估算HD 69830中碎片盘的质量
Estimating the mass of the debris disc in HD 69830
摘要：
我们提出了一种方法来估计质量的碎片盘在HD 69830系统，其中还拥有三个系外行星与海王星一样的最小质量。考虑到公布的恒星年龄的范围，我们解释的红外辐射的碎片盘起源于一个稳定的状态，碰撞级联的尘埃颗粒。使用动态生存模型进行观测的限制，我们估计的光盘质量的允许范围。如果圆盘的年龄约为1 Gyr，那么它的质量是我们小行星带的几倍。盘的最大允许年龄和它所包含的微行星的数量由微行星的结合能的假设值决定。如果我们坚持把圆盘解释为瞬变的，那么这个质量估计就成了一个上限。
英文摘要：
We present a method to estimate the mass of the debris disc in the HD 69830 system, which also hosts three exoplanets with Neptune-like minimum masses. By considering the range of published stellar ages, we interpret the infrared emission from the debris disc as originating from a steady state, collisional cascade of dust grains. Using dynamical survival models subjected to observational constraints, we estimate the allowed range of disc masses. If the disc has an age of about 1 Gyr, then its mass is several times that of our asteroid belt. The maximum allowed age for the disc and the number of planetesimals it contains are determined by the assumed value for the binding energy of the planetesimals. If one insists on interpreting the disc as being transient, then this mass estimate becomes an upper limit.
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