KELT-11b
KELT-11b is an exoplanet orbiting around the yellow subgiant star KELT-11 about 320 light-years away from Earth. It is an inflated planet, one of the "puffiest planets" known, as a result of its close orbiting distance with its parent star. It has a radius 1.37 times that of Jupiter, but only 19% of its mass. It was discovered in 2016.[1]
| Discovery | |
|---|---|
| Discovery date | July 6, 2016 |
| transit | |
| Orbital characteristics | |
| 0.06229 AU (9,318,000 km) | |
| 4.736529[1] d | |
| Star | KELT-11 |
| Physical characteristics | |
Mean radius | 1.37+0.15 −0.12[1] RJ |
| Mass | 0.195+0.019 −0.018[1] MJ |
Mean density | 0.093+0.028 −0.024 kg m−3 |
| 2.407+0.080 −0.086 m/s² | |
| Temperature | 1712+51 −46[1] |
The transmission spectrum study in 2020 have revealed the KELT-11b atmosphere containing surprisingly small amount of water vapor, but significant amounts of hydrogen cyanide, together with oxides of titaniumm and aluminum. Also, the nightside flux do indicate a generally cloud-free atmosphere with an effective heat redistribution between dayside and nightside.[2]
References
- Pepper, Joshua; Rodriguez, Joseph E.; Collins, Karen A.; Johnson, John Asher; Fulton, Benjamin J.; Howard, Andrew W.; Beatty, Thomas G.; Stassun, Keivan G.; Isaacson, Howard; Colón, Knicole D.; Lund, Michael B.; Kuhn, Rudolf B.; Siverd, Robert J.; Gaudi, B. Scott; Tan, T. G.; Curtis, Ivan; Stockdale, Christopher; Mawet, Dimitri; Bottom, Michael; James, David; Zhou, George; Bayliss, Daniel; Cargile, Phillip; Bieryla, Allyson; Penev, Kaloyan; Latham, David W.; Labadie-Bartz, Jonathan; Kielkopf, John; Eastman, Jason D.; et al. (2017). "KELT-11b: A Highly Inflated Sub-Saturn Exoplanet Transiting theV= 8 Subgiant HD 93396". The Astronomical Journal. 153 (5): 215. arXiv:1607.01755v1. Bibcode:2017AJ....153..215P. doi:10.3847/1538-3881/aa6572.
- Colón, Knicole D.; Kreidberg, Laura; Line, Michael; Welbanks, Luis; Madhusudhan, Nikku; Beatty, Thomas; Tamburo, Patrick; Stevenson, Kevin B.; Mandell, Avi; Rodriguez, Joseph E.; Barclay, Thomas; Lopez, Eric D.; Stassun, Keivan G.; Angerhausen, Daniel; Fortney, Jonathan J.; James, David J.; Pepper, Joshua; Ahlers, John P.; Plavchan, Peter; Awiphan, Supachai; Kotnik, Cliff; McLeod, Kim K.; Murawski, Gabriel; Chotani, Heena; LeBrun, Danny; Matzko, William; Rea, David; Vidaurri, Monica; Webster, Scott; et al. (2020). "An Unusual Transmission Spectrum for the Sub-Saturn KELT-11b Suggestive of a Sub-Solar Water Abundance". arXiv:2005.05153 [astro-ph.EP].
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