Astron. J., 153, 137-137 (2017/March-0)
Is there a circumbinary planet around NSVS 14256825?
NASIROGLU I., GOZDZIEWSKI K., SLOWIKOWSKA A., KRZESZOWSKI K., ZEJMO M., ZOLA S., ER H., OGLOZA W., DROZDZ M., KOZIEL-WIERZBOWSKA D., DEBSKI B. and KARAMAN N.
Abstract (from CDS):
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 2,456,400 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.
© 2017. The American Astronomical Society. All rights reserved.
binaries: close - binaries: eclipsing - planets and satellites: detection - stars: individual: NSVS 14256825 - subdwarfs - subdwarfs
VizieR on-line data:
<Available at CDS (J/AJ/153/137): table1.dat table3.dat table4.dat>
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