Supernova Interaction with a Dense Detached Shell in SN 2001em

Abstract

We carry out a comprehensive analysis of supernova \snem\ covering a period of 19 years since discovery. SN 2001em is the oldest supernova known to have undergone a metamorphosis from a stripped envelope to an interacting supernova. An early spectrum indicates it exploded as a Type Ib supernova. Later, the ejecta caught up with a dense circumstellar H-shell, ejected a few thousand years before the explosion, triggering interaction between the supernova ejecta and the dense shell, producing radio, X-ray and H$\alpha$ emission. We use archival data with the Very Large Array in radio bands and with Chandra, XMM-NEWTON and SWIFT-XRT in X-ray bands, along with published H$\alpha$ measurements. We combine these data with our low radio frequency observations with the Giant Metrewave Radio Telescope at two epochs covering three frequencies. While the observations missed the phase when the shock entered the dense shell, the X-rays indicate that the shock came out of the dense shell at around 1750 days. The data suggest a forward shock origin of the X-ray emission. Radio data show a spectral inversion at late epochs ($>5000$\,d) at around 3 GHz, which mimics the properties of the central absorbed component seen in SN 1986J. A possible explanation for this component is that the progenitor of \snem\ was a massive binary system which had undergone a period of common envelope evolution. The hydrogen envelope from the \snem\ progenitor may have been lost as a result of binary interaction.

arXiv commentAccepted for publication in ApJ

References in corpus (53)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• emcee: The MCMC Hammer
• Mass Loss: Its Effect on the Evolution and Fate of High-Mass Stars
• Mass loss from hot massive stars
• A giant outburst two years before the core-collapse of a massive star
• On the role of continuum-driven eruptions in the evolution of very massive stars and Population III stars
• SN 2006jc: A Wolf-Rayet Star Exploding in a Dense He-Rich Circumstellar Medium
• A panchromatic view of the restless SN2009ip reveals the explosive ejection of a massive star envelope
• Common Envelope Evolution Leading to Supernovae with Dense Interaction
• Setting the Stage for Circumstellar Interaction in Core-Collapse Supernovae II: Wave-Driven Mass Loss in Supernova Progenitors
• The Spectral SN-GRB Connection: Systematic Spectral Comparisons between Type Ic Supernovae, and broad-lined Type Ic Supernovae with and without Gamma-Ray Bursts
• Ejection of the massive Hydrogen-rich envelope timed with the collapse of the stripped SN2014C
• Interacting Supernovae: Types IIn and Ibn
• The Evolution of Supernovae in Circumstellar Wind-Blown Bubbles I. Introduction and One-Dimensional Calculations
• SN 2010jl: Optical to hard X-ray observations reveal an explosion embedded in a ten solar mass cocoon
• Metamorphosis of SN 2014C: Delayed Interaction Between a Hydrogen Poor Core-collapse Supernova and a Nearby Circumstellar Shell
• SN 2005bf: A Possible Transition Event Between Type Ib/c Supernovae and Gamma Ray Bursts
• What are Published X-ray lightcurves telling us about Young Supernova Expansion?
• Thermal and non-thermal emission from circumstellar interaction
• Numerical models of collisions between core-collapse supernovae and circumstellar shells
• X-ray and radio emission from Type IIn supernova SN 2010jl
• Late Emission from the Type Ib/c SN 2001em: Overtaking the Hydrogen Envelope
• An Imaging and Spectroscopic Survey of Galaxies within Prominent Nearby Voids. II. Morphologies, Star Formation and Faint Companions
• Radio and X-ray observations of SN 2006jd: Another strongly interacting Type IIn supernova
• The Berkeley Sample of Stripped-Envelope Supernovae
• Explosions Driven by the Coalescence of a Compact Object with the Core of a Massive-Star Companion Inside a Common Envelope: Circumstellar Properties, Light Curves, and Population Statistics
• X-Rays from Supernova Shocks in Dense Mass Loss
• Light-echoes from the plateau in Eta Carinae's Great Eruption reveal a two-stage shock-powered event
• Radio Observations Reveal Unusual Circumstellar Environments for Some Type Ibc Supernova Progenitors
• Supernova 1996cr: SN 1987A's Wild Cousin?
• The peculiar type Ib supernova 2005bf: explosion of a massive He star with a thin hydrogen envelope?
• Radio Emission from SN 1988Z and Very Massive Star Evolution
• SN 2017ens: The Metamorphosis of a Luminous Broad-lined Type Ic Supernova into an SN IIn
• Stripped-envelope supernova SN 2004dk is now interacting with hydrogen-rich circumstellar material
• A Comprehensive Analysis of Spitzer Supernovae
• FLAGCAL:A flagging and calibration package for radio interferometric data
• Bursting SN 1996cr's Bubble: Hydrodynamic and X-ray Modeling of its Circumstellar Medium
• X-ray Emission from SN 2012ca: A Type Ia-CSM Supernova Explosion in a Dense Surrounding Medium
• The Case for a Misaligned Relativistic Jet from SN 2001em
• Circumstellar interaction in supernovae in dense environments - an observational perspective
• Discovery of X-Ray Emission from Supernova 1970G with Chandra: Filling the Void between Supernovae and Supernova Remnants
• Giant Metrewave Radio Telescope monitoring of the black hole X-ray binary, V404 Cygni, during its June 2015 outburst
• A Chandra ACIS Observation of the X-ray Luminous SN1988Z
• The luminous and rapidly evolving SN 2018bcc: Clues toward the origin of Type Ibn SNe from the Zwicky Transient Facility
• Against the Wind: Radio Light Curves of Type Ia Supernovae Interacting with Low-Density Circumstellar Shells
• Interaction of SN~Ib 2004dk with a Previously-Expelled Envelope
• SN 2012ca: a stripped envelope core-collapse SN interacting with dense circumstellar medium
• An Upper Limit on the Expansion Velocity of GRB Candidate SN 2001em
• SN 2001em: No Jet-Driven Gamma Ray Burst Event
• SN 1986J VLBI. IV. The Nature of the Central Component
• Searching for the expelled hydrogen envelope in Type I supernovae via late-time H-alpha emission
• A study of spectral curvature in the radio relic in Abell 4038 using the uGMRT
• VLBI Constraints on Type I b/c Supernovae

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