All Outputs (21)

TIC 168789840: A Sextuply Eclipsing Sextuple Star System (2021)
Journal Article
Hellier. (2021). TIC 168789840: A Sextuply Eclipsing Sextuple Star System. Astronomical Journal, 162 - 162. https://doi.org/10.3847/1538-3881/abddb5

We report the discovery of a sextuply eclipsing sextuple star system from TESS data, TIC 168789840, also known as TYC 7037-89-1, the first known sextuple system consisting of three eclipsing binaries. The target was observed in Sectors 4 and 5 during... Read More about TIC 168789840: A Sextuply Eclipsing Sextuple Star System.

Discovery of Three New Transiting Hot Jupiters: WASP-161 b, WASP-163 b, and WASP-170 b (2019)
Journal Article
Maxted, Smalley, & Hellier. (2019). Discovery of Three New Transiting Hot Jupiters: WASP-161 b, WASP-163 b, and WASP-170 b. Astronomical Journal, 43. https://doi.org/10.3847/1538-3881/aaf422

We present the discovery of three new transiting hot Jupiters by the WASP-South project, WASP-161 b, WASP-163 b, and WASP-170 b. Follow-up radial velocities obtained with the Euler/CORALIE spectrograph and transit light curves obtained with the TRAPP... Read More about Discovery of Three New Transiting Hot Jupiters: WASP-161 b, WASP-163 b, and WASP-170 b.

A Discrete Set of Possible Transit Ephemerides for Two Long-period Gas Giants Orbiting HIP 41378 (2019)
Journal Article
Hellier. (2019). A Discrete Set of Possible Transit Ephemerides for Two Long-period Gas Giants Orbiting HIP 41378. Astronomical Journal, https://doi.org/10.3847/1538-3881/aaf0a2

In 2015, K2 observations of the bright (V = 8.9, K = 7.7) star HIP 41378 revealed a rich system of at least five transiting exoplanets, ranging in size from super-Earths to gas giants. The 2015 K2 observations only spanned 74.8 days, and the outer th... Read More about A Discrete Set of Possible Transit Ephemerides for Two Long-period Gas Giants Orbiting HIP 41378.

Rossiter-McLaughlin models and their effect on estimates of stellar rotation, illustrated using six WASP systems (2017)
Journal Article
Maxted, Smalley, & Hellier. (2017). Rossiter-McLaughlin models and their effect on estimates of stellar rotation, illustrated using six WASP systems. Monthly Notices of the Royal Astronomical Society, 810 - 839. https://doi.org/10.1093/mnras/stw2316

We present new measurements of the projected spin-orbit angle ? for six WASP hot Jupiters, four of which are new to the literature (WASP-61, -62, -76, and -78), and two of which are new analyses of previously measured systems using new data (WASP-71,... Read More about Rossiter-McLaughlin models and their effect on estimates of stellar rotation, illustrated using six WASP systems.

Pulsation versus metallicism in Am stars as revealed by LAMOST and WASP (2016)
Journal Article
Smalley, B., Antoci, V., L. Holdsworth, D., W. Kurtz, D., J. Murphy, S., De Cat, P., …J. Wheatley, P. (2017). Pulsation versus metallicism in Am stars as revealed by LAMOST and WASP. Monthly Notices of the Royal Astronomical Society, 465(3), 2662-2670. https://doi.org/10.1093/mnras/stw2903

We present the results of a study of a large sample of A and Am stars with spectral types from LAMOST and light curves from WASP. We find that, unlike normal A stars, d Sct pulsations in Am stars are mostly confined to the effective temperature range... Read More about Pulsation versus metallicism in Am stars as revealed by LAMOST and WASP.

Discovery of WASP-113b and WASP-114b, two inflated hot-Jupiters with contrasting densities (2016)
Journal Article
Hellier, & Smalley. (2016). Discovery of WASP-113b and WASP-114b, two inflated hot-Jupiters with contrasting densities. Astronomy and Astrophysics, https://doi.org/10.1051/0004-6361/201526517

Aims. We present the discovery and characterisation of the exoplanets WASP-113b and WASP-114b by the WASP surveys, SOPHIE and CORALIE. Methods. The planetary nature of the systems was established by performing follow-up photometric and spectroscop... Read More about Discovery of WASP-113b and WASP-114b, two inflated hot-Jupiters with contrasting densities.

