The EBLM project – IX. Five fully convective M-dwarfs, precisely measured with CHEOPS and TESS light curves (2022)
Journal Article
Maxted. (2022). The EBLM project – IX. Five fully convective M-dwarfs, precisely measured with CHEOPS and TESS light curves. Monthly Notices of the Royal Astronomical Society, 519(3), 3546–3563. https://doi.org/10.1093/mnras/stac2565

Eclipsing binaries are important benchmark objects to test and calibrate stellar structure and evolution models. This is especially true for binaries with a fully convective M-dwarf component for which direct measurements of these stars' masses and r... Read More about The EBLM project – IX. Five fully convective M-dwarfs, precisely measured with CHEOPS and TESS light curves.

A stellar occultation by the transneptunian object (50000) Quaoar observed by CHEOPS (2022)
Journal Article
Maxted. (2022). A stellar occultation by the transneptunian object (50000) Quaoar observed by CHEOPS. Astronomy & Astrophysics, 1 - 9. https://doi.org/10.1051/0004-6361/202244221

Context. Stellar occultation is a powerful technique that allows the determination of some physical parameters of the occulting object. The result depends on the photometric accuracy, the temporal resolution, and the number of chords obtained. Space... Read More about A stellar occultation by the transneptunian object (50000) Quaoar observed by CHEOPS.

Uncovering the true periods of the young sub-Neptunes orbiting TOI-2076 (2022)
Journal Article
Maxted. (2022). Uncovering the true periods of the young sub-Neptunes orbiting TOI-2076. Astronomy & Astrophysics, A156 - A156. https://doi.org/10.1051/0004-6361/202243065

Context. TOI-2076 is a transiting three-planet system of sub-Neptunes orbiting a bright (G = 8.9 mag), young (340 ± 80 Myr) K-type star. Although a validated planetary system, the orbits of the two outer planets were unconstrained as only two non-con... Read More about Uncovering the true periods of the young sub-Neptunes orbiting TOI-2076.

Fundamental effective temperature measurements for eclipsing binary stars – III. SPIRou near-infrared spectroscopy and CHEOPS photometry of the benchmark G0V star EBLM J0113+31 (2022)
Journal Article
Maxted, P. F. L., Miller, N. J., Hoyer, S., Adibekyan, V., Sousa, S. G., Billot, N., Fortier, A., Simon, A. E., Collier Cameron, A., Swayne, M. I., Gutermann, P., Triaud, A. H. M. J., Southworth, J., Alibert, Y., Alonso, R., Anglada, G., Bárczy, T., Barrado Navascues, D., Barros, S. C. C., Baumjohann, W., …Walton, N. (2022). Fundamental effective temperature measurements for eclipsing binary stars – III. SPIRou near-infrared spectroscopy and CHEOPS photometry of the benchmark G0V star EBLM J0113+31. Monthly Notices of the Royal Astronomical Society, 513(4), 6042-6057. https://doi.org/10.1093/mnras/stac1270

EBLM J0113+31 is a moderately bright (V = 10.1), metal-poor ([Fe/H] approximate to-0.3) GOV star with a much fainter M dwarf companion on a wide, eccentric orbit (= 14.3 d). We have used near-infrared spectroscopy obtained with the SPIRou spectrograp... Read More about Fundamental effective temperature measurements for eclipsing binary stars – III. SPIRou near-infrared spectroscopy and CHEOPS photometry of the benchmark G0V star EBLM J0113+31.

