Bibcode
Gandolfi, D.; Parviainen, H.; Deeg, H. J.; Lanza, A. F.; Fridlund, M.; Prada Moroni, P. G.; Alonso, R.; Augusteijn, T.; Cabrera, J.; Evans, T.; Geier, S.; Hatzes, A. P.; Holczer, T.; Hoyer, S.; Kangas, T.; Mazeh, T.; Pagano, I.; Tal-Or, L.; Tingley, B.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 576, id.A11, 13 pp.
Advertised on:
4
2015
Revista
Número de citas
43
Número de citas referidas
42
Descripción
We report the spectroscopic confirmation of the Kepler object of
interest KOI-183.01 (Kepler-423b), a half-Jupiter mass planet transiting
an old solar-like star every 2.7 days. Our analysis is the first to
combine the full Kepler photometry (quarters 1-17) with high-precision
radial velocity measurements taken with the FIES spectrograph at the
Nordic Optical Telescope. We simultaneously modelled the photometric and
spectroscopic data-sets using Bayesian approach coupled with Markov
chain Monte Carlo sampling. We found that the Kepler pre-search data
conditioned light curve of Kepler-423 exhibits quarter-to-quarter
systematic variations of the transit depth, with a peak-to-peak
amplitude of ~4.3% and seasonal trends reoccurring every four quarters.
We attributed these systematics to an incorrect assessment of the
quarterly variation of the crowding metric. The host star Kepler-423 is
a G4 dwarf with M⋆ = 0.85 ± 0.04
M⊙, R⋆ = 0.95 ± 0.04
R⊙, Teff= 5560 ± 80 K, [M/H] = - 0.10
± 0.05 dex, and with an age of 11 ± 2 Gyr. The planet
Kepler-423b has a mass of Mp= 0.595 ±
0.081MJup and a radius of Rp= 1.192 ±
0.052RJup, yielding a planetary bulk density of
ρp = 0.459 ± 0.083 g cm-3. The radius
of Kepler-423b is consistent with both theoretical models for irradiated
coreless giant planets and expectations based on empirical laws. The
inclination of the stellar spin axis suggests that the system is aligned
along the line of sight. We detected a tentative secondary eclipse of
the planet at a 2σ confidence level (ΔFec = 14.2
± 6.6 ppm) and found that the orbit might have asmall non-zero
eccentricity of 0.019+0.028-0.014. With a Bond
albedo of AB = 0.037 ± 0.019, Kepler-423b is one of
the gas-giant planets with the lowest albedo known so far.
Based on observations obtained with the Nordic Optical Telescope,
operated on the island of La Palma jointly by Denmark, Finland, Iceland,
Norway, and Sweden, in the Spanish Observatorio del Roque de los
Muchachos of the Instituto de Astrofisica de Canarias, in time allocated
by OPTICON and the Spanish Time Allocation Committee (CAT).The research
leading to these results has received funding from the European
Community's Seventh Framework Programme (FP7/2007-2013) under grant
agreement number RG226604 (OPTICON) and 267251 (AstroFIt).
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