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arXiv 0907.3525astro-ph.EP
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HAT-P-13 b,c:一颗在偏心轨道上有一颗巨大外伴星的凌日热木星

HAT-P-13b,c: a transiting hot Jupiter with a massive outer companion on an eccentric orbit

G. A. Bakos, A. W. Howard, R. W. Noyes, J. Hartman, G. Torres, Geza Kovacs, D. A. Fischer, D. W. Latham, J. A. Johnson, G. W. Marcy, D. D. Sasselov, R. P. Stefa… 展开作者

G. A. Bakos, A. W. Howard, R. W. Noyes, J. Hartman, G. Torres, Geza Kovacs, D. A. Fischer, D. W. Latham, J. A. Johnson, G. W. Marcy, D. D. Sasselov, R. P. Stefanik, B. Sipocz, Gabor Kovacs, G. A. Esquerdo, A. Pal, J. Lazar, I. Papp

摘要:

我们报告发现一个行星系,它有一个近圆形轨道上的过境热木星和一个高偏心轨道上的大质量外行星。内行星HAT-P-13 b每隔P = 2.916260 \pm 0.000010天就会经过明亮的V=10.622 G4矮星GSC 3416-00543,凌日历元Tc = 2454779.92979 \pm 0.00038(BJD),持续时间0.1345 \pm 0.0017 d。外行星HAT-P-13 c的轨道周期为P2 = 428.5 \pm 3.0天,标称凌日中心(假设零碰撞参量)为T2 c = 2454870.4 \pm 1.8(BJD)或近星点通过时间T2,τ = 2454890.05 \pm 0.48(BJD)。外行星的凌日还没有被观测到,也可能不存在。主星的质量为1.22 \pm ^0.05_0.10 Msun,半径为1.56 \pm 0.08 Rsun,有效温度为5653 \pm 90 K,并且富含金属,[Fe=H] = +0.41 \pm 0.08。内行星伴星的质量为0.853 \pm ^0.029_-0.046 MJup,半径为1.281 \pm 0.079 RJup,平均密度为0.498 \pm +0.103_-0.069 gcm^-3。外伴星的m2 sini 2 = 15.2 \pm 1.0 MJup,轨道高度偏心,轨道高度偏心,e2 = 0.691 \pm 0.018。虽然我们还没有发现HAT-P-13 b的显著过境时间变化,但由于引力和光旅行时间的影响,未来的观测将限制HAT-P-13 c的轨道倾角,以及它与HAT-P-13 b的相互倾角。HAT-P-13(b,c)双行星系统对于行星系的形成和动力学的理论研究可能是非常有价值的。

英文摘要:

We report on the discovery of a planetary system with a close-in transiting hot Jupiter on a near circular orbit and a massive outer planet on a highly eccentric orbit. The inner planet, HAT-P-13b, transits the bright V=10.622 G4 dwarf star GSC 3416-00543 every P = 2.916260 \pm 0.000010 days, with transit epoch Tc = 2454779.92979 \pm 0.00038 (BJD) and duration 0.1345 \pm 0.0017 d. The outer planet, HAT-P-13c orbits the star with P2 = 428.5 \pm 3.0 days and nominal transit center (assuming zero impact parameter) of T2c = 2454870.4 \pm 1.8 (BJD) or time of periastron passage T2,peri= 2454890.05 \pm 0.48 (BJD). Transits of the outer planet have not been observed, and may not be present. The host star has a mass of 1.22 \pm ^0.05_0.10 Msun, radius of 1.56 \pm 0.08 Rsun, effective temperature 5653 \pm 90 K, and is rather metal rich with [Fe=H] = +0.41 \pm 0.08. The inner planetary companion has a mass of 0.853\pm ^0.029_-0.046MJup, and radius of 1.281 \pm 0.079 RJup yielding a mean density of 0.498\pm +0.103_-0.069 gcm^-3. The outer companion has m2 sini2 = 15.2 \pm 1.0 MJup, and orbits on a highly eccentric orbit of e2 = 0.691 \pm 0.018. While we have not detected significant transit timing variations of HAT-P-13b, due to gravitational and light-travel time effects, future observations will constrain the orbital inclination of HAT-P-13c, along with its mutual inclination to HAT-P-13b. The HAT-P-13 (b,c) double-planet system may prove extremely valuable for theoretical studies of the formation and dynamics of planetary systems.

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