K2-140b and K2-180b-Characterization of a hot Jupiter and a mini-Neptune from the K2 mission

被引:20
作者
Korth, J. [1 ]
Csizmadia, Sz. [2 ]
Gandolfi, D. [3 ]
Fridlund, M. [4 ,5 ]
Paetzold, M. [1 ]
Hirano, T. [6 ]
Livingston, J. [7 ]
Persson, C. M. [4 ]
Deeg, H. J. [8 ,9 ]
Justesen, A. B. [10 ]
Barragan, O. [3 ]
Grziwa, S. [1 ]
Endl, M. [11 ,12 ]
Tronsgaard, R. [13 ,14 ]
Dai, F. [15 ,16 ,17 ]
Cochran, W. D. [11 ,12 ]
Albrecht, S. [10 ]
Alonso, R. [8 ,9 ]
Cabrera, J. [2 ]
Cauley, P. W. [18 ,19 ]
Cusano, F. [20 ]
Eigmueller, Ph. [2 ,21 ]
Erikson, A. [2 ]
Esposito, M. [22 ]
Guenther, E. W. [22 ]
Hatzes, A. P. [22 ]
Hidalgo, D. [8 ,9 ]
Kuzuhara, M. [23 ,24 ]
Montanes, P. [8 ,9 ]
Napolitano, N. R. [25 ]
Narita, N. [7 ,9 ,23 ,24 ]
Niraula, P. [18 ,19 ]
Nespral, D. [8 ,9 ]
Nowak, G. [8 ,9 ]
Palle, E. [8 ,9 ]
Petrillo, C. E. [26 ]
Redfield, S. [18 ,19 ]
Prieto-Arranz, J. [8 ,9 ]
Rauer, H. [2 ,21 ,27 ]
Smith, A. M. S. [2 ]
Tortora, C. [26 ]
Van Eylen, V. [5 ]
Winn, J. N. [17 ]
机构
[1] Univ Cologne, Rhein Inst Umweltforsch, Abt Planetenforsch, Aachener Str 209, D-50931 Cologne, Germany
[2] German Aerosp Ctr, Inst Planetary Res, Rutherfordstr 2, D-12489 Berlin, Germany
[3] Univ Torino, Dipartimento Fis, Via P Giuria 1, I-10125 Turin, Italy
[4] Chalmers Univ Technol, Dept Space Earth & Environm, Onsala Space Observ, SE-43992 Onsala, Sweden
[5] Leiden Univ, Leiden Observ, POB 9513, NL-2300 RA Leiden, Netherlands
[6] Tokyo Inst Technol, Dept Earth & Planetary Sci, Meguro Ku, 2-12-1 Ookayama, Tokyo 1528551, Japan
[7] Univ Tokyo, Dept Astron, Grad Sch Sci, Bunkyo Ku, Hongo 7-3-1, Tokyo 1130033, Japan
[8] Univ La Laguna, Dept Astrofis, E-38206 Tenerife, Spain
[9] Inst Astrofis Canarias, E-38205 Tenerife, Spain
[10] Aarhus Univ, Stellar Astrophys Ctr, Deparment Phys & Astron, Ny Munkegrade 120, DK-8000 Aarhus C, Denmark
[11] Univ Texas Austin, Dept Astron, 2515 Speedway,Stop C1400, Austin, TX 78712 USA
[12] Univ Texas Austin, McDonald Observ, 2515 Speedway,Stop C1400, Austin, TX 78712 USA
[13] Nord Opt Telescope, Rambla Jose Ana Fernandez Perez 7, E-38711 Brena Baja, Spain
[14] Tech Univ Denmark, DTU Space, Natl Space Inst, Elektrovej 328, DK-2800 Lyngby, Denmark
[15] MIT, Dept Phys, Cambridge, MA 02139 USA
[16] MIT, Kavli Inst Astrophys & Space Res, 77 Massachusetts Ave, Cambridge, MA 02139 USA
[17] Princeton Univ, Dept Astrophys Sci, 4 Ivy Lane, Princeton, NJ 08544 USA
[18] Wesleyan Univ, Dept Astron, Middletown, CT 06459 USA
[19] Wesleyan Univ, Van Vleck Observ, Middletown, CT 06459 USA
[20] INAF Osservatorio Astrofis & Sci Spazio Bologna, Via Gobetti 93-3, I-40129 Bologna, Italy
[21] TU Berlin, Ctr Astron & Astrophys, Hardenbergstr 36, D-10623 Berlin, Germany
[22] Thuringer Landessternwarte Tautenburg, Sternwarte 5, D-07778 Tautenburg, Germany
[23] NINS, Astrobiol Ctr, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan
[24] NINS, Natl Astron Observ Japan, 2-21-1 Osawa, Mitaka, Tokyo 1818588, Japan
[25] INAF Osservatorio Astron Capodimonte, Salita Moiariello 16, I-80131 Naples, Italy
[26] Univ Groningen, Kapteyn Astron Inst, Postbus 800, NL-9700 AV Groningen, Netherlands
[27] Free Univ Berlin, Inst Geol Wissensch, Malteserstr 74-100, D-12249 Berlin, Germany
基金
日本学术振兴会; 美国国家航空航天局; 匈牙利科学研究基金会; 美国国家科学基金会; 新加坡国家研究基金会;
关键词
techniques: photometric; techniques: radial velocities; stars: individual: K2-140; stars: individual: K2-180; planets and satellites: fundamental parameters; stars: fundamental parameters; COOL DWARF STARS; TRANSITING EXTRASOLAR PLANETS; EARTH-SIZED PLANET; VALIDATED PLANETS; RADIAL-VELOCITY; BALMER LINES; SUPER-EARTHS; MASS; MODELS; EVOLUTION;
D O I
10.1093/mnras/sty2760
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We report the independent discovery and characterization of two K2 planets: K2-180b, a mini-Neptune-sized planet in an 8.9-d orbit transiting a V= 12.6 mag, metal-poor ([Fe/H] = -0.65 +/- 0.10) K2V star in K2 campaign 5; K2-140b, a transiting hot Jupiter in a 6.6-d orbit around a V= 12.6 mag G6V ([Fe/H] = +0.10 +/- 0.10) star in K2 campaign 10. Our results are based on K2 time-series photometry combined with high-spatial resolution imaging and high-precision radial velocity measurements. We present the first mass measurement of K2-180b. K2-180b has a mass of M-p = 11.3 +/- 1.9 M-circle plus and a radius of R-p = 2.2 +/- 0.1R circle plus, yielding a mean density of rho(p) = 5.6 +/- 1.9 g cm(-3), suggesting a rocky composition. Given its radius, K2-180b is above the region of the so-called 'planetary radius gap'. K2-180b is in addition not only one of the densest mini-Neptune-sized planets, but also one of the few mini-Neptune-sized planets known to transit a metal-poor star. We also constrain the planetary and orbital parameters of K2-140b and show that, given the currently available Doppler measurements, the eccentricity is consistent with zero, contrary to the results of a previous study.
引用
收藏
页码:1807 / 1823
页数:17
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