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JWST detection of heavy neutron capture elements in a compact object merger

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arxiv 2307.02098 v1 pith:ZUNWD3LC submitted 2023-07-05 astro-ph.HE astro-ph.CO

JWST detection of heavy neutron capture elements in a compact object merger

A. Levan , B. P. Gompertz , O. S. Salafia , M. Bulla , E. Burns , K. Hotokezaka , L. Izzo , G. P. Lamb
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D. B. Malesani S. R. Oates M. E. Ravasio A. Rouco Escorial B. Schneider N. Sarin S. Schulze N. R. Tanvir K. Ackley G. Anderson G. B. Brammer L. Christensen V. S. Dhillon P. A. Evans M. Fausnaugh W.-F. Fong A. S. Fruchter C. Fryer J. P. U. Fynbo N. Gaspari K. E. Heintz J. Hjorth J. A. Kennea M. R. Kennedy T. Laskar G. Leloudas I. Mandel A. Martin-Carrillo B. D. Metzger M. Nicholl A. Nugent J. T. Palmerio G. Pugliese J. Rastinejad L. Rhodes A. Rossi S. J. Smartt H. F. Stevance A. Tohuvavohu A. van der Horst S. D. Vergani D. Watson T. Barclay K. Bhirombhakdi E. Breedt A. A. Breeveld A. J. Brown S. Campana A. A. Chrimes P. D'Avanzo V. D'Elia M. De Pasquale M. J. Dyer D. K. Galloway J. A. Garbutt M. J. Green D. H. Hartmann P. Jakobsson P. Kerry D. Langeroodi J. K. Leung S. P. Littlefair J. Munday P. O'Brien S. G. Parsons I. Pelisoli A. Saccardi D. I. Sahman R. Salvaterra B. Sbarufatti D. Steeghs G. Tagliaferri C. C. Th\"one A. de Ugarte Postigo D. A. Kann
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classification astro-ph.HE astro-ph.CO
keywords heavycompactelementsgamma-rayneutronnucleosynthesisacrossassociated
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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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), sources of high-frequency gravitational waves and likely production sites for heavy element nucleosynthesis via rapid neutron capture (the r-process). These heavy elements include some of great geophysical, biological and cultural importance, such as thorium, iodine and gold. 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 mergers, and contains a kilonova similar to AT2017gfo, associated with the gravitational-wave merger GW170817. 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.

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Cited by 4 Pith papers

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  4. Electromagnetic Follow-up of the Sub-Solar Mass Gravitational Wave Candidate S251112cm: Kilonova Constraints and a Coincident IIb Supernova

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