Cochran, William D.; Fabrycky, Daniel C.; Torres, Guillermo; Fressin, François; Désert, Jean-Michel; Ragozzine, Darin; Sasselov, Dimitar; Fortney, Jonathan J.; Rowe, Jason F.; Brugamyer, Erik J.; Bryson, Stephen T.; Carter, Joshua A.; Ciardi, David R.; Howell, Steve B.; Steffen, Jason H.; Borucki, William. J.; Koch, David G.; Winn, Joshua N.; Welsh, William F.; Uddin, Kamal; ... (2011). 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. Astrophysical journal - supplement series, 197(1), p. 7. Institute of Physics Publishing IOP 10.1088/0067-0049/197/1/7
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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 5345 K, 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⊕, and a mean density of 4.9 ± 2.4 g cm3. 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 ± 0.07 g cm3, 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 ± 0.03 g cm3. Kepler-18c and Kepler-18d have orbital periods near a 2:1 mean-motion resonance, leading to large and readily detected TTVs.
Item Type: |
Journal Article (Original Article) |
|---|---|
Division/Institute: |
10 Strategic Research Centers > Center for Space and Habitability (CSH) |
UniBE Contributor: |
Demory, Brice-Olivier Denys |
Subjects: |
500 Science > 520 Astronomy |
ISSN: |
0067-0049 |
Publisher: |
Institute of Physics Publishing IOP |
Language: |
English |
Submitter: |
Brice-Olivier Denys Demory |
Date Deposited: |
06 Apr 2022 12:09 |
Last Modified: |
02 Mar 2023 23:34 |
Publisher DOI: |
10.1088/0067-0049/197/1/7 |
BORIS DOI: |
10.48350/153323 |
URI: |
https://boris.unibe.ch/id/eprint/153323 |
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