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The frequency of low-mass exoplanets III. Toward eta-Earth at short periods
(2011-09)
Determining the occurrence rate of "super-Earth" planets (m sin i < 10 M ) is a critically important step on the path toward determining the frequency of Earth-like planets (η), and hence the uniqueness of our solar system. ...
Application of Bayesian model inadequacy criterion for multiple data sets to radial velocity models of exoplanet systems
(2011-08)
We present a simple mathematical criterion for determining whether a given statistical model does not describe several independent sets of measurements, or data modes, adequately. We derive this criterion for two data sets ...
The properties of the T8.5p dwarf Ross 458C
(2011-07)
We present near-infrared photometry and spectroscopy, and warm-Spitzer IRAC photometry of the young very cool T dwarf Ross 458C, which we have typed as T8.5p. By applying the fiducial age constraints (<= 1 Gyr) imposed by ...
Blue not brown: UKIRT Infrared Deep Sky Survey T dwarfs with suppressed K-band flux
(2011-06)
We have used blue near-infrared colours to select a group of 12 spectroscopically confirmed United Kingdom InfraRed Telescope (UKIRT) Infrared Deep Sky Survey (UKIDSS) T dwarfs later than T4. From amongst these, we identify ...
The discovery of the T8.5 dwarf UGPS J0521+3640
(2011-06)
We have carried out a search for late-type T dwarfs in the UKIRT Infrared Deep Sky Survey Galactic Plane Survey 6th Data Release. The search yielded two persuasive candidates, both of which have been confirmed as T dwarfs. ...
The Anglo-Australian planet search XXI : a gas-giant planet in a one year orbit and the habitability of gas-giant satellites
(2011-05-01)
We have detected the Doppler signature of a gas-giant exoplanet orbiting the star HD 38283, in an eccentric orbit with a period of almost exactly one year (P = 363.2 +/- 1.6 d, m sin i = 0.34 +/- 0.02 M-Jup, e = 0.41 +/- ...
The effect of M dwarf starspot activity on low-mass planet detection thresholds
(2011-04)
In light of the growing interest in searching for low mass, rocky planets, we investigate the impact of starspots on radial velocity searches for earth-mass planets in orbit about M dwarf stars. Since new surveys targeting ...
Parallaxes of southern extremely cool objects. I. : Targets, proper motions, and first results
(2011)
We present results from the PARallaxes of Southern Extremely Cool objects ( PARSEC) program, an observational program begun in 2007 April to determine parallaxes for 122 L and 28 T southern hemisphere dwarfs using the Wide ...
Infrared Mn I laboratory oscillator strengths for the study of late type stars and ultracool dwarfs
(2011)
Aims: The aim of our new laboratory measurements is to measure accurate absolute oscillator strengths for neutral manganese transitions in the infrared needed for the study of late-type stars and ultracool dwarfs. Methods: ...
Chromospheric activities and kinematics for solar type dwarfs and subgiants : analysis of the activity distribution and the AVR
(2011)
Aims : In this work we present chromospheric activity indices, kinematics, radial-velocities, and rotational velocities for more than 850 FGK-type dwarfs and subgiant stars in the southern hemisphere and test how best to ...