论文标题
赫歇尔对圆盘围绕晚期星星的观察
Herschel Observations of Disks around Late-type Stars
论文作者
论文摘要
在100和160微米的Herschel空间天文台观察到一组二十种晚期（K5-M5）恒星，目的是寻找远红外的过剩，以表明存在情节磁盘。在该样品中，四颗恒星（TYC 7443-1102-1，TYC 9340-437-1，GJ 784和GJ 707）在其出色的光电指针上以100或160微米或两者兼而有之。在100微米，TYC 9340-437-1在空间上以一种表明它被面对面磁盘包围的形状解决。与GJ 707相关的100微米多余的通量在3sigma左右。与GJ 784相关的多余通量很可能是由于背景星系所致，因为从光谱能量拟合中估算出的尘埃半径意味着任何相关的灰尘磁盘都应在赫歇尔图像中解决，但不是。 Alma观察到TYC 7443-1102-1，该ALMA在其位置将发射分解为两个不同的来源，使得Herschel多余也很可能也是由于背景星系所致。值得注意的是，这颗恒星位于23 Myr Old Beta Pic Association中。该系统具有10^-3 l*的磁盘发光度，是高对比度成像和ALMA的理想后续目标。
A set of twenty late-type (K5-M5) stars were observed with the Herschel Space Observatory at 100 and 160 microns with the goal of searching for far-infrared excesses indicative of the presence of circumstellar disks. Out of this sample, four stars (TYC 7443-1102-1, TYC 9340-437-1, GJ 784 and GJ 707) have infrared excesses above their stellar photospheres at either 100 or 160 micron or both. At 100 microns TYC 9340-437-1 is spatially resolved with a shape that suggests it is surrounded by a face-on disk. The 100 micron excess flux associated with GJ 707 is marginal at around 3sigma. The excess flux associated with GJ 784 is most likely due to a background galaxy as the dust radius estimated from the spectral energy fit implies that any associated dust disk should have been resolved in the Herschel images but is not. TYC 7443-1102-1 has been observed with ALMA which resolves the emission at its location into two distinct sources making the Herschel excess most likely also due to a background galaxy. It is worth noting that this star is in the 23 Myr old beta Pic association. With a disk luminosity on the order of 10^-3 L*, this system is an ideal follow-up target for high-contrast imaging and ALMA.
