We obtained new spectra of Kepler-34 and Kepler-35 with Keck-HIRES, nearly a decade after these systems were originally characterized with this spectrograph and other instruments, to search for RV trends from a potential third stellar-mass companion at long periods. For Kepler-34, we rule out coplanar stellar masses as low as 0.12M⊙ at an orbital period of ≲52 years. For Kepler-35, we rule out stellar masses of 0.13M⊙ at orbital periods of ≲55 years. Highly stable, extreme precision RV instruments, as well as improved methodologies in characterizing double-lined spectroscopic binaries that come with these new instruments, will provide an opportunity to push these mass limits lower in the future.
@article{arxiv.2408.15320,
title = {Upper Limits on Stellar Companions to the Kepler-34 and Kepler-35 Systems},
author = {Carlos Jurado and Lauren M. Weiss and Laura Daclison and Benjamin M. Tofflemire and Jerome A. Orosz and William F. Welsh},
journal= {arXiv preprint arXiv:2408.15320},
year = {2024}
}