Parameters of recent transits of HAT–P–23b
F. G. Ramón–Fox1 and P. V. Sada2
1 Instituto Tecnológico y de Estudios Superiores de Monterrey, 64849, Monterrey, Nuevo León, México. (fg.ramon.fox@googlemail.com).
2 Universidad de Monterrey, 66238, San Pedro Garza García, Nuevo León, México. (pedro.valdes@udem.edu.mx).
Received 2012 March 8. ]]> Accepted 2012 November 26.
RESUMEN
Cuatro tránsitos del planeta extrasolar HAT–P–23b fueron observados recientemente con el telescopio de 0.36 m del Observatorio de la Universidad de Monterrey. Las cuatro curvas de luz fueron exitosamente combinadas para obtener una resultante de mayor calidad. Esta curva lúe modelada utilizando un método de Monte Cario para obtener los parámetros esenciales que caracterizan al sistema. Asumiendo parámetros orbitales como la excentricidad e y la longitud del periastro ω reportados en el artículo del descubrimiento, encontramos valores de Rp/R* = 0.1105 +0.0015 –0.0013 para la razón del radio del planeta al radio estelar, a/R* = 4.23 +0.06 –0.12 para el semieje mayor normalizado, y una inclinación orbital de i = 87.9° +1.5–2.2. Obtenemos un período orbital de 1.2128868 ± 0.0000004 días (To = 2,454, 852.26542 ± 0.00018 BJD_TDB).
ABSTRACT
Four transits of the exoplanet HAT–P–23b were recently observed with the 0.36 m telescope at the Universidad de Monterrey Observatory. The four light curves were successfully combined to obtain a resulting one with reduced scattering per bin. This curve was modeled using a Monte Carlo method to obtain the essential parameters that characterize the system. Assuming orbital parameters such as eccentricity e and longitude of periastron ω from the discovery paper, we found values of Rp/R* = 0.1105 +0.0015 –0.0013 the planet–to–star radius ratio, a/R* = 4.23 +0.06 –0.12 the scaled semimajor axis, and an orbital inclination of the system of i = 87.9° +1.5–2.2. We also derive an improved orbital period of 1.2128868 ±0.0000004 days (To = 2,454, 852.26542 ± 0.00018 BJD_TDB) for the system.
Key Words: planets and satellites: detection — stars: individual (GSC 1632–01396).
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