Can I read OGLE-2016-BLG-1195 AO: Lens, Companion to Lens or Source, or None of the Above? on EtoBox?

OGLE-2016-BLG-1195 AO: Lens, Companion to Lens or Source, or None of the Above? by Gould, Andrew; Shvartzvald, Yossi; Zhang, Jiyuan; Yee, Jennifer C.; Novati, Sebastiano Calchi; Zang, Weicheng; Ofek, Eran O. is a scholarly article available to read on EtoBox.

What is OGLE-2016-BLG-1195 AO: Lens, Companion to Lens or Source, or None of the Above? about?

We systematically investigate the claim by Vandorou et al. (2023) to have detected the host star of the low mass-ratio ($q<10^{-4}$) microlensing planet OGLE-2016-BLG-1195Lb, via Keck adaptive optics (AO) measurements $\Delta t=4.12\,$yr after the peak of the event ($t_0$). If correct, this measurement would contradict the microlens parallax measurement derived from Spitzer observations in solar orbit taken near $t_0$. We show that this host identification would be in $4\,\sigma$ conflict with the original ground-based lens-source relative proper-motion measurements. By contrast, Gould (2022) estimated a probability $p=10\%$ that the ``other star'' resolved by single-epoch late-time AO would be a companion to the host or the microlensed source, which is much more probable than a 4$\,\sigma$ statistical fluctuation. In addition, independent of this proper-motion discrepancy, the kinematics of this host-identification are substantially less probable than those of the Spitzer solution. Hence, this identification should not be accepted, pending additional observations that would either confirm or contradict it, which could be taken in 2023. Motivated by this tension, we present two add

Author

Gould, Andrew; Shvartzvald, Yossi; Zhang, Jiyuan; Yee, Jennifer C.; Novati, Sebastiano Calchi; Zang, Weicheng; Ofek, Eran O.

Published

2023

Language

EN