HUBBLE SPACE TELESCOPE OBSERVATIONS OF THE HD 202628 DEBRIS DISK
HUBBLE SPACE TELESCOPE OBSERVATIONS OF THE HD 202628 DEBRIS DISK
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哈勃太空望远镜对 HD 202628 碎片盘的观测
DOI：
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发表时间：
2012
期刊：
影响因子：
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通讯作者：
P. Plavchan
中科院分区：
文献类型：
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作者：
J. Krist;K. Stapelfeldt;G. Bryden;P. Plavchan
G2 V星星HD 202628（d = 24.4 pc）周围的环形碎片盘在可见光波段的散射光下使用哈勃太空望远镜上的太空望远镜成像光谱仪的日冕模式成像。根据表观长轴/短轴比，环从正面倾斜64°，长轴沿沿着P.A.对齐。= 130°。它的内外半径（>50%最大表面亮度）在西北部为139 Au和193 Au，在东南部为161 Au和223 Au（Δr/r = 0.4）。最大可见半径范围为254 Au。平均表面亮度为V 24 mag arcsec−2，是迄今为止在反射光下观测到的最暗的碎片盘。环的中心似乎偏离了星星28个Au（反投影）。拟合到内边缘的椭圆具有0.18的偏心率和a = 158 Au。这种偏移，沿着相对尖锐的环内边缘，暗示着一个行星质量的伴星的影响。HD 202628与北落师门周围的碎片环非常相似，但它是一颗更成熟的星星，估计年龄约为2 Gyr。在我们的研究中，我们还提供了其他九颗恒星的表面亮度极限，这些恒星具有强烈的斯皮策过度，在散射光中没有检测到碎片盘（HD 377，HD 7590，HD 38858，HD 45184，HD 73350，HD 135599，HD 145229，HD 187897和HD 201219）。
A ring-shaped debris disk around the G2V star HD 202628 (d = 24.4 pc) was imaged in scattered light at visible wavelengths using the coronagraphic mode of the Space Telescope Imaging Spectrograph on the Hubble Space Telescope. The ring is inclined by ∼64° from face-on, based on the apparent major/minor axis ratio, with the major axis aligned along P.A. = 130°. It has inner and outer radii (>50% maximum surface brightness) of 139 AU and 193 AU in the northwest ansae and 161 AU and 223 AU in the southeast (Δr/r ≈ 0.4). The maximum visible radial extent is ∼254 AU. With mean surface brightness of V ≈ 24 mag arcsec−2, this is the faintest debris disk observed to date in reflected light. The center of the ring appears offset from the star by ∼28 AU (deprojected). An ellipse fit to the inner edge has an eccentricity of 0.18 and a = 158 AU. This offset, along with the relatively sharp inner edge of the ring, suggests the influence of a planetary-mass companion. There is a strong similarity with the debris ring around Fomalhaut, though HD 202628 is a more mature star with an estimated age of about 2 Gyr. We also provide surface brightness limits for nine other stars in our study with strong Spitzer excesses around which no debris disks were detected in scattered light (HD 377, HD 7590, HD 38858, HD 45184, HD 73350, HD 135599, HD 145229, HD 187897, and HD 201219).