Search: onr:"swepub:oai:research.chalmers.se:1177df2b-db56-412b-9276-1b2280388002" >
Kepler-423b: a half...
Kepler-423b: a half-Jupiter mass planet transiting a very old solar-like star
-
- Gandolfi, D. (author)
- Istituto nazionale di astrofisica (INAF)
-
- Parviainen, H. (author)
- University Of Oxford
-
- Deeg, H. J. (author)
- Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
-
show more...
-
- Lanza, A. F. (author)
- Istituto nazionale di astrofisica (INAF)
-
- Fridlund, Malcolm, 1952 (author)
- Chalmers tekniska högskola,Chalmers University of Technology
-
- Moroni, P. G. P. (author)
- Universita di Pisa,University of Pisa
-
- Alonso, R. (author)
- Instituto de Astrofísica de Canarias,Universidad de la Laguna,University of La Laguna
-
Augusteijn, T. (author)
-
- Cabrera, J. (author)
- Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR)
-
- Evans, T. (author)
- University Of Oxford
-
Geier, S. (author)
-
Hatzes, A. (author)
-
- Holczer, T. (author)
- Tel Aviv University
-
- Hoyer, S. (author)
- Universidad de la Laguna,University of La Laguna,Instituto de Astrofísica de Canarias
-
Kangas, T. (author)
-
- Mazeh, T. (author)
- Tel Aviv University
-
- Pagano, I. (author)
- Istituto nazionale di astrofisica (INAF)
-
- Tal-Or, L. (author)
- Tel Aviv University
-
- Tingley, B. (author)
- Århus Universitet,Aarhus University
-
show less...
-
(creator_code:org_t)
- 2015-03-13
- 2015
- English.
-
In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 576
- Related links:
-
http://publications.... (primary) (free)
-
show more...
-
https://www.aanda.or...
-
https://research.cha...
-
https://doi.org/10.1...
-
show less...
Abstract
Subject headings
Close
- 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 similar to 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-circle dot, R-* = 0.95 +/- 0.04 R-circle dot, T-eff = 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 M-p = 0.595 +/- 0.081 M-Jup and a radius of R-p = 1.192 +/- 0.052 R-Jup, yielding a planetary bulk density of rho(p) = 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 2 sigma confidence level (Delta F-ec = 14.2 +/- 6.6 ppm) and found that the orbit might have a small non-zero eccentricity of 0.019(-0.014)(+0.028) . With a Bond albedo of A(B) = 0.037 +/- 0.019, Kepler-423b is one of the gas-giant planets with the lowest albedo known so far.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- techniques: radial velocities
- planets and satellites: detection
- planets and satellites: individual: Kepler-423b
- planets and satellites: fundamental parameters
- techniques: photometric
- stars: fundamental parameters
Publication and Content Type
- art (subject category)
- ref (subject category)
Find in a library
To the university's database
- By the author/editor
-
Gandolfi, D.
-
Parviainen, H.
-
Deeg, H. J.
-
Lanza, A. F.
-
Fridlund, Malcol ...
-
Moroni, P. G. P.
-
show more...
-
Alonso, R.
-
Augusteijn, T.
-
Cabrera, J.
-
Evans, T.
-
Geier, S.
-
Hatzes, A.
-
Holczer, T.
-
Hoyer, S.
-
Kangas, T.
-
Mazeh, T.
-
Pagano, I.
-
Tal-Or, L.
-
Tingley, B.
-
show less...
- About the subject
-
- NATURAL SCIENCES
-
NATURAL SCIENCES
-
and Physical Science ...
-
and Astronomy Astrop ...
- Articles in the publication
-
Astronomy and As ...
- By the university
-
Chalmers University of Technology