XO-2b: TRANSITING HOT JUPITER IN A METAL-RICH COMMON PROPER MOTION BINARY

XO-2b: TRANSITING HOT JUPITER IN A METAL-RICH COMMON PROPER MOTION BINARY

2007 | CHRISTOPHER J. BURKE¹, P. R. MCCULLOUGH¹, JEFF A. VALENTI¹, CHRISTOPHER M. JOHNS-KRULL², KENNETH A. JANES³, J. N. HEASLEY⁴, F. J. SUMMERS⁵, J. E. STYS⁶, R. BISSINGER⁷, MICHAEL L. FLEENOR⁸, CINDY N. FOOTE⁹, ENRIQUE GARCÍA-MELENDO¹⁰, BRUCE L. GARY¹¹, P. J. HOWELL¹², F. MALLIA¹³, G. MAS̹⁴, B. TAYLOR¹⁵, T. VANMUNSTER¹⁶
XO-2b is a transiting hot Jupiter orbiting a metal-rich, high-proper-motion early K-type dwarf star, XO-2. The star has a metallicity of [Fe/H] = 0.45 ± 0.02 and a proper motion of 157 mas yr⁻¹. XO-2 has a stellar companion at a separation of 31", and the two stars are nearly identical in mass, radius, and spectrum. The high metallicity of XO-2 suggests it formed in the metal-rich inner Thin Disk and was dynamically scattered into the solar neighborhood. The planet XO-2b has a mass of 0.57 ± 0.06 MJ and a radius of 0.98 ± 0.03 RJ, with an orbital period of 2.615857 ± 0.000005 days. The planet's high metallicity may contribute to its inflated radius. The system is part of a binary star system with a separation of 31", and the binary's high proper motion suggests it is part of the Hercules dynamical stream. The study uses a Markov Chain Monte Carlo algorithm to analyze the transit light curve and determine the system parameters. The planet's mass was confirmed using radial velocity measurements. The ephemeris for XO-2b was refined, and no significant transit timing variations were detected. The binary system's properties and Galactic orbit were analyzed, and the system is likely part of the Thin Disk. The study provides insights into the formation and evolution of transiting hot Jupiter planets in binary systems.XO-2b is a transiting hot Jupiter orbiting a metal-rich, high-proper-motion early K-type dwarf star, XO-2. The star has a metallicity of [Fe/H] = 0.45 ± 0.02 and a proper motion of 157 mas yr⁻¹. XO-2 has a stellar companion at a separation of 31", and the two stars are nearly identical in mass, radius, and spectrum. The high metallicity of XO-2 suggests it formed in the metal-rich inner Thin Disk and was dynamically scattered into the solar neighborhood. The planet XO-2b has a mass of 0.57 ± 0.06 MJ and a radius of 0.98 ± 0.03 RJ, with an orbital period of 2.615857 ± 0.000005 days. The planet's high metallicity may contribute to its inflated radius. The system is part of a binary star system with a separation of 31", and the binary's high proper motion suggests it is part of the Hercules dynamical stream. The study uses a Markov Chain Monte Carlo algorithm to analyze the transit light curve and determine the system parameters. The planet's mass was confirmed using radial velocity measurements. The ephemeris for XO-2b was refined, and no significant transit timing variations were detected. The binary system's properties and Galactic orbit were analyzed, and the system is likely part of the Thin Disk. The study provides insights into the formation and evolution of transiting hot Jupiter planets in binary systems.
Reach us at info@study.space
Understanding Accepted for Publication in the Astrophysical Journal Osse Observations of 3c 273