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TOI-1338: TESS' First Transiting Circumbinary Planet (2020)
Journal Article
Maxted. (2020). TOI-1338: TESS' First Transiting Circumbinary Planet. Astronomical Journal, https://doi.org/10.3847/1538-3881/ab8a48

We report the detection of the first circumbinary planet (CBP) found by Transiting Exoplanet Survey Satellite (TESS). The target, a known eclipsing binary, was observed in sectors 1 through 12 at 30 minute cadence and in sectors 4 through 12 at 2 min... Read More about TOI-1338: TESS' First Transiting Circumbinary Planet.

A multiplicity study of transiting exoplanet host stars I. High-contrast imaging with VLT/SPHERE (2020)
Journal Article
Bohn, A., Southworth, J., Ginski, C., Kenworthy, M., Maxted, P., & Evans, D. (2020). A multiplicity study of transiting exoplanet host stars I. High-contrast imaging with VLT/SPHERE. Astronomy & Astrophysics, 635, Article A73. https://doi.org/10.1051/0004-6361/201937127

Context. Many main-sequence stars are part of multiple systems. The effect of stellar multiplicity on planet formation and migration, however, is poorly understood.

Aims. We study the multiplicity of stars hosting known transiting extra-solar plan... Read More about A multiplicity study of transiting exoplanet host stars I. High-contrast imaging with VLT/SPHERE.

TICs 167692429 and 220397947: the first compact hierarchical triple stars discovered with TESS (2020)
Journal Article
Maxted. (2020). TICs 167692429 and 220397947: the first compact hierarchical triple stars discovered with TESS. Monthly Notices of the Royal Astronomical Society, 5005 - 5023. https://doi.org/10.1093/mnras/staa495

We report the discovery and complex analyses of the first two compact hierarchical triple star systems discovered with TESS in or near its southern continuous viewing zone during Year 1. Both TICs 167692429 and 220397947 were previously unknown eclip... Read More about TICs 167692429 and 220397947: the first compact hierarchical triple stars discovered with TESS.

The Pre-He White Dwarf in the Post-mass Transfer Binary EL CVn (2020)
Journal Article
Maxted. (2020). The Pre-He White Dwarf in the Post-mass Transfer Binary EL CVn. Astronomical Journal, 1-11. https://doi.org/10.3847/1538-3881/ab52fa

EL CVn is the prototype of a class of eclipsing binaries that consist of an A- or F-type main-sequence star and a hot, low-mass, pre-He white dwarf (pre-He WD), the stripped down remains of the former mass donor. Here we present the first direct dete... Read More about The Pre-He White Dwarf in the Post-mass Transfer Binary EL CVn.

WASP-South hot Jupiters: WASP-178b, WASP-184b, WASP-185b & WASP-192b (2019)
Journal Article
Smalley, Hellier, & Maxted. (2019). WASP-South hot Jupiters: WASP-178b, WASP-184b, WASP-185b & WASP-192b. Monthly Notices of the Royal Astronomical Society, 1479-1487. https://doi.org/10.1093/mnras/stz2713

We report on four new transiting hot Jupiters discovered by the WASP-South survey. WASP-178b transits a V = 9.9, A1V star with Teff = 9350 ± 150 K, the second-hottest transit host known. It has a highly bloated radius of 1.81 ± 0.09 RJup, in line wit... Read More about WASP-South hot Jupiters: WASP-178b, WASP-184b, WASP-185b & WASP-192b.

WASP-169, WASP-171, WASP-175, and WASP-182: three hot Jupiters and one bloated sub-Saturn mass planet discovered by WASP-South (2019)
Journal Article
Hellier, Smalley, & Maxted. (2019). WASP-169, WASP-171, WASP-175, and WASP-182: three hot Jupiters and one bloated sub-Saturn mass planet discovered by WASP-South. Monthly Notices of the Royal Astronomical Society, 2478 -2487. https://doi.org/10.1093/mnras/stz2351

We present the discovery of four new giant planets from the Wide Angle Search for Planets-South (WASP-South), three hot Jupiters and one bloated sub-Saturn mass planet: WASP-169b, WASP-171b, WASP-175b, and WASP-182b. Besides the discovery photometry... Read More about WASP-169, WASP-171, WASP-175, and WASP-182: three hot Jupiters and one bloated sub-Saturn mass planet discovered by WASP-South.

SuperWASP dispositions and false positive catalogue (2019)
Journal Article
Smalley, & Maxted. (2019). SuperWASP dispositions and false positive catalogue. Monthly Notices of the Royal Astronomical Society, 4905 - 4915. https://doi.org/10.1093/mnras/stz2064

SuperWASP, the Northern hemisphere WASP observatory, has been observing the skies from La Palma since 2004. In that time, more than 50 planets have been discovered with data contributions from SuperWASP. In the process of validating planets, many fal... Read More about SuperWASP dispositions and false positive catalogue.

