OGLE-2015-BLG-1609Lb: 次行星绕低质量星或棕矮星主机
摘要
We present a comprehensive analysis of a planetary microlensing event OGLE-2015-BLG-1609. The planetary anomaly was detected by two survey telescopes, OGLE and MOA. Each of these surveys collected enough data over the planetary anomaly to allow for an unambiguous planet detection. Such survey detections of planetary anomalies are needed to build a robust sample of planets that could improve studies on the microlensing planetary occurrence rate by reducing biases and statistical uncertainties. In this work, we examined different methods for modeling microlensing events using individual datasets, particularly we incorporated a Galactic model prior to better constrain poorly defined microlensing parallax. Ultimately, we fitted a comprehensive model to all available data, identifying three potential typologies, with two showing comparably high Bayesian evidence. Our analysis indicates that the host of the planet is a brown dwarf with a probability of 34%, or a low-mass stellar object (M-dwarf) with the probability of 66%.
引用
@article{arxiv.2412.09676,
title = {OGLE-2015-BLG-1609Lb: Sub-jovian planet orbiting a low-mass stellar or brown dwarf host},
author = {M. J. Mróz and R. Poleski and A. Udalski and T. Sumi and Y. Tsapras and M. Hundertmark and P. Pietrukowicz and M. K. Szymański and J. Skowron and P. Mróz and M. Gromadzki and P. Iwanek and S. Kozłowski and M. Ratajczak and K. A. Rybicki and D. M. Skowron and I. Soszyński and K. Ulaczyk and M. Wrona and F. Abe and K. Bando and D. P. Bennett and A. Bhattacharya and I. A. Bond and A. Fukui and R. Hamada and S. Hamada and N. Hamasaki and Y. Hirao and S. Ishitani Silva and Y. Itow and N. Koshimoto and Y. Matsubara and S. Miyazaki and Y. Muraki and T. Nagai and K. Nunota and G. Olmschenk and C. Ranc and N. J. Rattenbury and Y. Satoh and D. Suzuki and S. K. Terry and P. J. Tristram and A. Vandorou and H. Yama and R. A. Street and E. Bachelet and M. Dominik and A. Cassan and R. Figuera Jaimes and K. Horne and R. Schmidt and C. Snodgrass and J. Wambsganss and I. A. Steele and J. Menzies and U. G. Jørgensen and P. Longa-Peña and N. Peixinho and J. Skottfelt and J. Southworth and M. I. Andersen and V. Bozza and M. J. Burgdorf and G. D'Ago and T. C. Hinse and E. Kerins and H. Korhonen and M. Küffmeier and L. Mancini and M. Rabus and S. Rahvar},
journal= {arXiv preprint arXiv:2412.09676},
year = {2025}
}
备注
12 pages, 7 figures