Discovery of the Fomalhaut C debris disc
Discovery of the Fomalhaut C debris disc
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发现北落师门 C 碎片盘
DOI：
10.1093/mnrasl/slt168
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发表时间：
2013
影响因子：
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通讯作者：
J. Greaves
中科院分区：
文献类型：
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作者：
G. Kennedy;M. Wyatt;P. Kalas;G. Duchêne;B. Sibthorpe;J. Lestrade;B. Matthews;J. Greaves
北落星门是附近最有趣和最受研究的恒星之一，拥有至少一颗行星、一个壮观的碎片环和两个遥远的低质量恒星伴星(TWPSA和LP876−10，又名)。南北亚门B和C)。我们用赫歇尔观测到了这两个伴星，虽然在次要的TWPSA周围没有探测到盘，但我们在南落户星系中发现了第二个碎片盘，大约在LP876−10。这次探测只是在多个系统中看到的两个碎片盘的第二个例子，这两个碎片盘都相对较宽(HD 223352/40为3000Au，Fomalhaut/LP 876−10为158kau[0.77pC])。该星系盘温度较低(24K)，亮度相对较亮，光度分数LDisc/L�=1.2×10−4，代表了在M矮星周围罕见地观测到的碎片盘。进一步的工作应该试图找出在北落户星系中存在两个圆盘是否是巧合，可能仅仅是因为相对较年轻的440Myr的系统年龄，或者是否恒星组件已经动态地相互作用，该系统甚至比现在看起来更复杂。
Fomalhaut is one of the most interesting and well-studied nearby stars, hosting at least one planet, a spectacular debris ring and two distant low-mass stellar companions (TW PsA and LP 876−10, a.k.a. Fomalhaut B and C). We observed both companions with Herschel, and while no disc was detected around the secondary, TW PsA, we have discovered the second debris disc in the Fomalhaut system, around LP 876−10. This detection is only the second case of two debris discs seen in a multiple system, both of which are relatively wide (3000 au for HD 223352/40 and 158 kau [0.77 pc] for Fomalhaut/LP 876−10). The disc is cool (24 K) and relatively bright, with a fractional luminosity Ldisc/L� = 1.2 × 10 −4 , and represents the rare observation of a debris disc around an M dwarf. Further work should attempt to find if the presence of two discs in the Fomalhaut system is coincidental, perhaps simply due to the relatively young system age of 440 Myr, or if the stellar components have dynamically interacted and the system is even more complex than it currently appears.