Where are the double-degenerate progenitors of Type Ia supernovae?
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Cita com:
hdl:2117/167834
Tipus de documentArticle
Data publicació2019-01-01
EditorOxford University Press
Condicions d'accésAccés obert
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continguts d'aquesta obra estan subjectes a la llicència de Creative Commons
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Reconeixement-NoComercial-SenseObraDerivada 3.0 Espanya
ProjecteDEL ENFRIAMIENTO A LAS EXPLOSIONES: LA FISICA DE LOS OBJETOS COMPACTOS (AEI-AYA2017-86274-P)
Abstract
Double white dwarf binaries with merger timescales smaller than the Hubble time and
with a total mass near the Chandrasekhar limit (i.e. classical Chandrasekhar population) or with high-mass primaries (i.e. sub-Chandrasekhar population) are potential
supernova type Ia (SNIa) progenitors. However, we have not yet unambiguously confirmed the existence of these objects observationally, a fact that has been often used to
criticise the relevance of double white dwarfs for producing SNIa. We analyse whether
this lack of detections is due to observational effects. To that end we simulate the
double white dwarf binary population in the Galaxy and obtain synthetic spectra for
the SNIa progenitors. We demonstrate that their identification, based on the detection of Ha double-lined profiles arising from the two white dwarfs in the synthetic
spectra, is extremely challenging due to their intrinsic faintness. This translates into
an observational probability of finding double white dwarf SNIa progenitors in the
Galaxy of (2.1 ± 1.0) × 10-5 and (0.8 ± 0.4) × 10-5
for the classical Chandrasekhar and
the sub-Chandrasekhar progenitor populations, respectively. Eclipsing double white
dwarf SNIa progenitors are found to suffer from the same observational effect. The
next generation of large-aperture telescopes are expected to help in increasing the
probability for detection by ~1 order of magnitude. However, it is only with forthcoming observations such as those provided by LISA that we expect to unambiguously
confirm or disprove the existence of double white dwarf SNIa progenitors and to test
their importance for producing SNIa.
CitacióRebassa, A. [et al.]. Where are the double-degenerate progenitors of Type Ia supernovae?. "Monthly notices of the Royal Astronomical Society", 1 Gener 2019, vol. 482, núm. 3, p. 3656-3668.
ISSN0035-8711
Versió de l'editorhttps://academic.oup.com/mnras/article-abstract/482/3/3656/5159486
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DDSNIa.pdf | Main Article | 7,500Mb | Visualitza/Obre |