Bibcode
Tingley, B.; Parviainen, H.; Gandolfi, D.; Deeg, H. J.; Palle, E.; Montañés Rodriguez, P.; Murgas, F.; Alonso, R.; Bruntt, H.; Fridlund, M.
Referencia bibliográfica
Astronomy and Astrophysics, Volume 567, id.A14, 8 pp.
Advertised on:
7
2014
Revista
Número de citas
15
Número de citas referidas
12
Descripción
Aims: We announce confirmation of Kepler-418b, one of two
proposed planets in this system. This is the first confirmation of an
exoplanet based primarily on the transit color signature technique. Methods: We used the Kepler public data archive combined with
multicolor photometry from the Gran Telescopio de Canarias and radial
velocity follow-up using FIES at the Nordic Optical Telescope for
confirmation. Results: We report a confident detection of a
transit color signature that can only be explained by a compact
occulting body, entirely ruling out a contaminating eclipsing binary, a
hierarchical triple, or a grazing eclipsing binary. Those findings are
corroborated by our radial velocity measurements, which put an upper
limit of ~1 MJup on the mass of Kepler-418b. We also report
that the host star is significantly blended, confirming the ~10% light
contamination suspected from the crowding metric in the Kepler light
curve measured by the Kepler team. We report detection of an unresolved
light source that contributes an additional ~30% to the target star,
which would not have been detected without multicolor photometric
analysis. The resulting planet-star radius ratio is 0.110 ±
0.0025, more than 25% more than the 0.087 measured by Kepler leading to
a radius of 1.20 ± 0.16 RJup instead of the 0.94
RJup measured by the Kepler team. Conclusions: This is
the first confirmation of an exoplanet candidate based primarily on the
transit color signature, demonstrating that this technique is viable
from ground for giant planets. It is particularly useful for planets
with long periods such as Kepler-418b, which tend to have long transit
durations. While this technique is limited to candidates with deep
transits from the ground, it may be possible to confirm earth-like
exoplanet candidates with a few hours of observing time with an
instrument like the James Webb Space Telescope. Additionally, multicolor
photometric analysis of transits can reveal unknown stellar neighbors
and binary companions that do not affect the classification of the
transiting object but can have a very significant effect on the
perceived planetary radius.
GTC g' and z' photometry and NOT-FIES spectroscopy are only available at
the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr
(ftp://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/567/A14
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