SETI public: Latest papers on exoplanet transits and circumstellar disks

• Previous message: LARRY KLAES: "SETI public: A planetary system as the origin of structure in Fomalhaut's dust belt"

Paper: astro-ph/0506569
Date: Fri, 24 Jun 2005 13:47:39 GMT (132kb)

Title: High-precision Transit Photometry of OGLE-TR-10

Authors: Matthew J. Holman, Joshua N. Winn, K.Z. Stanek, Guillermo Torres,
Dimitar D. Sasselov, R. Lynne Allen, Wesley Fraser
Comments: Submitted to ApJ Letters [9 pg, 2 figs]
\\
We present B and I photometry of OGLE-TR-10 during transits of its giant
planet. From our observations, we estimate the radius of the planet to be
1.16
+/- 0.05 times the radius of Jupiter, assuming a stellar mass of 1.02 solar
masses. This is smaller than previous estimates that were based on
lower-precision data, and hence the planet is not as anomalous as was once
believed. We provide updated determinations of all the system parameters
based
on a joint analysis of our photometry and the star's radial velocity
variations.

\\ ( http://arXiv.org/abs/astro-ph/0506569 , 132kb)

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Paper: astro-ph/0506585
Date: Fri, 24 Jun 2005 12:42:56 GMT (126kb)

Title: Size distribution of circumstellar disks in the Trapezium cluster

Authors: S. Vicente (1 and 2) and J. Alves (1) ((1) ESO, Germany, (2) FCUL,
Lisboa, Portugal)
Comments: 11 pages (excluding Table 3), 8 figures, 3 Tables. Table 3 and
paper
available at http://www.eso.org/~svicente/paper_aa3540/
\\
In this paper we present results on the size distribution of circumstellar
disks in the Trapezium cluster as measured from HST/WFPC2 data. Direct
diameter
measurements of a sample of 135 bright proplyds and 14 silhouettes disks
suggest that there is a single population of disks well characterized by a
power-law distribution with an exponent of -1.9 +- 0.3 between disk
diameters
100-400 AU. For the stellar mass sampled (from late G to late M stars) we
find
no obvious correlation between disk diameter and stellar mass. We also find
that there is no obvious correlation between disk diameter and the projected
distance to the ionizing Trapezium OB stars. We estimate that about 40% of
the
disks in the Trapezium have radius larger than 50 AU. We suggest that the
origin of the Solar system's (Kuiper belt) outer edge is likely to be due to
the star formation environment and disk destruction processes
(photoevaporation, collisions) present in the stellar cluster on which the
Sun
was probably formed. Finally, we identified a previously unknown proplyd and
named it 266-557, following convention.

\\ ( http://arXiv.org/abs/astro-ph/0506585 , 126kb)

• Previous message: LARRY KLAES: "SETI public: A planetary system as the origin of structure in Fomalhaut's dust belt"

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