Quark-nova
Hypothetical explosion from neutron star to quark star conversion.
A quark-nova is a theorized explosive event that occurs when a neutron star transforms into a quark star. This process is similar to how a supernova marks the birth of a neutron star, while a quark-nova would signal the formation of a quark star. The term was introduced in 2002 by Rachid Ouyed (now at the University of Calgary, Canada) and researchers J. Dey and M. Dey from Calcutta University, India.
The transformation, called quark deconfinement, may happen as a neutron star’s rotation slows down. The resulting star would contain quark matter in its core. This phase transition could release enormous energy—calculations suggest up to 10⁴⁶ joules—possibly explaining some of the most powerful explosions in the universe. Quark-novae might be a source of gamma-ray bursts. According to Jaikumar and colleagues, they could also contribute to the creation of heavy elements like platinum through r-process nucleosynthesis.
The best hypothetical candidates for such an event are rapidly spinning neutron stars with masses between 1.5 and 1.8 times that of the Sun, provided their spin slows enough within a Hubble time. This represents a small portion of all neutron stars. A conservative estimate suggests that up to two quark-novae could occur in the observable universe each day. Quark stars are thought to be radio-quiet, so radio-quiet neutron stars may actually be quark stars.
Direct observational evidence for quark-novae is limited, but recent observations of supernovae SN 2006gy, SN 2005gj, and SN 2005ap may hint at their existence.
- coined
- 2002
- coined_by
- Rachid Ouyed, J. Dey, M. Dey
- field
- Astrophysics
- related_to
- Neutron stars, quark stars, gamma-ray bursts
- energy_released
- Up to 10^46 J
- possible_cause_of
- Gamma-ray bursts
Lore & Background
When a neutron star's rotation slows down, it may convert to a quark star through a process known as quark deconfinement. The resultant star would have quark matter in its interior. The process would release immense amounts of energy, perhaps explaining the most energetic explosions in the universe; calculations have estimated that as much as 10^46 J could be released from the phase transition inside a neutron star. Quark-novae may be one cause of gamma ray bursts. According to Jaikumar and collaborators, they may also be involved in producing heavy elements such as platinum through r-process nucleosynthesis.
Rapidly spinning neutron stars with masses between 1.5 and 1.8 solar masses are hypothetically the best candidates for conversion due to spin down of the star within a Hubble time. This amounts to a small fraction of the projected neutron star population. A conservative estimate based on this indicates that up to two quark-novae may occur in the observable universe each day. Hypothetically, quark stars would be radio-quiet, so radio-quiet neutron stars may be quark stars.
Direct evidence for quark-novae is scant; however, recent observations of supernovae SN 2006gy, SN 2005gj and SN 2005ap may point to their existence.
Reader's Guide
The quark-nova concept provides a theoretical framework for understanding some of the most energetic events in the universe, potentially linking neutron star evolution to gamma-ray bursts and the synthesis of heavy elements. Although direct observational evidence remains scant, the hypothesis offers a plausible mechanism for energy releases far exceeding ordinary supernovae. The estimated rate of up to two quark-novae per day in the observable universe suggests they could be relatively common, yet their detection is challenging because quark stars are predicted to be radio-quiet. Observations of certain supernovae, such as SN 2006gy, SN 2005gj, and SN 2005ap, have been considered as possible candidates, but the connection remains unconfirmed. The idea also ties into broader studies of QCD matter and quark-degenerate matter, representing a frontier in high-energy astrophysics where nuclear physics and stellar evolution intersect. Future neutrino observatories may detect bursts from such events, offering a potential means of verification.
Did You Know?
- The term quark-nova was coined in 2002 by Rachid Ouyed, J. Dey, and M. Dey.
- A quark-nova may release up to 10^46 J of energy.
- Quark-novae may be one cause of gamma ray bursts.
- Up to two quark-novae may occur in the observable universe each day.
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