Orbital and physical parameters of eclipsing binaries from the ASAS catalogue - IX. Spotted pairs with red giants (2016)
Journal Article
Hellier. (2016). Orbital and physical parameters of eclipsing binaries from the ASAS catalogue - IX. Spotted pairs with red giants. Monthly Notices of the Royal Astronomical Society, 2234 - 2249. https://doi.org/10.1093/mnras/stw1448

We present spectroscopic and photometric solutions for three spotted systems with red giant components. Absolute physical and orbital parameters for these double-lined detached eclipsing binary stars are presented for the first time. These were deriv... Read More about Orbital and physical parameters of eclipsing binaries from the ASAS catalogue - IX. Spotted pairs with red giants.

WASP-121 b: a hot Jupiter close to tidal disruption transiting an active F star (2016)
Journal Article
Hellier, Smalley, & Maxted. (2016). WASP-121 b: a hot Jupiter close to tidal disruption transiting an active F star. Monthly Notices of the Royal Astronomical Society, 4025 - 4043. https://doi.org/10.1093/mnras/stw522

We present the discovery by the WASP-South survey of WASP-121 b, a new remarkable short-period transiting hot Jupiter. The planet has a mass of 1.183+0.064-0.062MJup, a radius of 1.865 ± 0.044 RJup, and transits every 1.2749255+0.0000020-0.0000025 da... Read More about WASP-121 b: a hot Jupiter close to tidal disruption transiting an active F star.

STARSPOTS ON WASP-85 (2016)
Journal Article
Hellier. (2016). STARSPOTS ON WASP-85. Astronomical Journal, https://doi.org/10.3847/0004-6256/151/6/150

By analyzing K2 short-cadence observations, we detect starspots on WASP-85A, the host star of the hot Jupiter WASP-85Ab. The detection of recurring starspot occultation events indicates that the planet's orbit is aligned with the star's rotational ax... Read More about STARSPOTS ON WASP-85.

FORS2 observes a multi-epoch transmission spectrum of the hot Saturn-mass exoplanet WASP-49b (2016)
Journal Article
Hellier. (2016). FORS2 observes a multi-epoch transmission spectrum of the hot Saturn-mass exoplanet WASP-49b. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/201527594

Context. Transmission spectroscopy has proven to be a useful tool for the study of exoplanet atmospheres, because the absorption and scattering signatures of the atmosphere manifest themselves as variations in the planetary transit depth. Several pla... Read More about FORS2 observes a multi-epoch transmission spectrum of the hot Saturn-mass exoplanet WASP-49b.

Hot Jupiters with relatives: discovery of additional planets in orbit around WASP-41 and WASP-47 (2016)
Journal Article
Hellier. (2016). Hot Jupiters with relatives: discovery of additional planets in orbit around WASP-41 and WASP-47. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/201526965

We report the discovery of two additional planetary companions to WASP-41 and WASP-47. WASP-41 c is a planet of minimum mass 3.18 ± 0.20 MJup and eccentricity 0.29 ± 0.02, and it orbits in 421 ± 2 days. WASP-47 c is a planet of minimum mass 1.24 ± 0.... Read More about Hot Jupiters with relatives: discovery of additional planets in orbit around WASP-41 and WASP-47.

WASP-80b has a dayside within the T-dwarf range (2015)
Journal Article
Maxted, Smalley, & Hellier. (2015). WASP-80b has a dayside within the T-dwarf range. Monthly Notices of the Royal Astronomical Society, 2279 -2290. https://doi.org/10.1093/mnras/stv706

WASP-80b is a missing link in the study of exoatmospheres. It falls between the warm Neptunes and the hot Jupiters and is amenable for characterization, thanks to its host star's properties. We observed the planet through transit and during occultati... Read More about WASP-80b has a dayside within the T-dwarf range.

WASP-20b and WASP-28b: a hot Saturn and a hot Jupiter in near-aligned orbits around solar-type stars (2015)
Journal Article
Hellier, Smalley, & Maxted. (2015). WASP-20b and WASP-28b: a hot Saturn and a hot Jupiter in near-aligned orbits around solar-type stars. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/201423591

We report the discovery of the planets WASP-20b and WASP-28b along with measurements of their sky-projected orbital obliquities. WASP-20b is an inflated, Saturn-mass planet (0.31?MJup; 1.46?RJup) in a 4.9-day, near-aligned (? = 12.7 ± 4.2°) orbit aro... Read More about WASP-20b and WASP-28b: a hot Saturn and a hot Jupiter in near-aligned orbits around solar-type stars.

