$WISE$全天巡天$\cap$ SDSS中的尘埃WD
Dusty WDs in the $WISE$ All Sky Survey $\cap$ SDSS
摘要：
Debes等人（2011年）最近在SDSS DR 7白矮星目录与宽视场红外巡天探测器（$WISE$）3.4、4.6、12和22微米全天空测光之间进行了交叉相关，发现了52颗候选尘埃白矮星（WD）。然而，6“$WISE$光束考虑到这些WD所表现出的许多过量可能是由于附近源的污染造成的。我们提出了MMT $+$ SWIRC $J$ -和$H$ -波段成像观测（0.5- 1.5“PSF）的16个这些候选尘埃WD，并确认四个光谱能量分布（SED）与尘埃盘一致，并没有伴随着附近的污染源。其余12个WD污染了$WISE$光度测量，当光度测量中不包括污染源时，SED与灰尘盘不一致。我们发现在$WISE$ $\cap$ SDSS样本中单个WD周围的盘的频率为2.6- 4.1%。四个新的尘埃WD之一的质量为$1.04 M_{\odot}$（祖质量$5.4 M_{\odot}$），它的发现首次证实了大质量WD（及其大质量祖星）拥有行星系统。
英文摘要：
A recent cross-correlation between the SDSS DR7 White Dwarf Catalog with the Wide-Field Infrared Survey Explorer ($WISE$) all-sky photometry at 3.4, 4.6, 12, and 22 microns performed by Debes et al. (2011) resulted in the discovery of 52 candidate dusty white dwarfs (WDs). The 6'' $WISE$ beam allows for the possibility that many of the excesses exhibited by these WDs may be due to contamination from a nearby source, however. We present MMT$+$SWIRC $J$- and $H$-band imaging observations (0.5-1.5'' PSF) of 16 of these candidate dusty WDs and confirm that four have spectral energy distributions (SEDs) consistent with a dusty disk and are not accompanied by a nearby source contaminant. The remaining 12 WDs have contaminated $WISE$ photometry and SEDs inconsistent with a dusty disk when the contaminating sources are not included in the photometry measurements. We find the frequency of disks around single WDs in the $WISE$ $\cap$ SDSS sample to be 2.6-4.1%. One of the four new dusty WDs has a mass of $1.04 M_{\odot}$ (progenitor mass $5.4 M_{\odot}$) and its discovery offers the first confirmation that massive WDs (and their massive progenitor stars) host planetary systems.
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