On the diversity of magnetar-driven kilonovae

• DOI: 10.1093/mnras/stac2609
• Publication Date: 2022-09-13T21:01:47Z
• Authors: Nikhil Sarin; Conor M B Omand; Ben Margalit; David I Jones
• Keywords: Kilonova; Magnetar

ABSTRACT A non-negligible fraction of binary neutron star mergers are expected to form long-lived remnants, dramatically altering the multimessenger signatures a merger. Here, we extend existing models for magnetar-driven kilonovae and explore diversity kilonova afterglows. Focusing on role (uncertain) magnetic field strength, study resulting electromagnetic as function external dipolar internal toroidal fields. These two parameters govern, respectively, competition between magnetic-dipole spin-down gravitational-wave (due magnetic-field deformation) rapidly rotating remnant. We find that even in parameter space where emission is dominant, with magnetar central engine will be significantly brighter than one without an engine, this more luminosity thermalized. In contrast, system minimal produce may difficult distinguish from ordinary unless early epoch observations available. However, bulk energy goes into accelerating ejecta, such afterglow peak shorter times. To effectively hide presence afterglow, rotational inputted ejecta must ≲10−3to 10−2Erot. discuss different diagnostics available identify serendipitous draw parallels other potential explosions, superluminous supernovae broad-line Ic.