HD 129445 b

HD 129445 b
Exoplaneta Estrelas com exoplanetas
Estrela mãe[1]
Estrela HD 152079
Constelação Ara
Ascensão reta 14h 46m 03,1s
Declinação -68° 45′ 45,9″
Magnitude aparente 8,79
Distância 210 ± 20 anos-luz
66 ± 5 pc
Tipo espectral G6V
Elementos orbitais[2]
Semieixo maior 2,9 ± 0,2 UA
Excentricidade 0,70 ± 0,10
Período orbital 1 840 ± 55 dias
5,04 ± 0,15 anos
Argumento do periastro 163 ± 15°
Semi-amplitude 38 ± 6 m/s m/s
Características físicas[2]
Massa >1,6 ± 0,6 MJ
Descoberta[2]
Data da descoberta 2010 (publicação)
Descobridores Arriagada et al.
Método de detecção Espectroscopia Doppler
Estado da descoberta Publicada
Outras designações
HIP 82632 b

HD 129445 b é um planeta extrassolar que orbita a estrela HD 129445, localizada na constelação de Circinus a aproximadamente 210 anos-luz (66 parsecs) da Terra. Foi descoberto em 2010 pelo Magellan Planet Search Program com uso do método da velocidade radial, que consiste em buscar variações na velocidade radial de uma estrela causadas pela presença de um planeta em órbita.[2]

HD 129445 b é um gigante gasoso com massa mínima de 1,6 vezes a massa de Júpiter. Como o método usado em sua descoberta não permite a determinação da inclinação, sua massa verdadeira não pode ser determinada. Sua órbita ao redor de HD 129445 é longa e altamente excêntrica, com semieixo maior de 2,9 UA (2,9 vezes a distância entre a Terra e o Sol), período orbital de 1 840 dias e excentricidade de 0,7.[2] Uma pesquisa em busca de potenciais alvos para trânsito calculou que a probabilidade do planeta possuir inclinação maior que 80° é de 20%.[3]

Referências

  1. ↑ «SIMBAD query result - HD 129445». SIMBAD. Centre de Données astronomiques de Strasbourg. Consultado em 8 de maio de 2015 
  2. ↑ a b c d e Arriagada, Pamela; et al. (março de 2010). «Five Long-period Extrasolar Planets in Eccentric Orbits from the Magellan Planet Search Program». The Astrophysical Journal. 711 (2). pp. 1229–1235. Bibcode:2010ApJ...711.1229A. doi:10.1088/0004-637X/711/2/1229 
  3. ↑ Herrero, E.; Ribas, I.; Jordi, C.; Guinan, E. F.; Engle, S. G. (janeiro de 2012). «Optimizing exoplanet transit searches around low-mass stars with inclination constraints». Astronomy & Astrophysics. 537. pp. A147, 10. Bibcode:2012A&A...537A.147H. doi:10.1051/0004-6361/201117809 

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