微引力透镜发现一颗围绕年老场褐矮星的紧密、低质量比行星质量天体
地球与行星天体物理
2015-06-16 v2
摘要
对年轻褐矮星周围吸积盘的观测引发了它们可能像普通恒星一样形成行星系统的猜想。尽管已有几次在褐矮星周围探测到行星质量天体（2MASS 1207-3932和2MASS 0441-2301），但这些伴星具有相对较大的质量比和投影间距，表明它们以类似于恒星双星的方式形成。我们通过引力微透镜发现了一颗行星质量天体绕场褐矮星运行，即OGLE-2012-BLG-0358Lb。该系统是一个低次级/主星质量比（0.080 ± 0.001）、相对紧密分离（~0.87 AU）的双星，由一个质量为1.9 ± 0.2木星质量的行星质量天体绕一颗质量为0.022 M_sun的褐矮星组成。相对较小的质量比和分离距离表明，该伴星可能是在褐矮星宿主周围的原行星盘中形成的，方式类似于行星。
引用
@article{arxiv.1307.6335,
title = {Microlensing Discovery of a Tight, Low Mass-ratio Planetary-mass Object around an Old, Field Brown Dwarf},
author = {C. Han and Y. K. Jung and A. Udalski and T. Sumi and B. S. Gaudi and A. Gould and D. P. Bennett and Y. Tsapras and M. K. Szymański and M. Kubiak and G. Pietrzyński and I. Soszyński and J. Skowron and S. Kozłowski and R. Poleski and K. Ulaczyk and Ł. Wyrzykowski and P. Pietrukowicz and F. Abe and I. A. Bond and C. S. Botzler and P. Chote and M. Freeman and A. Fukui and K. Furusawa and P. Harris and Y. Itow and C. H. Ling and K. Masuda and Y. Matsubara and Y. Muraki and K. Ohnishi and N. J. Rattenbury and To. Saito and D. J. Sullivan and W. L. Sweatman and D. Suzuki and P. J. Tristram and K. Wada and P. C. M. Yock and V. Batista and G. Christie and J. -Y. Choi and D. L. DePoy and Subo Dong and K. -H. Hwang and A. Kavka and C. -U. Lee and L. A. G. Monard and T. Natusch and H. Ngan and H. Park and R. W. Pogge and I. Porritt and I. -G. Shin and T. G. Tan and J. C. Yee and K. A. Alsubai and V. Bozza and D. M. Bramich and P. Browne and M. Dominik and K. Horne and M. Hundertmark and S. Ipatov and N. Kains and C. Liebig and C. Snodgrass and I. A. Steele and R. A. Street},
journal= {arXiv preprint arXiv:1307.6335},
year = {2015}
}
备注
6 pages, 3 figures, 3 tables, Submitted in ApJ