The University of New South Wales Extrasolar Planet Search: methods and first results from a field centred on NGC 6633

Hidas, M. G.; Ashley, M. C. B.; Webb, John R.; Irwin, M. J.; Phillips, A.; Toyozumi, Hiroyuki; Derekas, A.; Christiansen, Jessie L.; Nutto, C.; Crothers, S. R.

doi:10.1111/j.1365-2966.2005.09061.x

Cited by 50 publications

(17 citation statements)

References 61 publications

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“…It is dedicated to an Extrasolar Planet Search, the details of which can be found in Hidas et al (2005). From February to March 2005 we observed a pair of fields centred on 12h RA, −36…”

Section: Latest Resultsmentioning

confidence: 99%

Searching for Extrasolar Planets from UNSW

Christiansen¹,

Ashley²,

Hidas³

et al. 2005

Proc. IAU

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Abstract. The Automated Patrol Telescope, operated by the University of New South Wales, has been undertaking a search for extrasolar planets using the transit method. We present lightcurves from two recent promising candidates; spectroscopic follow-up using the ANU 2.3m telescope shows that the companions are probably low mass stars rather than planets, although more data will be needed to be certain. Additionally, we outline future improvements to our transit search: a hardware upgrade scheduled for 2006, and the addition of a robust trend-filtering algorithm to the data reduction software.

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“…It is dedicated to an Extrasolar Planet Search, the details of which can be found in Hidas et al (2005). From February to March 2005 we observed a pair of fields centred on 12h RA, −36…”

Section: Latest Resultsmentioning

confidence: 99%

Searching for Extrasolar Planets from UNSW

Christiansen¹,

Ashley²,

Hidas³

et al. 2005

Proc. IAU

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“…We have used a customized aperture photometry data-reduction pipeline to construct our target light curves. A full explanation of the transit search and the data-reduction process can be found in Hidas et al (2005). The results of the project include the discovery of a new eclipsing system of K7 dwarf components (Young et al 2006).…”

Section: Photometrymentioning

confidence: 99%

The first high-amplitude Scuti star in an eclipsing binary system

Christiansen

Derekas

Ashley

et al. 2007

Monthly Notices of the Royal Astronomical Society

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We report the discovery of the first high-amplitude δ Scuti star in an eclipsing binary, which we have designated UNSW-V-500. The system is an Algol-type semi-detached eclipsing binary of maximum brightness V = 12.52 mag. A best-fitting solution to the binary light curve and two radial velocity curves is derived using the Wilson-Devinney code. We identify a late-A spectral-type primary component of mass 1.49 ± 0.02 M and a late-K spectral-type secondary of mass 0.33 ± 0.02 M , with an inclination of 86.• 5 ± 1.• 0, and a period of 5.350 4751 ± 0.000 0006 d. A Fourier analysis of the residuals from this solution is performed using PERIOD04 to investigate the δ Scuti pulsations. We detect a single pulsation frequency of f 1 = 13.621 ± 0.015 cd −1 , and it appears that this is the first overtone radial mode frequency. This system provides the first opportunity to measure the dynamical mass for a star of this variable type; previously, masses have been derived from stellar evolution and pulsation models.

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“…Light curves were extracted using a custom-built automated reduction pipeline. For more information about the telescope, the data and the reduction process, see Hidas et al (2005).…”

Section: Photometrymentioning

confidence: 99%

“…In this paper, we report the discovery and preliminary analysis of a new detached, double-lined eclipsing binary system with K7 Ve components. The system was detected in data obtained for the University of New South Wales (UNSW) Extrasolar Planet Search (Hidas et al 2005). The eclipses are grazing, and their depths were diluted by light from a brighter, blended star.…”

Section: Introductionmentioning

confidence: 99%

A new detached K7 dwarf eclipsing binary system

Young

Hidas

Webb

et al. 2006

Monthly Notices of the Royal Astronomical Society

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We present an analysis of a new, detached, double-lined eclipsing binary system with K7 Ve components, discovered as part of the University of New South Wales Extrasolar Planet Search. The object is significant in that only 6 other binary systems are known with comparable or lower mass. Such systems offer important tests of mass-radius theoretical models. Follow-up photometry and spectroscopy were obtained with the 40-inch and 2.3m telescopes at SSO respectively. An estimate of the radial velocity amplitude from spectral absorption features, combined with the orbital inclination (83.5 deg) estimated from lightcurve fitting, yielded a total mass of M=(1.041 +/- 0.06)M_sun and component masses of M_A=(0.529 +/- 0.035)M_sun and M_B=(0.512 +/- 0.035)M_sun. The radial velocity amplitude estimated from absorption features (167 +/- 3)kmps was found to be less than the estimate from the H_alpha emission lines (175 +/- 1.5)kmps. The lightcurve fit produced radii of R_A=(0.641 +/- 0.05)R_sun and R_B=(0.608 +/- 0.06)R_sun, and a temperature ratio of T_B/T_A=0.980 +/- 0.015. The apparent magnitude of the binary was estimated to be V=13.9 +/- 0.2. Combined with the spectral type, this gave the distance to the binary as 169 +/- 14 pc. The timing of the secondary eclipse gave a lower limit on the eccentricity of the binary system of 0.0025 +/- 0.0005. This is the most statistically significant non-zero eccentricity found for such a system, possibly suggesting the presence of a third companion.Comment: 6 pages, published in MNRAS (08/2006

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The University of New South Wales Extrasolar Planet Search: methods and first results from a field centred on NGC 6633

Cited by 50 publications

References 61 publications

Searching for Extrasolar Planets from UNSW

Searching for Extrasolar Planets from UNSW

The first high-amplitude Scuti star in an eclipsing binary system

A new detached K7 dwarf eclipsing binary system

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