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

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2019年 / 482卷 / 02期

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

页码：1807 / 1823

页数：17

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