Kepler-22b: A 2.4 Earth-radius Planet in the Habitable Zone of a Sun-like Star
Kepler-22b: A 2.4 Earth-radius Planet in the Habitable Zone of a Sun-like Star
A search of the time-series photometry from NASA's Kepler spacecraft reveals a transiting planet candidate orbiting the 11th magnitude G5 dwarf KIC 10593626 with a period of 290 days. The characteristics of the host star are well constrained by high-resolution spectroscopy combined with an asteroseismic analysis of the Kepler photometry, leading to an estimated mass and radius of 0.970 +/- 0.060 MSun and 0.979 +/- 0.020 RSun. The depth of 492 +/- 10ppm for the three observed transits yields a radius of 2.38 +/- 0.13 REarth for the planet. The system passes a battery of tests for false positives, including reconnaissance spectroscopy, high-resolution imaging, and centroid motion. A full BLENDER analysis provides further validation of the planet interpretation by showing that contamination of the target by an eclipsing system would rarely mimic the observed shape of the transits. The final validation of the planet is provided by 16 radial velocities obtained with HIRES on Keck 1 over a one year span. Although the velocities do not lead to a reliable orbit and mass determination, they are able to constrain the mass to a 3{\sigma} upper limit of 124 MEarth, safely in the regime of planetary masses, thus earning the designation Kepler-22b. The radiative equilibrium temperature is 262K for a planet in Kepler-22b's orbit. Although there is no evidence that Kepler-22b is a rocky planet, it is the first confirmed planet with a measured radius to orbit in the Habitable Zone of any star other than the Sun.
Natalie Batalha、Edna DeVore、Jack J. Lissauer、Torben Arentoft、William F. Welsh、Geoffrey W. Marcy、Jason Rowe、Timothy R. Bedding、Alan Gould、Christopher Henze、Andrea K. Dupree、Jill Tarter、Guillermo Torres、Steve B. Howell、Samuel N. Quinn、Fergal Mullally、Josh Carter、Andrea Miglio、Matthew J. Holman、Andrej Prsa、Graham Verner、Lars A. Buchhave、Jonathan Fortney、Jason A. Steffen、Joseph D. Twicken、Douglas A. Caldwell、Alan Boss、Dimitar Sasselov、Todd Klaus、Steve Kawaler、Jeffery Kolodziejczak、Sarah Ballard、Jon M. Jenkins、Ronald Gilliland、William J. Borucki、Courtney Dressing、Yvonne Elsworth、Michael Endl、Francois Fressin、William Sherry、Daniel Fabrycky、Elisa V. Quintana、Bill Chaplin、Andrew W. Howard、Avi Shporer、David G. Koch、Peter Tenenbaum、David Ciardi、Lisa Kaltenegger、Laurance Doyle、Paul Robertson、William D. Cochran、J?rgen Christensen-Dalsgaard、Jeffrey Van Cleve、Jean-Michel D¨|sert、Mikkel Lund、Saskia Hekker、Martin Still、Rasmus Handberg、Elliott Horch、Dennis Stello、Thomas N. Gautier III、Hans Kjeldsen、Jessie L. Christiansen、Jie Li、Christoffer Karoff、Michael R. Haas、David Charbonneau、Mia Lundkvist、Daniel Huber、David W. Latham、Travis S. Metcalfe、John C. Geary、Debra Fischer、Brice-Olivier Demory、S?ren Meibom、Eric B. Ford、Thomas Barclay、John Asher Johnson、Howard Isaacson、Susan E. Thompson、Sarbani Basu、Stephen T. Bryson
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Natalie Batalha,Edna DeVore,Jack J. Lissauer,Torben Arentoft,William F. Welsh,Geoffrey W. Marcy,Jason Rowe,Timothy R. Bedding,Alan Gould,Christopher Henze,Andrea K. Dupree,Jill Tarter,Guillermo Torres,Steve B. Howell,Samuel N. Quinn,Fergal Mullally,Josh Carter,Andrea Miglio,Matthew J. Holman,Andrej Prsa,Graham Verner,Lars A. Buchhave,Jonathan Fortney,Jason A. Steffen,Joseph D. Twicken,Douglas A. Caldwell,Alan Boss,Dimitar Sasselov,Todd Klaus,Steve Kawaler,Jeffery Kolodziejczak,Sarah Ballard,Jon M. Jenkins,Ronald Gilliland,William J. Borucki,Courtney Dressing,Yvonne Elsworth,Michael Endl,Francois Fressin,William Sherry,Daniel Fabrycky,Elisa V. Quintana,Bill Chaplin,Andrew W. Howard,Avi Shporer,David G. Koch,Peter Tenenbaum,David Ciardi,Lisa Kaltenegger,Laurance Doyle,Paul Robertson,William D. Cochran,J?rgen Christensen-Dalsgaard,Jeffrey Van Cleve,Jean-Michel D¨|sert,Mikkel Lund,Saskia Hekker,Martin Still,Rasmus Handberg,Elliott Horch,Dennis Stello,Thomas N. Gautier III,Hans Kjeldsen,Jessie L. Christiansen,Jie Li,Christoffer Karoff,Michael R. Haas,David Charbonneau,Mia Lundkvist,Daniel Huber,David W. Latham,Travis S. Metcalfe,John C. Geary,Debra Fischer,Brice-Olivier Demory,S?ren Meibom,Eric B. Ford,Thomas Barclay,John Asher Johnson,Howard Isaacson,Susan E. Thompson,Sarbani Basu,Stephen T. Bryson.Kepler-22b: A 2.4 Earth-radius Planet in the Habitable Zone of a Sun-like Star[EB/OL].(2011-12-07)[2025-07-16].https://arxiv.org/abs/1112.1640.点此复制
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