NDLI: No variations in transit times for Qatar-1 b

Content Provider	EDP Sciences
Author	G. Maciejewski M. Fernández F. J. Aceituno J. Ohlert D. Puchalski D. Dimitrov M. Seeliger M. Kitze St. Raetz R. Errmann H. Gilbert A. Pannicke J.-G. Schmidt R. Neuhäuser
Abstract	Aims. The transiting hot-Jupiter planet Qatar-1 b exhibits variations in transit times that could be perturbative. A hot Jupiter with a planetary companion on a nearby orbit would constitute an unprecedented planetary configuration, which is important for theories of the formation and evolution of planetary systems. We performed a photometric follow-up campaign to confirm or refute transit timing variations.Methods. We extend the baseline of transit observations by acquiring 18 new transit light curves acquired with 0.6−2.0 m telescopes. These photometric time series, together with data available in the literature, were analyzed in a homogenous way to derive reliable transit parameters and their uncertainties. Results. We show that the dataset of transit times is consistent with a linear ephemeris leaving no hint of any periodic variations with a range of 1 min. We find no compelling evidence of a close-in planetary companion to Qatar-1 b. This finding is in line with a paradigm that hot Jupiters are not components of compact multiplanetary systems. Based on dynamical simulations, we place tighter constraints on the mass of any fictitious nearby planet in the system. Furthermore, new transit light curves allowed us to redetermine system parameters with better precision than reported in previous studies. Our values generally agree with previous determinations.
Page Count	7
File Format	HTM / HTML PDF
ISSN	00046361
Alternate Webpage(s)	https://www.aanda.org/articles/aa/abs/2015/05/aa26031-15/aa26031-15.html
e-ISSN	14320746
Journal	Astronomy & Astrophysics
Volume Number	577
DOI	10.1051/0004-6361/201526031
Language	English
Publisher	EDP Sciences
Publisher Date	2015-05-01
Access Restriction	Open
Rights Holder	© ESO, 2015
Subject Keyword	planets and satellites: individual: Qatar 1b stars: individual: Qatar 1 planets and satellites: individual: Qatar 1b / stars: individual: Qatar 1
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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