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Planetary system around the nearby M dwarf GJ 357 including a transiting, hot, Earth-sized planet optimal for atmospheric characterization (2019)
Journal Article
Luque, R., Pallé, E., Kossakowski, D., Dreizler, S., Kemmer, J., Espinoza, N., …Wohler, B. (2019). Planetary system around the nearby M dwarf GJ 357 including a transiting, hot, Earth-sized planet optimal for atmospheric characterization. Astronomy and Astrophysics, 628, Article A39. https://doi.org/10.1051/0004-6361/201935801

We report the detection of a transiting Earth-size planet around GJ 357, a nearby M2.5 V star, using data from the Transiting Exoplanet Survey Satellite (TESS). GJ 357 b (TOI-562.01) is a transiting, hot, Earth-sized planet (Teq = 525 ± 11 K) with a... Read More about Planetary system around the nearby M dwarf GJ 357 including a transiting, hot, Earth-sized planet optimal for atmospheric characterization.

TESS Hunt for Young and Maturing Exoplanets (THYME): A Planet in the 45 Myr Tucana–Horologium Association (2019)
Journal Article
Hellier. (2019). TESS Hunt for Young and Maturing Exoplanets (THYME): A Planet in the 45 Myr Tucana–Horologium Association. Astrophysical Journal Letters, L17 - L17. https://doi.org/10.3847/2041-8213/ab2988

Young exoplanets are snapshots of the planetary evolution process. Planets that orbit stars in young associations are particularly important because the age of the planetary system is well constrained. We present the discovery of a transiting planet... Read More about TESS Hunt for Young and Maturing Exoplanets (THYME): A Planet in the 45 Myr Tucana–Horologium Association.

The EBLM Project VI. The mass and radius of five low-mass stars in F+M binaries discovered by the WASP survey (2019)
Journal Article
Gill, S., Maxted, P., Evans, J., Evans, D., Smalley, B., Gary, B., …West, R. (2019). The EBLM Project VI. The mass and radius of five low-mass stars in F+M binaries discovered by the WASP survey. Astronomy & Astrophysics, 626, Article A119. https://doi.org/10.1051/0004-6361/201833054

Some M-dwarfs around F-/G-type stars have been measured to be hotter and larger than predicted by stellar evolution models. Inconsistencies between observations and models need addressing with more mass, radius and luminosity measurements of low-mass... Read More about The EBLM Project VI. The mass and radius of five low-mass stars in F+M binaries discovered by the WASP survey.

The EBLM Project V. Physical properties of ten fully convective, very-low-mass stars (2019)
Journal Article
Maxted, Smalley, & Hellier. (2019). The EBLM Project V. Physical properties of ten fully convective, very-low-mass stars. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/201834539

Measurements of the physical properties of stars at the lower end of the main sequence are scarce. In this context we report masses, radii and surface gravities of ten very-low-mass stars in eclipsing binary systems, with orbital periods of the order... Read More about The EBLM Project V. Physical properties of ten fully convective, very-low-mass stars.

Three Hot-Jupiters on the upper edge of the mass-radius distribution: WASP-177, WASP-181 and WASP-183 (2019)
Journal Article
Maxted, Smalley, & Hellier. (2019). Three Hot-Jupiters on the upper edge of the mass-radius distribution: WASP-177, WASP-181 and WASP-183. Monthly Notices of the Royal Astronomical Society, 5790-5799. https://doi.org/10.1093/mnras/stz742

We present the discovery of 3 transiting planets from the WASP survey, two hot-Jupiters: WASP-177 b (~0.5 MJup, ~1.6 RJup) in a 3.07-d orbit of a V = 12.6 K2 star, WASP-183 b (~0.5 MJup, ~1.5 RJup) in a 4.11-d orbit of a V = 12.8 G9/K0 star; and one... Read More about Three Hot-Jupiters on the upper edge of the mass-radius distribution: WASP-177, WASP-181 and WASP-183.

