论文标题
Carina Young协会的年龄和HD 95086的潜在成员资格
The Age of the Carina Young Association and Potential Membership of HD 95086
论文作者
论文摘要
Carina是附近的年轻恒星协会。到目前为止，只有少数恒星被清楚地确定为该协会的成员。在本文中，我们根据Gaia DR2数据重新分析了协会的成员资格，特别是发现HD 95086是潜在的成员（概率为71％）。这颗恒星值得注意，因为既有检测到的碎屑盘和直接成像的行星的少数恒星之一。以前，它仅被认为是Scorpius -Centaurus协会的一部分的下半人马座Crux（LCC）的潜在成员。我们还重新分析了Carina协会的年龄。使用适用于Carina最可能（> 99％）成员的恒星进化模型的贝叶斯推理代码，我们推断出13.3 $^{+1.1} _ { - 0.6} $ MYR的关联年龄，比以前的研究年轻得多。尽管我们已经修订了HD 95086的协会会员从LCC到Carina，但我们还发现Carina的年龄与LCC相似，这一事实意味着HD 95086B质量的估计值保持不变。然而，年轻的卡琳（Carina）的年龄确实意味着另一个Carina成员HD 44627（或AB PIC）的同伴的质量更清楚地在地球上而不是棕色矮人范围。
Carina is a nearby young stellar association. So far, only a small number of stars have been clearly identified as members of this association. In this paper we reanalyse the membership of the association in light of Gaia DR2 data, in particular finding that HD 95086 is a potential member (probability of 71%). This star is noteworthy as one of the few stars that hosts both a detected debris disc and a directly imaged planet. It has previously only been considered as a potential member of the Lower Centaurus Crux (LCC) - part of the Scorpius-Centaurus association. We also reanalyse the age of the Carina association. Using a Bayesian inference code applied to infer a solution from stellar evolution models for the most probable (>99%) members of Carina, we infer an age for the association of 13.3$^{+1.1}_{-0.6}$ Myr, much younger than previous studies. Whilst we have revised HD 95086's association membership from LCC to Carina, the fact that we also find Carina to have a younger age, similar to that of LCC, means that the estimates of HD 95086b's mass remain unchanged. However, the younger age of Carina does mean that the companion to another Carina member, HD 44627 (or AB Pic), has a mass that is more clearly in the planet rather than brown dwarf range.
