XO-2b:: Transiting hot Jupiter in a metal-rich common proper motion binary

被引：111

作者：

Burke, Christopher J. ^{[1
]}

McCullough, P. R. ^{[1
]}

Valenti, Jeff A. ^{[1
]}

Johns-Krull, Christopher M. ^{[2
]}

Janes, Kenneth A. ^{[3
]}

Heasley, J. N. ^{[4
]}

Summers, F. J. ^{[1
]}

Stys, J. E. ^{[1
]}

Bissinger, R. ^{[5
]}

Fleenor, Michael L. ^{[6
]}

Foote, Cindy N. ^{[7
]}

Garcia-Melendo, Enrique ^{[8
]}

Gary, Bruce L. ^{[9
]}

Howell, P. J.

Mallia, F. ^{[10
]}

Masi, G. ^{[11
]}

Taylor, B. ^{[3
]}

Vanmunster, T. ^{[12
]}

机构：

[1] Space Telescope Sci Inst, Baltimore, MD 21218 USA

[2] Rice Univ, Dept Astron, Houston, TX 77005 USA

[3] Boston Univ, Dept Astron, Boston, MA 02215 USA

[4] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA

[5] Racoon Run Observ, Pleasanton, CA USA

[6] Volunteer Observ, Knoxville, TN USA

[7] Vermill Cliffs Observ, Kanab, UT USA

[8] Esteve Duran Observ Fdn, Seva 08553, Spain

[9] Hereford Arizona Observ, Hereford, AZ USA

[10] Campo Catino Astronom Observ, Guarcino, Italy

[11] Bellatrix Astronom Observ, Virtual Telescope Project, Ceccano, Italy

[12] CBA Belgium Observ, Landen, Belgium

来源：

ASTROPHYSICAL JOURNAL | 2007年 / 671卷 / 02期

关键词：

binaries : eclipsing; planetary systems; stars : individual (GSC 34130-0005); techniques : photometric; techniques : radial velocities;

D O I：

10.1086/523087

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on a V = 11.2 early K dwarf, XO-2 (GSC 03413- 00005), that hosts a R-p 0.98 +/- (0.03)(0.01) R-J, M-p = 0.57 +/- 0.06 M-J transiting extrasolar planet, XO-2b, with an orbital period of 2.615857 +/- 0.000005 days. XO-2 has high metallicity, [Fe/H] = 0.45 +/- 0.02, high proper motion, mu(tot) = 157 mas yr(-1), and a common proper motion stellar companion with 3100 separation. The two stars are nearly identical twins, with very similar spectra and apparent magnitudes. Due to the high metallicity, these early K dwarf stars have a mass and radius close to solar, M-* = 0.98 +/- 0.02M(circle dot) and R-* = 0.97 +/- (0.02)(0.01) R-circle dot. The high proper motion of XO-2 results from an eccentric orbit (Galactic pericenter, R-per < 4 kpc) well confined to the Galactic disk (Z(max) similar to 100 pc). In addition, the phase-space position of XO-2 is near the Hercules dynamical stream, which points to an origin of XO-2 in the metal-rich, inner thin disk and subsequent dynamical scattering into the solar neighborhood. We describe an efficient Markov chain Monte Carlo algorithm for calculating the Bayesian posterior probability of the system parameters from a transit light curve.

引用

页码：2115 / 2128

页数：14

共 78 条

[1]

ALLEN C, 1991, REV MEX ASTRON ASTR, V22, P255

[2]

[Anonymous], KURUCZ CD ROM 18

[3]

[Anonymous], 1981, Galactic astronomy: Structure and kinematics

[4] HAT-P-1b:: A large-radius, low-density exoplanet transiting one member of a stellar binary [J].

Bakos, G. A. . ;

Noyes, R. W. ;

Kovacs, G. ;

Latham, D. W. ;

Sasselov, D. D. ;

Torres, G. ;

Fischer, D. A. ;

Stefanik, R. P. ;

Sato, B. ;

Johnson, J. A. ;

Pal, A. ;

Marcy, G. W. ;

Butler, R. P. ;

Esquerdo, G. A. ;

Stanek, K. Z. ;

Lazar, J. ;

Papp, I. ;

Sari, P. ;

Sipocz, B. .

ASTROPHYSICAL JOURNAL, 2007, 656 (01) :552-559

[5] Tracing the galactic thick disk to solar metallicities [J].

Bensby, T. ;

Zenn, A. R. ;

Oey, M. S. ;

Feltzing, S. .

ASTROPHYSICAL JOURNAL, 2007, 663 (01) :L13-L16

[6] Elemental abundance trends in the Galactic thin and thick disks as traced by nearby F and G dwarf stars [J].

Bensby, T ;

Feltzing, S ;

Lundström, I .

ASTRONOMY & ASTROPHYSICS, 2003, 410 (02) :527-551

[7] α-, r-, and s-process element trends in the Galactic thin and thick disks [J].

Bensby, T ;

Feltzing, S ;

Lundström, I ;

Ilyin, I .

ASTRONOMY & ASTROPHYSICS, 2005, 433 (01) :185-203

[8]

BENZ W, 2006, IAU C 200, P1

[9] The Hipparcos and Tycho photometric system passbands [J].

Bessell, MS .

PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC, 2000, 112 (773) :961-965

[10] On the radii of extrasolar giant planets [J].

Bodenheimer, P ;

Laughlin, G ;

Lin, DNC .

ASTROPHYSICAL JOURNAL, 2003, 592 (01) :555-563

← 1 2 3 4 5 6 7 8 →