J/A+A/573/A124 Kepler-117 (KOI-209) transit-timing variations (Bruno+, 2015)
SOPHIE velocimetry of Kepler transit candidates.
XIV. A joint photometric, spectroscopic, and dynamical analysis of the
Kepler-117 system.
Bruno G., Almenara J.-M., Barros S.C.C., Santerne A., Diaz R.F., Deleuil M.,
Damiani C., Bonomo A.S., Boisse I., Bouchy F., Hebrard G., Montagnier G.
<Astron. Astrophys. 573, A124 (2015)>
=2015A&A...573A.124B 2015A&A...573A.124B
ADC_Keywords: Stars, double and multiple ; Planets ; Radial velocities
Keywords: stars: planetary systems - stars: individual: Kepler-117 -
techniques: photometric - techniques: radial velocities -
techniques: spectroscopic - methods: statistical
Abstract:
As part of our follow-up campaign of Kepler planets, we observed
Kepler-117 with the SOPHIE spectrograph at the Observatoire de
Haute-Provence. This F8-type star hosts two transiting planets in
non-resonant orbits. The planets, Kepler-117 b and c, have orbital
periods ~=18.8 and ~=50.8-days, and show transit-timing variations
(TTVs) of several minutes. We performed a combined Markov chain Monte
Carlo (MCMC) fit on transits, radial velocities, and stellar
parameters to constrain the characteristics of the system. We included
the fit of the TTVs in theMCMCby modeling them with dynamical
simulations. In this way, consistent posterior distributions were
drawn for the system parameters. According to our analysis, planets b
and c have notably different masses (0.094±0.033 and
1.84±0.18MJ) and low orbital eccentricities (0.0493±0.0062 and
0.0323±0.0033). The uncertainties on the derived parameters are
strongly reduced if the fit of the TTVs is included in the combined
MCMC. The TTVs allow measuring the mass of planet b, although its
radial velocity amplitude is poorly constrained. Finally, we checked
that the best solution is dynamically stable.
Description:
Kepler-117 was observed by the Kepler space telescope from quarter 1
to 17 between May 2009 and May 2013.
Objects:
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RA (2000) DE Designation(s)
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19 15 10.33 +48 02 24.8 Kepler-117 = KIC 10723750 = KOI-209
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tablea1.dat 23 65 Transit-timing variations for planet b
KOI-209_TTVb.pdf 512 206 Transit-timing variations for planet b with O-C
tablea2.dat 23 26 Transit-timing variations for planet c
KOI-209_TTVc.pdf 512 199 Transit-timing variations for planet c with O-C
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See also:
J/ApJS/197/2 : Transit timing observations from Kepler. I. (Ford+, 2011)
J/ApJ/756/185 : Kepler TTVs. V. Metrics catalog (Ford+, 2012)
J/ApJ/756/186 : TTVs from Kepler. VI. Statistical tests (Steffen+, 2012)
J/ApJS/208/16 : Kepler transit timing observations. VIII. (Mazeh+, 2013)
J/A+A/528/A63 : Velocitometry transit of KOI-428b (Santerne+, 2011)
J/A+A/544/L12 : Velocitometry transit of KOI-13 (Santerne+, 2012)
Byte-by-byte Description of file: tablea1.dat tablea2.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- Epoch [0/76] Epoch sequential number
4- 13 F10.5 d BJD Mid-transit time (BJD-2450000)
15- 19 F5.1 min TTV Transit-timing variation
21- 23 F3.1 min e_TTV rms uncertainty on TTV
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Acknowledgements:
Giovanni Bruno, giovanni.bruno(at)lam.fr
References:
Ehrenreich et al., Paper I 2011A&A...525A..85E 2011A&A...525A..85E
Santerne et al., Paper II 2011A&A...528A..63S 2011A&A...528A..63S, Cat. J/A+A/528/A63
Bouchy et al., Paper III 2011A&A...533A..83B 2011A&A...533A..83B
Santerne et al., Paper IV 2011A&A...536A..70S 2011A&A...536A..70S
Bonomo et al., Paper V 2012A&A...538A..96B 2012A&A...538A..96B
Santerne et al., Paper VI 2012A&A...544L..12S 2012A&A...544L..12S, Cat. J/A+A/544/L12
Santerne et al., Paper VII 2012A&A...545A..76S 2012A&A...545A..76S
Diaz et al., Paper VIII 2013A&A...551L...9D 2013A&A...551L...9D
Moutou et al., Paper IX 2013A&A...558L...6M 2013A&A...558L...6M
BARROS et al., Paper X 2014A&A...561L...1B 2014A&A...561L...1B
Deleuil et al., Paper XI 2014A&A...564A..56D 2014A&A...564A..56D
Santerne et al., Paper XII 2015, in prep
Diaz et al., Paper XIII 2015, in prep
(End) Giovanni Bruno [Marseille, France], Patricia Vannier [CDS] 14-Nov-2014