Analysis of Two Eclipsing Hot Subdwarf Binaries with a Low Mass Stellar and a Brown Dwarf Companion

Schaffenroth, V.; Geier, S.; Heber, U.; Drechsel, H.; O̸stensen, Roy H.; Maxted, P. F. L.; Kupfer, Thomas; Barlow, B. N.

doi:10.1063/1.3556199

AIP Conference Proceedings

2011

DOI: 10.1063/1.3556199

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Analysis of Two Eclipsing Hot Subdwarf Binaries with a Low Mass Stellar and a Brown Dwarf Companion

V. Schaffenroth¹,

S. Geier²,

U. Heber³

et al.

Abstract: Abstract. The formation of hot subdwarf stars (sdBs), which are core helium-burning stars located on the extended horizontal branch, is still not understood. Many of the known hot subdwarf stars reside in close binary systems with short orbital periods between a few hours and a few days with either M star or white dwarf companions. Common envelope ejection is the most probable formation channel. Among these, eclipsing systems are of special importance because it is possible to constrain the parameters of both … Show more

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The quest for stable circumbinary companions to post-common envelope sdB eclipsing binaries

Pulley

Faillace

Smith

et al. 2018

A&A

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Context. Period variations have been detected in a number of eclipsing close compact binary subdwarf B stars (sdBs) and these have often been interpreted as caused by circumbinary massive planets or brown dwarfs. According to canonical binary models, the majority of sdB systems are produced from low mass stars with degenerate cores where helium is ignited in flashes. Various evolutionary scenarios have been proposed for these stars, but a definite mechanism remains to be established. Equally puzzling is the formation of these putative circumbinary objects which must have formed either from the remaining post common envelope circumbinary disk or survived its evolution. Aims. In this paper we review the eclipse time variations (ETVs) exhibited by seven such systems (EC10246-2707, HS0705+6700, HS2231+2441, J08205+0008, NSVS 07826147, NSVS 14256825 and NY Vir) and explore if there is conclusive evidence that the ETVs observed over the last two decades can reliably predict the presence of one or more circumbinary bodies. Methods. We report 246 new observations of the seven sdB systems made between 2013 September and 2017 July using a worldwide network of telescopes. We combined our new data with previously published measurements to analyse the ETVs of these systems. Results. Our data shows that period variations cannot be modelled simply on the basis of circumbinary objects. This implies that more complex processes may be taking place in these systems. These difficulties are compounded by the secondary star not being spectroscopically visible. From eclipse time variations, it has historically been suggested that five of the seven binary systems reported herein had circumbinary objects. Based on our recent observations and analysis only three systems remain serious contenders. We find agreement with other observers that at least a decade of observations is required to establish reliable ephemeris. With longer observational baselines it is quite conceivable that the data will support the circumbinary object hypothesis of these binary systems. Also we generally agree with other observers that larger values of (O-C) residuals are found with secondary companions of spectral type M5/6 or earlier possibly as a result of an Applegate type mechanism

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The quest for stable circumbinary companions to post-common envelope sdB eclipsing binaries

Pulley

Faillace

Smith

et al. 2018

A&A

View full text Add to dashboard Cite

show abstract

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Analysis of Two Eclipsing Hot Subdwarf Binaries with a Low Mass Stellar and a Brown Dwarf Companion

Cited by 1 publication

References 2 publications

The quest for stable circumbinary companions to post-common envelope sdB eclipsing binaries

The quest for stable circumbinary companions to post-common envelope sdB eclipsing binaries

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