KELT-18b
| Discovery[1] | |
|---|---|
| Discovery site | Winer Observatoryin Sonoita, Arizona (KELTNorth) |
| Discovery date | February 6, 2017 |
| Transit | |
| Orbital characteristics | |
| 0.0455 ± 0.00069 AU (6,807,000 ± 103,000 km)[1] | |
| Eccentricity | 0[1] |
| 2.87±0.00d[2] | |
| Inclination | 82.90°+0.62° −0.54°[2] |
| 2,457,542.53±0.00JD[2] | |
| Semi-amplitude | 127±11m/s[1] |
| Star | KELT-18 |
| Physical characteristics | |
| 1.57±0.04RJ[1] | |
| Mass | 1.18±0.11MJ[1] |
Meandensity | 0.380 ± 0.040 g/cm3[1] |
| Temperature | 2,085+39 −38K[1] |
KELT-18bis ahot Jupiterorbiting the F-type main sequence star KELT-18 approximately 1,058 light years away in the northerncircumpolar constellationUrsa Major.[3]The planet was discovered using the transit method, and was announced in June 2017.
Discovery
[edit]KELT-18b was discovered in 2017 by scientists using the KELTNorth telescope at theWiner Observatory.The paper states that this planet is the most "inflated" of its type due to its low mass, density, and high radius.
Properties
[edit]KELT-18b has 1.18 timesJupiter's mass,and is 57% larger thanJupiter.Despite the high mass, its density is lower thanSaturn's, and has a highequilibrium temperatureof 2,085Kdue to orbiting close to a hot star. The planet orbits at a distance 10 times closer thanMercury's in almost 3 days.
References
[edit]- ^abcdefghMcLeod, Kim K.; Rodriguez, Joseph E.; Oelkers, Ryan J.; Collins, Karen A.; Bieryla, Allyson; Fulton, Benjamin J.; Stassun, Keivan G.; Gaudi, B. Scott; Penev, Kaloyan; Stevens, Daniel J.; et al. (1 June 2017)."KELT-18b: Puffy Planet, Hot Host, Probably Perturbed".The Astronomical Journal.153(6): 263.arXiv:1702.01657.Bibcode:2017AJ....153..263M.doi:10.3847/1538-3881/aa6d5d.ISSN0004-6256.S2CID54667386.
- ^abcMaciejewski, G. (1 September 2020)."Search for Planets in Hot Jupiter Systems with Multi-Sector TESS Photometry. I. No Companions in Planetary Systems KELT-18, KELT-23, KELT-24, Qatar-8, WASP-62, WASP-100, WASP-119, and WASP-126".Acta Astronomica.70(3): 181–202.arXiv:2010.11977.Bibcode:2020AcA....70..181M.doi:10.32023/0001-5237/70.3.2.ISSN0001-5237.S2CID225061977.
- ^Brown, A. G. A.;et al. (Gaia collaboration) (August 2018)."GaiaData Release 2: Summary of the contents and survey properties ".Astronomy & Astrophysics.616.A1.arXiv:1804.09365.Bibcode:2018A&A...616A...1G.doi:10.1051/0004-6361/201833051.Gaia DR2 record for this sourceatVizieR.
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