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Related Experiment Video

Updated: Sep 30, 2025

High-Temperature and High-Pressure In situ Magic Angle Spinning Nuclear Magnetic Resonance Spectroscopy

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Published on: October 9, 2020

Time-resolved hadronic particle acceleration in the recurrent nova RS Ophiuchi.

, F Aharonian^1,2,3, F Ait Benkhali⁴

¹Dublin Institute for Advanced Studies, 31 Fitzwilliam Place, Dublin 2, Ireland.

Science (New York, N.Y.)

|March 10, 2022

Summary

Astronomers detected very-high-energy gamma rays from the recurrent nova RS Ophiuchi, confirming particle acceleration in stellar explosions. This finding supports hadronic emission models for cosmic ray origins.

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Published on: January 30, 2020

Area of Science:

Astrophysics
High-energy astrophysics
Cosmic ray physics

Background:

Recurrent novae involve thermonuclear explosions on white dwarfs in binary systems.
Accretion from a companion star fuels these explosions.
Particle acceleration is theorized to occur via shocks between ejected material and stellar winds.

Purpose of the Study:

To report the detection of very-high-energy (VHE) gamma rays from the recurrent nova RS Ophiuchi.
To investigate the origin and mechanisms of particle energization in nova outbursts.
To constrain theoretical models of particle acceleration and emission processes.

Main Methods:

Observations of RS Ophiuchi using the High Energy Stereoscopic System (H.E.S.S.).
Analysis of VHE gamma-ray emission up to one month post-outburst (2021).
Comparison of temporal profiles with lower-energy gamma-ray emission.

Main Results:

Detection of VHE gamma-ray signals from RS Ophiuchi following its 2021 outburst.
VHE emission profile mirrors lower-energy gamma-ray emission, with a 2-day peak flux delay.
Observations favor hadronic emission models over leptonic ones for particle energization.

Conclusions:

Shocks within dense stellar winds are efficient sites for cosmic ray acceleration to very high energies.
The study provides crucial observational constraints on time-dependent particle energization models.
RS Ophiuchi serves as a key laboratory for studying extreme astrophysical particle acceleration.