The BEBOP radial-velocity survey for circumbinary planets I. Eight years of CORALIE observations of 47 single-line eclipsing binaries and abundance constraints on the masses of circumbinary planets (2019)
Journal Article
Hellier, & Maxted. (2019). The BEBOP radial-velocity survey for circumbinary planets I. Eight years of CORALIE observations of 47 single-line eclipsing binaries and abundance constraints on the masses of circumbinary planets. Astronomy and Astrophysics, https://doi.org/10.1051/0004-6361/201833669

We introduce the BEBOP radial velocity survey for circumbinary planets. We initiated this survey using the CORALIE spectrograph on the Swiss Euler Telescope at La Silla, Chile. An intensive four-year observation campaign commenced in 2013, targeting... Read More about The BEBOP radial-velocity survey for circumbinary planets I. Eight years of CORALIE observations of 47 single-line eclipsing binaries and abundance constraints on the masses of circumbinary planets.

WASP-190b: Tomographic discovery of a transiting hot Jupiter (2019)
Journal Article
Y. Temple, L., Hellier, C., Almleaky, Y., Anderson, D., Bouchy, F., Brown, D., …West, R. (2019). WASP-190b: Tomographic discovery of a transiting hot Jupiter. Astronomy & Astrophysics, 157(4), Article 141. https://doi.org/10.3847/1538-3881/ab095a

We report the discovery of WASP-190b, an exoplanet on a 5.37 day orbit around a mildly evolved F6 IV-V star with V = 11.7,  = 6400 ± 100 K, M* = 1.35 ± 0.05 M?, and R* = 1.6 ± 0.1 R?. The planet has a radius of RP = 1.15 ± 0.09 RJup and a mass of MP ... Read More about WASP-190b: Tomographic discovery of a transiting hot Jupiter.

Fundamental properties of the pre-main sequence eclipsing stars of MML 53 and the mass of the tertiary (2019)
Journal Article
Hellier. (2019). Fundamental properties of the pre-main sequence eclipsing stars of MML 53 and the mass of the tertiary. Astronomy and Astrophysics, https://doi.org/10.1051/0004-6361/201833299

We present the most comprehensive analysis to date of the Upper Centaurus Lupus eclipsing binary MML 53 (with PEB = 2.097892 d), and for the first time, confirm the bound-nature of the third star (in a P3 ~ 9 yr orbit) by constraining its mass dynami... Read More about Fundamental properties of the pre-main sequence eclipsing stars of MML 53 and the mass of the tertiary.

Fundamental properties of the pre-main sequence eclipsing stars of MML 53 and the mass of the tertiary (2019)
Journal Article
Hellier. (2019). Fundamental properties of the pre-main sequence eclipsing stars of MML 53 and the mass of the tertiary. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/201733299

We present the most comprehensive analysis to date of the Upper Centaurus Lupus eclipsing binary MML 53 (with P-EB = 2.097892 d), and for the first time, confirm the bound-nature of the third star (in a P-3 similar to 9 yr orbit) by constraining its... Read More about Fundamental properties of the pre-main sequence eclipsing stars of MML 53 and the mass of the tertiary.

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.

New transiting hot Jupiters discovered by WASP-South, Euler/CORALIE and TRAPPIST-South (2019)
Journal Article
Smalley, Hellier, & Maxted. (2019). New transiting hot Jupiters discovered by WASP-South, Euler/CORALIE and TRAPPIST-South. Monthly Notices of the Royal Astronomical Society, 1379-1391. https://doi.org/10.1093/mnras/sty2741

We report the discovery of eight hot-Jupiter exoplanets from the WASP-South transit survey. WASP-144b has a mass of 0.44 Mj, a radius of 0.85 Rj, and is in a 2.27-d orbit around a V = 12.9, K2 star which shows a 21-d rotational modulation. WASP-145Ab... Read More about New transiting hot Jupiters discovered by WASP-South, Euler/CORALIE and TRAPPIST-South.

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.

Discovery of WASP-174b: Doppler tomography of a near-grazing transit (2018)
Journal Article
Maxted, Hellier, & Smalley. (2018). Discovery of WASP-174b: Doppler tomography of a near-grazing transit. Monthly Notices of the Royal Astronomical Society, 5307-5313. https://doi.org/10.1093/mnras/sty2197

We report the discovery and tomographic detection of WASP-174b, a planet with a near-grazing transit on a 4.23-d orbit around a V = 11.9, F6V star with [Fe/H] = 0.09 ± 0.09. The planet is in a moderately misaligned orbit with a sky-projected spin–orb... Read More about Discovery of WASP-174b: Doppler tomography of a near-grazing transit.

