Kepler-18b, c, and d: a system of three planets confirmed by transit timing variations, light curve validation, Warm-Spitzer photometry, and radial velocity measurements
Article
Article Title | Kepler-18b, c, and d: a system of three planets confirmed by transit timing variations, light curve validation, Warm-Spitzer photometry, and radial velocity measurements |
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ERA Journal ID | 1058 |
Article Category | Article |
Authors | Cochran, William D. (Author), Fabrycky, Daniel C. (Author), Torres, Guillermo (Author), Fressin, Francois (Author), Desert, Jean Michel (Author), Ragozzine, Darin (Author), Sasselov, Dimitar (Author), Fortney, Jonathan J. (Author), Rowe, Jason F. (Author), Brugamyer, Erik J. (Author), Bryson, Stephen T. (Author), Carter, Joshua A. (Author), Ciardi, David R. (Author), Howell, Steve B. (Author), Steffen, Jason H. (Author), Borucki, William J. (Author), Koch, David G. (Author), Winn, Joshua N. (Author), Welsh, William F. (Author), Uddin, Kamal (Author), Tenenbaum, Peter (Author), Still, M. (Author), Seager, Sara (Author), Quinn, Samuel N. (Author), Mullally, F. (Author), Miller, Neil (Author), Marcy, Geoffrey W. (Author), MacQueen, Phillip J. (Author), Lucas, Phillip (Author), Lissauer, Jack J. (Author), Latham, David W. (Author), Knutson, Heather (Author), Kinemuchi, K. (Author), Johnson, John A. (Author), Jenkins, Jon M. (Author), Isaacson, Howard (Author), Howard, Andrew (Author), Horch, Elliott (Author), Holman, Matthew J. (Author), Henze, Christopher E. (Author), Haas, Michael R. (Author), Gilliland, Ronald L. (Author), Gautier, Thomas N. (Author), Ford, Eric B. (Author), Fischer, Debra A. (Author), Everett, Mark (Author), Endl, Michael (Author), Demory, Brice Oliver (Author), Deming, Drake (Author), Charbonneau, David (Author), Caldwell, Douglas (Author), Buchhave, Lars (Author), Brown, Timothy M. (Author) and Batalha, Natalie (Author) |
Journal Title | Astrophysical Journal Supplement Series |
Journal Citation | 197 (1), pp. 7-25 |
Article Number | 7 |
Number of Pages | 19 |
Year | 2011 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0067-0049 |
1538-4365 | |
Digital Object Identifier (DOI) | https://doi.org/10.1088/0067-0049/197/1/7 |
Web Address (URL) | http://iopscience.iop.org/article/10.1088/0067-0049/197/1/7 |
Abstract | We report the detection of three transiting planets around a Sun-like star, which we designate Kepler-18. The transit signals were detected in photometric data from the Kepler satellite, and were confirmed to arise from planets using a combination of large transit-timing variations (TTVs), radial velocity variations, Warm-Spitzer observations, and statistical analysis of false-positive probabilities. The Kepler-18 star has a mass of 0.97 M ⊙, a radius of 1.1 R ⊙, an effective temperature of 5345K, and an iron abundance of [Fe/H] = +0.19. The planets have orbital periods of approximately 3.5, 7.6, and 14.9 days. The innermost planet 'b' is a 'super-Earth' with a mass of 6.9 ± 3.4 M ⊕, a radius of 2.00 ± 0.10 R ⊕, an' a mean density of 4.9 ± 2.4gcm3. The two outer planets 'c' and 'd' are both low-density Neptune-mass planets. Kepler-18c has a mass of 17.3 ± 1.9 M ⊕, a radius of 5.49 ± 0.26 R ⊕, and a mean density of 0.59 0.07gcm 3, while Kepler-18d has a mass of 16.4 ± 1.4 M ⊕, a radius of 6.98 ± 0.33 R ⊕ and a mean density of 0.27 ± 0.03gcm3. Kepler-18c and Kepler-18d have orbital periods near a 2:1 mean-motion resonance, leading to large and readily detected TTVs. |
Keywords | planetary systems; stars; Kepler-18; KIC 8644288; 2MASS J19521906+4444467; photometry; spectroscopy |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
519999. Other physical sciences not elsewhere classified | |
Public Notes | For access to this article, please click on the URL link provided. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | University of Texas at Austin, United States |
University of California, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
NASA Ames Research Center, United States | |
National Aeronautics and Space Administration (NASA), United States | |
Fermilab Cosmic Physics Centre, United States | |
Massachusetts Institute of Technology, United States | |
San Diego State University, United States | |
University of Hertfordshire, United Kingdom | |
California Institute of Technology (Caltech), United States | |
Southern Connecticut State University, United States | |
Space Telescope Science Institute, United States | |
University of Florida, United States | |
Massey University, New Zealand | |
National Optical Astronomy Observatory, United States | |
NASA Goddard Space Flight Center, United States | |
University of Copenhagen, Denmark | |
Las Cumbres Observatory, United States | |
San Jose University, United States |
https://research.usq.edu.au/item/q4334/kepler-18b-c-and-d-a-system-of-three-planets-confirmed-by-transit-timing-variations-light-curve-validation-warm-spitzer-photometry-and-radial-velocity-measurements
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