利用双子星行星成像仪对 HR 4796A 的多波段偏振成像
地球与行星天体物理
2020-07-29 v1 天体物理仪器与方法
太阳与恒星天体物理
摘要
HR4796A 拥有一个研究历史悠久的著名碎屑盘，因其高分数光度和有利倾角，非常适合非分辨与分辨观测。我们展示了利用双子星行星成像仪（GPI）偏振模式拍摄的 HR4796A 分辨碎屑盘的新 J 波段和 K1 波段图像。偏振强度呈现强烈前向散射的亮度分布，且在盘远侧未探测到。总强度在所有散射角均被探测到，并同样表现出强前向散射峰。我们使用前向建模的几何盘来提取这些数据和 GPI 先前拍摄的 H 波段数据的几何参数、偏振分数和总强度散射相函数。我们发现偏振相函数随波长增加变得越来越前向散射。我们将 Mie 和空心球分布（DHS）颗粒模型拟合到提取的函数。我们发现，虽然可用 DHS 模型为总强度生成满意模型，但 Mie 模型不行。我们发现，任意成分的单一 DHS 或 Mie 颗粒种群均无法同时重现偏振分数和总强度散射相函数，表明需要更复杂的颗粒模型。
引用
@article{arxiv.2006.06818,
title = {Multiband Polarimetric Imaging of HR 4796A with the Gemini Planet Imager},
author = {Pauline Arriaga and Michael P. Fitzgerald and Gaspard Duchêne and Paul Kalas and Maxwell A. Millar-Blanchaer and Marshall D. Perrin and Christine H. Chen and Johan Mazoyer and Mark Ammons and Vanessa P. Bailey and Trafis S. Barman and Joanna Bulger and Jeffrey K. Chilcote and Tara Cotten and Robert J. De Rosa and Rene Doyon and Thomas M. Esposito and Katherine B. Follette and Benjamin L. Gerard and Stephen Goodsell and James R. Graham and Alexandra Z. Greenbaum and Pascale Hibon and Justin Hom and Li-Wei Hung and Patrick Ingraham and Quinn M. Konopacky and Bruce A. Macintosh and Jérôme Maire and Franck Marchis and Mark S. Marley and Christian Marois and Stanimir Metchev and Eric L. Nielsen and Rebecca Oppenheimer and David W. Palmer and Jenny Patience and Lisa A. Poyneer and Laurent Pueyo and Abhijith Rajan and Julien Rameau and Fredrik T. Rantakyrö and Jean-Baptiste Ruffio and Dmitry Savransky and Adam C. Schneider and Anand Sivaramakrishnan and Inseok Song and Remi Soummer and Sandrine Thomas and Jason J. Wang and Kimberly Ward-Duong and Schuyler G. Wolff},
journal= {arXiv preprint arXiv:2006.06818},
year = {2020}
}
备注
Accepted for publication in AJ. 3 tables, 11 figures