WASP-147b, 160Bb, 164b, and 165b: two hot Saturns and two Jupiters, including two planets with metal-rich hosts (2018)
Journal Article
Lendl, M., Anderson, D. R., Bonfanti, A., Bouchy, F., Burdanov, A., Collier Cameron, A., …West, R. G. (2019). WASP-147b, 160Bb, 164b, and 165b: two hot Saturns and two Jupiters, including two planets with metal-rich hosts. Monthly Notices of the Royal Astronomical Society, 482(1), 301 -312. https://doi.org/10.1093/mnras/sty2667

We report the discovery of four transiting hot Jupiters, WASP-147, WASP-160B, WASP-164, and WASP-165 from the WASP survey. WASP-147b is a near Saturn-mass (MP = 0.28MJ) object with a radius of 1.11RJ orbiting a G4 star with a period of 4.6 d. WASP-16... Read More about WASP-147b, 160Bb, 164b, and 165b: two hot Saturns and two Jupiters, including two planets with metal-rich hosts.

WASP-128b: a transiting brown dwarf in the dynamical-tide regime (2018)
Journal Article
Hodzic, V., Triaud, A. H. M. J., Anderson, D. R., Bouchy, F., Cameron, A. C., Delrez, L., …West, R. (2018). WASP-128b: a transiting brown dwarf in the dynamical-tide regime. Monthly Notices of the Royal Astronomical Society, 481(4), 5091-5097. https://doi.org/10.1093/mnras/sty2512

Massive companions in close orbits around G dwarfs are thought to undergo rapid orbital decay due to runaway tidal dissipation. We report here the discovery of WASP-128b, a brown dwarf discovered by the WASP survey transiting a G0V host on a 2.2 d or... Read More about WASP-128b: a transiting brown dwarf in the dynamical-tide regime.

WASP 0639-32: a new F-type subgiant/K-type main-sequence detached eclipsing binary from the WASP project (2018)
Journal Article
Hellier, & Maxted. (2018). WASP 0639-32: a new F-type subgiant/K-type main-sequence detached eclipsing binary from the WASP project. Astronomy & Astrophysics, A135 - A135. https://doi.org/10.1051/0004-6361/201731435

Aims. Our aim is to measure the masses and radii of the stars in a newly-discovered detached eclipsing binary system to a high precision (˜1%), enabling the system to be used for the calibration of free parameters in stellar evolutionary models. M... Read More about WASP 0639-32: a new F-type subgiant/K-type main-sequence detached eclipsing binary from the WASP project.

Thermal emission of WASP-48b in the K-s-band (2018)
Journal Article
Hellier. (2018). Thermal emission of WASP-48b in the K-s-band. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/201527071

We report a detection of thermal emission from the hot Jupiter WASP-48b in the Ks-band. We used the Wide-field Infra-red Camera on the 3.6-m Canada-France Hawaii Telescope to observe an occultation of the planet by its host star. From the resulting o... Read More about Thermal emission of WASP-48b in the K-s-band.

WASP-104b is darker than charcoal (2018)
Journal Article
Močnik, T., Hellier, C., & Southworth, J. (2018). WASP-104b is darker than charcoal. Astronomical Journal, 156(2), Article 44. https://doi.org/10.3847/1538-3881/aacb26

By analyzing the K2 short-cadence data from Campaign 14, we detect phase-curve modulation in the light curve of the hot-Jupiter host star WASP-104. The ellipsoidal modulation is detected with high significance and in agreement with theoretical expect... Read More about WASP-104b is darker than charcoal.

An absolute sodium abundance for a cloud-free 'hot Saturn' exoplanet. (2018)
Journal Article
Hellier, & Smalley. (2018). An absolute sodium abundance for a cloud-free 'hot Saturn' exoplanet. Nature, 526 - 529. https://doi.org/10.1038/s41586-018-0101-7

Broad absorption signatures from alkali metals, such as the sodium (Na I) and potassium (K I) resonance doublets, have long been predicted in the optical atmospheric spectra of cloud-free irradiated gas giant exoplanets1-3. However, observations have... Read More about An absolute sodium abundance for a cloud-free 'hot Saturn' exoplanet..