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2 Acta Astronomica

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Hot Jupiters and Central Cavities of Protoplanetary Disks

Starczewski S., Gawryszczak A. J., Wönsch R., Różyczka M.

Acta Astronomica

2007

Vol. 57, No. 2

123--138

We investigate numerically the orbital evolution of massive extrasolar planets within central cavities of their parent protoplanetary disks. Assuming that they arrive at the inner edge of the disk due to type II migration, we show that they spiral further in. We find that in magnetospheric cavities more massive planets stop migrating at a larger distance from the edge of the disk. This effect may qualitatively explain the correlation between masses and orbital periods found for massive planets with P shorter than 5 days.

CURious Variables Experiment (CURVE). CCD Photometry and Variable Stars in the Field of Open Cluster NGC 637

Pietrukowicz P., Olech A., Wiśniewski M., Kędzierski P., Mularczyk K., Złoczewski K., Starczewski S., Szaruga K.

Acta Astronomica

2006

Vol. 56, No. 3

267--275

We present VI photometry for the open cluster NGC 637 which is located in the Cassiopeia region. Morphology of cluster color-magnitude diagram indicates that it is a young object with age of a few million years. The apparent distance modulus of the cluster is 13.9<(m-M)V<14.3 mag, while reddening is 0.69