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The Science of Exoplanets - Finding & Understanding our Planetary Neighbours

Title
The Science of Exoplanets - Finding & Understanding our Planetary Neighbours
Funding
ARC | Discovery Projects
Contract (GA) number
DP0774000
Start Date
2007/01/01
End Date
2011/12/31
Open Access mandate
no
Organizations
-
More information
http://purl.org/au-research/grants/arc/DP0774000

 

  • The discovery of the T8.5 dwarf UGPS J0521+3640

    Burningham, Ben; Lucas, P. W.; Leggett, S. K.; Smart, R.; Baker, D.; Pinfield, D. J.; Tinney, C. G.; Homeier, D.; Allard, F.; Zhang, Z. H.; Gomes, J.; Day-Jones, A. C.; Jones, H. R. A.; Kovacs, G.; Lodieu, N.;... (2011)
    Projects: ARC | The Science of Exoplanets - Finding & Understanding our Planetary Neighbours (DP0774000)
    We have carried out a search for late-type T dwarfs in the UKIDSS Galactic Plane Survey 6th Data Release. The search yielded two persuasive candidates, both of which have been confirmed as T dwarfs. The brightest, UGPS J0521+3640 has been assigned the spectral type T8.5 and appears to lie at a distance of 7-9 pc. The fainter of the two, UGPS J0652+0324, is classified as a T5.5 dwarf, and lies at an estimated distance of 28-37 pc. Warm-Spitzer observations in IRAC channels 1 and 2, taken as pa...

    Resonances Required: Dynamical Analysis of the 24 Sex and HD 200964 Planetary Systems

    Wittenmyer, Robert A.; Horner, Jonathan; Tinney, C. G. (2012)
    Projects: ARC | The Science of Exoplanets - Finding & Understanding our Planetary Neighbours (DP0774000)
    We perform several suites of highly detailed dynamical simulations to investigate the architectures of the 24 Sextantis and HD 200964 planetary systems. The best fit orbital solution for the two planets in the 24 Sex system places them on orbits with periods that lie very close to 2:1 commensurability, while that for the HD 200964 system places the two planets therein in orbits whose periods lie close to a 4:3 commensurability. In both cases, the proposed best-fit orbits are mutually crossing...

    A Second Giant Planet in 3:2 Mean-Motion Resonance in the HD 204313 System

    Robertson, Paul; Horner, J.; Wittenmyer, Robert A.; Endl, Michael; Cochran, William D.; MacQueen, Phillip J.; Brugamyer, Erik J.; Simon, Attila E.; Barnes, Stuart I.; Caldwell, Caroline (2012)
    Projects: ARC | The Science of Exoplanets - Finding & Understanding our Planetary Neighbours (DP0774000)
    We present 8 years of high-precision radial velocity (RV) data for HD 204313 from the 2.7 m Harlan J. Smith Telescope at McDonald Observatory. The star is known to have a giant planet (M sin i = 3.5 M_J) on a ~1900-day orbit, and a Neptune-mass planet at 0.2 AU. Using our own data in combination with the published CORALIE RVs of Segransan et al. (2010), we discover an outer Jovian (M sin i = 1.6 M_J) planet with P ~ 2800 days. Our orbital fit suggests the planets are in a 3:2 mean motion reso...

    On the Frequency of Jupiter Analogs

    Wittenmyer, Robert A.; Tinney, C. G.; O'Toole, Simon J.; Jones, H. R. A.; Butler, R. P.; Carter, B. D.; Bailey, J. (2010)
    Projects: ARC | The Science of Exoplanets - Finding & Understanding our Planetary Neighbours (DP0774000)
    The Anglo-Australian Planet Search has now accumulated 12 years of radial-velocity data with long-term instrumental precision better than 3 m/s. In this paper, we expand on earlier simulation work, to probe the frequency of near-circular, long-period gas-giant planets residing at orbital distances of 3-6 AU -- the so-called "Jupiter analogs." We present the first comprehensive analysis of the frequency of these objects based on radial-velocity data. We find that 3.3% of stars in our sample ho...

    WISE J163940.83-684738.6: A Y Dwarf identified by Methane Imaging

    Tinney, C. G.; Faherty, Jacqueline K.; Kirkpatrick, J. Davy; Wright, Edward L.; Gelino, Christopher R.; Cushing, Michael C.; Griffith, Roger L.; Salter, Graeme (2012)
    Projects: ARC | The Science of Exoplanets - Finding & Understanding our Planetary Neighbours (DP0774000)
    We have used methane imaging techniques to identify the near-infrared counterpart of the bright Wide-field Infrared Survey Explorer (WISE) source WISE J163940.83–684738.6. The large proper motion of this source (≈3."0 yr^(–1)) has moved it, since its original WISE identification, very close to a much brighter background star—it currently lies within 1farcs5 of the J = 14.90 ± 0.04 star 2MASS 16394085–6847446. Observations in good seeing conditions using methane-sensitive filters in the near-i...

