arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2103.00568astro-ph.EPastro-ph.SR
收藏

来自ALLWISE目录的温暖极端碎片盘的新样本

A new sample of warm extreme debris disks from the ALLWISE catalog

Attila Moór, Péter Ábrahám, Gyula Szabó, Krisztián Vida, Gianni Cataldi, Alíz Derekas, Thomas Henning, Karen Kinemuchi, Ágnes Kóspál, József Kovács, András Pál,… 展开作者

Attila Moór, Péter Ábrahám, Gyula Szabó, Krisztián Vida, Gianni Cataldi, Alíz Derekas, Thomas Henning, Karen Kinemuchi, Ágnes Kóspál, József Kovács, András Pál, Paula Sarkis, Bálint Seli, Zsófia M. Szabó, Katalin Takáts

摘要:

极端碎片盘(EDD)是罕见的具有特别大量的温暖尘埃的系统,这些尘埃可能源于最近在类地行星生长的最后阶段行星胚胎之间的巨大撞击。在这里,我们报告六个新的EDD的识别和表征。这些盘围绕着年龄大于1亿年的F5-G9型主序星,尘埃温度高于300 K,光度分数在0.01到0.07之间。使用WISE全天巡天3.4和4.6 $μ$ m处的时域光度数据,我们得出结论,其中四个圆盘在2010年至2019年期间表现出可变的中红外发射。分析所有已知EDD的样本,现在扩展到17个对象,我们发现其中14个在过去十年中在3-5 $μ$ m处显示出变化,这表明中红外变化是EDD的固有特征。我们还报告说,宽轨道对显着更常见的EDD系统比在正常的恒星星族。虽然目前的岩石行星形成模型预测,大多数的巨大碰撞发生在第一个100万年,我们发现,EDD的样本是由系统的年龄超过这个年龄。这就提出了一种可能性,即巨大撞击的时代可能比我们想象的要长,或者其他一些机制也可以产生EDD。我们研究的情况下,所观察到的温暖的尘埃源于从外部水库到内部地区的彗星的破坏和/或碰撞,并探讨在这个过程中广泛的同伴可以发挥什么作用。

英文摘要:

Extreme debris disks (EDDs) are rare systems with peculiarly large amounts of warm dust that may stem from recent giant impacts between planetary embryos during the final phases of terrestrial planet growth. Here we report on the identification and characterization of six new EDDs. These disks surround F5-G9 type main-sequence stars with ages >100 Myr, have dust temperatures higher than 300K and fractional luminosities between 0.01 and 0.07. Using time-domain photometric data at 3.4 and 4.6$μ$m from the WISE all sky surveys, we conclude that four of these disks exhibited variable mid-infrared emission between 2010 and 2019. Analyzing the sample of all known EDDs, now expanded to 17 objects, we find that 14 of them showed changes at 3-5$μ$m over the past decade suggesting that mid-infrared variability is an inherent characteristic of EDDs. We also report that wide-orbit pairs are significantly more common in EDD systems than in the normal stellar population. While current models of rocky planet formation predict that the majority of giant collisions occur in the first 100 Myr, we find that the sample of EDDs is dominated by systems older than this age. This raises the possibility that the era of giant impacts may be longer than we think, or that some other mechanism(s) can also produce EDDs. We examine a scenario where the observed warm dust stems from the disruption and/or collisions of comets delivered from an outer reservoir into the inner regions, and explore what role the wide companions could play in this process.

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。

↑