A helium nova in the Large Magellanic Cloud – the faint supersoft X-ray source [HP99]159-Reference-Cited by-同舟云学术

A helium nova in the Large Magellanic Cloud – the faint supersoft X-ray source [HP99]159

Published:2023-07-04 Issue:1 Volume:525 Page:L56-L59
ISSN:1745-3925
Container-title:Monthly Notices of the Royal Astronomical Society: Letters
language:en
Short-container-title:

Author:

Kato Mariko¹,Hachisu Izumi²,Saio Hideyuki³

Affiliation:

1. Department of Astronomy, Keio University , Hiyoshi, Kouhoku-ku, Yokohama 223-8521 , Japan

2. Department of Earth Science and Astronomy, College of Arts and Sciences, The University of Tokyo , 3-8-1 Komaba, Meguro-ku, Tokyo 153-8902 , Japan

3. Astronomical Institute, Graduate School of Science, Tohoku University , Sendai 980-8578 , Japan

Abstract

ABSTRACT We propose a helium nova model for the Large Magellanic Cloud (LMC) supersoft X-ray source (SSS) [HP99]159. This object has long been detected as a faint and persistent SSS for about 30 yr, and recently been interpreted to be a source of steady helium-shell burning, because no hydrogen lines are observed. We find that the object can also be interpreted as in a decaying phase of a helium nova. The helium nova is slowly decaying toward the quiescent phase, during which the observed temperature, luminosity, and SSS lifetime (≳30 yr) are consistent with a massive white dwarf model of ∼1.2 M⊙. If it is the case, this is the second discovery of a helium nova outburst after V445 Pup in our Galaxy, and also the first identified helium nova in the LMC. We also discuss the nature of the companion helium star in relation to Type Ia supernova progenitors.

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Link

https://academic.oup.com/mnrasl/advance-article-pdf/doi/10.1093/mnrasl/slad096/50895827/slad096.pdf

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