A NEARBY M STAR WITH THREE TRANSITING SUPER-EARTHS DISCOVERED BY K2

被引：131

作者：

Crossfield, Ian J. M. ^{[1
,12
]}

Petigura, Erik ^{[2
]}

Schlieder, Joshua E. ^{[3
]}

Howard, Andrew W. ^{[4
]}

Fulton, B. J. ^{[4
]}

Aller, Kimberly M. ^{[4
]}

Ciardi, David R. ^{[5
]}

Lepine, Sebastien ^{[6
]}

Barclay, Thomas ^{[3
]}

De Pater, Imke ^{[2
]}

De Kleer, Katherine ^{[2
]}

Quintana, Elisa V. ^{[3
]}

Christiansen, Jessie L. ^{[5
]}

Schlafly, Eddie ^{[7
]}

Kaltenegger, Lisa ^{[11
]}

Crepp, Justin R. ^{[8
]}

Henning, Thomas ^{[7
]}

Obermeier, Christian ^{[7
]}

Deacon, Niall ^{[9
]}

Weiss, Lauren M. ^{[2
]}

Isaacson, Howard T. ^{[2
]}

Hansen, Brad M. S. ^{[10
]}

Liu, Michael C. ^{[4
]}

Greene, Tom ^{[3
]}

Howell, Steve B. ^{[3
]}

Barman, Travis ^{[1
]}

Mordasini, Christoph ^{[7
,12
]}

机构：

[1] Univ Arizona Lunar, Lunar & Planetary Lab, Tucson, AZ 85721 USA

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

[3] NASA, Ames Res Ctr, Moffett Field, CA 94035 USA

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

[5] CALTECH, NASA Exoplanet Sci Inst, Pasadena, CA 91125 USA

[6] Georgia State Univ, Dept Phys & Astron, Atlanta, GA 30303 USA

[7] Max Planck Inst Astron, D-69117 Heidelberg, Germany

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

[9] Univ Hertfordshire, Coll Lane, Hatfield AL10 9AB, Herts, England

[10] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA USA

[11] Cornell Univ, Dept Astron, Ithaca, NY 14853 USA

[12] Inst Phys, CH-3012 Bern, Switzerland

来源：

ASTROPHYSICAL JOURNAL | 2015年 / 804卷 / 01期

基金：

美国国家科学基金会;

关键词：

eclipses; stars: individual (EPIC 201367065); techniques: photometric; techniques: spectroscopic; DIGITAL SKY SURVEY; M-DWARFS; LOW-MASS; PLANET CANDIDATES; FALSE POSITIVES; BLEND SCENARIOS; NORTHERN STARS; PROPER MOTION; LIGHT CURVES; DATA RELEASE;

D O I：

10.1088/0004-637X/804/1/10

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Small, cool planets represent the typical end-products of planetary formation. Studying the architectures of these systems, measuring planet masses and radii, and observing these planets' atmospheres during transit directly informs theories of planet assembly, migration, and evolution. Here we report the discovery of three small planets orbiting a bright (K-s = 8.6 mag) M0 dwarf using data collected as part of K2, the new ecliptic survey using the repurposed Kepler spacecraft. Stellar spectroscopy and K2 photometry indicate that the system hosts three transiting planets with radii 1.5-2.1 R-circle plus, straddling the transition region between rocky and increasingly volatile-dominated compositions. With orbital periods of 10-45 days the planets receive just 1.5-10x the flux incident on Earth, making these some of the coolest small planets known orbiting a nearby star; planet d is located near the inner edge of the system's habitable zone. The bright, low-mass star makes this system an excellent laboratory to determine the planets' masses via Doppler spectroscopy and to constrain their atmospheric compositions via transit spectroscopy. This discovery demonstrates the ability of K2 and future space-based transit searches to find many fascinating objects of interest.

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