197 CANDIDATES AND 104 VALIDATED PLANETS IN K2's FIRST FIVE FIELDS

被引：156

作者：

Crossfield, Ian J. M. ^{[1
,29
]}

Ciardi, David R. ^{[2
]}

Petigura, Erik A. ^{[3
]}

Sinukoff, Evan ^{[4
]}

Schlieder, Joshua E. ^{[2
,5
]}

Howard, Andrew W. ^{[4
]}

Beichman, Charles A. ^{[2
]}

Isaacson, Howard ^{[6
]}

Dressing, Courtney D. ^{[3
]}

Christiansen, Jessie L. ^{[2
]}

Fulton, Benjamin J. ^{[4
]}

Lepine, Sebastien ^{[7
]}

Weiss, Lauren ^{[6
]}

Hirsch, Lea ^{[6
]}

Livingston, John ^{[8
]}

Baranec, Christoph ^{[9
]}

Law, Nicholas M. ^{[10
]}

Riddle, Reed ^{[11
]}

Ziegler, Carl ^{[10
]}

Howell, Steve B.

Horch, Elliott ^{[12
]}

Everett, Mark ^{[13
]}

Teske, Johanna ^{[14
]}

Martinez, Arturo O. ^{[7
,15
]}

Obermeier, Christian ^{[16
]}

Benneke, Bjorn ^{[3
]}

Scott, Nic ^{[17
]}

Deacon, Niall ^{[18
]}

Aller, Kimberly M. ^{[4
]}

Hansen, Brad M. S. ^{[19
,20
]}

Mancini, Luigi ^{[16
]}

Ciceri, Simona ^{[16
,21
]}

Brahm, Rafael ^{[22
]}

Jordan, Andres ^{[22
,23
]}

Knutson, Heather A. ^{[3
]}

Henning, Thomas ^{[16
]}

Bonnefoy, Michael ^{[24
,25
]}

Liu, Michael C. ^{[4
]}

Crepp, Justin R. ^{[26
]}

Lothringer, Joshua ^{[1
]}

Hinz, Phil

Bailey, Vanessa ^{[27
]}

Skemer, Andrew ^{[27
,28
,29
]}

Defrere, Denis ^{[24
,25
,30
]}

机构：

[1] Univ Arizona, Lunar & Planetary Lab, 1629 E Univ Blvd, Tucson, AZ 85721 USA

[2] NASA, CALTECH, Exoplanet Sci Inst, Pasadena, CA USA

[3] CALTECH, Geol & Planetary Sci, Pasadena, CA 91125 USA

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

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

[6] Univ Calif Berkeley, Dept Astron, 601 Campbell Hall, Berkeley, CA 94720 USA

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

[8] Univ Tokyo, Dept Astron, Bunkyo Ku, 7-3-1, Tokyo 1130033, Japan

[9] Univ Hawaii Manoa, Inst Astron, Hilo, HI USA

[10] Univ North Carolina Chapel Hill, Dept Phys & Astron, Chapel Hill, NC USA

[11] CALTECH, Div Phys Math & Astron, Pasadena, CA 91125 USA

[12] Southern Connecticut State Univ, Dept Phys, New Haven, CT USA

[13] Natl Opt Astron Observ, Tucson, AZ 85726 USA

[14] Carnegie Dept Terr Magnetism, Washington, DC USA

[15] San Diego State Univ, Dept Astron, San Diego, CA 92182 USA

[16] Max Planck Inst Astron, Heidelberg, Germany

[17] Univ Sydney, Sydney Inst Astron, Redfern, Australia

[18] Univ Hertfordshire, Ctr Astrophys Res, Hatfield, Herts, England

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

[20] Univ Calif Los Angeles, Inst Geophys & Planetary Sci, Los Angeles, CA 90024 USA

[21] Stockholm Univ, Dept Astron, SE-10691 Stockholm, Sweden

[22] Millennium Inst Astrophys, Av Vicuna Mackenna 4860, Santiago 7820436, Chile

[23] Pontificia Univ Catolica Chile, Fac Fis, Inst Astrofis, Av Vicuna Mackenna 4860, Santiago 7820436, Chile

[24] Univ Grenoble Alpes, IPAG, F-38000 Grenoble, France

[25] CNRS, IPAG, F-38000 Grenoble, France

[26] Univ Notre Dame, Dept Phys, 225 Nieuwland Sci Hall, Notre Dame, IN 46556 USA

[27] Univ Arizona, Steward Observ, Tucson, AZ USA

[28] Stanford Univ, Kavli Inst Particle Astrophys & Cosmol, Stanford, CA 94305 USA

[29] Univ Calif Santa Cruz, Dept Astron, Santa Cruz, CA 95064 USA

[30] Univ Liege, Dept Astrophys Geophys & Oceanog, B-4000 Cointe Ougree, Belgium

来源：

ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES | 2016年 / 226卷 / 01期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

catalogs; planets and satellites: fundamental parameters; planets and satellites: general; techniques: high angular resolution; techniques: photometric; techniques: spectroscopic; EARTH-SIZE PLANETS; ADAPTIVE OPTICS; HOT JUPITER; TRANSIT CANDIDATES; ECLIPSING BINARIES; KEPLER OBJECTS; SUPER-EARTH; M DWARFS; BLEND SCENARIOS; PAN-STARRS;

D O I：

10.3847/0067-0049/226/1/7

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present 197 planet candidates discovered using data from the first year of the NASA K2 mission (Campaigns 0-4), along with the results of an intensive program of photometric analyses, stellar spectroscopy, high-resolution imaging, and statistical validation. We distill these candidates into sets of 104 validated planets (57 in multi-planet systems), 30 false positives, and 63 remaining candidates. Our validated systems span a range of properties, with median values of R-P = 2.3 R-circle plus, P = 8.6 days, T-eff = 5300 K, and Kp = 12.7 mag. Stellar spectroscopy provides precise stellar and planetary parameters for most of these systems. We show that K2 has increased by 30% the number of small planets known to orbit moderately bright stars (1-4 R-circle plus, Kp = 9-13. mag). Of particular interest are 76 planets smaller than 2 R-circle plus, 15 orbiting stars brighter than Kp = 11.5. mag, 5 receiving Earth-like irradiation levels, and several multi-planet systems-including 4 planets orbiting the M dwarf K2-72 near mean-motion resonances. By quantifying the likelihood that each candidate is a planet we demonstrate that our candidate sample has an overall false positive rate of 15%-30%, with rates substantially lower for small candidates (<2 R-circle plus) and larger for candidates with radii >8 R-circle plus and/or with P < 3 days. Extrapolation of the current planetary yield suggests that K2 will discover between 500 and 1000 planets in its planned four-year mission, assuming sufficient follow-up resources are available. Efficient observing and analysis, together with an organized and coherent follow-up strategy, are essential for maximizing the efficacy of planet-validation efforts for K2, TESS, and future large-scale surveys.

引用

页数：20

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