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arXiv 2104.13396astro-ph.EP
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M矮星北落师门C的碎片盘的ALMA成像

ALMA imaging of the M-dwarf Fomalhaut C's debris disc

Patrick F. Cronin-Coltsmann, Grant M. Kennedy, Paul Kalas, Julien Milli, Cathie J. Clarke, Gaspard Duchêne, Jane Greaves, Samantha M. Lawler, Jean-François Lest… 展开作者

Patrick F. Cronin-Coltsmann, Grant M. Kennedy, Paul Kalas, Julien Milli, Cathie J. Clarke, Gaspard Duchêne, Jane Greaves, Samantha M. Lawler, Jean-François Lestrade, Brenda C. Matthews, Andrew Shannon, Mark C. Wyatt

摘要:

北落师门C(LP 876-10)是一颗低质量的M4 V恒星,位于有趣的北落师门三重星系中,和北落师门A一样,拥有一个碎片盘。它是已知为数不多的拥有碎片盘的M矮星之一,并且是迄今为止质量最小的M矮星。我们提出了新的解决观测北落师门C周围的碎片盘与阿塔卡马大型毫米阵列,使我们能够模拟其属性和调查系统的独特历史。该环的半径为26 AU,半高宽最多为4.2 AU。我们发现一个3 $σ$的离心率上限为0.14,既不确认也不排除以前的动力学相互作用与北落师门A,可能会影响北落师门C的光盘。我们在系统中没有检测到$^{12}$ CO J=3-2发射,并且在使用HST/STIS或VLT/SPHERE的散射光中没有检测到盘。我们发现原来的Herschel检测与我们的ALMA模型的径向尺寸是一致的。我们把光盘的背景下,更广泛的碎片光盘人口,并发现其半径是预期从以前的光盘半径主机光度的趋势。需要对该系统进行更高信噪比的观测,以进一步限制盘的性质,并为整个北落师门三重系统的历史提供进一步的见解。

英文摘要:

Fomalhaut C (LP 876-10) is a low mass M4V star in the intriguing Fomalhaut triple system and, like Fomalhaut A, possesses a debris disc. It is one of very few nearby M-dwarfs known to host a debris disc and of these has by far the lowest stellar mass. We present new resolved observations of the debris disc around Fomalhaut C with the Atacama Large Millimetre Array which allow us to model its properties and investigate the system's unique history. The ring has a radius of 26 au and a narrow full width at half maximum of at most 4.2 au. We find a 3$σ$ upper limit on the eccentricity of 0.14, neither confirming nor ruling out previous dynamic interactions with Fomalhaut A that could have affected Fomalhaut C's disc. We detect no $^{12}$CO J=3-2 emission in the system and do not detect the disc in scattered light with HST/STIS or VLT/SPHERE. We find the original Herschel detection to be consistent with our ALMA model's radial size. We place the disc in the context of the wider debris disc population and find that its radius is as expected from previous disc radius-host luminosity trends. Higher signal-to-noise observations of the system would be required to further constrain the disc properties and provide further insight to the history of the Fomalhaut triple system as a whole.

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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