    Cyclic Transit Probabilities of Long-Period Eccentric Planets Due to Periastron Precession

    Kane, Stephen R.; Horner, Jonathan; von Braun, Kaspar (2012)
    Projects: ARC | The Science of Exoplanets - Finding & Understanding our Planetary Neighbours (DP0774000)
    The observed properties of transiting exoplanets are an exceptionally rich source of information that allows us to understand and characterize their physical properties. Unfortunately, only a relatively small fraction of the known exoplanets discovered using the radial velocity technique are known to transit their host, due to the stringent orbital geometry requirements. For each target, the transit probability and predicted transit time can be calculated to great accuracy with refinement of ...

    The discovery of a very cool binary system

    Burningham, Ben; Leggett, S. K.; Lucas, P. W.; Pinfield, D. J.; Smart, R. L.; Day-Jones, A. C.; Jones, H. R. A.; Murray, D.; Nickson, E.; Tamura, M.; Zhang, Z.; Lodieu, N.; Tinney, C. G.; Osorio, M. R. Zapatero (2010)
    Projects: ARC | The Science of Exoplanets - Finding & Understanding our Planetary Neighbours (DP0774000)
    We report the discovery of a very cool d/sdL7+T7.5p common proper motion binary system, SDSS J1416+13AB, found by cross-matching the UKIDSS Large Area Survey Data Release 5 against the Sloan Digital Sky Survey Data Release 7. The d/sdL7 is blue in J-H and H-K and has other features suggestive of low-metallicity and/or high gravity. The T7.5p displays spectral peculiarity seen before in earlier type dwarfs discovered in UKIDSS LAS DR4, and referred to as CH4-J-early peculiarity. We suggest tha...

    The Impact of Stellar Oscillations on Doppler Velocity Planet Searches

    O'Toole, S. J.; Tinney, C. G.; Jones, H. R. A. (2007)
    Projects: ARC | The Science of Exoplanets - Finding & Understanding our Planetary Neighbours (DP0774000)
    We present a quantitative investigation of the effect of stellar oscillations on Doppler velocity planet searches. Using data from four asteroseismological observation campaigns, we find a power law relationship between the noise impact of these oscillations on Doppler velocities and both the luminosity-to-mass of the target stars, and observed integration times. Including the impact of oscillation jitter should improve the quality of Keplerian fits to Doppler velocity data. The scale of the ...

    Revisiting the proposed circumbinary multi-planet system NSVS14256825

    Hinse, Tobias C.; Lee, Jae Woo; Gozdziewski, Krzysztof; Horner, Jonathan; Wittenmyer, Robert A. (2013)
    Projects: ARC | The Science of Exoplanets - Finding & Understanding our Planetary Neighbours (DP0774000)
    In this work we carry out an analysis of the observed times of primary and secondary eclipses of the post-common envelope binary NSVS14256825. Recently, \cite{Almeida2013} proposed that two circumbinary companions orbit this short-period eclipsing binary, in order to explain observed variations in the timing of mutual eclipses between the two binary components. Using a standard weighted least-squares minimisation technique, we have extensively explored the topology of $\chi^2$ parameter space...

    The Anglo-Australian Planet Search. XXII. Two New Multi-Planet Systems

    Wittenmyer, Robert A.; Horner, J.; Tuomi, M.; Salter, G. S.; Tinney, C. G.; Butler, R. P.; Jones, H. R. A.; O'Toole, S. J.; Bailey, J.; Carter, B. D.; Jenkins, J. S.; Zhang, Z.; Vogt, S. S.; Rivera, E. J. (2012)
    Projects: ARC | The Science of Exoplanets - Finding & Understanding our Planetary Neighbours (DP0774000)
    We report the detection of two new planets from the Anglo-Australian Planet Search. These planets orbit two stars each previously known to host one planet. The new planet orbiting HD 142 has a period of 6005\pm427 days, and a minimum mass of 5.3M_Jup. HD142c is thus a new Jupiter analog: a gas-giant planet with a long period and low eccentricity (e = 0.21 \pm 0.07). The second planet in the HD 159868 system has a period of 352.3\pm1.3 days, and m sin i=0.73\pm0.05 M_Jup. In both of these syst...
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