2015/10/16 by E. Bachelet, D. M. Bramich, C. Han +141 · 1 citation
Physics and Astronomy · #Astronomy #Astronomy and Astrophysical Research #Astrophysics #Event (particle physics) #Exoplanet #False positive paradox #Gamma-ray bursts and supernovae #Gravitational microlensing #Light curve #Parallax #Physics #Planet #Stars #Statistics #Stellar, planetary, and galactic studies #astro-ph.EP
paper · pdf · doi:10.1088/0004-637x/812/2/136
accepted ApJ 2015
openalex publication_date 2015/10/16 · arxiv created 2015/10/28 · arxiv updated 2015/10/29 · openalex created_date 2020/11/23 · openalex updated_date 2026/08/05
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 data sets 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 ∼ 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 (∼3 M ⊕ ) 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 favor the planetary interpretation when systematic errors are taken into account.