HAT-P-44b, HAT-P-45b, AND HAT-P-46b: THREE TRANSITING HOT JUPITERS IN POSSIBLE MULTI-PLANET SYSTEMS

被引：29

作者：

Hartman, J. D. ^{[1
]}

Bakos, G. A. ^{[1
]}

Torres, G. ^{[2
]}

Kovacs, G. ^{[3
,4
]}

Johnson, J. A. ^{[5
]}

Howard, A. W. ^{[6
]}

Marcy, G. W. ^{[7
]}

Latham, D. W. ^{[2
]}

Bieryla, A. ^{[2
]}

Buchhave, L. A. ^{[8
]}

Bhatti, W. ^{[1
]}

Beky, B. ^{[2
]}

Csubry, Z. ^{[1
]}

Penev, K. ^{[1
]}

De Val-Borro, M. ^{[1
]}

Noyes, R. W. ^{[2
]}

Fischer, D. A. ^{[9
]}

Esquerdo, G. A. ^{[2
]}

Everett, M. ^{[10
]}

Szklenar, T. ^{[11
]}

Zhou, G. ^{[12
]}

Bayliss, D. ^{[12
]}

Shporer, A. ^{[5
,13
,14
]}

Fulton, B. J. ^{[6
]}

Sanchis-Ojeda, R. ^{[15
]}

Falco, E. ^{[2
]}

Lazar, J. ^{[11
]}

Papp, I. ^{[11
]}

Sari, P. ^{[11
]}

机构：

[1] Princeton Univ, Dept Astrophys Sci, Princeton, NJ 08544 USA

[2] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[3] Konkoly Observ Budapest, Budapest, Hungary

[4] Univ N Dakota, Dept Phys & Astrophys, Grand Forks, ND 58202 USA

[5] CALTECH, Dept Astrophys, Pasadena, CA 91125 USA

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

[7] Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA

[8] Univ Copenhagen, Niels Bohr Inst, DK-2100 Copenhagen, Denmark

[9] Yale Univ, Dept Astron, New Haven, CT 06520 USA

[10] Natl Opt Astron Observ, Tucson, AZ 85719 USA

[11] Hungarian Astron Assoc, H-1461 Budapest, Hungary

[12] Australian Natl Univ, Res Sch Astron & Astrophys, Canberra, ACT 2611, Australia

[13] Las Cumbres Observ Global Telescope Network, Santa Barbara, CA 93117 USA

[14] Univ Calif Santa Barbara, Dept Phys, Santa Barbara, CA 93106 USA

[15] MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA

来源：

ASTRONOMICAL JOURNAL | 2014年 / 147卷 / 06期

基金：

美国国家科学基金会;

关键词：

planetary systems; stars:; individual; (HAT-P-44; HAT-P-45; HAT-P-46); techniques: photometric; techniques: spectroscopic; ECCENTRIC ORBIT; GIANT PLANETS; BRIGHT STAR; LONG-PERIOD; MULTIPLANET SYSTEMS; KEPLER FIELD; HOST STARS; K-DWARF; SEARCH; STELLAR;

D O I：

10.1088/0004-6256/147/6/128

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery by the HATNet survey of three new transiting extrasolar planets orbiting moderately bright (V = 13.2, 12.8, and 11.9) stars. The planets have orbital periods of 4.3012, 3.1290, and 4.4631 days, masses of 0.35, 0.89, and 0.49 M-J, and radii of 1.24, 1.43, and 1.28 R-J. The stellar hosts have masses of 0.94, 1.26, and 1.28 M-circle dot . Each system shows significant systematic variations in its residual radial velocities, indicating the possible presence of additional components. Based on its Bayesian evidence, the preferred model for HAT-P-44 consists of two planets, including the transiting component, with the outer planet having a period of 872 days, eccentricity of 0.494 +/- 0.081, and a minimum mass of 4.0 M-J. Due to aliasing we cannot rule out alternative solutions for the outer planet having a period of 220 days or 438 days. For HAT-P-45, at present there is not enough data to justify the additional free parameters included in a multi-planet model; in this case a single-planet solution is preferred, but the required jitter of 22.5 +/- 6.3 m s(-1) is relatively high for a star of this type. For HAT-P-46 the preferred solution includes a second planet having a period of 78 days and a minimum mass of 2.0 M-J, however the preference for this model over a single-planet model is not very strong. While substantial uncertainties remain as to the presence and/or properties of the outer planetary companions in these systems, the inner transiting planets are well characterized with measured properties that are fairly robust against changes in the assumed models for the outer planets. Continued radial velocity monitoring is necessary to fully characterize these three planetary systems, the properties of which may have important implications for understanding the formation of hot Jupiters.

引用

页数：18

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