Kepler: a space mission to detect earth-class exoplanets

With the detection of giant extrasolar planets and the quest for life on Mars, there is heightened interset in finding earth-class planets, those that are less than ten earth masses and might be life supporting. A space-based photometer has the ability to detect the periodic transits of earth-class planets for a wide variety of spectral types of stars. From the data and known type of host star, the orbital semi-major axis, size and characteristic temperature of each planet can be calculated. The frequency of planet formation with respect to spectral type and occurrence for both singular and multiple-stellar systems can be determined. A description is presented of a one-meter aperture photometer with a twelve-degree field of view and a focal plane of 21 CCDs. The photometer woudl continuously and simultaneously monitor 160,000 stars of visual magnitude <EQ 14. Its one-sigma system sensitivity for a transit of a 12th magnitude solar-like star by a planet of one-earth radius would be one part in 50,000. It is anticipated that about 480 earth-class planets would be detected along with 140 giant planets in transit and 1400 giant planets by reflected light. Densities could be derived for about seven case where the planet is seen in transit and radial velocities are measurable.

[1]  Jon M. Jenkins,et al.  High Precision Photometry with Back-Illuminated CCDs , 1996 .

[2]  R. Paul Butler,et al.  A Planet Orbiting 47 Ursae Majoris , 1996 .

[3]  A. Wolszczan,et al.  Confirmation of Earth-Mass Planets Orbiting the Millisecond Pulsar PSR B1257 + 12 , 1994, Science.

[4]  Giorgio Abetti,et al.  The exploration of the universe , 1968 .

[5]  H. Hudson,et al.  The Sun's luminosity over a complete solar cycle , 1991, Nature.

[6]  William J. Borucki,et al.  The photometric method of detecting other planetary systems , 1984 .

[7]  Charles F. Lillie,et al.  A Road Map for the Exploration of Neighboring Planetary Systems (ExNPS) , 1996 .

[8]  Laurance R. Doyle,et al.  The photometric method of extrasolar planet detection revisited , 1992 .

[9]  W. D. Cochran,et al.  The Discovery of a Planetary Companion to 16 Cygni B , 1997 .

[10]  George W. Wetherill,et al.  The Formation and Habitability of Extra-Solar Planets , 1996 .

[11]  M. Mayor,et al.  A Jupiter-mass companion to a solar-type star , 1995, Nature.

[12]  L. B. Robinson,et al.  TEST OF CCD PRECISION LIMITS FOR DIFFERENTIAL PHOTOMETRY , 1995 .

[13]  J. Kasting,et al.  Habitable zones around main sequence stars. , 1993, Icarus.

[14]  Larry D. Petro,et al.  A search for solar-like oscillations in the stars of M67 , 1993 .

[15]  Geoffrey Marcy,et al.  Worlds Unnumbered: The Search for Extrasolar Planets , 1997 .

[16]  Jon M. Jenkins,et al.  Fresip: A mission to determine the character and frequency of extra-solar planets around solar-like stars , 1996, Astrophysics and Space Science.

[17]  G. Marcy,et al.  A Planetary Companion to 70 Virginis , 1996 .

[18]  R. Paul Butler,et al.  DETECTION OF EXTRASOLAR GIANT PLANETS , 1998 .

[19]  Kent Cullers,et al.  System design of a mission to detect Earth-sized planets in the inner orbits of solar-like stars , 1996 .

[20]  Jack J. Lissauer,et al.  Urey Prize Lecture: On the Diversity of Plausible Planetary Systems , 1995 .

[21]  Saurabh Jha,et al.  2 4 A pr 1 99 7 A Planet Orbiting the Star Rho Coronae Borealis , 1997 .

[22]  William J. Borucki,et al.  A SEARCH FOR EARTH-SIZED PLANETS IN HABITABLE ZONES USING PHOTOMETRY , 1996 .

[23]  R. Paul Butler,et al.  Three New “51 Pegasi-Type” Planets , 1997 .

[24]  William J. Borucki,et al.  Astrophysical science with a spaceborne photometric telescope , 1994 .