TY - JOUR
T1 - The Candidate Progenitor Companion Star of the Type Ib/c SN 2013ge
AU - Fox, Ori D.
AU - Van Dyk, Schuyler D.
AU - Williams, Benjamin F.
AU - Drout, Maria
AU - Zapartas, Emmanouil
AU - Smith, Nathan
AU - Milisavljevic, Dan
AU - Andrews, Jennifer E.
AU - Bostroem, K. Azalee
AU - Filippenko, Alexei V.
AU - Gomez, Sebastian
AU - Kelly, Patrick L.
AU - De Mink, S. E.
AU - Pierel, Justin
AU - Rest, Armin
AU - Ryder, Stuart
AU - Sravan, Niharika
AU - Strolger, Lou
AU - Wang, Qinan
AU - Weil, Kathryn E.
N1 - Publisher Copyright:
© 2022. The Author(s). Published by the American Astronomical Society.
PY - 2022/4/1
Y1 - 2022/4/1
N2 - This Letter presents the detection of a source at the position of the Type Ib/c supernova (SN) 2013ge more than four years after the radioactive component is expected to have faded. This source could mark the first post-SN direct detection of a surviving companion to a stripped-envelope Type Ib/c explosion. We test this hypothesis and find the shape of the source's spectral energy distribution is most consistent with that of a B5 I supergiant. While binary models tend to predict OB-type stars for stripped-envelope companions, the location of the source on a color-magnitude diagram places it redward of its more likely position on the main sequence (MS). The source may be temporarily out of thermal equilibrium, or a cool and inflated non-MS companion, which is similar to the suggested companion of Type Ib SN 2019yvr that was constrained from pre-SN imaging. We also consider other possible physical scenarios for the source, including a fading SN, circumstellar shock interaction, line-of-sight coincidence, and an unresolved host star cluster, all of which will require future observations to more definitively rule out. Ultimately, the fraction of surviving companions ("binary fraction") will provide necessary constraints on binary evolution models and the underlying physics.
AB - This Letter presents the detection of a source at the position of the Type Ib/c supernova (SN) 2013ge more than four years after the radioactive component is expected to have faded. This source could mark the first post-SN direct detection of a surviving companion to a stripped-envelope Type Ib/c explosion. We test this hypothesis and find the shape of the source's spectral energy distribution is most consistent with that of a B5 I supergiant. While binary models tend to predict OB-type stars for stripped-envelope companions, the location of the source on a color-magnitude diagram places it redward of its more likely position on the main sequence (MS). The source may be temporarily out of thermal equilibrium, or a cool and inflated non-MS companion, which is similar to the suggested companion of Type Ib SN 2019yvr that was constrained from pre-SN imaging. We also consider other possible physical scenarios for the source, including a fading SN, circumstellar shock interaction, line-of-sight coincidence, and an unresolved host star cluster, all of which will require future observations to more definitively rule out. Ultimately, the fraction of surviving companions ("binary fraction") will provide necessary constraints on binary evolution models and the underlying physics.
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U2 - 10.3847/2041-8213/ac5890
DO - 10.3847/2041-8213/ac5890
M3 - Article
AN - SCOPUS:85130142737
SN - 2041-8205
VL - 929
JO - Astrophysical Journal Letters
JF - Astrophysical Journal Letters
IS - 1
M1 - L15
ER -