DISCOVERY AND VALIDATION OF Kepler-452b: A 1.6 Rφ SUPER EARTH EXOPLANET IN THE HABITABLE ZONE OF A G2 STAR

被引：83

作者：

Jenkins, Jon M. ^{[1
]}

Twicken, Joseph D. ^{[1
,2
]}

Batalha, Natalie M. ^{[1
]}

Caldwell, Douglas A. ^{[1
,2
]}

Cochran, William D. ^{[3
,4
]}

Endl, Michael ^{[3
,4
]}

Latham, David W. ^{[5
]}

Esquerdo, Gilbert A. ^{[5
]}

Seader, Shawn ^{[1
,2
]}

Bieryla, Allyson ^{[5
]}

Petigura, Erik ^{[6
]}

Ciardi, David R. ^{[7
]}

Marcy, Geoffrey W. ^{[6
]}

Isaacson, Howard ^{[6
]}

Huber, Daniel ^{[2
,8
,9
]}

Rowe, Jason F. ^{[1
,2
]}

Torres, Guillermo ^{[5
]}

Bryson, Stephen T. ^{[1
]}

Buchhave, Lars ^{[5
,10
]}

Ramirez, Ivan ^{[3
,4
]}

Wolfgang, Angie ^{[11
]}

Li, Jie ^{[1
,2
]}

Campbell, Jennifer R. ^{[12
]}

Tenenbaum, Peter ^{[1
,2
]}

Sanderfer, Dwight ^{[1
]}

Henze, Christopher E. ^{[1
]}

Catanzarite, Joseph H. ^{[1
,2
]}

Gilliland, Ronald L. ^{[13
]}

Borucki, William J. ^{[1
]}

机构：

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

[2] SETI Inst, Mountain View, CA 94043 USA

[3] Univ Texas Austin, McDonald Observ, Austin, TX 78712 USA

[4] Univ Texas Austin, Dept Astron, Austin, TX 78712 USA

[5] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

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

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

[8] Univ Sydney, Sch Phys, Sydney Inst Astron SIfA, Sydney, NSW 2006, Australia

[9] Aarhus Univ, Dept Phys & Astron, Stellar Astrophys Ctr, DK-8000 Aarhus C, Denmark

[10] Univ Copenhagen, Nat Hist Museum Denmark, Ctr Star & Planet Format, DK-1350 Copenhagen, Denmark

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

[12] NASA, Wyle Labs, Ames Res Ctr, Moffett Field, CA 94035 USA

[13] Penn State Univ, Ctr Exoplanets & Habitable Worlds, University Pk, PA 16802 USA

来源：

ASTRONOMICAL JOURNAL | 2015年 / 150卷 / 02期

基金：

美国国家科学基金会;

关键词：

methods: statistical; planets and satellites: detection; stars: fundamental parameters; stars:; individual; (Kepler-452b; KIC; 8311864; KOI7016.01); POTENTIAL TRANSIT SIGNALS; FALSE POSITIVES; SOPHIE VELOCIMETRY; PLANETARY SYSTEM; BLEND SCENARIOS; HARPS SEARCH; CANDIDATES; COMPANION; IDENTIFICATION; QUARTERS;

D O I：

10.1088/0004-6256/150/2/56

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on the discovery and validation of Kepler-452b, a transiting planet identified by a search through the 4 years of data collected by NASA's Kepler Mission. This possibly rocky 1.63(-0.20)(+0.23) R-circle plus every 384.843 (+0.007)(-0.012) days, the longest orbital period for a small (R-P < 2 R-circle plus) transiting exoplanet to date. The likelihood that this planet has a rocky composition lies between 49% and 62%. The star has an effective temperature of 5757 +/- 85 K and a log g of 4.32 +/- 0.09. At a mean orbital separation of 1.046 (-0.015) (+0.019) AU, this small planet is well within the optimistic habitable zone of its star (recent Venus/early Mars), experiencing only 10% more flux than Earth receives from the Sun today, and slightly outside the conservative habitable zone (runaway greenhouse/maximum greenhouse). The star is slightly larger and older than the Sun, with a present radius of 1.11 (-0.09) (+0.15) R-circle dot and an estimated age of similar to 6 Gyr. Thus, Kepler-452b has likely always been in the habitable zone and should remain there for another similar to 3 Gyr.

引用

页数：19

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