Dark matter (DM) scattering and its subsequent capture in the Sun can boost the local relic density, leading to an enhanced neutrino flux from DM annihilations that is, in principle, detectable at neutrino telescopes. We calculate the event rates expected for a radiative seesaw model containing both scalar triplet and singlet-doublet fermion DM candidates. In the case of scalar DM, the absence of a spin dependent scattering on nuclei results in a low capture rate in the Sun, which is reflected in an event rate of less than one per year in the current IceCube configuration with 86 strings. For singlet-doublet fermion DM, there is a spin dependent scattering process next to the spin independent one, which significantly boosts the event rate and thus makes indirect detection competitive with respect to the direct detection limits imposed by pico-60. Because of a correlation between both scattering processes, the limits on the spin independent cross section set by xenon1t exclude also parts of the parameter space that can be probed at IceCube. Previously obtained limits by antares, IceCube, and super-kamiokande from the Sun and the Galactic Center are shown to be much weaker.

• Received 12 March 2021
• Accepted 6 May 2021

DOI:https://doi.org/10.1103/PhysRevD.103.123006

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

Published by the American Physical Society