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arXiv 0712.0378astro-ph
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发现F2V恒星HD 15745周围的扩展碎片盘

Discovery of an extended debris disk around the F2V star HD 15745

Paul Kalas, Gaspard Duchene, Michael P. Fitzgerald, James R. Graham

摘要:

利用哈勃太空望远镜上的高级巡天相机,我们发现了F2 V恒星HD 15745周围碎片盘的尘埃散射光。拱星盘的半径在2.0”到7.5”之间,相当于128 - 480 AU。星周盘形态关于恒星不对称,类似于风扇,并且与光学薄盘中向前散射的颗粒一致,与我们的视线倾斜约67度。光谱能量分布和散射光的形态可以用一个由半径在60和450 AU之间的硅酸盐颗粒组成的模型盘来近似,总尘埃质量为10 E-7 M_sun(0.03 M_earth),代表窄的粒度分布(1 - 10微米)。银河系的空间运动类似于蓖麻移动群,年龄约为10 E +8年,尽管未来的工作需要使用其他指标来确定HD 15745的年龄。

英文摘要:

Using the Advanced Camera for Surveys aboard the Hubble Space Telescope, we have discovered dust-scattered light from the debris disk surrounding the F2V star HD 15745. The circumstellar disk is detected between 2.0" and 7.5" radius, corresponding to 128 - 480 AU radius. The circumstellar disk morphology is asymmetric about the star, resembling a fan, and consistent with forward scattering grains in an optically thin disk with an inclination of ~67 degrees to our line of sight. The spectral energy distribution and scattered light morphology can be approximated with a model disk composed of silicate grains between 60 and 450 AU radius, with a total dust mass of 10E-7 M_sun (0.03 M_earth) representing a narrow grain size distribution (1 - 10 micron). Galactic space motions are similar to the Castor Moving Group with an age of ~10E+8 yr, although future work is required to determine the age of HD 15745 using other indicators.

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