KMT-2024-BLG-0816/OGLE-2024-BLG-0519 -- A Microlensing Event with Candidate Free-Floating Planet Lens and Blended Light

TL;DR

This paper reports the discovery of a microlensing event likely caused by a free-floating planet, highlighting unique blending characteristics and discussing follow-up observations to clarify the nature of the blending light.

Contribution

It presents a rare free-floating planet microlensing event with finite-source effects and unresolved blending light, offering insights into the event's nature and follow-up strategies.

Findings

First free-floating planet event with finite-source effects and unresolved blending light

Blended light may originate from a planet host or unrelated source

Follow-up observations are crucial to determine the nature of the blending light

Abstract

We present the discovery of a free-floating planet microlensing event KMT-2024-BLG-0816. The event shows finite-source effect, significant blending light, and no microlensing signal from a putative planet host. Among the free-floating planet events with finite source effects, this is the only event with unresolved blending light. We discuss how follow-up observations can be used to determine whether the blending light originates from a putative planet host.