An off-axis relativistic jet seen in the long lasting delayed radio flare of the TDE AT 2018hyz
Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 527:3 (2023) 7672-7680
SN 2022jli: A Type Ic Supernova with Periodic Modulation of Its Light Curve and an Unusually Long Rise
The Astrophysical Journal Letters 956:1 (2023)
Heavy element production in a compact object merger observed by JWST.
Abstract:The mergers of binary compact objects such as neutron stars and black holes are of central interest to several areas of astrophysics, including as the progenitors of gamma-ray bursts (GRBs)1, sources of high-frequency gravitational waves (GW)2 and likely production sites for heavy element nucleosynthesis via rapid neutron capture (the r-process)3. Here we present observations of the exceptionally bright gamma-ray burst GRB 230307A. We show that GRB 230307A belongs to the class of long-duration gamma-ray bursts associated with compact object mergers4-6, and contains a kilonova similar to AT2017gfo, associated with the gravitational-wave merger GW1708177-12. We obtained James Webb Space Telescope mid-infrared (mid-IR) imaging and spectroscopy 29 and 61 days after the burst. The spectroscopy shows an emission line at 2.15 microns which we interpret as tellurium (atomic mass A=130), and a very red source, emitting most of its light in the mid-IR due to the production of lanthanides. These observations demonstrate that nucleosynthesis in GRBs can create r-process elements across a broad atomic mass range and play a central role in heavy element nucleosynthesis across the Universe.
Commensal transient searches in eight short gamma-ray burst fields
Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 526:2 (2023) 1888-1903
AT 2022aedm and a New Class of Luminous, Fast-cooling Transients in Elliptical Galaxies
The Astrophysical Journal Letters American Astronomical Society 954:1 (2023) l28