The interacting nature of dwarf galaxies hosting superluminous supernovae

Abstract

(Abridged) Type I superluminous supernovae (SLSNe I) are rare, powerful explosions whose mechanism and progenitors remain elusive. SLSNe I show a preference for low-metallicity, actively star-forming dwarf galaxies. We investigate whether the hosts of SLSNe I show increased evidence for interaction. We use a sample of 42 SLSN I images obtained with $\text{HST}$ and measure the number of companion galaxies by counting the objects detected within a given radius from the host. As a comparison, we used two Monte Carlo-based methods to estimate the expected average number of companion objects in the same images, as well as a sample of 32 galaxies that have hosted long gamma-ray bursts (GRBs). About 50% of SLSN I hosts have at least one major companion (within a flux ratio of 1:4) within 5 kpc. The average number of major companions per SLSN I host galaxy is $0.70_{-0.14}^{+0.19}$. Our Monte Carlo comparison methods yield a lower number of companions for random objects of similar brightness in the same image or for the SLSN host after randomly redistributing the sources in the same image. The Anderson-Darling test shows that this difference is statistically significant independent of the redshift range. The same is true for the projected distance distribution of the companions. The SLSN I hosts are, thus, found in areas of their images, where the object number density is greater than average. SLSN I hosts have more companions than GRB hosts ($0.44_{-0.13}^{+0.25}$ companions per host distributed over 25% of the hosts) but the difference is not statistically significant. The difference between their separations is, however, marginally significant. The dwarf galaxies hosting SLSNe I are often part of interacting systems. This suggests that SLSNe I progenitors are formed after a recent burst of star formation. Low metallicity alone cannot explain this tendency.

Accepted for publication in A&A. In v2 replaced graphs with higher quality PDF versions

References in corpus (12)

• Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
• Long gamma-ray bursts and core-collapse supernovae have different environments
• Pulsational Pair-Instability Supernovae
• Pulsational pair instability as an explanation for the most luminous supernovae
• The Structures of Distant Galaxies I: Galaxy Structures and the Merger Rate to z~3 in the Hubble Ultra-Deep Field
• Discovery of the nearby long, soft GRB 100316D with an associated supernova
• Spectroscopy of superluminous supernova host galaxies. A preference of hydrogen-poor events for extreme emission line galaxies
• The optically unbiased GRB host (TOUGH) survey. I. Survey design and catalogs
• TiNy Titans: The Role of Dwarf-Dwarf Interactions in the Evolution of Low Mass Galaxies
• Hydrogen-Poor Superluminous Supernovae from the Pan-STARRS1 Medium Deep Survey
• Zooming In on the Progenitors of Superluminous Supernovae With the HST
• On the early-time excess emission in hydrogen-poor superluminous supernovae

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• A puzzle solved after two decades: SN 2002gh among the brightest of superluminous supernovae
• Eruptive mass loss less than a year before the explosion of superluminous supernovae: I. The cases of SN 2020xga and SN 2022xgc
• Optical Observations and Modeling of the Superluminous Supernova 2018lfe
• Two years of optical and NIR observations of the superluminous supernova UID 30901 discovered by the UltraVISTA SN survey