Why are supersoft X-ray fluxes so weak in early-type galaxies? - A clue to type Ia SNe progenitors -

Mariko Kato

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Supersoft X-ray fluxes in early-type galaxies provide an excellent test for Type Ia supernovae (SNe Ia) progenitors: the double degenerate (DD) scenario is believed to produce no supersoft sources (SSSs) except just before the SN Ia explosion, while the single degenerate (SD) scenario produces SSSs in some phases of the symbiotic channel. Recent observations of the supersoft X-ray flux of early-type galaxies show a remarkable agreement with theoretical predictions of the SD scenario, which thus turns out to be a strong support for the SD scenario, despite the original observations aimed at the opposite conclusion. Here I explain why X-ray fluxes are so weak in early-type galaxies. (1) Candidate binaries in the SD scenario become SSSs only during a short time on their way to SNe Ia explosions, because they spend a large part of their lifetime in a wind phase. (2) During the SSS phase, symbiotic stars emit very weak supersoft X-ray fluxes even if the WD is very massive. It should be emphasized that supersoft X-ray symbiotic stars are very rare and we need more observations to understand their nature.

Original languageEnglish
Title of host publicationProceedings of the International Astronomical Union
Pages145-148
Number of pages4
Volume7
EditionS281
DOIs
Publication statusPublished - 2011 Jul

Publication series

NameProceedings of the International Astronomical Union
NumberS281
Volume7
ISSN (Print)17439213
ISSN (Electronic)17439221

Fingerprint

galaxies
symbiotic stars
x rays
explosions
supernovae
life (durability)
predictions

Keywords

  • Binaries: symbiotic - stars: novae
  • Cataclysmic variables
  • Late-type
  • Mass loss
  • Stars
  • Supernovae - X-rays: galaxies
  • White dwarfs

ASJC Scopus subject areas

  • Astronomy and Astrophysics

Cite this

Kato, M. (2011). Why are supersoft X-ray fluxes so weak in early-type galaxies? - A clue to type Ia SNe progenitors -. In Proceedings of the International Astronomical Union (S281 ed., Vol. 7, pp. 145-148). (Proceedings of the International Astronomical Union; Vol. 7, No. S281). https://doi.org/10.1017/S1743921312014895

Why are supersoft X-ray fluxes so weak in early-type galaxies? - A clue to type Ia SNe progenitors -. / Kato, Mariko.

Proceedings of the International Astronomical Union. Vol. 7 S281. ed. 2011. p. 145-148 (Proceedings of the International Astronomical Union; Vol. 7, No. S281).

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Kato, M 2011, Why are supersoft X-ray fluxes so weak in early-type galaxies? - A clue to type Ia SNe progenitors -. in Proceedings of the International Astronomical Union. S281 edn, vol. 7, Proceedings of the International Astronomical Union, no. S281, vol. 7, pp. 145-148. https://doi.org/10.1017/S1743921312014895
Kato M. Why are supersoft X-ray fluxes so weak in early-type galaxies? - A clue to type Ia SNe progenitors -. In Proceedings of the International Astronomical Union. S281 ed. Vol. 7. 2011. p. 145-148. (Proceedings of the International Astronomical Union; S281). https://doi.org/10.1017/S1743921312014895
Kato, Mariko. / Why are supersoft X-ray fluxes so weak in early-type galaxies? - A clue to type Ia SNe progenitors -. Proceedings of the International Astronomical Union. Vol. 7 S281. ed. 2011. pp. 145-148 (Proceedings of the International Astronomical Union; S281).
@inproceedings{81ed3caaed9e47ceaa4c463743c1588d,
title = "Why are supersoft X-ray fluxes so weak in early-type galaxies? - A clue to type Ia SNe progenitors -",
abstract = "Supersoft X-ray fluxes in early-type galaxies provide an excellent test for Type Ia supernovae (SNe Ia) progenitors: the double degenerate (DD) scenario is believed to produce no supersoft sources (SSSs) except just before the SN Ia explosion, while the single degenerate (SD) scenario produces SSSs in some phases of the symbiotic channel. Recent observations of the supersoft X-ray flux of early-type galaxies show a remarkable agreement with theoretical predictions of the SD scenario, which thus turns out to be a strong support for the SD scenario, despite the original observations aimed at the opposite conclusion. Here I explain why X-ray fluxes are so weak in early-type galaxies. (1) Candidate binaries in the SD scenario become SSSs only during a short time on their way to SNe Ia explosions, because they spend a large part of their lifetime in a wind phase. (2) During the SSS phase, symbiotic stars emit very weak supersoft X-ray fluxes even if the WD is very massive. It should be emphasized that supersoft X-ray symbiotic stars are very rare and we need more observations to understand their nature.",
keywords = "Binaries: symbiotic - stars: novae, Cataclysmic variables, Late-type, Mass loss, Stars, Supernovae - X-rays: galaxies, White dwarfs",
author = "Mariko Kato",
year = "2011",
month = "7",
doi = "10.1017/S1743921312014895",
language = "English",
isbn = "9781107019812",
volume = "7",
series = "Proceedings of the International Astronomical Union",
number = "S281",
pages = "145--148",
booktitle = "Proceedings of the International Astronomical Union",
edition = "S281",

