NIKA2时代的恒星周围碎屑盘
地球与行星天体物理
2020-02-12 v1 太阳与恒星天体物理
摘要
利用IRAM 30m射电望远镜上的新型NIKA2相机观测了三个已知的碎屑盘，以约束其尘埃发射在毫米波长域的SED。我们发现两个NIKA2波段（1mm和2mm）之间的光谱指数与瑞利-金斯区（λ^{-2}）一致，不同于在亚毫米波长域对其中两个盘——围绕恒星Vega和HD107146——测得的更陡光谱（λ^{-3}）。我们提供了一个成功的建模概念证明，使用两群尘埃颗粒（半径小于和大于粒径a0=0.5mm的颗粒）来解释这种光谱反转。这是通过在a0处打破标准模型粒径分布的斜率和吸收系数的函数形式而实现的。第三个盘——围绕恒星HR8799——未表现出这种光谱反转，但也是三者中最年轻的。
引用
@article{arxiv.1911.06250,
title = {Debris disks around stars in the NIKA2 era},
author = {J. -F. Lestrade and J. -C. Augereau and M. Booth and R. Adam and P. Ade and P. Andre and A. Andrianasolo and H. Aussel and A. Beelen and A. Benoit and A. Bideaud and O. Bourrion and M. Calvo and A. Catalano and B. Comis and M. De Petris and F. -X. Desert and S. Doyle and E. F. C. Driessen and A. Gomez and J. Goupy W. Holland and F. Keruzore and C. Kramer and B. Ladjelate and G. Lagache and S. Leclercq and C. Lefevre and J. F. Macias-Perez and P. Mauskopf and F. Mayet and A. Monfardini and L. Perotto and G. Pisano and N. Ponthieu and V. Reveret and A. Ritacco and C. Romero and H. Roussel and F. Ruppin and K. Schuster and S. Shu and A. Sievers and P. Thebault and C. Tucker and R. Zylka},
journal= {arXiv preprint arXiv:1911.06250},
year = {2020}
}
备注
6 pages, 8 figures, to appear in the proceedings of the international conference entitled mm Universe @ NIKA2, Grenoble (France), June 2019, EPJ Web of conferences