Transits and starspots in the WASP-6 planetary system (2015)
Journal Article
Tregloan-Reed, J., Southworth, J., Burgdorf, M., Calchi Novati, S., Dominik, M., Finet, F., Jørgensen, U., Maier, G., Mancini, L., Prof, S., Ricci, D., Snodgrass, C., Bozza, V., Browne, P., Dodds, P., Gerner, T., Harpsøe, K., Hinse, T., Hundertmark, M., Kains, N., …Surdej, J. (2015). Transits and starspots in the WASP-6 planetary system. Monthly Notices of the Royal Astronomical Society, 450(2), 1760 -1769. https://doi.org/10.1093/mnras/stv730

We present updates to PRISM, a photometric transit-starspot model, and GEMC, a hybrid optimization code combining MCMC and a genetic algorithm. We then present high-precision photometry of four transits in the WASP-6 planetary system, two of which co... Read More about Transits and starspots in the WASP-6 planetary system.

WASP-94 A and B planets: hot-Jupiter cousins in a twin-star system (2014)
Journal Article
Neveu-VanMalle, M., Queloz, D., Anderson, D., Charbonnel, C., Collier Cameron, A., Delrez, L., Gillon, M., Hellier, C., Jehin, E., Lendl, M., Maxted, P., Pepe, F., Pollacco, D., Ségransan, D., Smalley, B., Smith, A., Southworth, J., Triaud, A., Udry, S., & West, R. (2014). WASP-94 A and B planets: hot-Jupiter cousins in a twin-star system. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/201424744

We report the discovery of two hot-Jupiter planets, each orbiting one of the stars of a wide binary system. WASP-94A (2MASS 20550794–3408079) is an F8 type star hosting a transiting planet with a radius of 1.72 ± 0.06 RJup, a mass of 0.452 ± 0.034 MJ... Read More about WASP-94 A and B planets: hot-Jupiter cousins in a twin-star system.

Variable emission from a gaseous disc around a metal-polluted white dwarf (2014)
Journal Article
Wilson, D., Gänsicke, B., Koester, D., Raddi, R., Breedt, E., Southworth, J., & Parsons, S. (2014). Variable emission from a gaseous disc around a metal-polluted white dwarf. Monthly Notices of the Royal Astronomical Society, 445(2), 1878 -1884. https://doi.org/10.1093/mnras/stu1876

We present the discovery of strongly variable emission lines from a gaseous disc around the DA white dwarf SDSS J1617+1620, a star previously found to have an infrared excess indicative of a dusty debris disc formed by the tidal disruption of a rocky... Read More about Variable emission from a gaseous disc around a metal-polluted white dwarf.

KIC 10526294: a slowly rotating B star with rotationally split, quasi-equally spaced gravity modes (2014)
Journal Article
Pápics, P., Moravveji, E., Aerts, C., Tkachenko, A., Triana, S., Bloemen, S., & Southworth, J. (2014). KIC 10526294: a slowly rotating B star with rotationally split, quasi-equally spaced gravity modes. Astronomy & Astrophysics, 570, Article A8. https://doi.org/10.1051/0004-6361/201424094

Context. Massive stars are important for the chemical enrichment of the universe. Since internal mixing processes influence their lives, it is very important to place constraints on the corresponding physical parameters, such as core overshooting and... Read More about KIC 10526294: a slowly rotating B star with rotationally split, quasi-equally spaced gravity modes.

Observational Studies of Transiting Extrasolar Planets (2014)
Presentation / Conference Contribution
Southworth, J. Observational Studies of Transiting Extrasolar Planets. Presented at Living Together: Planets, Host Stars and Binaries

The study of transiting extrasolar planets is only 15 years old, but has matured into a rich area of research. I review the observational aspects of this work, concentrating on the discovery of transits, the characterization of planets from photometr... Read More about Observational Studies of Transiting Extrasolar Planets.

High-precision photometry by telescope defocussing - VI. WASP-24, WASP-25 and WASP-26 (2014)
Journal Article
Southworth, J., Hinse, T., Burgdorf, M., Calchi Novati, S., Dominik, M., Galianni, P., Gerner, T., Giannini, E., Gu, S.-H., Hundertmark, M., Jørgensen, U., Juncher, D., Kerins, E., Mancini, L., Rabus, M., Ricci, D., Schäfer, S., Skottfelt, J., Tregloan-Reed, J., Wang, X.-B., …Vilela, C. (2014). High-precision photometry by telescope defocussing - VI. WASP-24, WASP-25 and WASP-26. Monthly Notices of the Royal Astronomical Society, 444(1), 776 -789. https://doi.org/10.1093/mnras/stu1492

We present time series photometric observations of 13 transits in the planetary systems WASP-24, WASP-25 and WASP-26. All three systems have orbital obliquity measurements, WASP-24 and WASP-26 have been observed with Spitzer, and WASP-25 was previous... Read More about High-precision photometry by telescope defocussing - VI. WASP-24, WASP-25 and WASP-26.

HD 183648: a Kepler eclipsing binary with anomalous ellipsoidal variations and a pulsating component (2014)
Journal Article
Borkovits, T., Derekas, A., Fuller, J., Szabó, G., Pavlovski, K., Csák, B., Dózsa, Á., Kovács, J., Szabó, R., Hambleton, K., Kinemuchi, K., Kolbas, V., Kurtz, D., Maloney, F., Prša, A., Southworth, J., Sztakovics, J., Bíró, I., & Jankovics, I. (2014). HD 183648: a Kepler eclipsing binary with anomalous ellipsoidal variations and a pulsating component. Monthly Notices of the Royal Astronomical Society, 443(4), 3068 - 3081. https://doi.org/10.1093/mnras/stu1379

KIC 8560861 (HD 183648) is a marginally eccentric (e = 0.05) eclipsing binary with an orbital period of Porb = 31.973 d, exhibiting mmag amplitude pulsations on time-scales of a few days. We present the results of the complex analysis of high- and me... Read More about HD 183648: a Kepler eclipsing binary with anomalous ellipsoidal variations and a pulsating component.

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., Jehin, E., Lafreniere, D., Smalley, B., & 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.

Eclipsing Binary Stars: the Royal Road to Stellar Astrophysics (2012)
Presentation / Conference Contribution
Taylor. (2011, October). Eclipsing Binary Stars: the Royal Road to Stellar Astrophysics. Presented at Pas De Deux conference 2011, Observatoire de Paris, France

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.

Homogeneous studies of transiting planets (2011)
Presentation / Conference Contribution
Southworth, J. (2011, July). Homogeneous studies of transiting planets. Presented at IAUS 282: From Interacting Binaries to Exoplanets: Essential Modeling Tools, Tatranska Lomnica

The derived physical properties of the known transiting extrasolar planetary systems come from a variety of sources, and are calculated using a range of different methods so are not always directly comparable. I present a catalogue of the physical pr... Read More about Homogeneous studies of transiting planets.

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.

Eclipsing Binaries in Open Clusters (2006)
Journal Article
Southworth, J., & Viggo Clausen, J. (2006). Eclipsing Binaries in Open Clusters. Astrophysics and Space Science, 304, Article 199–202. https://doi.org/10.1007/s10509-006-9110-3

Detached eclipsing binaries are very useful objects for calibrating theoretical stellar models and checking their predictions. Detached eclipsing binaries in open clusters are particularly important because of the additional constraints on their age... Read More about Eclipsing Binaries in Open Clusters.