KELT-11b: A Highly Inflated Sub-Saturn Exoplanet Transiting the V=8 Subgiant HD 93396

被引：40

作者：

Pepper, Joshua ^{[1
]}

Rodriguez, Joseph E. ^{[2
]}

Collins, Karen A. ^{[2
,3
]}

Johnson, John Asher ^{[4
]}

Fulton, Benjamin J. ^{[5
]}

Howard, Andrew W. ^{[5
]}

Beatty, Thomas G. ^{[6
,7
]}

Stassun, Keivan G. ^{[2
,3
]}

Isaacson, Howard ^{[8
]}

Colon, Knicole D. ^{[1
,9
,10
,11
]}

Lund, Michael B. ^{[2
]}

Kuhn, Rudolf B. ^{[12
]}

Siverd, Robert J. ^{[13
]}

Gaudi, B. Scott ^{[14
]}

Tan, T. G. ^{[15
]}

Curtis, Ivan ^{[16
]}

Stockdale, Christopher ^{[17
,18
]}

Mawet, Dimitri ^{[19
,20
]}

Bottom, Michael ^{[19
,20
]}

James, David ^{[21
]}

Zhou, George

Bayliss, Daniel ^{[22
]}

Cargile, Phillip ^{[4
]}

Bieryla, Allyson ^{[4
]}

Penev, Kaloyan ^{[23
]}

Latham, David W. ^{[4
]}

Labadie-Bartz, Jonathan ^{[1
]}

Kielkopf, John ^{[24
]}

Eastman, Jason D. ^{[4
]}

Oberst, Thomas E. ^{[25
]}

Jensen, Eric L. N. ^{[26
]}

Nelson, Peter ^{[27
]}

Sliski, David H. ^{[28
]}

Wittenmyer, Robert A. ^{[29
,30
,31
]}

McCrady, Nate ^{[32
]}

Wright, Jason T.

Relles, Howard M. ^{[4
]}

Stevens, Daniel J. ^{[14
]}

Joner, Michael D. ^{[33
]}

Hintz, Eric ^{[33
]}

机构：

[1] Lehigh Univ, Dept Phys, 16 Mem Dr, Bethlehem, PA 18015 USA

[2] Vanderbilt Univ, Stevenson Ctr 6301, Dept Phys & Astron, Nashville, TN 37235 USA

[3] Fisk Univ, Dept Phys, 1000 17th Ave North, Nashville, TN 37208 USA

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

[5] Univ Hawaii, Inst Astron, 2680 Woodlawn Dr, Honolulu, HI 96822 USA

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

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

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

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

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

[11] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[12] South African Astron Observ, Cape Town, South Africa

[13] Las Cumbres Observ Global Telescope Network, 6740 Cortona Dr,Suite 102, Santa Barbara, CA 93117 USA

[14] Ohio State Univ, Dept Astron, Columbus, OH 43210 USA

[15] Perth Exoplanet Survey Telescope, Perth, WA, Australia

[16] ICO, Adelaide, SA, Australia

[17] Amer Assoc Variable Star Observers, 49 Bay State Rd, Cambridge, MA 02138 USA

[18] Hazelwood Observ, Hazelwood, Australia

[19] CALTECH, Dept Astron, 1200 E Calif Blvd,MC 249-17, Pasadena, CA 91125 USA

[20] CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA

[21] Univ Washington, Dept Astron, Box 351580, Seattle, WA 98195 USA

[22] Observ Astrono Univ Geneve, 51 Ch Maillettes, CH-1290 Versoix, Switzerland

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

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

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

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

[27] Ellinbank Observ, Victoria, Australia

[28] Univ Penn, Dept Phys & Astron, Philadelphia, PA 19104 USA

[29] Univ New South Wales, Sch Phys, Sydney, NSW 2052, Australia

[30] Univ New South Wales, Australian Ctr Astrobiol, Sydney, NSW 2052, Australia

[31] Univ Southern Queensland, Computat Engn & Sci Res Ctr, Toowoomba, Qld 4350, Australia

[32] Univ Montana, Dept Phys & Astron, Missoula, MT 59812 USA

[33] Brigham Young Univ, Dept Phys & Astron, Provo, UT 84602 USA

来源：

ASTRONOMICAL JOURNAL | 2017年 / 153卷 / 05期

基金：

瑞士国家科学基金会; 美国国家科学基金会; 澳大利亚研究理事会; 美国国家航空航天局;

关键词：

planetary systems; planets and satellites: detection; stars: individual (KELT-11); techniques: photometric; techniques: radial velocities; HOT-JUPITER; EXTRASOLAR PLANET; SHORT-PERIOD; F-DWARF; STELLAR; STARS; KEPLER; PARAMETERS; EVOLUTION; SEARCH;

D O I：

10.3847/1538-3881/aa6572

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of a transiting exoplanet, KELT-11b, orbiting the bright (V = 8.0) subgiant HD 93396. A global analysis of the system shows that the host star is an evolved subgiant star with T-eff= 5370 +/- 51 K, M* 1.438(-0.052)(+0.061)M(circle dot) R*= 2.72(-0.17) (+0.21) M-circle dot R*=log g* 3.727(-0.046)(+0.040) , and [Fe/H]= 0.180 +/- 0.075. The planet is a low-mass gas giant in a P = 4.736529 +/- 0.00006 day orbit, with M-P =0.195 +/- 0.018 M-J, R-P = 1.37(-0.12)(+0.15) R-J, rho(P) = 0.09(-0.024)(+0.028) g cm(-3), surface gravity log g(P) = 2.407(-0.086)(+0.080) , and equilibrium temperature T-eq = 1712(-46)(+51) K. KELT-11 is the brightest known transiting exoplanet host in the southern hemisphere by more than a magnitude. and is the sixth brightest transit host to date. The planet is one of the most inflated planets known, with an exceptionally large atmospheric scale height (2763 km), and an associated size of the expected atmospheric transmission signal of 5.6%. These attributes make the KELT-11 system a valuable target for follow-up and atmospheric characterization, and it promises to become one of the benchmark systems for the study of inflated exoplanets.

引用

页数：15

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