Optical, near-IR and $X$-ray observations of SN 2015J and its host galaxy

Abstract

SN 2015J was discovered on April 27th 2015 and is classified as a type IIn supernova. At first, it appeared to be an orphan SN candidate, i.e. without any clear identification of its host galaxy. Here, we present the analysis of the observations carried out {by the VLT 8-m class telescope with the FORS2 camera in the R band and the Magellan telescope (6.5 m) equipped with the IMACS Short-Camera (V and I filters) and the FourStar camera (Ks filter)}. We show that SN 2015J resides in what appears to be a very compact galaxy establishing a relation between the SN event and its natural host. We also present and discuss archival and new $X$-ray data centred on SN 2015J. At the time of the supernova explosion, Swift/XRT observations were made and a weak X-ray source was detected at the location of SN 2015J. Almost one year later, the same source was unambiguously identified during serendipitous observations by Swift/XRT and $XMM$-Newton, clearly showing an enhancement of the 0.3-10 keV band flux by a factor $\simeq 30$ with respect to the initial state. Swift/XRT observations show that the source is still active in the $X$-rays at a level of $\simeq 0.05$ counts s${}^{-1}$. The unabsorbed X-ray luminosity derived from the {\it XMM}-Newton slew and SWIFT observations, $L_x\simeq 5\times 10^{41}$ erg s${}^{-1}$, places SN 2015J among the brightest young supernovae in X-rays.

arXiv commentThe Astrophysical Journal, Volume 850, Number 2

References in corpus (24)

• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• The Swift X-ray Telescope
• Calibration of X-ray absorption in our Galaxy
• Hydrodynamical Simulations to Determine the Feeding Rate of Black Holes by the Tidal Disruption of Stars: The Importance of the Impact Parameter and Stellar Structure
• Discovery of an Unbound Hyper-Velocity Star in the Milky Way Halo
• The Wide Field Spectrograph (WiFeS)
• On the progenitor of SN 2005gl and the nature of Type IIn supernovae
• Supernova Light Curves Powered by Fallback Accretion
• The Superluminous Transient ASASSN-15lh as a Tidal Disruption Event from a Kerr Black Hole
• ASASSN-15lh: A Highly Super-Luminous Supernova
• Multi-wavelength Observations of the Enduring Type IIn Supernovae 2005ip and 2006jd
• MMT Hypervelocity Star Survey III: A Complete Survey of Faint B-type Stars in the Northern Milky Way Halo
• Absolute-Magnitude Distributions of Supernovae
• What are Published X-ray lightcurves telling us about Young Supernova Expansion?
• X-ray and radio emission from Type IIn supernova SN 2010jl
• Radio and X-ray observations of SN 2006jd: Another strongly interacting Type IIn supernova
• HIPASS Detection of an Intergalactic Gas Cloud in the NGC 2442 Group
• Strong Evolution of X-Ray Absorption in the Type IIn Supernova SN 2010jl
• X-rays from the location of the Bactrian Transient ASASSN-15lh
• Bursting SN 1996cr's Bubble: Hydrodynamic and X-ray Modeling of its Circumstellar Medium
• The Origins and Evolutionary Status of B Stars Found Far From the Galactic Plane II: Kinematics and Full Sample Analysis
• The SkyMapper Transient Survey
• Two Distinct-Absorption X-Ray Components from Type IIn Supernovae: Evidence for Asphericity in the Circumstellar Medium
• Supernovae without host galaxies? The low surface brightness host of SN 2009Z