Six new compact triply eclipsing triples found with TESS (2022)
Journal Article
Maxted, P. F. L., Rappaport, S. A., Borkovits, T., Gagliano, R., Jacobs, T. L., Kostov, V. B., Powell, B. P., Terentev, I., Omohundro, M., Torres, G., Vanderburg, A., Mitnyan, T., Kristiansen, M. H., LaCourse, D., Schwengeler, H. M., Kaye, T. G., Pál, A., Pribulla, T., Bíró, I. B., Csányi, I., …Stevens, D. J. (2022). Six new compact triply eclipsing triples found with TESS. Monthly Notices of the Royal Astronomical Society, 513(3), 4341-4360. https://doi.org/10.1093/mnras/stac957

In this work, we report the discovery and analysis of six new compact triply eclipsing triple star systems found with the TESS mission: TICs 37743815, 42565581, 54060695, 178010808, 242132789, and 456194776. All of these exhibit distinct third-body e... Read More about Six new compact triply eclipsing triples found with TESS.

Transit timing variations of AU Microscopii b and c* (2022)
Journal Article
Maxted. (2022). Transit timing variations of AU Microscopii b and c*. Astronomy & Astrophysics,

Here we report large-amplitude transit timing variations (TTVs) for AU Microcopii b and c as detected in combined TESS (2018, 2020) and CHEOPS (2020, 2021) transit observations. AU Mic is a young planetary system with a debris disk and two transiting... Read More about Transit timing variations of AU Microscopii b and c*.

The atmosphere and architecture of WASP-189 b probed by its CHEOPS phase curve (2022)
Journal Article
Maxted. (2022). The atmosphere and architecture of WASP-189 b probed by its CHEOPS phase curve. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/202142400

Context. Gas giants orbiting close to hot and massive early-type stars can reach dayside temperatures that are comparable to those of the coldest stars. These 'ultra-hot Jupiters' have atmospheres made of ions and atomic species from molecular dissoc... Read More about The atmosphere and architecture of WASP-189 b probed by its CHEOPS phase curve.

CHEOPS geometric albedo of the hot Jupiter HD 209458 b (2022)
Journal Article
Maxted. (2022). CHEOPS geometric albedo of the hot Jupiter HD 209458 b. Astronomy & Astrophysics, L4 - L4. https://doi.org/10.1051/0004-6361/202243082

We report the detection of the secondary eclipse of the hot Jupiter HD 209458 b in optical/visible light using the CHEOPS space telescope. Our measurement of 20.4(-3.3)(+3.2) parts per million translates into a geometric albedo of A(g) = 0.096 +/- 0.... Read More about CHEOPS geometric albedo of the hot Jupiter HD 209458 b.

Investigating the architecture and internal structure of the TOI-561 system planets with CHEOPS, HARPS-N, and TESS (2022)
Journal Article
Maxted. (2022). Investigating the architecture and internal structure of the TOI-561 system planets with CHEOPS, HARPS-N, and TESS. Monthly Notices of the Royal Astronomical Society, 4551 - 4571. https://doi.org/10.1093/mnras/stac199

We present a precise characterization of the TOI-561 planetary system obtained by combining previously published data with TESS and CHEOPS photometry, and a new set of 62 HARPS-N radial velocities (RVs). Our joint analysis confirms the presence of fo... Read More about Investigating the architecture and internal structure of the TOI-561 system planets with CHEOPS, HARPS-N, and TESS.

BEBOP III. Observations and an independent mass measurement of Kepler-16 (AB) b - the first circumbinary planet detected with radial velocities (2022)
Journal Article
Maxted, P. F. L., Triaud, A. H. M. J., Standing, M. R., Heidari, N., Martin, D. V., Boisse, I., Santerne, A., Correia, A. C. M., Acuña, L., Battley, M., Bonfils, X., Carmona, A., Collier Cameron, A., Cortés-Zuleta, P., Dransfield, G., Dalal, S., Deleuil, M., Delfosse, X., Faria, J., Forveille, T., …Willett, E. (2022). BEBOP III. Observations and an independent mass measurement of Kepler-16 (AB) b - the first circumbinary planet detected with radial velocities. Monthly Notices of the Royal Astronomical Society, 511(3), 3561-3570. https://doi.org/10.1093/mnras/stab3712

The radial velocity method is amongst the most robust and most established means of detecting exoplanets. Yet, it has so far failed to detect circumbinary planets despite their relatively high occurrence rates. Here, we report velocimetric measuremen... Read More about BEBOP III. Observations and an independent mass measurement of Kepler-16 (AB) b - the first circumbinary planet detected with radial velocities.

