Stellar diameters and temperatures - VI. High angular resolution measurements of the transiting exoplanet host stars HD 189733 and HD 209458 and implications for models of cool dwarfs

被引：92

作者：

Boyajian, Tabetha ^{[1
]}

von Braun, Kaspar ^{[2
,3
,4
]}

Feiden, Gregory A. ^{[5
]}

Huber, Daniel ^{[6
,7
]}

Basu, Sarbani ^{[1
]}

Demarque, Pierre ^{[1
]}

Fischer, Debra A. ^{[1
]}

Schaefer, Gail ^{[8
]}

Mann, Andrew W. ^{[9
]}

White, Timothy R. ^{[10
]}

Maestro, Vicente ^{[11
]}

Brewer, John ^{[1
]}

Lamell, C. Brooke ^{[1
]}

Spada, Federico ^{[12
]}

Lopez-Morales, Mercedes ^{[13
]}

Ireland, Michael ^{[14
]}

Farrington, Chris ^{[8
]}

van Belle, Gerard T. ^{[4
]}

Kane, Stephen R. ^{[15
]}

Jones, Jeremy ^{[16
,17
]}

ten Brummelaar, Theo A. ^{[8
]}

Ciardi, David R. ^{[18
]}

McAlister, Harold A. ^{[16
,17
]}

Ridgway, Stephen ^{[19
]}

Goldfinger, P. J. ^{[8
]}

Turner, Nils H. ^{[8
]}

Sturmann, Laszlo ^{[8
]}

机构：

[1] Yale Univ, New Haven, CT 06520 USA

[2] Max Planck Inst Astron, D-69117 Heidelberg, Germany

[3] Mirasol Inst, D-81679 Munich, Germany

[4] Lowell Observ, Flagstaff, AZ 86001 USA

[5] Uppsala Univ, Dept Phys & Astron, SE-75120 Uppsala, Sweden

[6] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA

[7] SETI Inst, Mountain View, CA 94043 USA

[8] Mt Wilson Observ, CHARA Array, Mount Wilson, CA 91023 USA

[9] Univ Texas Austin, Dept Astron, Austin, TX 78712 USA

[10] Univ Gottingen, Inst Astrophys, D-37077 Gottingen, Germany

[11] Univ Sydney, Sch Phys, Sydney Inst Astron, Sydney, NSW 2006, Australia

[12] Leibniz Inst f ur Astrophys Potsdam AIP, D-14482 Potsdam, Germany

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

[14] Australian Natl Univ, Res Sch Astron & Astrophys, Weston, ACT 2611, Australia

[15] San Francisco State Univ, Dept Phys & Astron, San Francisco, CA 94132 USA

[16] Georgia State Univ, Ctr High Angular Resolut Astron, Atlanta, GA 30303 USA

[17] Georgia State Univ, Dept Phys & Astron, Atlanta, GA 30303 USA

[18] CALTECH, NASA Exoplanet Sci Inst, Pasadena, CA 91125 USA

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

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2015年 / 447卷 / 01期

基金：

美国国家科学基金会;

关键词：

techniques: interferometric; stars: fundamental parameters; stars: individual: HD 189733; stars: individual: HD 209458; stars: late-type; infrared: stars; INFRARED FLUX METHOD; INTEGRAL-FIELD SPECTROGRAPH; BASE-LINE INTERFEROMETRY; VIRTUAL OBSERVATORY TOOL; LOW-MASS STARS; CHARA ARRAY; ASTROPHYSICAL PARAMETERS; FUNDAMENTAL PROPERTIES; EXTRASOLAR PLANETS; MAIN-SEQUENCE;

D O I：

10.1093/mnras/stu2502

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present direct radii measurements of the well-known transiting exoplanet host stars HD 189733 and HD 209458 using the CHARA Array interferometer. We find the limb-darkened angular diameters to be theta(LD) = 0.3848 +/- 0.0055 and 0.2254 +/- 0.0072 mas for HD 189733 and HD 209458, respectively. HD 189733 and HD 209458 are currently the only two transiting exoplanet systems where detection of the respective planetary companion's orbital motion from high-resolution spectroscopy has revealed absolute masses for both star and planet. We use our new measurements together with the orbital information from radial velocity and photometric time series data, Hipparcos distances, and newly measured bolometric fluxes to determine the stellar effective temperatures (T-eff = 4875 +/- 43, 6092 +/- 103 K), stellar linear radii (R-* = 0.805 +/- 0.016, 1.203 +/- 0.061 R-circle dot), mean stellar densities (rho(*) = 1.62 +/- 0.11, 0.58 +/- 0.14 rho(circle dot)), planetary radii (R-p = 1.216 +/- 0.024, 1.451 +/- 0.074 R-Jup), and mean planetary densities (rho(p) = 0.605 +/- 0.029, 0.196 +/- 0.033 rho(Jup)) for HD 189733b and HD 209458b, respectively. The stellar parameters for HD 209458, an F9 dwarf, are consistent with indirect estimates derived from spectroscopic and evolutionary modelling. However, we find that models are unable to reproduce the observational results for the K2 dwarf, HD 189733. We show that, for stellar evolutionary models to match the observed stellar properties of HD 189733, adjustments lowering the solar-calibrated mixing-length parameter to alpha(MLT) = 1.34 need to be employed.

引用

页码：846 / 857

页数：12

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