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The same frequency of planets inside and outside open clusters of stars
Søren Meibom, Guillermo Torres, Francois Fressin +16
Most stars and their planets form in open clusters. Over 95 per cent of such clusters have stellar densities too low (less than a hundred stars per cubic parsec) to withstand inter…
The Roche limit for close-orbiting planets: Minimum density, composition constraints, and application to the 4.2-hour planet KOI 1843.03
Saul Rappaport, Roberto Sanchis-Ojeda, Leslie A. Rogers +2
The requirement that a planet must orbit outside of its Roche limit gives a lower limit on the planet's mean density. The minimum density depends almost entirely on the orbital per…
Kepler-68: Three Planets, One With a Density Between That of Earth and Ice Giants
Ronald L. Gilliland, Geoffrey W. Marcy, Jason F. Rowe +30
NASA's Kepler Mission has revealed two transiting planets orbiting Kepler-68. Follow-up Doppler measurements have established the mass of the innermost planet and revealed a third…
Spitzer Observations of GJ3470b: a Very Low-density Neptune-size Planet Orbiting a Metal-rich M dwarf
Brice-Olivier Demory, Guillermo Torres, Vasco Neves +13
We present Spitzer/IRAC 4.5-micron transit photometry of GJ3470b, a Neptune-size planet orbiting a M1.5 dwarf star with a 3.3-day period recently discovered in the course of the HA…