Pierre Maxted's Outputs (229)

Architecture of TOI-561 planetary system (2024)
Journal Article
Piotto, G., Zingales, T., Borsato, L., Egger, J. A., Correia, A. C. M., Simon, A. E., …Wolf, S. (in press). Architecture of TOI-561 planetary system. Monthly Notices of the Royal Astronomical Society, 535(3), 2763-2774. https://doi.org/10.1093/mnras/stae2440

We present new observations from CHEOPS (CHaracterising ExOPlanet Satellite) and TESS (Transiting Exoplanet Survey Satellite) to clarify the architecture of the planetary system hosted by the old Galactic thick disc star TOI-561. Our global analysis,... Read More about Architecture of TOI-561 planetary system.

The K2-24 planetary system revisited by CHEOPS (2024)
Journal Article
Nascimbeni, V., Borsato, L., Leonardi, P., Sousa, S. G., Wilson, T. G., Fortier, A., …Walton, N. A. (2024). The K2-24 planetary system revisited by CHEOPS. Astronomy & Astrophysics, 690, Article A349. https://doi.org/10.1051/0004-6361/202450852

The planetary system K2-24 is composed of two transiting low-density Neptunians locked in an almost perfect 2:1 resonance and showing large transit time variations (TTVs), and it is an excellent laboratory to search for signatures of planetary migrat... Read More about The K2-24 planetary system revisited by CHEOPS.

Revised temperatures for two benchmark M-dwarfs – outliers no more (2024)
Journal Article
Martin, D. V., Armitage, T., Duck, A., Swayne, M. I., Martínez, R. R., Sethi, R., …Maxted, P. F. L. (2024). Revised temperatures for two benchmark M-dwarfs – outliers no more. Monthly Notices of the Royal Astronomical Society, 1-10. https://doi.org/10.1093/mnras/stae2266

Well-characterised M-dwarfs are rare, particularly with respect to effective temperature. In this letter we re-analyse two benchmark M-dwarfs in eclipsing binaries from Kepler/K2: KIC 1571511AB and HD 24465AB. Both have temperatures reported to be ho... Read More about Revised temperatures for two benchmark M-dwarfs – outliers no more.

A regularization technique to precisely infer limb darkening using transit measurements: can we estimate stellar surface magnetic fields? (2024)
Journal Article
Verma, K., Maxted, P. F. L., Singh, A., Ludwig, H.-G., & Sable, Y. (2024). A regularization technique to precisely infer limb darkening using transit measurements: can we estimate stellar surface magnetic fields?. Monthly Notices of the Royal Astronomical Society, 534(4), 3893-3905. https://doi.org/10.1093/mnras/stae2344

The high-precision measurements of exoplanet transit light curves that are now available contain information about the planet properties, their orbital parameters, and stellar limb darkening (LD). Recent 3D magneto-hydrodynamical (MHD) simulations of... Read More about A regularization technique to precisely infer limb darkening using transit measurements: can we estimate stellar surface magnetic fields?.

BEBOP VI. enabling the detection of circumbinary planets orbiting double-lined binaries with the DOLBY method of radial-velocity extraction (2024)
Journal Article
Sairam, L., Baycroft, T. A., Boisse, I., Heidari, N., Santerne, A., Triaud, A. H. M. J., …Standing, M. R. (in press). BEBOP VI. enabling the detection of circumbinary planets orbiting double-lined binaries with the DOLBY method of radial-velocity extraction. Monthly Notices of the Royal Astronomical Society, 534(4), 3999-4017. https://doi.org/10.1093/mnras/stae2317

Circumbinary planets, orbiting both stars in a binary system, offer the opportunity to study planet formation and orbital migration in an environment different from that around single stars. However, despite the fact that $> 90~{{\%}}$ of binary s... Read More about BEBOP VI. enabling the detection of circumbinary planets orbiting double-lined binaries with the DOLBY method of radial-velocity extraction.

Unveiling the internal structure and formation history of the three planets transiting HIP 29442 (TOI-469) with CHEOPS (2024)
Journal Article
Egger, J. A., Osborn, H. P., Kubyshkina, D., Mordasini, C., Alibert, Y., Günther, M. N., …Walton, N. A. (2024). Unveiling the internal structure and formation history of the three planets transiting HIP 29442 (TOI-469) with CHEOPS. Astronomy & Astrophysics, 688, Article A223. https://doi.org/10.1051/0004-6361/202450472

Multiplanetary systems spanning the radius valley are ideal testing grounds for exploring the different proposed explanations for the observed bimodality in the radius distribution of close-in exoplanets. One such system is HIP 29442 (TOI-469), an ev... Read More about Unveiling the internal structure and formation history of the three planets transiting HIP 29442 (TOI-469) with CHEOPS.

Photo-dynamical characterisation of the TOI-178 resonant chain: Exploring the robustness of transit-timing variations and radial velocity mass characterisations (2024)
Journal Article
Leleu, A., Delisle, J.-B., Delrez, L., