Red noise versus planetary interpretations in the microlensing event OGLE-2013-BLG-446
Abstract
For all exoplanet candidates, the reliability of a claimed detection needs to be assessed through a careful study of systematic errors in the data to minimize the false positives rate. We present a method to investigate such systematics in microlensing datasets using the microlensing event OGLE-2013-BLG-0446 as a case study. The event was observed from multiple sites around the world and its high magnification (A_{max} \sim 3000) allowed us to investigate the effects of terrestrial and annual parallax. Real-time modeling of the event while it was still ongoing suggested the presence of an extremely low-mass companion (\sim 3M_\oplus ) to the lensing star, leading to substantial follow-up coverage of the light curve. We test and compare different models for the light curve and conclude that the data do not favour the planetary interpretation when systematic errors are taken into account.
Keywords
Cite
@article{arxiv.1510.02724,
title = {Red noise versus planetary interpretations in the microlensing event OGLE-2013-BLG-446},
author = {E. Bachelet and D. M. Bramich and C. Han and J. Greenhill and R. A. Street and A. Gould and G. D Ago and K. AlSubai and M. Dominik and R. Figuera Jaimes and K. Horne and M. Hundertmark and N. Kains and C. Snodgrass and I. A. Steele and Y. Tsapras and M. D. Albrow and V. Batista and J. -P. Beaulieu and D. P. Bennett and S. Brillant and J. A. R. Caldwell and A. Cassan and A. Cole and C. Coutures and S. Dieters and D. Dominis Prester and J. Donatowicz and P. Fouque and K. Hill and J. -B. Marquette and J. Menzies and C. Pere and C. Ranc and J. Wambsganss and D. Warren and L. Andrade de Almeida and J. -Y. Choi and D. L. DePoy and Subo Dong and L. -W. Hung and K. H. Hwang and F. Jablonski and Y. K. Jung and S. Kaspi and N. Klein and C. -U. Lee and D. Maoz and J. A. Munoz and D. Nataf and H. Park and R. W. Pogge and D. Polishook and I. -G. Shin and A. Shporer and J. C. Yee F. Abe and A. Bhattacharya and I. A. Bond and C. S. Botzler and M. Freeman and A. Fukui and Y. Itow and N. Koshimoto and C. H. Ling and K. Masuda and Y. Matsubara and Y. Muraki and K. Ohnishi and L. C. Philpott and N. Rattenbury and To. Saito and D. J. Sullivan and T. Sumi and D. Suzuki and P. and J. Tristram and A. Yonehara and V. Bozza and S. Calchi Novati and S. Ciceri and P. Galianni and S. H. Gu and K. Harpsoe and T. C. Hinse and U. G. Jorgensen and D. Juncher and H. Korhonen and L. Mancini and C. Melchiorre and A. Popovas and A. Postiglione and M. Rabus and S. Rahvar and R. W. Schmidt and G. Scarpetta and J. Skottfelt and John Southworth and An. Stabile and J. Surdej and X. -B. Wang and O. Wertz},
journal= {arXiv preprint arXiv:1510.02724},
year = {2015}
}
Comments
accepted ApJ 2015