Anglo-Australian Rocky Planet Search and Exoplanet Mass Function

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Anglo-Australian Rocky Planet Search and Exoplanet Mass Function

Post by Borislav on 21st April 2009, 1:42 pm

http://star.herts.ac.uk/ewass/abstracts.pdf
An Exoplanet Mass Function from the Anglo-Australian Planet Search
H. Jones (University of Hertfordshire), O'Toole, S., Tinney, C., Butler, R.P., Bailey, J.
We report on a 48 night run with the Anglo-Australian Telescope. On this run we targeted 24 bright, nearby and intrinsically stable Sun-like stars selected from the Anglo-Australian Planet Search's main sample. we have Monte-Carlo simulated the data from this run on a star-bystar basis to produce robust detection constraints. These simulations demonstrate clear differences in the exoplanet detectability functions from star to star due to differences in sampling, data quality and intrinsic stellar stability. They reinforce the importance of star-bystar simulation when interpreting the data from Doppler planet searches. The two low-mass planets we discover in our 24 star sample indicate that the exoplanet minimum mass function at low masses is likely to be a flat, a=-1 (for dN/dM = M^a) and that ~17 +/- 12 % of stars host planets with orbital periods of less than 16 days and minimum masses greater than 3 Earth masses.
Discovery of the Geneva group (summer 2008) of high frequency small-mass and small-period planets confirmed?

Why "The two low-mass planets we discover in our 24 star sample" ?

http://arxiv.org/abs/0902.4024
Precision Doppler measurements from an intensive 48 night "Rocky Planet Search" observing campaign on the Anglo-Australian Telescope (AAT) have revealed the presence of a low-mass exoplanet orbiting the G1 dwarf HD16417

The second unpublished hot neptun or super-Earth ?

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Re: Anglo-Australian Rocky Planet Search and Exoplanet Mass Function

Post by Borislav on 21st April 2009, 1:51 pm

http://arxiv.org/abs/astro-ph/0702213
Thirty planets have now emerged from the 260 target stars of the AAPS, suggesting that 10% of late F, G, and K field dwarfs have planets that can be detected with Doppler precisions of 3ms−1 and a time baseline of 8 years (a similar detection rate to that of the original 106 stars on the Lick Observatory survey which has yielded 13 planets to date; Fischer et al. 2003). These surveys are now beginning to explore planets in orbits beyond 4AU, though they remain insensitive to terrestrial mass planets beyond 0.1AU and neptune-mass planets beyond 1AU. However, with planets being found orbiting more than 10% of nearby sun-like stars, it seems that planetary systems are common.

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Re: Anglo-Australian Rocky Planet Search and Exoplanet Mass Function

Post by Sirius_Alpha on 21st April 2009, 4:01 pm

The low mass planet orbiting HD 16417 is this Neptune-mass planet discussed here:
http://solar-flux.forumandco.com/extrasolar-news-and-discoveries-f2/neptune-mass-planet-at-lam2-fornacis-t267.htm

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