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An extremely high photometric precision in ground-based observations of two transits in the WASP-50 planetary system (2013)
Journal Article
Tregloan-Reed, J., & Southworth, J. (2013). An extremely high photometric precision in ground-based observations of two transits in the WASP-50 planetary system. Monthly Notices of the Royal Astronomical Society, 431(1), 966-971. https://doi.org/10.1093/mnras/stt227

We present photometric observations of two transits in the WASP-50 planetary system, obtained using the ESO New Technology Telescope and the defocused-photometry technique. The rms scatters for the two data sets are 258 and 211 ppm with a cadence of... Read More about An extremely high photometric precision in ground-based observations of two transits in the WASP-50 planetary system.

Multi-site campaign for transit timing variations of WASP-12 b: possible detection of a long-period signal of planetary origin (2013)
Journal Article
Maciejewski, G., Dimitrov, D., Seeliger, M., Raetz, S., Bukowiecki, Ł., Kitze, M., …Chen, W. P. (2013). Multi-site campaign for transit timing variations of WASP-12 b: possible detection of a long-period signal of planetary origin. Astronomy & Astrophysics, 551, Article A108. https://doi.org/10.1051/0004-6361/201220739

Aims. The transiting planet WASP-12 b was identified as a potential target for transit-timing studies because a departure from a linear ephemeris has been reported in the literature. Such deviations could be caused by an additional planet in the syst... Read More about Multi-site campaign for transit timing variations of WASP-12 b: possible detection of a long-period signal of planetary origin.

Flux and color variations of the doubly imaged quasar UM673 (2013)
Journal Article
Ricci, D., Elyiv, A., Finet, F., Wertz, O., Alsubai, K., Anguita, T., …Surdej, J. (2013). Flux and color variations of the doubly imaged quasar UM673. Astronomy & Astrophysics, 551, Article A104. https://doi.org/10.1051/0004-6361/201118755

Aims. With the aim of characterizing the flux and color variations of the multiple components of the gravitationally lensed quasar UM673 as a function of time, we have performed multiepoch and multiband photometric observations with the Danish telesc... Read More about Flux and color variations of the doubly imaged quasar UM673.

Physical properties of the WASP-44 planetary system from simultaneous multi-colour photometry (2013)
Journal Article
Mancini, L., Nikolov, N., Southworth, J., Chen, G., Fortney, J. J., Tregloan-Reed, J., …Henning, T. (2013). Physical properties of the WASP-44 planetary system from simultaneous multi-colour photometry. Monthly Notices of the Royal Astronomical Society, 430(4), 2932-2942. https://doi.org/10.1093/mnras/stt095

We present ground-based broad-band photometry of two transits in the WASP-44 planetary system obtained simultaneously through four optical (Sloan g′, r′, i′, z′) and three near-infrared (NIR; J, H, K) filters. We achieved low scatters of 1–2 mmag per... Read More about Physical properties of the WASP-44 planetary system from simultaneous multi-colour photometry.

A lower radius and mass for the transiting extrasolar planet HAT-P-8 b (2013)
Journal Article
Mancini, L., Southworth, J., Ciceri, S., Fortney, J. J., Morley, C. V., Dittmann, J. A., …Henning, T. (2013). A lower radius and mass for the transiting extrasolar planet HAT-P-8 b. Astronomy & Astrophysics, 551, Article A11. https://doi.org/10.1051/0004-6361/201220291

Context. The extrasolar planet HAT-P-8 b was thought to be one of the more inflated transiting hot Jupiters. Aims. By using new and existing photometric data, we computed precise estimates of the physical properties of the system. Methods. We p... Read More about A lower radius and mass for the transiting extrasolar planet HAT-P-8 b.

MOA-2010-BLG-523: “FAILED PLANET” = RS CVn STAR (2013)
Journal Article
Gould, A., Yee, J. C., Bond, I. A., Udalski, A., Han, C., Jørgensen, U. G., …The PLANET Collaboration. (in press). MOA-2010-BLG-523: “FAILED PLANET” = RS CVn STAR. Astrophysical Journal, 763(2), Article 141. https://doi.org/10.1088/0004-637x/763/2/141

The Galactic bulge source MOA-2010-BLG-523S exhibited short-term deviations from a standard microlensing light curve near the peak of an Amax ∼ 265 high-magnification microlensing event. The deviations originally seemed consistent with expectations f... Read More about MOA-2010-BLG-523: “FAILED PLANET” = RS CVn STAR.

