ALMA and Herschel observations of the prototype dusty and polluted white dwarf G29-38
ALMA and Herschel observations of the prototype dusty and polluted white dwarf G29-38
复制标题
ALMA 和赫歇尔对原型尘埃和污染白矮星 G29-38 的观测
DOI：
10.1093/mnras/stu1545
复制
发表时间：
2014
影响因子：
4.8
通讯作者：
Farihi J
中科院分区：
文献类型：
--
作者：
Farihi J
阿尔马周期0和赫歇尔PACS观测报告的原型，最近的，最明亮的例子，一个尘埃和污染的白色矮星，G29-38。这些长波长方案试图探测1-100 Au的外围母体，从中产生了在0.01 Au范围内观察到的破裂的星子碎片，其LIR/L*= 0.039。在LIR/L* 10−4以下的任何数据中都没有检测到相关的发射源，一般排除了大于1024- 1025克的冷尘埃质量，以获得合理的颗粒大小和轨道区域的性质，对应于小行星和柯伊伯带类似物的演化版本。总的来说，这些零检测与星子盘长期碰撞演化的模型一致，并且像G29-38这样的恒星被破坏的母体的源区可能只在特殊情况下才突出，例如最近的不稳定性。一个更大的污染白色矮星样本，与完整的阿尔马阵列的目标，有可能明确地确定其行星碎片的母源。
ALMA Cycle 0 andHerschelPACS observations are reported for the prototype, nearest, and brightest example of a dusty and polluted white dwarf, G29-38. These long-wavelength programmes attempted to detect an outlying, parent population of bodies at 1–100 au, from which originates the disrupted planetesimal debris that is observed within 0.01 au and which exhibitsLIR/L*= 0.039. No associated emission sources were detected in any of the data down toLIR/L*∼ 10−4, generally ruling out cold dust masses greater than 1024–1025g for reasonable grain sizes and properties in orbital regions corresponding to evolved versions of both asteroid and Kuiper belt analogues. Overall, these null detections are consistent with models of long-term collisional evolution in planetesimal discs, and the source regions for the disrupted parent bodies at stars like G29-38 may only be salient in exceptional circumstances, such as a recent instability. A larger sample of polluted white dwarfs, targeted with the full ALMA array, has the potential to unambiguously identify the parent source(s) of their planetary debris.