}

TY - GEN

T1 - Why are supersoft X-ray fluxes so weak in early-type galaxies? - A clue to type Ia SNe progenitors -

AU - Kato, Mariko

PY - 2011/7

Y1 - 2011/7

N2 - Supersoft X-ray fluxes in early-type galaxies provide an excellent test for Type Ia supernovae (SNe Ia) progenitors: the double degenerate (DD) scenario is believed to produce no supersoft sources (SSSs) except just before the SN Ia explosion, while the single degenerate (SD) scenario produces SSSs in some phases of the symbiotic channel. Recent observations of the supersoft X-ray flux of early-type galaxies show a remarkable agreement with theoretical predictions of the SD scenario, which thus turns out to be a strong support for the SD scenario, despite the original observations aimed at the opposite conclusion. Here I explain why X-ray fluxes are so weak in early-type galaxies. (1) Candidate binaries in the SD scenario become SSSs only during a short time on their way to SNe Ia explosions, because they spend a large part of their lifetime in a wind phase. (2) During the SSS phase, symbiotic stars emit very weak supersoft X-ray fluxes even if the WD is very massive. It should be emphasized that supersoft X-ray symbiotic stars are very rare and we need more observations to understand their nature.

AB - Supersoft X-ray fluxes in early-type galaxies provide an excellent test for Type Ia supernovae (SNe Ia) progenitors: the double degenerate (DD) scenario is believed to produce no supersoft sources (SSSs) except just before the SN Ia explosion, while the single degenerate (SD) scenario produces SSSs in some phases of the symbiotic channel. Recent observations of the supersoft X-ray flux of early-type galaxies show a remarkable agreement with theoretical predictions of the SD scenario, which thus turns out to be a strong support for the SD scenario, despite the original observations aimed at the opposite conclusion. Here I explain why X-ray fluxes are so weak in early-type galaxies. (1) Candidate binaries in the SD scenario become SSSs only during a short time on their way to SNe Ia explosions, because they spend a large part of their lifetime in a wind phase. (2) During the SSS phase, symbiotic stars emit very weak supersoft X-ray fluxes even if the WD is very massive. It should be emphasized that supersoft X-ray symbiotic stars are very rare and we need more observations to understand their nature.

KW - Binaries: symbiotic - stars: novae

KW - Cataclysmic variables

KW - Late-type

KW - Mass loss

KW - Stars

KW - Supernovae - X-rays: galaxies

KW - White dwarfs

UR - http://www.scopus.com/inward/record.url?scp=84872689502&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84872689502&partnerID=8YFLogxK

U2 - 10.1017/S1743921312014895

DO - 10.1017/S1743921312014895

M3 - Conference contribution

AN - SCOPUS:84872689502

SN - 9781107019812

VL - 7

T3 - Proceedings of the International Astronomical Union

SP - 145

EP - 148

BT - Proceedings of the International Astronomical Union

ER -