论文标题
二进制和磁盘：美女与JWST一起在NGC3132中找到
The binary and the disk: the beauty is found within NGC3132 with JWST
论文作者
论文摘要
行星星云（PN）NGC3132是一个引人注目但鲜为人知的，大规模损失现象的一个醒目的例子，该现象（1-8）Msun星星在死亡中发生的时（WDS）演变成死亡（WDS）。通过对NGC3132的JWST多波长（0.9-18微米）成像的分析，我们报告了NGC3132的WD中心星（CS）周围的不对称尘埃云的发现，在18 micron〜图像中最为突出，表面闪光有限的rADIAL范围有限> 〜2 arcsec。我们表明，通过检测这些恒星在〜20年以上这些恒星之间（0.24 +/- 0.045）度（0.24 +/- 0.045）度（0.24 +/- 0.045）度，A2V恒星位于1.7 ARCSEC至CS向北（距地球0.75 kpc）是重力绑定到后者的重力。使用从JWST图像中提取的CS的孔径光度法，以及已发表的光学光度法和档案紫外线光谱，我们构建了CS的光谱 - 能源分布（SED）及其在紫外线对MID-IR（0.091-18微米）范围内的扩展发射。我们发现，将CS的SED和径向强度分布拟合为7.7、12.8和18微米，并从灰尘中进行热发射，需要云延伸至> 〜1785 AU的半径，灰尘质量为〜1.3 x 10^（-2）m（-2）m（ - 2）m（地球），晶粒为70％硅酸盐和30％的硅酸盐和30％的无脑碳。我们提出了尘埃云的合理起源和进化场景，其中三颗恒星（CS，接近质量的伴侣和更遥远的A2V星）组成了一个稳定的层次三重系统，在主序列上，但后来动态不稳定，形成了当前的质谱质量式的质量式质量式，从而形成了当前的倍极。
The planetary nebula (PN) NGC3132 is a striking example of the dramatic but poorly understood, mass-loss phenomena that (1-8) Msun stars undergo during their death throes as they evolve into white dwarfs (WDs). From an analysis of JWST multiwavelength (0.9-18 micron) imaging of NGC3132, we report the discovery of an asymmetrical dust cloud around the WD central star (CS) of NGC3132, seen most prominently in the 18 micron~image, with a surface-brightness limited radial extent of >~2 arcsec. We show that the A2V star located 1.7 arcsec to CS's North-East (and 0.75 kpc from Earth) is gravitationally-bound to the latter, by the detection of relative orbital angular motion of (0.24+/-0.045) deg between these stars over ~20 yr. Using aperture photometry of the CS extracted from the JWST images, together with published optical photometry and an archival UV spectrum, we have constructed the spectral-energy distribution (SED) of the CS and its extended emission over the UV to mid-IR (0.091-18 micron) range. We find that fitting the SED of the CS and the radial intensity distributions at 7.7, 12.8 and 18 micron with thermal emission from dust requires a cloud that extends to a radius of >~1785 au, with a dust mass of ~1.3 x 10^(-2) M(Earth) and grains that are 70% silicate and 30% amorphous carbon. We propose plausible origins of the dust cloud and an evolutionary scenario in which a system of three stars -- the CS, a close low-mass companion, and a more distant A2V star -- forms a stable hierarchical triple system on the main-sequence but becomes dynamically unstable later, resulting in the spectacular mass-ejections that form the current, multipolar PN.
