Radio and X-ray observations of the luminous Fast Blue Optical Transient AT2020xnd
Joe S. Bright, Raffaella Margutti, David Matthews, Daniel Brethauer,, Deanne Coppejans, Mark H. Wieringa, Brian D. Metzger, Lindsay DeMarchi,, Tanmoy Laskar, Charles Romero, Kate D. Alexander, Assaf Horesh, Giulia, Migliori, Ryan Chornock, E. Berger, Michael Bietenholz

TL;DR
This paper reports deep radio and X-ray observations of the luminous FBOT AT2020xnd, revealing high-velocity outflows, dense circumstellar interaction, and a possible accretion-powered X-ray component, establishing it as a high-redshift analog to AT2018cow.
Contribution
First detailed multi-wavelength study of AT2020xnd, confirming its similarities to AT2018cow and identifying its high-velocity outflows and potential accretion-powered X-ray emission.
Findings
Luminous radio emission indicating high-velocity outflows (~0.1-0.2c).
Luminous, rapidly fading soft X-ray emission with a different origin from radio.
AT2020xnd is a high-redshift analog of AT2018cow, expanding the class of luminous FBOTs.
Abstract
We present deep X-ray and radio observations of the Fast Blue Optical Transient (FBOT) AT2020xnd/ZTF20acigmel at from d to d after explosion. AT2020xnd belongs to the category of optically luminous FBOTs with similarities to the archetypal event AT2018cow. AT2020xnd shows luminous radio emission reaching ergsHz at 20GHz and d post explosion, accompanied by luminous and rapidly fading soft X-ray emission peaking at ergs. Interpreting the radio emission in the context of synchrotron radiation from the explosion's shock interaction with the environment we find that AT2020xnd launched a high-velocity outflow (0.1-0.2) propagating into a dense circumstellar medium (effective yr for an assumed wind velocity of kms). Similar…
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Taxonomy
TopicsLaser-Plasma Interactions and Diagnostics · Gamma-ray bursts and supernovae · Astrophysical Phenomena and Observations
