V1309 Sco: Understanding a merger
Persistent URL
Author(s)
Nandez, Jose L. A.
Ivanova, Natalia
Lombardi, James C., Jr. (Jamie)
Date Issued
May 1, 2014
Abstract
One of the two outcomes of a common envelope (CE) event is a merger of the two stars. To date, the best known case of a binary merger is the V1309 Sco outburst, where the orbital period was known and observed to decay up to the outburst. Using the hydrodynamical code StarSmasher, we study in detail which characteristics of the progenitor binary affect the outburst and produce the best match with observations. We have developed a set of tools in order to quantify any CE event. We consider binaries consisting of a 1.52M(circle dot) giant and a 0.16M(circle dot) companion with P-orb similar to 1.4 days, varying the nature of the companion and its synchronization. We show that all considered progenitor binaries evolve toward the merger primarily because of Darwin instability. The merger is accompanied by mass ejection that proceeds in several separate mass outbursts and takes away a few percent of the donor mass. This very small mass, nonetheless, is important as it is not only sufficient to explain the observed light curve, but it also carries away up to one-third of both the initial total angular momentum and initial orbital energy. We find that all synchronized systems experience L-2 mass loss that operates during just a few days prior to the merger and produces ring-shaped ejecta. The formed star is always a strongly heated radiative star that differentially rotates. We conclude that the case of a synchronized binary with a main-sequence companion gives the best match with observations of V1309 Sco.
Journal
Astrophysical Journal
Department
Physics
Citation
Nandez, J. L. A., N. Ivanova, and J. C. Lombardi Jr. 2014. "V1309 Sco: Understanding a merger." Astrophysical Journal 786, no. 1 (May 1): 39.
Publisher
IOP
Version of Article
Published article
DOI
10.1088/0004-637X/786/1/39
ISSN
0004-637X
1538-4357
Rights
Copyright, 2014. The American Astronomical Society. All rights reserved.
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