A hundred new eclipsing binary system candidates studied in a near-infrared window in the VVV survey

L. V. Gramajo, T. Palma, D. Minniti, R. K. Saito, J. J. Clariá, R. Kammers, F. Surot

Research output: Contribution to journalReview articlepeer-review

Abstract

We present the first results obtained from an extensive study of eclipsing binary (EB) system candidates recently detected in the VISTA Variables in the Viá Láctea (VVV) near-infrared (NIR) Survey. We analyse the VVV tile d040 in the southern part of the Galactic disc wherein the interstellar reddening is comparatively low, which makes it possible to detect hundreds of new EB candidates. We present here the light curves and the determination of the geometric and physical parameters of the best candidates found in this 'NIR window', including 37 contact, 50 detached, and 13 semi-detached EB systems. We infer that the studied systems have an average of the <![CDATA[ $K_s$[]> amplitudes of <![CDATA[ $0.8$[]> mag and a median period of 1.22 days where, in general, contact binaries have shorter periods. Using the 'Physics Of Eclipsing Binaries' (PHOEBE) interactive interface, which is based on the Wilson and Devinney code, we find that the studied systems have low eccentricities. The studied EBs present mean values of about 5 700 and 4 900 K for the <![CDATA[ $T_1$[]> and <![CDATA[ $T_2$[]> components, respectively. The mean mass ratio (q) for the contact EB stars is <![CDATA[ $\sim$[]> 0.44. This new galactic disk sample is a first look at the massive study of NIR EB systems.

Original languageEnglish
Article numbere054
JournalPublications of the Astronomical Society of Australia
DOIs
Publication statusAccepted/In press - 2020

Keywords

  • binaries: Eclipsing
  • Infrared: Stars
  • Keywords:

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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