HD11938 and HD61383 are incomplete. The preliminary result for HD61383 is a 0.190 $M_{\odot}$ binary in a 39 yr orbit. The secondary of the binary system HD11938 has a mass of 0.33 $M_{\odot}$ - which is confirmed by a secondary peak in the CCF - and a preliminary period of 35 yr. The origin of the 3.0 yr RV signal of HD3964 is uncertain as it shows entanglement with the magnetic cycle of the star. We finally report one more star, HD11608, with a magnetic cycle that mimics a planetary signal.

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