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Exoplanetas | Métodos de Detecção - Trânsito Planetário
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Transcription
Host star
KELT-21b orbits KELT-21 A (HD 332124). It orbits the primary star in a triple star system, with the other two stars located 1.2 arcseconds away. These two stars, designated KELT-21 B and C, have masses of 0.13 M☉ and 0.11 M☉, respectively.[1] The primary star is heavy at 1.458±0.029M☉, extremely hot at 8210±771 K and rapidly rotating (equatorial velocity equal to 141 km/s).[2] The planetary orbit is well aligned with the equatorial plane of the host star, with misalignment equal to −5.6+1.7 −1.9°[3]
Transmission planetary spectroscopy was performed in 2021, based on a single transit observation in 2019. High planetary gravity and relatively low planetary temperature made detection of an atmosphere impossible that time.[4]
^Garai, Z.; Pribulla, T.; Kovács, J.; Szabó, Gy M.; Claret, A.; Komžík, R.; Kundra, E. (2022), "Rapidly rotating stars and their transiting planets: KELT-17b, KELT-19Ab, and KELT-21b in the CHEOPS and TESS era", Monthly Notices of the Royal Astronomical Society, 513 (2): 2822–2840, arXiv:2204.09077, doi:10.1093/mnras/stac1095
^Rice, Malena; Wang, Songhu; Wang, Xian-Yu; Stefánsson, Guđmundur; Isaacson, Howard; Howard, Andrew W.; Logsdon, Sarah E.; Schweiker, Heidi; Dai, Fei; Brinkman, Casey; Giacalone, Steven; Holcomb, Rae (2022), "A Tendency Toward Alignment in Single-star Warm-Jupiter Systems", The Astronomical Journal, 164 (3): 104, arXiv:2207.06511, Bibcode:2022AJ....164..104R, doi:10.3847/1538-3881/ac8153, S2CID250526491
^Stangret, M.; Casasayas-Barris, N.; Pallé, E.; Orell-Miquel, J.; Morello, G.; Luque, R.; Nowak, G.; Yan, F. (2022), "High-resolution transmission spectroscopy study of ultra-hot Jupiters HAT-P-57b, KELT-17b, KELT-21b, KELT-7b, MASCARA-1b, and WASP-189b", Astronomy & Astrophysics, 662: A101, arXiv:2111.13064, Bibcode:2022A&A...662A.101S, doi:10.1051/0004-6361/202141799, S2CID244709777
This page was last edited on 13 January 2024, at 20:06