论文标题
使用ALMA(ODISEA)的Ophiuchus Disc调查。 ii。恒星多样性对光盘属性的影响
The Ophiuchus DIsc Survey Employing ALMA (ODISEA). II. The effect of stellar multiplicity on disc properties
论文作者
论文摘要
我们使用ODISEA目标的VLT/NACO和KECK/NIRC2进行了自适应光学器件(AO)。 Odisea是对Ophiuchus分子云中整个情节椎间盘的整个群体的ALMA调查。从整个ODISEA样品中,我们选择了在NIR中使用AO观察到的所有圆盘,并且可以使用NACO或NIRC2观察。 NIR-ODISEA调查是第一次在NIR AO成像中观察到的147颗恒星,以及文献中几乎所有存在的Ophiuchus的二元系统(21分中的20个)。我们总共检测到20个新的二元系统和一个三重系统。对于每个人,我们计算出伴侣的投影分离和位置角,以及它们的NIR和毫米通量比。从NIR的对比中,我们得出了次要的质量,发现其中9个处于子策略状态(30-50 \ mjup)。多个系统中的光盘达到$ \ sim $ 50 m $ _ {\ oplus} $的最大总灰尘质量,而单星的光盘可以达到200 m $ _ {\ oplus} $的灰尘质量。仅在10 m $ _ {\ oplus} $的块的圆盘上发现,在二进制文件周围只发现了大于$ \ sim $ 110 au的二进制文件。单星周围的最大圆盘尺寸也大于二进制。但是,由于奥菲丘斯(Ophiuchus)中的大多数椎间盘非常小且低质量,因此视觉二进制的效果在一般盘中相对较弱。
We present Adaptive Optics (AO) near infrared (NIR) observations using VLT/NACO and Keck/NIRC2 of ODISEA targets. ODISEA is an ALMA survey of the entire population of circumstellar discs in the Ophiuchus molecular cloud. From the whole sample of ODISEA we select all the discs that are not already observed in the NIR with AO and that are observable with NACO or NIRC2. The NIR-ODISEA survey consists of 147 stars observed in NIR AO imaging for the first time, as well as revisiting almost all the binary systems of Ophiuchus present in the literature (20 out of 21). In total, we detect 20 new binary systems and one triple system. For each of them we calculate the projected separation and position angle of the companion, as well as their NIR and millimeter flux ratios. From the NIR contrast we derived the masses of the secondaries, finding that 9 of them are in the sub-stellar regime (30-50 \MJup). Discs in multiple systems reach a maximum total dust mass of $\sim$ 50 M$_{\oplus}$, while discs in single stars can reach a dust mass of 200 M$_{\oplus}$. Discs with masses above 10 M$_{\oplus}$ are found only around binaries with projected separations larger than $\sim$ 110 au. The maximum disc size is also larger around single star than binaries. However, since most discs in Ophiuchus are very small and low-mass, the effect of visual binaries is relatively weak in the general disc population.