Observations of Jupiter and Star Nr. 363. Wash. Gen.-Cat. 1860

HAT-P-5b: A JUPITER-LIKE HOT JUPITER TRANSITING A BRIGHT STAR

We report the discovery of a planet transiting a moderately bright (V = 12.00) G star, with an orbital period of 2.788491± 0.000025 days. From the transit light curve we determine that the radius of the planet is Rp = 1.257± 0.053RJup. HAT-P-5b has a mass of Mp = 1.06± 0.11MJup, similar to the average mass of previously-known transiting exoplanets, and a density of ρp = 0.66± 0.11 g cm. We find...

New Jupiter and Saturn formation models meet observations

The wealth of observational data about Jupiter and Saturn provides strong constraints to guide our understanding of the formation of giant planets. The size of the core and the total amount of heavy elements in the envelope have been derived from internal structure studies by Saumon & Guillot (2004). The atmospheric abundance of some volatile elements has been measured in situ by the Galileo pr...

Voyager Spacecraft Radio Observations of Jupiter: Initial Cruise Results

Cluster and Double Star observations of dipolarization

We studied two types of dipolarization events with different IMF conditions when Cluster and Double Star (TC1) were located in the same local time sector: 7 August 2004, 18:00–24:00 UT, during a disturbed southward/northward IMF interval, and 14 August 2004, 21:00–24:00 UT, when the IMF was stably northward. Cluster observed dipolarization as well as fast flows during both intervals, but this w...

Observations and Theory of Star Cluster Formation

Young stars form on a wide range of scales, producing aggregates and clusters with various degrees of gravitational self-binding. The loose aggregates have a hierarchical structure in both space and time that resembles interstellar turbulence, suggesting that these stars form in only a few turbulent crossing times with positions that map out the previous gas distribution. Dense clusters, on the...