WASP-52b, WASP-58b, WASP-59b, and WASP-60b: Four new transiting close-in giant planets (2013)
Journal Article
Hébrard, G., Collier Cameron, A., Brown, D. J. A., Díaz, R. F., Faedi, F., Smalley, B., …Wheatley, P. J. (2013). WASP-52b, WASP-58b, WASP-59b, and WASP-60b: Four new transiting close-in giant planets. Astronomy & Astrophysics, 549, Article A134. https://doi.org/10.1051/0004-6361/201220363

We present the discovery of four new transiting hot Jupiters, detected mainly from SuperWASP-North and SOPHIE observations. These new planets, WASP-52b, WASP-58b, WASP-59b, and WASP-60b, have orbital periods ranging from 1.7 to 7.9 days, masses betwe... Read More about WASP-52b, WASP-58b, WASP-59b, and WASP-60b: Four new transiting close-in giant planets.

MOA-2010-BLG-073L: AN M-DWARF WITH A SUBSTELLAR COMPANION AT THE PLANET/BROWN DWARF BOUNDARY (2013)
Journal Article
Street, R. A., Choi, J., Tsapras, Y., Han, C., Furusawa, K., Hundertmark, M., …MiNDSTEp. (2013). MOA-2010-BLG-073L: AN M-DWARF WITH A SUBSTELLAR COMPANION AT THE PLANET/BROWN DWARF BOUNDARY. Astrophysical Journal, 763(1), Article 67. https://doi.org/10.1088/0004-637x/763/1/67

We present an analysis of the anomalous microlensing event, MOA-2010-BLG-073, announced by the Microlensing Observations in Astrophysics survey on 2010 March 18. This event was remarkable because the source was previously known to be photometrically... Read More about MOA-2010-BLG-073L: AN M-DWARF WITH A SUBSTELLAR COMPANION AT THE PLANET/BROWN DWARF BOUNDARY.

The transiting system GJ1214: high-precision defocused transit observations and a search for evidence of transit timing variation (2012)
Journal Article
Harpsøe, K. B. W., Hardis, S., Hinse, T. C., Jørgensen, U. G., Mancini, L., Southworth, J., …Wertz, O. (2013). The transiting system GJ1214: high-precision defocused transit observations and a search for evidence of transit timing variation. Astronomy & Astrophysics, 549, Article A10. https://doi.org/10.1051/0004-6361/201219996

Aims. We present 11 high-precision photometric transitobservations of the transiting super-Earth planet GJ 1214 b. Combining these data with observations from other authors, we investigate the ephemeris for possible signs of transit timing variations... Read More about The transiting system GJ1214: high-precision defocused transit observations and a search for evidence of transit timing variation.

Transits and starspots in the WASP-19 planetary system (2012)
Journal Article
Tregloan-Reed, J., Southworth, J., & Tappert, C. (2013). Transits and starspots in the WASP-19 planetary system. Monthly Notices of the Royal Astronomical Society, 428(4), 3671-3679. https://doi.org/10.1093/mnras/sts306

We have developed a new model for analysing light curves of planetary transits when there are starspots on the stellar disc. Because the parameter space contains a profusion of local minima we developed a new optimization algorithm which combines the... Read More about Transits and starspots in the WASP-19 planetary system.

Spitzer 3.6 and 4.5 mu m full-orbit light curves of WASP-18 (2012)
Journal Article
Maxted, P., Anderson, D. R., Doyle, A. P., Gillon, M., Harrington, J., Iro, N., …Southworth, J. (2013). Spitzer 3.6 and 4.5 mu m full-orbit light curves of WASP-18. Monthly Notices of the Royal Astronomical Society, 428(3), 2645-2660. https://doi.org/10.1093/mnras/sts231

We present new lightcurves of the massive hot Jupiter system WASP-18 obtained with the Spitzer spacecraft covering the entire orbit at 3.6 micron and 4.5 micron. These lightcurves are used to measure the amplitude, shape and phase of the thermal phas... Read More about Spitzer 3.6 and 4.5 mu m full-orbit light curves of WASP-18.

WASP-78b and WASP-79b: Two highly-bloated hot Jupiter-mass exoplanets orbiting F-type stars in Eridanus (2012)
Journal Article
Smalley, B., R. Anderson, D., Collier-Cameron, A., P. Doyle, A., Fumel, A., Gillon, M., …G. West, R. (2012). WASP-78b and WASP-79b: Two highly-bloated hot Jupiter-mass exoplanets orbiting F-type stars in Eridanus. Astronomy and Astrophysics, 547, Article A61. https://doi.org/10.1051/0004-6361/201219731

We report the discovery of WASP-78b and WASP-79b, two highly-bloated Jupiter-mass exoplanets orbiting F-type host stars. WASP-78b orbits its V=12.0 host star (TYC 5889-271-1) every 2.175 days and WASP-79b orbits its V=10.1 host star (CD-30 1812) ever... Read More about WASP-78b and WASP-79b: Two highly-bloated hot Jupiter-mass exoplanets orbiting F-type stars in Eridanus.

