J/A+A/577/A109 Transit times of Qatar-1b (Maciejewski+, 2015)
No variations in transit times for Qatar-1 b.
Maciejewski G., Fernandez M., Aceituno F.J., Ohlert J., Puchalski D.,
Dimitrov D., Seeliger M., Kitze M., Raetz St., Errmann R., Gilbert H.,
Pannicke A., Schmidt J.-G., Neuhaeuser R.
<Astron. Astrophys. 577, A109 (2015)>
=2015A&A...577A.109M 2015A&A...577A.109M
ADC_Keywords: Stars, double and multiple ; Planets ; Photometry, CCD
Keywords: stars: individual: Qatar-1 -
planets and satellites: individual: Qatar-1 b
Abstract:
The transiting hot Jupiter planet Qatar-1 b was presented to exhibit
variations in transit times that could be of perturbative nature. A
hot Jupiter with a planetary companion on a nearby orbit would
constitute an unprecedented planetary configuration, important for
theories of formation and evolution of planetary systems. We performed
a photometric follow-up campaign to confirm or refute transit timing
variations. 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. We show
that the dataset of transit times is consistent with a linear
ephemeris leaving no hint for any periodic variations with a range of
1 min. We find no compelling evidence for the existence 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
multi-planetary systems. Based on dynamical simulations, we place
tighter constraints on a mass of any fictitious nearby planet in the
system. Furthermore, new transit light curves allowed us to
redetermine system parameters with the precision better than that
reported in previous studies. Our values generally agree with previous
determinations.
Description:
Light curves for eighteen Qatar-1 b's transits observed in 2011-2014
are given. Data were collected with 0.6-2.0-m telescopes located in
six observatories in Europe. Details on observations, data reduction,
and analysis are given in the source paper.
Objects:
-------------------------------------------------------
RA (2000) DE Designation(s)
-------------------------------------------------------
20 13 31.62 +65 09 43.5 Qatar 1 = GSC 04240-00470
-------------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
q1data.dat 43 3781 Light curves for transits of Qatar-1 b
--------------------------------------------------------------------------------
See also:
J/A+A/554/A28 : Qatar-1 differential light curve (Covino+, 2013)
J/A+A/555/A92 : Transit timing variations on Qatar-1 (von Essen+, 2013)
Byte-by-byte Description of file: q1data.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 A14 --- TelCode Telescope code (2)
15- 25 F11.6 d BJD Barycentric Julian date (TDB) (BJD-2450000) (1)
26- 34 F9.6 --- Flux [0.97/1.009] Normalized flux
35- 43 F9.6 --- e_Flux [0.0007/0.0052] Flux error
--------------------------------------------------------------------------------
Note (1): Given as 2450000+ in Barycentric Dynamical Time.
Note (2): Telescopes are:
Rozhen2.0m: National Astronomical Observatory Rozhen, Bulgaria (1 transit)
OSN1.5m: Sierra Nevada Observatory, Spain (4 transits)
Trebur1.2m: Michael Adrian Observatory, Trebur, Germany (3 transits)
Jena0.9m: University Observatory Jena, German (3 transits)
Torun0.6m: Nicolaus Copernicus University, Poland (6 transits)
VolkKirch0.6m: Volkssternwarte Kirchheim, Germany (1 transit)
--------------------------------------------------------------------------------
Acknowledgements:
Gracjan Maciejewski, gmac(at)umk.pl
(End) G. Maciejewski [N. Copernicus Univ., Poland], P. Vannier [CDS] 31-Mar-2015