Affiliation:
1. School of Physics and Astronomy, Monash University, Victoria 3800, Australia
2. Faculty of Information Technology, Monash University, Victoria 3800, Australia
Abstract
ABSTRACT
Observations of stellar remnants linked to Type Ia and Type Iax supernovae are necessary to fully understand their progenitors. Multiple progenitor scenarios predict a population of kicked donor remnants and partially burnt primary remnants, both moving with relatively high velocity. But only a handful of examples consistent with these two predicted populations have been observed. Here we report the likely first known example of an unbound white dwarf that is consistent with being the fully cooled primary remnant to a Type Iax supernova. The candidate, LP 93-21, is travelling with a galactocentric velocity of $v_{\textrm {gal}} \simeq 605\, {\rm km}\, {\rm s}^{-1}$, and is gravitationally unbound to the Milky Way. We rule out an extragalactic origin. The Type Iax supernova ejection scenario is consistent with its peculiar unbound trajectory, given anomalous elemental abundances are detected in its photosphere via spectroscopic follow-up. This discovery reflects recent models that suggest stellar ejections likely occur often. Unfortunately the intrinsic faintness of white dwarfs, and the uncertainty associated with their direct progenitor systems, makes it difficult to detect and confirm such donors.
Funder
University College Dublin
Monash University
University of California
University of Oklahoma
Australian Research Council
National Aeronautics and Space Administration
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
European Space Agency
Alfred P. Sloan Foundation
U.S. Department of Energy
University of Utah
Carnegie Mellon University
Johns Hopkins University
University of Tokyo
Lawrence Berkeley National Laboratory
New Mexico State University
New York University
University of Notre Dame
Pennsylvania State University
Universidad Nacional Autónoma de México
University of Arizona
University of Colorado Boulder
University of Oxford
University of Portsmouth
University of Virginia
University of Washington
Vanderbilt University
Yale University
Publisher
Oxford University Press (OUP)
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
7 articles.
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