OGLE-2011-BLG-0417: A Radial Velocity Testbed for Microlensing

TL;DR

This paper proposes using radial velocity measurements to test and validate microlensing-derived planetary system parameters, exemplified by the case of OGLE-2011-BLG-0417, which offers a complete Kepler solution.

Contribution

It introduces a method to verify microlensing results through RV observations, focusing on a specific case with a well-characterized lens system.

Findings

The microlensing event OGLE-2011-BLG-0417 has a bright lens primary.

Predicted RV semi-amplitude for the lens is approximately 6.35 km/s.

The case provides an opportunity for a precision test of microlensing measurements.

Abstract

Microlensing experiments are returning increasingly detailed information about the planetary and binary systems that are being detected, far beyond what was originally expected. In several cases the lens mass and distance are measured, and a few very special cases have yielded complete 8-parameter Kepler solutions, i.e., the masses of both components, five Kepler invariants and the phase. We identify one such case that is suitable for a precision test that could be carried out by comparing Doppler (RV) measurements with the predictions from the microlensing solution. The lens primary is reasonably bright (I=16.3, V=18.0) and is expected to have a relatively large RV semi-amplitude K ~ 6.35 km/s).