We develop stellar population models to predict the number of binaries with a single luminous member is Gaia and Hipparcos. Our models yield dozens of detections of black hole - luminous companion binaries (BHLC) and hundreds to thousands of neutron star - luminous companion binaries (NSLC) with Gaia. Interestingly, our models also yield a single detection of BHLC binary with Hipparcos, and a few NSLC binaries. We also show how the statistical distribution of detected binaries with a single luminous companion can be used to constrain the formation process of neutron stars and black holes.
@article{arxiv.1807.00835,
title = {Dark Passengers in Stellar Surveys},
author = {Almog Yalinewich and Paz Beniamini and Kenta Hotokezaka and Wei Zhu},
journal= {arXiv preprint arXiv:1807.00835},
year = {2018}
}