New NSVS 14256825 eclipse times Virtual Observatory Resource

Authors
  1. Nasiroglu I.
  2. Gozdziewski K.
  3. Slowikowska A.
  4. Krzeszowski K.
  5. Zejmo M.,Zola S.
  6. Er H.
  7. Ogloza W.
  8. Drozdz M.
  9. Koziel-Wierzbowska D.
  10. Debski B.,Karaman N.
  11. Published by
    CDS
Abstract

The cyclic behavior of (O-C) residuals of eclipse timings in the sdB+M eclipsing binary NSVS 14256825 was previously attributed to one or two Jovian-type circumbinary planets. We report 83 new eclipse timings that not only fill in the gaps in those already published but also extend the time span of the (O-C) diagram by three years. Based on the archival and our new data spanning over more than 17 years, we re-examined the up-to-date system (O-C). The data revealed a systematic, quasi-sinusoidal variation deviating from an older linear ephemeris by about 100 s. It also exhibits a maximum in the (O-C) near JD 2456400 that was previously unknown. We consider two most credible explanations of the (O-C) variability: the light propagation time due to the presence of an invisible companion in a distant circumbinary orbit, and magnetic cycles reshaping one of the binary components, known as the Applegate or Lanza-Rodono effect. We found that the latter mechanism is unlikely due to the insufficient energy budget of the M-dwarf secondary. In the framework of the third-body hypothesis, we obtained meaningful constraints on the Keplerian parameters of a putative companion and its mass. Our best-fitting model indicates that the observed quasi-periodic (O-C) variability can be explained by the presence of a brown dwarf with the minimal mass of 15 Jupiter masses rather than a planet, orbiting the binary in a moderately elliptical orbit (e~0.175) with a period of ~10 years. Our analysis rules out the two-planet model proposed earlier.

Keywords
  1. Eclipsing binary stars
  2. Subdwarf stars
  3. Exoplanets
Bibliographic source Bibcode
2017AJ....153..137N
See also HTML
https://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/153/137
IVOA Identifier IVOID
ivo://CDS.VizieR/J/AJ/153/137
Document Object Identifer DOI
doi:10.26093/cds/vizier.51530137

Access

Web browser access HTML
http://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/153/137
https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/153/137
http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/153/137
IVOA Table Access TAP
http://tapvizier.cds.unistra.fr/TAPVizieR/tap
Run SQL-like queries with TAP-enabled clients (e.g., TOPCAT).

History

2018-05-14T08:14:42Z
Resource record created
2018-05-14T08:14:42Z
Created
2018-09-18T13:40:02Z
Updated

Contact

Name
CDS support team
Postal Address
CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France
E-Mail
cds-question@unistra.fr