Shunke Ai and Bing Zhang 2021 ApJL 915 L11
Analysis shows the X-ray transient XRT 201423, which has a nearly flat plateau lasting 4.1 ks followed by a steep decay, is consistent with the signal expected from a magnetar formed through a binary neutron star merger.
M. M. Hedman and M. Young 2021 Planet. Sci. J. 2 127
Small-scale structures observed in Saturn’s E-ring may be caused by a new type of wake produced by Enceladus’s gravitational perturbations.
Adam S. Jermyn et al 2021 ApJ 914 105
Stars formed in or captured by accretion disks in active galactic nuclei spin up rapidly via accretion, eventually reaching and maintaining near-critical rotation rates. They may later evolve into high-spin massive black holes.
M. G. Dainotti et al 2021 ApJL 914 L40
Recent analysis suggests short gamma-ray bursts may have been more luminous in the past, with an formation rate delayed relative to the star formation rate, as expected if they are the products of stellar remnant mergers.
Hannah Diamond-Lowe et al 2021 AJ 162 10
New ultraviolet observations evaluate the high-energy environment around a nearby mid-M dwarf, LHS 3844, which hosts a terrestrial world that lacks a substantial atmosphere.
Anthony Carr and Tamara Davis 2021 ApJ 914 97
A small systematic error is identified in the NASA/IPAC Extragalactic Database (NED) and the effects are described on the reported redshifts in this catalog of millions of astrophysical objects.