arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1209.3780astro-ph.EPastro-ph.SR
收藏

β苦长石内碎屑盘的矿物学和结构

The Mineralogy and Structure of the Inner Debris Disk of β Pictoris

Dan Li, Charles M. Telesco, Christopher M. Wright

摘要:

我们在双子座使用T-ReCS观察了β Picardiac的边缘,行星轴承盘,以澄清和扩展以前关于这个独特系统的观察和结论。我们的光谱学和光谱建模的10微米硅酸盐功能约束的空间分布的三个代表性的尘埃成分(0.1微米/2.0微米玻璃橄榄石和结晶镁橄榄石)在内部20 AU的磁盘。我们确认,2.0微米的玻璃橄榄石是强烈的磁盘中心达到峰值,而0.1微米的玻璃橄榄石没有显示这种浓度,而是双峰,与恒星的两侧的峰值。然而,我们没有看到先前研究中报告的这两个峰之间的亮度差异。虽然0.1微米尘埃的空间分布与嵌入盘中的尘埃补充星子带的情况一致,但我们注意到另一种解释,它可以同时解释0.1微米和2.0微米颗粒的空间分布,并且不需要星子带。除了光谱学,我们还获得了β Pic盘的新的11.7微米图像。通过与2003年获得的图像进行比较,我们确认了SW盘中52 AU处尘埃团的存在和整体形状。我们推测,在相隔7年的两个历元之间,该星团的投影空间位移约为2.0 AU(3.6-σ),这是由于该星团在$54.3^{+2.0}_{-1.2}$ AU轨道半径处的开普勒运动所致。

英文摘要:

We observed the edge-on, planet-bearing disk of β Pictoris using T-ReCS at Gemini to clarify and extend previous observations and conclusions about this unique system. Our spectroscopy and spectral modeling of the 10-micron silicate feature constrain the spatial distributions of three representative dust components (0.1-micron/2.0-micron glassy olivine and crystalline forsterite) across the inner 20-AU of the disk. We confirm that the 2.0-micron glassy olivine is strongly peaked in the disk center and that the 0.1-micron glassy olivine does not show this concentration, but rather is double peaked, with the peaks on either side of the star. However, we do not see the strong difference in brightness between those two peaks reported in a previous study. Although the spatial distribution of the 0.1-micron dust is consistent with the scenario of a dust-replenishing planetesimal belt embedded in the disk, we note an alternative interpretation that can explain the spatial distributions of the 0.1-micron and 2.0-micron grains simultaneously and does not require the planetesimal belt. In addition to the spectroscopy, we also obtained a new 11.7 micron image of the β Pic disk. By comparing this image with that acquired in 2003, we confirm the existence and overall shape of the dusty clump at 52 AU in the SW disk. We speculate that the clump's projected spatial displacement of ~2.0 AU, a 3.6-σ result, between two epochs separated by seven years is due to the Keplerian motion of the clump at an orbital radius of $54.3^{+2.0}_{-1.2}$ AU.

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。

↑