WASP-180Ab: Doppler tomography of an hot Jupiter orbiting the primary star in a visual binary (2019)
Journal Article
Temple, L. Y., Hellier, C., Anderson, D. R., Barkaoui, K., Bouchy, F., Brown, D. J. A., …Zouhair, B. (2019). WASP-180Ab: Doppler tomography of an hot Jupiter orbiting the primary star in a visual binary. Monthly Notices of the Royal Astronomical Society, 490(2), 2467-2474. https://doi.org/10.1093/mnras/stz2632

We report the discovery and characterization of WASP-180Ab, a hot Jupiter confirmed by the detection of its Doppler shadow and by measuring its mass using radial velocities. We find the 0.9  ±  0.1 MJup, 1.24  ±  0.04 RJup planet to be in a misaligne... Read More about WASP-180Ab: Doppler tomography of an hot Jupiter orbiting the primary star in a visual binary.

WASP-166b: a bloated super-Neptune transiting a V = 9 star (2019)
Journal Article
Maxted, Hellier, & Smalley. (2019). WASP-166b: a bloated super-Neptune transiting a V = 9 star. Monthly Notices of the Royal Astronomical Society, 3067 -3075. https://doi.org/10.1093/mnras/stz1903

We report the discovery of WASP-166b, a super-Neptune planet with a mass of 0.1 MJup (1.9 MNep) and a bloated radius of 0.63 RJup. It transits a V = 9.36, F9V star in a 5.44-d orbit that is aligned with the stellar rotation axis (sky-projected obliqu... Read More about WASP-166b: a bloated super-Neptune transiting a V = 9 star.

Observing Exoplanets in the Near-Infrared from a High Altitude Balloon Platform (2019)
Journal Article
Nagler, P. C., Edwards, B., Kilpatrick, B., Lewis, N. K., Maxted, P., Netterfield, C. B., …Waldmann, I. (2019). Observing Exoplanets in the Near-Infrared from a High Altitude Balloon Platform. Journal of Astronomical Instrumentation, 8(3), https://doi.org/10.1142/S2251171719500119

Although there exists a large sample of known exoplanets, little data exists that can be used to study their global atmospheric properties. This deficiency can be addressed by performing phase-resolved spectroscopy — continuous spectroscopic observat... Read More about Observing Exoplanets in the Near-Infrared from a High Altitude Balloon Platform.

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.

Signs of accretion in the white dwarf + brown dwarf binary NLTT5306 (2019)
Journal Article
Maxted. (2019). Signs of accretion in the white dwarf + brown dwarf binary NLTT5306. Monthly Notices of the Royal Astronomical Society, 2566 - 2574. https://doi.org/10.1093/mnras/stz127

We present new XSHOOTER spectra of NLTT5306, a 0.44 ± 0.04 M? white dwarf in a short period (101 min) binary system with a brown dwarf companion that is likely to have previously undergone common envelope evolution. We have confirmed the presence of... Read More about Signs of accretion in the white dwarf + brown dwarf binary NLTT5306.

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.

Testing Systematics of Gaia DR2 Parallaxes with Empirical Surface Brightness: Color Relations Applied to Eclipsing Binaries (2019)
Journal Article
Maxted. (2019). Testing Systematics of Gaia DR2 Parallaxes with Empirical Surface Brightness: Color Relations Applied to Eclipsing Binaries. Astrophysical Journal, https://doi.org/10.3847/1538-4357/aafbed

Using a sample of 81 galactic, detached eclipsing binary stars we investigated the global zero-point shift of their parallaxes with the Gaia Data Release 2 (DR2) parallaxes. The stars in the sample lay in a distance range of 0.04–2 kpc from the Sun.... Read More about Testing Systematics of Gaia DR2 Parallaxes with Empirical Surface Brightness: Color Relations Applied to Eclipsing Binaries.

SB 796: a high-velocity RRc star (2019)
Journal Article
Maxted. (2019). SB 796: a high-velocity RRc star. Monthly Notices of the Royal Astronomical Society, 5327-5335. https://doi.org/10.1093/mnras/sty2828

We report here on a detailed study of a c-type RR Lyrae variable (RRc variable), SB 796, serendipitously discovered in a search of the WASP public data for stars that display large photometric periodic modulation. SB 796 displays a period of P = 0.26... Read More about SB 796: a high-velocity RRc star.

Detectability of shape deformation in short-period exoplanets (2019)
Journal Article
Maxted. (2019). Detectability of shape deformation in short-period exoplanets. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/201834215

Context
Short-period planets are influenced by the extreme tidal forces of their parent stars. These forces deform the planets causing them to attain nonspherical shapes. The nonspherical shapes, modeled here as triaxial ellipsoids, can have an impa... Read More about Detectability of shape deformation in short-period exoplanets.