Spi-OPS: Spitzer and CHEOPS confirm the near-polar orbit of MASCARA-1 b and reveal a hint of dayside reflection (2022)
Journal Article
Maxted. (2022). Spi-OPS: Spitzer and CHEOPS confirm the near-polar orbit of MASCARA-1 b and reveal a hint of dayside reflection. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/202141645

<jats:p><jats:italic>Context.</jats:italic> The light curves of tidally locked hot Jupiters transiting fast-rotating, early-type stars are a rich source of information about both the planet and star, with full-phase coverage enabling a detailed atmos... Read More about Spi-OPS: Spitzer and CHEOPS confirm the near-polar orbit of MASCARA-1 b and reveal a hint of dayside reflection.

Detection of the tidal deformation of WASP-103b at 3 s with CHEOPS (Corrigendum) (2022)
Journal Article
Barros, S. C. C., Akinsanmi, B., Boué, G., Smith, A. M. S., Laskar, J., Ulmer-Moll, S., Lillo-Box, J., Queloz, D., Collier Cameron, A., Sousa, S. G., Ehrenreich, D., Hooton, M. J., Bruno, G., Demory, B. .-O., Correia, A. C. M., Demangeon, O. D. S., Wilson, T. G., Bonfanti, A., Hoyer, S., Alibert, Y., …Walton, N. A. (2022). Detection of the tidal deformation of WASP-103b at 3 s with CHEOPS (Corrigendum). Astronomy & Astrophysics, 658, Article C1. https://doi.org/10.1051/0004-6361/202142196e

The name of co-author Sébastien Salmon (Observatoire Astronomique de l’Université de Genève, Switzerland) was missing from the author list of the original published article. It is added among the authors in this Corrigendum.

BEBOP II: sensitivity to sub-Saturn circumbinary planets using radial-velocities (2022)
Journal Article
Maxted, & Hellier. (2022). BEBOP II: sensitivity to sub-Saturn circumbinary planets using radial-velocities. Monthly Notices of the Royal Astronomical Society, 3571 - 3583. https://doi.org/10.1093/mnras/stac113

BEBOP is a radial-velocity survey that monitors a sample of single-lined eclipsing binaries, in search of circumbinary planets by using high-resolution spectrographs. Here, we describe and test the methods we use to identify planetary signals within... Read More about BEBOP II: sensitivity to sub-Saturn circumbinary planets using radial-velocities.

A pair of sub-Neptunes transiting the bright K-dwarf TOI-1064 characterized with CHEOPS (2022)
Journal Article
Maxted. (2022). A pair of sub-Neptunes transiting the bright K-dwarf TOI-1064 characterized with CHEOPS. Monthly Notices of the Royal Astronomical Society, 1043 - 1071. https://doi.org/10.1093/mnras/stab3799

We report the discovery and characterization of a pair of sub-Neptunes transiting the bright K-dwarf TOI-1064 (TIC 79748331), initially detected in the Transiting Exoplanet Survey Satellite (TESS) photometry. To characterize the system, we performed... Read More about A pair of sub-Neptunes transiting the bright K-dwarf TOI-1064 characterized with CHEOPS.

Detection of the tidal deformation of WASP-103b at 3 s with CHEOPS (2022)
Journal Article
Maxted. (2022). Detection of the tidal deformation of WASP-103b at 3 s with CHEOPS. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/202142196

Context. Ultra-short period planets undergo strong tidal interactions with their host star which lead to planet deformation and orbital tidal decay.

Aims. WASP-103b is the exoplanet with the highest expected deformation signature in its transit li... Read More about Detection of the tidal deformation of WASP-103b at 3 s with CHEOPS.

