Nonsinusoidal transit timing variations for the exoplanet HATP12b
Abstract
Considering the importance of investigating the transit timing variations (TTVs) of transiting exoplanets, we present a followup study of HATP12b. We include six new light curves observed between 2011 and 2015 from three different observatories, in association with 25 light curves taken from the published literature. The sample of the data used thus covers a time span of ∼ 10.2 years with a large coverage of epochs (1160) for the transiting events of the exoplanet HATP12b. The light curves are utilized to determine the orbital parameters and conduct an investigation of possible TTVs. The new linear ephemeris shows a large value of reduced χ^{2}, i.e. ${\chi }_{{\rm{red}}}^{2}(23)$ = 7.93, and the sinusoidal fitting using the prominent frequency coming from a periodogram shows a reduced χ^{2} around 4. Based on these values and the corresponding O  C diagrams, we suspect the presence of a possible nonsinusoidal TTV in this planetary system. Finally, we find that a scenario with an additional nontransiting exoplanet could explain this TTV with an even smaller reduced χ^{2} value of around 2.
 Publication:

Research in Astronomy and Astrophysics
 Pub Date:
 May 2021
 DOI:
 10.1088/16744527/21/4/97
 arXiv:
 arXiv:2012.08820
 Bibcode:
 2021RAA....21...97S
 Keywords:

 planetary systems;
 techniques;
 photometric;
 Astrophysics  Earth and Planetary Astrophysics
 EPrint:
 19 pages, 7 tables, 6 figures, accepted by RAA