K2-288Bb: A Small Temperate Planet in a Low-mass Binary System Discovered by Citizen Scientists

被引：17

作者：

Feinstein, Adina D. ^{[1
,2
]}

Schlieder, Joshua E. ^{[3
]}

Livingston, John H. ^{[4
]}

Ciardi, David R. ^{[5
]}

Howard, Andrew W. ^{[6
]}

Arnold, Lauren ^{[7
]}

Barentsen, Geert ^{[8
,9
]}

Bristow, Makennah ^{[10
]}

Christiansen, Jessie L. ^{[5
]}

Crossfield, Ian J. M. ^{[11
]}

Dressing, Courtney D. ^{[12
]}

Gonzales, Erica J. ^{[13
]}

Kosiarek, Molly ^{[13
]}

Lintott, Chris J. ^{[14
]}

Miller, Grant ^{[14
]}

Morales, Farisa Y. ^{[15
,16
]}

Petigura, Erik A. ^{[17
]}

Thackeray, Beverly ^{[18
]}

Ault, Joanne ^{[19
]}

Baeten, Elisabeth ^{[19
]}

Jonkeren, Alexander F. ^{[19
]}

Langley, James ^{[19
]}

Moshinaly, Houssen ^{[19
]}

Pearson, Kirk ^{[19
]}

Tanner, Christopher ^{[19
]}

Treasure, Joanna ^{[19
]}

机构：

[1] Tufts Univ, Dept Phys & Astron, Medford, MA 02155 USA

[2] Univ Chicago, Dept Astron & Astrophys, 5640 S Ellis Ave, Chicago, IL 60637 USA

[3] NASA, Exoplanets & Stellar Astrophys Lab, Goddard Space Flight Ctr, Code 667, Greenbelt, MD USA

[4] Univ Tokyo, Dept Astron, Bunkyo Ku, Tokyo 1130033, Japan

[5] CALTECH, IPAC, NASA, Exoplanet Sci Inst, M-S 100-22,770 S Wilson Ave, Pasadena, CA 91106 USA

[6] CALTECH, 1200 E Calif Blvd, Pasadena, CA 91125 USA

[7] Univ Virgin Isl, Ctr Marine & Environm Studies, St Thomas, VI USA

[8] NASA, Ames Res Ctr, Moffett Blvd, Mountain View, CA 94035 USA

[9] Bay Area Environm Res Inst, 625 2nd St Ste 209, Petaluma, CA 94952 USA

[10] Univ N Carolina, Dept Phys, Asheville, NC 28804 USA

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

[12] Univ Calif Berkeley, Berkeley, CA 94720 USA

[13] Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA

[14] Univ Oxford, Dept Phys, Denys Wilkingson Bldg,Keble Rd, Oxford OX1 3RH, England

[15] CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA

[16] Moorpk Coll, Dept Phys & Astron, 7075 Campus Rd, Moorpark, CA 93021 USA

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

[18] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

[19] Univ Oxford, Dept Phys, Citizen Scientists, Zooniverse, Denys Wilkingson Bldg,Keble Rd, Oxford OX1 3RH, England

来源：

ASTRONOMICAL JOURNAL | 2019年 / 157卷 / 02期

基金：

美国国家科学基金会; 美国国家航空航天局;

关键词：

binaries: close; planets and satellites: detection; planets and satellites: individual (EPIC210693462Bb; K2-288Bb); techniques: photometric; techniques: spectroscopic; VALIDATED PLANETS; T-DWARFS; STARS; SKY; CANDIDATES; PHOTOMETRY; SPECTRA; HUNTERS; SPEX;

D O I：

10.3847/1538-3881/aafa70

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Observations from the Kepler and K2 missions have provided the astronomical community with unprecedented amounts of data to search for transiting exoplanets and other astrophysical phenomena. Here, we present K2-288, a low-mass binary system (M2.0 +/- 1.0; M3.0 +/- 1.0) hosting a small (R-p = 1.9 R-circle plus), temperate (T-eq = 226 K) planet observed in K2 Campaign 4. The candidate was first identified by citizen scientists using Exoplanet Explorers hosted on the Zooniverse platform. Follow-up observations and detailed analyses validate the planet and indicate that it likely orbits the secondary star on a 31.39-day period. This orbit places K2-288Bb in or near the habitable zone of its low-mass host star. K2-288Bb resides in a system with a unique architecture, as it orbits at >0.1 au from one component in a moderate separation binary (a(proj) similar to 55 au), and further follow-up may provide insight into its formation and evolution. Additionally, its estimated size straddles the observed gap in the planet radius distribution. Planets of this size occur less frequently and may be in a transient phase of radius evolution. K2-288 is the third transiting planet system identified by the Exoplanet Explorers program and its discovery exemplifies the value of citizen science in the era of Kepler, K2, and the Transiting Exoplanet Survey Satellite.

引用

页数：14

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