Type Ia supernovae
E374518
Type Ia supernovae are a class of stellar explosions with nearly uniform intrinsic brightness, making them powerful standard candles for measuring cosmic distances and probing the expansion history of the universe.
All labels observed (3)
| Label | Occurrences |
|---|---|
| Type Ia supernovae canonical | 12 |
| SNe Ia | 1 |
| Type Ia | 1 |
How this entity was disambiguated
This entity first appeared as the object of triple T3628698 — resolving that mention is where its identity was fixed. The disambiguator weighed these candidate entities and picked the highlighted one (or “None”, minting a new entity). This is how homonymy is resolved: the same surface form can point to different entities.
NED1
Entity disambiguation (via context triple)
gpt-5-mini-2025-08-07
Target entity: Type Ia supernovae Context triple: [Dark Energy Survey, cosmologicalProbe, Type Ia supernovae]
-
A.
Carnegie Supernova Project
The Carnegie Supernova Project is an astronomical research initiative focused on observing and characterizing supernovae to improve measurements of cosmic distances and the expansion of the universe.
-
B.
Swope Supernova Survey
The Swope Supernova Survey is an astronomical observing program focused on discovering and studying supernovae using the Swope Telescope at Las Campanas Observatory.
-
C.
Supernova
"Supernova" is a 2009 electro-pop single by British singer-songwriter Mr Hudson, featuring Kanye West, known for its futuristic production and melodic hook.
-
D.
SN 1572
SN 1572 is a historically significant supernova in the constellation Cassiopeia whose detailed observations by Tycho Brahe helped challenge the Aristotelian view of an unchanging heavens.
-
E.
supernova SN 1954J
Supernova SN 1954J is a mid-20th-century stellar explosion event in an external galaxy that became notable through detailed optical observations and analysis by astronomers.
- F. None of above. chosen
- G. Unsure - the case is ambiguous/there is not enough information to decide.
NED2
Entity disambiguation (via description)
gpt-5-mini-2025-08-07
Target entity: Type Ia supernovae Target entity description: Type Ia supernovae are a class of stellar explosions with nearly uniform intrinsic brightness, making them powerful standard candles for measuring cosmic distances and probing the expansion history of the universe.
-
A.
Carnegie Supernova Project
The Carnegie Supernova Project is an astronomical research initiative focused on observing and characterizing supernovae to improve measurements of cosmic distances and the expansion of the universe.
-
B.
Swope Supernova Survey
The Swope Supernova Survey is an astronomical observing program focused on discovering and studying supernovae using the Swope Telescope at Las Campanas Observatory.
-
C.
Supernova
"Supernova" is a 2009 electro-pop single by British singer-songwriter Mr Hudson, featuring Kanye West, known for its futuristic production and melodic hook.
-
D.
SN 1572
SN 1572 is a historically significant supernova in the constellation Cassiopeia whose detailed observations by Tycho Brahe helped challenge the Aristotelian view of an unchanging heavens.
-
E.
supernova SN 1954J
Supernova SN 1954J is a mid-20th-century stellar explosion event in an external galaxy that became notable through detailed optical observations and analysis by astronomers.
- F. None of above. chosen
Statements (52)
| Predicate | Object |
|---|---|
| instanceOf |
astronomical phenomenon
ⓘ
standard candle ⓘ supernova type ⓘ |
| associatedNobelPrize | 2011 Nobel Prize in Physics ⓘ |
| cosmologicalUse |
constraining dark energy
ⓘ
constructing the cosmic distance ladder ⓘ measuring cosmological parameters ⓘ measuring extragalactic distances ⓘ measuring the Hubble constant ⓘ probing the expansion history of the universe ⓘ |
| discoveryContribution |
evidence for accelerating expansion of the universe
ⓘ
evidence for dark energy ⓘ |
| distanceIndicatorRole | primary distance indicators for cosmology ⓘ |
| distanceRange | observable to redshifts greater than 1 ⓘ |
| energySource |
fusion of carbon and oxygen
ⓘ
radioactive decay of cobalt-56 ⓘ radioactive decay of nickel-56 ⓘ |
| explosionMechanism | thermonuclear runaway ⓘ |
| hasAlternativeName |
SNe Ia
ⓘ
linked to:
Type Ia supernovae
Type I-a supernovae ⓘ |
| hasSubclass |
1991T-like Type Ia supernovae
ⓘ
1991bg-like Type Ia supernovae ⓘ normal Type Ia supernovae ⓘ overluminous Type Ia supernovae ⓘ underluminous Type Ia supernovae ⓘ |
| hostEnvironment |
elliptical galaxies
ⓘ
lenticular galaxies ⓘ old stellar populations ⓘ spiral galaxies ⓘ young stellar populations ⓘ |
| intrinsicBrightness | nearly uniform ⓘ |
| lightCurveFeature |
correlation between decline rate and peak luminosity
ⓘ
secondary maximum in near-infrared bands ⓘ |
| observationalBand |
near-infrared wavelengths
ⓘ
optical wavelengths ⓘ |
| openQuestion |
details of explosion mechanism
ⓘ
exact nature of progenitor systems ⓘ |
| progenitorScenario |
double-degenerate scenario
ⓘ
single-degenerate scenario ⓘ |
| progenitorSystem | binary star system ⓘ |
| spectralFeature |
lack of helium lines
ⓘ
lack of hydrogen lines ⓘ strong silicon II absorption line near 6150 Å ⓘ |
| standardizationMethod | Phillips relation ⓘ |
| typicalEjectedMass | on the order of one solar mass ⓘ |
| typicalExplosionEnergy | about 10^51 ergs ⓘ |
| typicalHostStellarPopulationAge | often several billion years ⓘ |
| typicalNickelMass | about 0.4–0.8 solar masses of nickel-56 ⓘ |
| typicalPeakAbsoluteMagnitude | about −19.3 in B band ⓘ |
| typicalProgenitor | carbon–oxygen white dwarf ⓘ |
| typicalRiseTime | about 17–20 days to B-band maximum ⓘ |
| usedAs | standardizable candles ⓘ |
How these facts were elicited
The pipeline generated the facts above by prompting gpt-5.1 with this entity's name + description and the instruction below.
Instruction
You are a knowledge base construction expert. Given a subject entity and a description of it, return factual statements that you know for the subject as a JSON list of dictionaries(triples), where keys must be "subject", "predicate" and "object". The number of facts may be very high, between 25 to 50 or more, for very popular subjects. For less popular subjects, the number of facts can be very low, like 5 or 10. # Requirements - If you don't know the subject at all, return an empty list. - If the subject is not a named entity, return an empty list. - Include at least one triple where predicate is "instanceOf". - Do not get too wordy. - Separate several objects into multiple triples with one object.
Input
Subject: Type Ia supernovae Description of subject: Type Ia supernovae are a class of stellar explosions with nearly uniform intrinsic brightness, making them powerful standard candles for measuring cosmic distances and probing the expansion history of the universe.
Referenced by (14)
Full triples — surface form annotated when it differs from this entity's canonical label.