K2-287 b: An Eccentric Warm Saturn Transiting a G-dwarf

被引：17

作者：

Jordan, Andres ^{[1
,2
]}

Brahm, Rafael ^{[1
,2
,3
]}

Espinoza, Nestor ^{[4
]}

Cortes, Cristian ^{[5
]}

Diaz, Maths ^{[6
]}

Drass, Holger ^{[2
,3
]}

Henning, Thomas ^{[4
]}

Jenkins, James S. ^{[6
]}

Jones, Matias, I ^{[7
]}

Rabus, Markus ^{[3
,4
]}

Rojas, Felipe ^{[1
]}

Sarkis, Paula ^{[4
]}

Vuckovic, Maja ^{[8
]}

Zapata, Abner ^{[3
]}

Soto, Maritza G. ^{[9
]}

Bakos, Gaspar A. ^{[10
,16
]}

Bayliss, Daniel ^{[11
]}

Bhatti, Waqas ^{[10
]}

Csubry, Zoltan ^{[10
]}

Lachaume, Regis ^{[3
,4
]}

Moraga, Victor ^{[1
]}

Pantoja, Blake ^{[6
]}

Osip, David ^{[12
]}

Shporer, Avi ^{[13
,14
]}

Suc, Vincent ^{[1
]}

Vasquez, Sergio ^{[15
]}

机构：

[1] Pontificia Univ Catolica Chile, Inst Astrofis, Av Vicuna Mackenna 4860, Santiago, Chile

[2] Millennium Inst Astrophys, Santiago, Chile

[3] Pontificia Univ Catolica Chile, Ctr Astroengn UC, Av Vicuna Mackenna 4860, Santiago 7820436, Chile

[4] Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany

[5] Univ Metropolitana Educ, Fac Ciencias Basicas, Dept Fis, Av Jose Pedro Alessandri 774, Santiago 7760197, Chile

[6] Univ Chile, Dept Astron, Camino EL Observ 1515, Santiago, Chile

[7] European Southern Observ, Casilla 19001, Santiago, Chile

[8] Univ Vaparaiso, Inst Fis & Astron, Casilla 5030, Valparaiso, Chile

[9] Queen Mary Univ London, Sch Phys & Astron, 327 Mile End Rd, London, England

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

[11] Univ Warwick, Dept Phys, Coventry CV4 7AL, W Midlands, England

[12] Carnegie Inst Sci, Las Campanas Observ, Casilla 601, La Serena, Chile

[13] MIT, Dept Phys, Cambridge, MA 02139 USA

[14] MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA

[15] Direcc Educ, Museo Interact Mirador, Av Punta Arenas 6711, Santiago, Chile

[16] Konkoly Observ Budapest, Budapest, Hungary

来源：

ASTRONOMICAL JOURNAL | 2019年 / 157卷 / 03期

关键词：

planetary systems; planets and satellites: detection; planets and satellites: gaseous planets; stars: individual (K2-287); GIANT PLANET; EXOPLANETS; JUPITERS; PARAMETERS; SEARCH; STARS; RADII; ORBIT; MASS;

D O I：

10.3847/1538-3881/aafa79

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the discovery of K2-287b, a Saturn mass planet orbiting a G-dwarf with a period of P approximate to 15 days. First uncovered as a candidate using K2 campaign 15 data, follow-up photometry and spectroscopy were used to determine a mass M-p = 0.317 +/- 0.026 M-J, radius R-p = 0.833 +/- 0.013 R-J, period P = 14.893291 +/- 0.000025 days, and eccentricity e = 0.476 +/- 0.026. The host star is a metal-rich V = 11.410 +/- 0.129 mag G-dwarf for which we estimate a mass M-* = 1.056(-0.021)(+0.022) M-circle dot, radius R-* = 1.070 +/- 0.010 R-circle dot, metallicity [Fe/H] = 0.20 +/- 0.05, and T-eff = 5673 +/- 75 K. This warm eccentric planet with a time-averaged equilibrium temperature of T-eq approximate to 800 K adds to the small sample of giant planets orbiting nearby stars whose structure is not expected to be affected by stellar irradiation. Follow-up studies on the K2-287 system could help constrain theories of planet migration in close-in orbits.

引用

页数：9

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