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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Multi-wavelength observations of supernova 2011ei: Time-dependent classification of type IIb and Ib supernovae and implications for their progenitors
Astrophysical Journal, Volume 767, No. 1, Article 71, Year 2013
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Description
We present X-ray, UV/optical, and radio observations of the stripped-envelope, core-collapse supernova (SN) 2011ei, one of the least luminous SNe IIb or Ib observed to date. Our observations begin with a discovery within 1 day of explosion and span several months afterward. Early optical spectra exhibit broad, Type II-like hydrogen Balmer profiles that subside rapidly and are replaced by Type Ib-like He-rich features on a timescale of one week. High-cadence monitoring of this transition suggests absorption attributable to a high-velocity (≳ 12, 000 km s-1) H-rich shell, which is likely present in many Type Ib events. Radio observations imply a shock velocity of v 0.13 c and a progenitor star average mass-loss rate of (assuming wind velocity vw = 103 km s-1). This is consistent with independent constraints from deep X-ray observations with Swift-XRT and Chandra. Overall, the multi-wavelength properties of SN 2011ei are consistent with the explosion of a lower-mass (3-4 M), compact (R* ≲ 1 × 1011 cm), He-core star. The star retained a thin hydrogen envelope at the time of explosion, and was embedded in an inhomogeneous circumstellar wind suggestive of modest episodic mass loss. We conclude that SN 2011ei's rapid spectral metamorphosis is indicative of time-dependent classifications that bias estimates of the relative explosion rates for Type IIb and Ib objects, and that important information about a progenitor star's evolutionary state and mass loss immediately prior to SN explosion can be inferred from timely multi-wavelength observations. © 2013. The American Astronomical Society. All rights reserved..
Authors & Co-Authors
Milisavljevic, Danny
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Margutti, Raffaella A.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Soderberg, Alicia M.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Pignata, Giuliano
Chile, Santiago
Universidad Andrés Bello
Chomiuk, Laura B.
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
United States, Socorro
National Radio Astronomy Observatory Socorro
Fesen, Robert A.
United States, Hanover
Dartmouth College
Bufano, Filomena
Chile, Santiago
Universidad Andrés Bello
Sanders, Nathan Edward
United States, Cambridge
Harvard-smithsonian Center for Astrophysics
Parrent, Jerod T.
United States, Hanover
Dartmouth College
United States, Santa Barbara
Las Cumbres Observatory Global Telescope Network, Inc
Parker, Stuart
New Zealand, Canterbury
Parkdale Observatory
Mazzali, Paolo A.
Germany, Garching Bei Munchen
Max Planck Institute for Astrophysics
Italy, Padua
Osservatorio Astronomico Di Padova
United States, Santa Barbara
Kavli Institute for Theoretical Physics
Pian, Elena
United States, Santa Barbara
Kavli Institute for Theoretical Physics
Italy, Trieste
Osservatorio Astronomico Di Trieste
Italy, Pisa
Scuola Normale Superiore Di Pisa
Pickering, Timothy E.
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Cape Town
Southern African Large Telescope
Buckley, David A.H.
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Cape Town
Southern African Large Telescope
Crawford, Steven M.
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Cape Town
Southern African Large Telescope
Sickafoose, A. A.
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Cape Town
Southern African Large Telescope
Hettlage, Christian
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Cape Town
Southern African Large Telescope
Hooper, Eric J.
United States, Madison
University of Wisconsin-madison
Nordsieck, Kenneth H.
United States, Madison
University of Wisconsin-madison
O'Donoghue, Darragh E.
South Africa, Cape Town
Southern African Large Telescope
Husser, Tim Oliver
Germany, Gottingen
Georg-august-universität Göttingen
Potter, Stephen B.
South Africa, Cape Town
South African Astronomical Observatory
Kniazev, Alexei Yu
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Cape Town
Southern African Large Telescope
Kotzé, Paul P.A.
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Cape Town
Southern African Large Telescope
Romero-Colmenero, Encarnacion
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Cape Town
Southern African Large Telescope
Väisänen, Petri S.M.
South Africa, Cape Town
South African Astronomical Observatory
South Africa, Cape Town
Southern African Large Telescope
Wolf, Marsha J.
United States, Madison
University of Wisconsin-madison
Bietenholz, Michael F.
Canada, Toronto
York University
South Africa, Krugersdorp
Hartebeesthoek Radio Astronomy Observatory
Bartel, Norbert
Canada, Toronto
York University
Fransson, Claes
Sweden, Stockholm
Stockholms Universitet
Walker, Emma S.
Italy, Pisa
Scuola Normale Superiore Di Pisa
Brunthaler, Andreas
United States, Socorro
National Radio Astronomy Observatory Socorro
Germany, Bonn
Max Planck Institute for Radio Astronomy
Chakraborti, Sayan
India, Mumbai
Tata Institute of Fundamental Research, Mumbai
Levesque, Emily M.
United States, Boulder
University of Colorado Boulder
MacFadyen, Andrew I.
United States, New York
New York University
Drescher, Colin
Unknown Affiliation
Bock, G.
Australia
Windaroo Lakes Observatory
Marples, P.
Australia
Loganholme Observatory
Anderson, Joseph P.
Chile, Santiago
Universidad de Chile
Benetti, Stefano
Italy, Padua
Osservatorio Astronomico Di Padova
Reichart, Daniel E.
United States, Chapel Hill
The University of North Carolina at Chapel Hill
Ivarsen, Kevin M.
United States, Chapel Hill
The University of North Carolina at Chapel Hill
Statistics
Citations: 60
Authors: 42
Affiliations: 26
Identifiers
Doi:
10.1088/0004-637X/767/1/71
ISSN:
0004637X
e-ISSN:
15384357