The well-aligned orbit of Wasp-84b: evidence for disk migration of a hot Jupiter (2015)
Journal Article
Smalley, Hellier, & Maxted. (2015). The well-aligned orbit of Wasp-84b: evidence for disk migration of a hot Jupiter. Astrophysical Journal Letters, https://doi.org/10.1088/2041-8205/800/1/L9

We report the sky-projected orbital obliquity (spin–orbit angle) of WASP-84 b, a 0.69${{M}_{{\rm Jup}}}$ planet in an 8.52 day orbit around a G9V/K0V star, to be ? = -0.3 ± 1.7°. We obtain a true obliquity of ? = 17.3 ± 7.7° from a measurement of the... Read More about The well-aligned orbit of Wasp-84b: evidence for disk migration of a hot Jupiter.

Characterizing K2 Planet Discoveries: A Super-earth Transiting The Bright K Dwarf HIP 116454 (2015)
Journal Article
Hellier. (2015). Characterizing K2 Planet Discoveries: A Super-earth Transiting The Bright K Dwarf HIP 116454. Astrophysical Journal, https://doi.org/10.1088/0004-637X/800/1/59

We report the first planet discovery from the two-wheeled Kepler (K2) mission: HIP 116454 b. The host star HIP 116454 is a bright (V = 10.1, K = 8.0) K1 dwarf with high proper motion and a parallax-based distance of 55.2 ± 5.4 pc. Based on high-resol... Read More about Characterizing K2 Planet Discoveries: A Super-earth Transiting The Bright K Dwarf HIP 116454.

WASP-117b: a 10-day-period Saturn in an eccentric and misaligned orbit (2014)
Journal Article
Hellier, Smalley, & Maxted. (2014). WASP-117b: a 10-day-period Saturn in an eccentric and misaligned orbit. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/201424481

We report the discovery of WASP-117b, the first planet with a period beyond 10 days found by the WASP survey. The planet has a mass of Mp = 0.2755 ± 0.0089 MJ, a radius of and is in an eccentric (e = 0.302 ± 0.023), 10.02165 ± 0.00055 d orbit around... Read More about WASP-117b: a 10-day-period Saturn in an eccentric and misaligned orbit.

Period and amplitude variations in post-common-envelope eclipsing binaries observed with SuperWASP (2014)
Journal Article
Smalley, Hellier, C., & Maxted, P. (2014). Period and amplitude variations in post-common-envelope eclipsing binaries observed with SuperWASP. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/201424027

Period or amplitude variations in eclipsing binaries may reveal the presence of additional massive bodies in the system, such as circumbinary planets. Here, we have studied twelve previously-known eclipsing post-common-envelope binaries for evidence... Read More about Period and amplitude variations in post-common-envelope eclipsing binaries observed with SuperWASP.

A window on exoplanet dynamical histories: Rossiter-McLaughlin observations of WASP-13b and WASP-32b (2014)
Journal Article
Smalley, Maxted, & Hellier. (2014). A window on exoplanet dynamical histories: Rossiter-McLaughlin observations of WASP-13b and WASP-32b. Monthly Notices of the Royal Astronomical Society, 3392 -3401. https://doi.org/10.1093/mnras/stu520

We present Rossiter–McLaughlin observations of WASP-13b and WASP-32b and determine the sky-projected angle between the normal of the planetary orbit and the stellar rotation axis (?). WASP-13b and WASP-32b both have prograde orbits and are consistent... Read More about A window on exoplanet dynamical histories: Rossiter-McLaughlin observations of WASP-13b and WASP-32b.

SPITZER OBSERVATIONS OF THE THERMAL EMISSION FROM WASP-43b (2014)
Journal Article
Hellier. (2014). SPITZER OBSERVATIONS OF THE THERMAL EMISSION FROM WASP-43b. Astrophysical Journal, https://doi.org/10.1088/0004-637X/781/2/116

WASP-43b is one of the closest-orbiting hot Jupiters, with a semimajor axis of a = 0.01526 ± 0.00018 AU and a period of only 0.81 days. However, it orbits one of the coolest stars with a hot Jupiter (T * = 4520 ± 120 K), giving the planet a modest eq... Read More about SPITZER OBSERVATIONS OF THE THERMAL EMISSION FROM WASP-43b.

The Magnetospheric Boundary in Cataclysmic Variables (2014)
Journal Article
Hellier, C. (2014). The Magnetospheric Boundary in Cataclysmic Variables. EPJ Web of Conferences, 64, https://doi.org/10.1051/epjconf/20136407001

The magnetic cataclysmic variables (MCVs) present a wealth of observational diagnostics for studying accretion flows interacting with a magnetosphere. Spin-period pulsations from the rotation of the white dwarf are seen in optical light, in the UV an... Read More about The Magnetospheric Boundary in Cataclysmic Variables.