HSTEP -- Homogeneous Studies of Transiting Extrasolar Planets (2012)
Conference Proceeding
Southworth, J. (2012). HSTEP -- Homogeneous Studies of Transiting Extrasolar Planets. . https://doi.org/10.1017/S174392131301332X

I give a summary of the HSTEP project: an effort to calculate the physical properties of the known transiting extrasolar planets using a homogeneous approach. I discuss the motivation for the project, list the 83 planets which have already been studi... Read More about HSTEP -- Homogeneous Studies of Transiting Extrasolar Planets.

Eclipsing Binary Stars: the Royal Road to Stellar Astrophysics (2012)
Conference Proceeding
Taylor. (2012). Eclipsing Binary Stars: the Royal Road to Stellar Astrophysics. In Proceedings of the workshop "Orbital Couples: Pas de Deux in the Solar System and the Milky Way" (51-58)

Russell (1948) famously described eclipses as the "royal road" to stellar astrophysics. From photometric and spectroscopic observations it is possible to measure the masses and radii (to 1% or better!), and thus surface gravities and mean densities,... Read More about Eclipsing Binary Stars: the Royal Road to Stellar Astrophysics.

SuperWASP observations of pulsating Am stars (2011)
Journal Article
Smalley, B., Kurtz, D., Smith, A. S., Fossati, L., Anderson, D., Barros, S. C., …Wood, P. L. (2011). SuperWASP observations of pulsating Am stars. Astronomy & Astrophysics, 535, Article A3. https://doi.org/10.1051/0004-6361/201117230

We have studied over 1600 Am stars at a photometric precision of 1 mmag with SuperWASP photometric data. Contrary to previous belief, we find that around 200 Am stars are pulsating delta Sct and gamma Dor stars, with low amplitudes that have been mis... Read More about SuperWASP observations of pulsating Am stars.

WASP-34b: a near-grazing transiting sub-Jupiter-mass exoplanet in a hierarchical triple system (2011)
Journal Article
Smalley, B., R. Anderson, D., Collier Cameron, A., Hellier, C., Lendl, M., F. L. Maxted, P., …Bento, J. (2011). WASP-34b: a near-grazing transiting sub-Jupiter-mass exoplanet in a hierarchical triple system. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/201015992

We report the discovery of WASP-34b, a sub-Jupiter-mass exoplanet transiting its 10.4-magnitude solar-type host star (1SWASP J110135.89-235138.4; TYC 6636-540-1) every 4.3177 days in a slightly eccentric orbit (e = 0.038 +/- 0.012). We find a planeta... Read More about WASP-34b: a near-grazing transiting sub-Jupiter-mass exoplanet in a hierarchical triple system.

WASP-26b: A 1-Jupiter-mass planet around an early-G-type star (2010)
Journal Article
Smalley, B., R. Anderson, D., Collier Cameron, A., Gillon, M., Hellier, C., A. Lister, T., …Bento, J. (2010). WASP-26b: A 1-Jupiter-mass planet around an early-G-type star. Astronomy & Astrophysics, 520, Article A56. https://doi.org/10.1051/0004-6361/201014705

We report the discovery of WASP-26b, a moderately over-sized Jupiter-mass exoplanet transiting its 11.3-magnitude early-G-type host star (1SWASP J001824.70-151602.3; TYC 5839-876-1) every 2.7566 days. A simultaneous fit to transit photometry and radi... Read More about WASP-26b: A 1-Jupiter-mass planet around an early-G-type star.

The ultra-compact binary candidate KUV 23182+1007 is a bright quasar (2007)
Journal Article
Southworth, J., Schwope, A., Gaensicke, B., & Schreiber, M. (2007). The ultra-compact binary candidate KUV 23182+1007 is a bright quasar. arXiv,

KUV 23182+1007 was identified as a blue object in the Kiso UV Survey in the 1980s. Classification-dispersion spectroscopy showed a featureless continuum except for a strong emission line in the region of He II 4686 A. This is a hallmark of the rare A... Read More about The ultra-compact binary candidate KUV 23182+1007 is a bright quasar.