WASP-14 b: transit timing analysis of 19 light curves


RAETZ S., MACIEJEWSKI G., SEELIGER M., MARKA C., FERNANDEZ M., Guever T., ...More

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, vol.451, no.4, pp.4139-4149, 2015 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 451 Issue: 4
  • Publication Date: 2015
  • Doi Number: 10.1093/mnras/stv1219
  • Journal Name: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.4139-4149
  • Keywords: planets and satellites: individual: WASP-14 b, stars: individual: GSC 01482-00882, planetary systems, ECLIPSING BINARIES, EXTRASOLAR PLANETS, OPEN CLUSTERS, CCD CAMERA, EVOLUTION
  • Istanbul University Affiliated: Yes

Abstract

Although WASP-14 b is one of the most massive and densest exoplanets on a tight and eccentric orbit, it has never been a target of photometric follow-up monitoring or dedicated observing campaigns. We report on new photometric transit observations of WASP-14 b obtained within the framework of Transit Timing Variations @ Young Exoplanet Transit Initiative (TTV@YETI). We collected 19 light curves of 13 individual transit events using six telescopes located in five observatories distributed in Europe and Asia. From light-curve modelling, we determined the planetary, stellar, and geometrical properties of the system and found them in agreement with the values from the discovery paper. A test of the robustness of the transit times revealed that in case of a non-reproducible transit shape the uncertainties may be underestimated even with a wavelet-based error estimation methods. For the timing analysis, we included two publicly available transit times from 2007 and 2009. The long observation period of seven years (2007-2013) allowed us to refine the transit ephemeris. We derived an orbital period 1.2 s longer and 10 times more precise than the one given in the discovery paper. We found no significant periodic signal in the timing-residuals and, hence, no evidence for TTV in the system.