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Title: THE ABSENCE OF EX-COMPANIONS IN TYPE Ia SUPERNOVA REMNANTS

Abstract

Type Ia supernovae (SNe Ia) play important roles in our study of the expansion and acceleration of the universe, but because we do not know the exact nature or natures of the progenitors, there is a systematic uncertainty that must be resolved if SNe Ia are to become more precise cosmic probes. No progenitor system has ever been identified either in the pre- or post-explosion images of a Ia event. There have been recent claims for and against the detection of ex-companion stars in several SNe Ia remnants. These studies, however, usually ignore the angular momentum gain of the progenitor white dwarf (WD), which leads to a spin-up phase and a subsequent spin-down phase before explosion. For spin-down timescales greater than 10{sup 5} years, the donor star could be too dim to detect by the time of explosion. Here we revisit the current limits on ex-companion stars to SNR 0509-67.5, a 400-year-old remnant in the Large Magellanic Cloud. If the effects of possible angular momentum gain on the WD are included, a wide range of single-degenerate progenitor models are allowed for this remnant. We demonstrate that the current absence of evidence for ex-companion stars in this remnant, as well asmore » other SNe Ia remnants, does not necessarily provide the evidence of absence for ex-companions. We discuss potential ways to identify such ex-companion stars through deep imaging observations.« less

Authors:
 [1];  [2]
  1. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
  2. Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, 440 West Brooks Street, Norman, OK 73019 (United States)
Publication Date:
OSTI Identifier:
22086435
Resource Type:
Journal Article
Journal Name:
Astrophysical Journal
Additional Journal Information:
Journal Volume: 759; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0004-637X
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATION; ACCRETION DISKS; ASTRONOMY; ASTROPHYSICS; DETECTION; GAIN; MAGELLANIC CLOUDS; SPIN; SUPERNOVA REMNANTS; SUPERNOVAE; UNIVERSE; WHITE DWARF STARS

Citation Formats

Di Stefano, R., and Kilic, Mukremin, E-mail: rd@cfa.harvard.edu, E-mail: kilic@ou.edu. THE ABSENCE OF EX-COMPANIONS IN TYPE Ia SUPERNOVA REMNANTS. United States: N. p., 2012. Web. doi:10.1088/0004-637X/759/1/56.
Di Stefano, R., & Kilic, Mukremin, E-mail: rd@cfa.harvard.edu, E-mail: kilic@ou.edu. THE ABSENCE OF EX-COMPANIONS IN TYPE Ia SUPERNOVA REMNANTS. United States. doi:10.1088/0004-637X/759/1/56.
Di Stefano, R., and Kilic, Mukremin, E-mail: rd@cfa.harvard.edu, E-mail: kilic@ou.edu. Thu . "THE ABSENCE OF EX-COMPANIONS IN TYPE Ia SUPERNOVA REMNANTS". United States. doi:10.1088/0004-637X/759/1/56.
@article{osti_22086435,
title = {THE ABSENCE OF EX-COMPANIONS IN TYPE Ia SUPERNOVA REMNANTS},
author = {Di Stefano, R. and Kilic, Mukremin, E-mail: rd@cfa.harvard.edu, E-mail: kilic@ou.edu},
abstractNote = {Type Ia supernovae (SNe Ia) play important roles in our study of the expansion and acceleration of the universe, but because we do not know the exact nature or natures of the progenitors, there is a systematic uncertainty that must be resolved if SNe Ia are to become more precise cosmic probes. No progenitor system has ever been identified either in the pre- or post-explosion images of a Ia event. There have been recent claims for and against the detection of ex-companion stars in several SNe Ia remnants. These studies, however, usually ignore the angular momentum gain of the progenitor white dwarf (WD), which leads to a spin-up phase and a subsequent spin-down phase before explosion. For spin-down timescales greater than 10{sup 5} years, the donor star could be too dim to detect by the time of explosion. Here we revisit the current limits on ex-companion stars to SNR 0509-67.5, a 400-year-old remnant in the Large Magellanic Cloud. If the effects of possible angular momentum gain on the WD are included, a wide range of single-degenerate progenitor models are allowed for this remnant. We demonstrate that the current absence of evidence for ex-companion stars in this remnant, as well as other SNe Ia remnants, does not necessarily provide the evidence of absence for ex-companions. We discuss potential ways to identify such ex-companion stars through deep imaging observations.},
doi = {10.1088/0004-637X/759/1/56},
journal = {Astrophysical Journal},
issn = {0004-637X},
number = 1,
volume = 759,
place = {United States},
year = {2012},
month = {11}
}