KELT-4Ab: AN INFLATED HOT JUPITER TRANSITING THE BRIGHT (V ∼ 10) COMPONENT OF A HIERARCHICAL TRIPLE

被引：30

作者：

Eastman, Jason D. ^{[1
]}

Beatty, Thomas G. ^{[2
,3
]}

Siverd, Robert J. ^{[4
]}

Antognino, Joseph M. O. ^{[5
]}

Penny, Matthew T. ^{[5
]}

Gonzales, Erica J. ^{[6
]}

Crepp, Justin R. ^{[6
]}

Howard, Andrew W. ^{[7
]}

Avril, Ryan L. ^{[8
]}

Bieryla, Allyson ^{[1
]}

Collins, Karen ^{[9
]}

Fulton, Benjamin J. ^{[7
]}

Ge, Jian ^{[10
]}

Gregorio, Joao ^{[11
]}

Ma, Bo ^{[10
]}

Mellon, Samuel N. ^{[8
,12
]}

Oberst, Thomas E. ^{[8
]}

Wang, Ji ^{[13
]}

Gaudi, B. Scott ^{[5
]}

Pepper, Joshua ^{[14
]}

Stassun, Keivan G. ^{[9
]}

Buchhave, Lars A. ^{[1
]}

Jensen, Eric L. N. ^{[15
]}

Latham, David W. ^{[1
]}

Berlind, Perry ^{[1
]}

Calkins, Michael L. ^{[1
]}

Cargile, Phillip A. ^{[1
]}

Colon, Knicole D. ^{[14
,16
,17
]}

Dhital, Saurav ^{[18
]}

Esquerd, Gilbert A. ^{[1
]}

Johnson, John Asher ^{[1
]}

Kielkopf, John F. ^{[19
]}

Manner, Mark ^{[20
]}

Mao, Qingqing ^{[9
]}

McLeod, Kim K. ^{[21
]}

Penev, Kaloyan ^{[22
]}

Stefanik, Robert P. ^{[1
]}

Street, Rachel ^{[4
]}

Zambelli, Roberto ^{[23
]}

DePoy, D. L. ^{[24
,25
]}

Gould, Andrew ^{[5
]}

Marshall, Jennifer L. ^{[24
,25
]}

Pogge, Richard W. ^{[5
]}

Trueblood, Mark ^{[26
]}

Trueblood, Patricia ^{[26
]}

机构：

[1] Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA

[2] Penn State Univ, Dept Astron & Astrophys, Davey Lab 525, University Pk, PA 16802 USA

[3] Penn State Univ, Ctr Exoplanets & Habitable Worlds, Davey Lab 525, University Pk, PA 16802 USA

[4] Las Cumbres Observ, Global Telescope Network, Goleta, CA 93117 USA

[5] Ohio State Univ, Dept Astron, 174 W 18Th Ave, Columbus, OH 43210 USA

[6] Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA

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

[8] Westminster Coll, Dept Phys, New Wilmington, PA 16172 USA

[9] Vanderbilt Univ, Dept Phys & Astron, Nashville, TN 37235 USA

[10] Univ Florida, Dept Astron, Bryant Space Sci Ctr 211, Gainesville, FL 32611 USA

[11] Atalaia Grp & Crow Observ, Portalegre, Portugal

[12] Univ Rochester, Dept Phys & Astron, Rochester, NY 14627 USA

[13] CALTECH, Dept Astrophys, MC 249-17, Pasadena, CA 91125 USA

[14] Lehigh Univ, Dept Phys, Bldg 16, Bethlehem, PA 18015 USA

[15] Swarthmore Coll, Dept Phys & Astron, Swarthmore, PA 19081 USA

[16] NASA, Ames Res Ctr, M-S 244-30, Moffett Field, CA 94035 USA

[17] Bay Area Environm Res Inst, 625 2nd St Ste 209, Petaluma, CA 94952 USA

[18] Boston Univ, Dept Astron, 725 Commonwealth Ave, Boston, MA 02215 USA

[19] Univ Louisville, Dept Phys & Astron, Louisville, KY 40292 USA

[20] Spot Observ, Nunnelly, TN 37137 USA

[21] Wellesley Coll, Wellesley, MA 02481 USA

[22] Princeton Univ, Dept Astrophys Sci, Peyton Hall, Princeton, NJ 08544 USA

[23] Soc Astronom Lunae, Via Montefrancio 77, I-19030 Castelnuovo Magra, Italy

[24] Texas A&M Univ, George P & Cynthia Woods Mitchell Inst Fundamenta, College Stn, TX 77843 USA

[25] Texas A&M Univ, Dept Phys & Astron, College Stn, TX 77843 USA

[26] Winer Observ, Sonoita, AZ 85637 USA

来源：

ASTRONOMICAL JOURNAL | 2016年 / 151卷 / 02期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

binaries: visual; eclipses; planets and satellites: detection; planets and satellites: dynamical evolution and stability; planets and satellites: gaseous planets; techniques: photometric; STELLAR EVOLUTION; QUADRUPLE SYSTEMS; MASS COMPANION; Y-2; ISOCHRONES; PLANET; STAR; EXOPLANETS; ATMOSPHERE; TELESCOPE; BINARY;

D O I：

10.3847/0004-6256/151/2/45

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of KELT-4Ab, an inflated, transiting Hot Jupiter orbiting the brightest component of a hierarchical triple stellar system. The host star is an F star with T-eff = 6206 +/- 75 K, log g = 4.108 +/- 0.014, [Fe/H] = -0.116(-0.069)(+0.065), M-* = 1.201(-0.061)(+0.067) M-circle dot, and R-* = 1.603(-0.038)(+0.039) R-circle dot. The best-fit linear ephemeris is BJD(TDB) = 2456193.29157 +/- 0.00021 + E(2.9895936 +/- 0.0000048). With a magnitude of V similar to 10, a planetary radius of 1.699(-0.045)(+0.046) R-J, and a mass of 0.902(-0.059)(+0.060) M-J, it is the brightest host among the population of inflated Hot Jupiters (R-P > 1.5R(J)), making it a valuable discovery for probing the nature of inflated planets. In addition, its existence within a hierarchical triple and its proximity to Earth ( 210 pc) provide a unique opportunity for dynamical studies with continued monitoring with high resolution imaging and precision radial velocities. The projected separation between KELT-4A and KELT-4BC is 328 +/- 16 AU and the projected separation between KELT-4B and KELT-4C is 10.30 +/- 0.74 AU. Assuming face-on, circular orbits, their respective periods would be 3780 +/- 290 and 29.4 +/- 3.6 years and the astrometric motions relative to the epoch in this work of both the binary stars around each other and of the binary around the primary star would be detectable now and may provide meaningful constraints on the dynamics of the system.

引用

页数：14

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