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arXiv 0912.3202astro-ph.EP
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HARPS搜寻太阳系外的南半球行星。XX。活动恒星周围的行星BD-08:2823

The HARPS search for southern extra-solar planets. XX. Planets around the active star BD-08:2823

G. Hebrard, S. Udry, G. Lo Curto, N. Robichon, D. Naef, D. Ehrenreich, W. Benz, F. Bouchy, A. Lecavelier des Etangs, C. Lovis, M. Mayor, C. Moutou, F. Pepe, D. … 展开作者

G. Hebrard, S. Udry, G. Lo Curto, N. Robichon, D. Naef, D. Ehrenreich, W. Benz, F. Bouchy, A. Lecavelier des Etangs, C. Lovis, M. Mayor, C. Moutou, F. Pepe, D. Queloz, N. C. Santos, D. Segransan

摘要:

我们报告在BD-08:2823周围探测到一个行星系,其中至少包括一颗天王星质量的行星和一颗土星质量的行星。这一发现是在依巴谷测光数据库中搜索行星凌日时偶然发现的。该计划优先选择活跃的恒星,不允许探测新的凌日行星。然而,它允许识别K3 V恒星BD-08:2823作为一个多行星系统的目标,我们在拉西拉的3.6米ESO望远镜上用HARPS光谱仪进行了密集的监测,并对其进行了表征。BD-08:2823的恒星活动水平使分析变得复杂,但并不妨碍在这颗恒星周围发现两颗行星。BD-08:2823 b的最小质量为14.4+/-2.1 M_Earth,轨道周期为5.60天,而BD-08:2823 c的最小质量为0.33+/-0.03 M_Jup,轨道周期为237.6天。这个新系统强化了这样一个事实,即低质量行星优先在多行星系统中发现,而不是在高金属量恒星周围,因为这是大质量行星的情况。它还支持这样一种信念,即在搜索系外行星时不应忽视活跃恒星,即使是在搜索低质量行星时。

英文摘要:

We report the detection of a planetary system around BD-08:2823, that includes at least one Uranus-mass planet and one Saturn-mass planet. This discovery serendipitously originates from a search for planetary transits in the Hipparcos photometry database. This program preferentially selected active stars and did not allow the detection of new transiting planets. It allowed however the identification of the K3V star BD-08:2823 as a target harboring a multiplanet system, that we secured and characterized thanks to an intensive monitoring with the HARPS spectrograph at the 3.6-m ESO telescope in La Silla. The stellar activity level of BD-08:2823 complicates the analysis but does not prohibit the detection of two planets around this star. BD-08:2823b has a minimum mass of 14.4+/-2.1 M_Earth and an orbital period of 5.60 days, whereas BD-08:2823c has a minimum mass of 0.33+/-0.03 M_Jup and an orbital period of 237.6 days. This new system strengthens the fact that low-mass planets are preferentially found in multiplanetary systems, but not around high-metallicity stars as this is the case for massive planets. It also supports the belief that active stars should not be neglected in exoplanet searches, even when searching for low-mass 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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