微引力透镜事件OGLE-2019-BLG-0033/MOA-2019-BLG-035中双星系统褐矮星质量的精确测量
太阳与恒星天体物理
2022-07-20 v3 地球与行星天体物理
星系天体物理
摘要
背景。褐矮星是介于恒星与行星之间了解甚少的过渡天体，其形成已有若干相互竞争的机制被提出。质量测量对于孤立天体以及围绕低质量恒星运行的褐矮星通常都很困难，后者往往过于暗弱而无法进行光谱后续观测。目的。微引力透镜为发现和研究此类暗弱系统提供了替代工具。本文给出微引力透镜事件OGLE-2019-BLG-0033/MOA-2019-BLG-035的分析，该事件由一颗褐矮星绕红矮星组成的双星系统引起。方法。得益于广泛的地面观测以及Spitzer空间观测的可用性，已可能获得所有微引力透镜参数的准确估计，包括视差、源半径和双星透镜的轨道运动。结果。经过精确建模，我们发现透镜由质量为M_1 = 0.149 ± 0.010M_⊙的红矮星和质量为M_2 = 0.0463 ± 0.0031M_⊙的褐矮星组成，投影分离a_⊥ = 0.585 au。该系统具有厚盘中古老贫金属星族典型的奇异性速度。迄今为止，褐矮星质量的百分比精度测量仅在少数微引力透镜事件中实现，但有望随着Roman空间望远镜而变得常见。
引用
@article{arxiv.2203.04034,
title = {Precision measurement of a brown dwarf mass in a binary system in the microlensing event OGLE-2019-BLG-0033/MOA-2019-BLG-035},
author = {A. Herald and A. Udalski and V. Bozza and P. Rota and I. A. Bond and J. C. Yee and S. Sajadian and P. Mroz and R. Poleski and J. Skowron and M. K. Szymanski and I. Soszynski and P. Pietrukowicz and S. Kozlowski and K. Ulaczyk and K. A. Rybicki and P. Iwanek and M. Wrona and M. Gromadzki and F. Abe and R. Barry and D. P. Bennett and A. Bhattacharya and A. Fukui and H. Fujii and Y. Hirao and Y. Itow and R. Kirikawa and I. Kondo and N. Koshimoto and Y. Matsubara and S. Matsumoto and S. Miyazaki and Y. Muraki and G. Olmschenk and C. Ranc and A. Okamura and N. J. Rattenbury and Y. Satoh and T. Sumi and D. Suzuki and S. Ishitani Silva and T. Toda and P. J. Tristram and A. Vandorou and H. Yama and C. A. Beichman and G. Bryden and S. Calchi Novati and S. Carey and B. S. Gaudi and A. Gould and C. B. Henderson and S. Johnson and Y. Shvartzvald and W. Zhu and M. Dominik and M. Hundertmark and U. G. Jorgensen and P. Longa-Pena and J. Skottfelt and J. Tregloan-Reed and N. Bach-Moller and M. Burgdorf and G. D'Ago and L. Haikala and J. Hitchcock and E. Khalouei and N. Peixinho and S. Rahvar and C. Snodgrass and J. Southworth and P. Spyratos and W. Zang and H. Yang and S. Mao and E. Bachelet and D. Maoz and R. A. Street and Y. Tsapras and G. W. Christie and T. Cooper and L. de Almeida and J. -D. do Nascimento and J. Green and C. Han and S. Hennerley and A. Marmont and J. McCormick and L. A. G. Monard and T. Natusch and R. Pogge},
journal= {arXiv preprint arXiv:2203.04034},
year = {2022}
}
备注
13 pages, 6 figures