TIC 172900988: A Transiting Circumbinary Planet Detected in One Sector of TESS Data (2021)
Journal Article
Hellier, & Maxted. (2021). TIC 172900988: A Transiting Circumbinary Planet Detected in One Sector of TESS Data. Astronomical Journal, https://doi.org/10.3847/1538-3881/ac223a

We report the first discovery of a transiting circumbinary planet detected from a single sector of Transiting Exoplanet Survey Satellite (TESS) data. During Sector 21, the planet TIC 172900988b transited the primary star and then five days later it t... Read More about TIC 172900988: A Transiting Circumbinary Planet Detected in One Sector of TESS Data.

Analysis of Early Science observations with the CHaracterising ExOPlanets Satellite (CHEOPS) using pycheops (2021)
Journal Article
Maxted, P. F. L., Ehrenreich, D., Wilson, T. G., Alibert, Y., Cameron, A. C., Hoyer, S., Sousa, S. G., Olofsson, G., Bekkelien, A., Deline, A., Delrez, L., Bonfanti, A., Borsato, L., Alonso, R., Anglada Escudé, G., Barrado, D., Barros, S. C. C., Baumjohann, W., Beck, M., Beck, T., …Walton, N. A. (2022). Analysis of Early Science observations with the CHaracterising ExOPlanets Satellite (CHEOPS) using pycheops. Monthly Notices of the Royal Astronomical Society, 514(1), 77-104. https://doi.org/10.1093/mnras/stab3371

CHEOPS (CHaracterising ExOPlanet Satellite) is an ESA S-class mission that observes bright stars at high cadence from low-Earth orbit. The main aim of the mission is to characterize exoplanets that transit nearby stars using ultrahigh precision photo... Read More about Analysis of Early Science observations with the CHaracterising ExOPlanets Satellite (CHEOPS) using pycheops.

The changing face of AU Mic b: stellar spots, spin-orbit commensurability, and transit timing variations as seen by CHEOPS and TESS (2021)
Journal Article
Maxted. (2021). The changing face of AU Mic b: stellar spots, spin-orbit commensurability, and transit timing variations as seen by CHEOPS and TESS. Astronomy & Astrophysics, 654, Article A159

AU Mic is a young planetary system with a resolved debris disc showing signs of planet formation and two transiting warm Neptunes near mean-motion resonances. Here we analyse three transits of AU Mic b observed with the CHaracterising ExOPlanet Satel... Read More about The changing face of AU Mic b: stellar spots, spin-orbit commensurability, and transit timing variations as seen by CHEOPS and TESS.

CHEOPS precision phase curve of the Super-Earth 55 Cancri e (2021)
Journal Article
Maxted. (2021). CHEOPS precision phase curve of the Super-Earth 55 Cancri e. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/202140892

Context. 55 Cnc e is a transiting super-Earth (radius 1.88 R? and mass 8 M?) orbiting a G8V host star on a 17-h orbit. Spitzer observations of the planet’s phase curve at 4.5 µm revealed a time-varying occultation depth, and MOST optical observations... Read More about CHEOPS precision phase curve of the Super-Earth 55 Cancri e.

The EBLM project - VIII. First results for M-dwarf mass, radius, and effective temperature measurements using CHEOPS light curves (2021)
Journal Article
Hellier, & Maxted. (2021). The EBLM project - VIII. First results for M-dwarf mass, radius, and effective temperature measurements using CHEOPS light curves. Monthly Notices of the Royal Astronomical Society, 306 - 322. https://doi.org/10.1093/mnras/stab1687

The accuracy of theoretical mass, radius, and effective temperature values for M-dwarf stars is an active topic of debate. Differences between observed and theoretical values have raised the possibility that current theoretical stellar structure and... Read More about The EBLM project - VIII. First results for M-dwarf mass, radius, and effective temperature measurements using CHEOPS light curves.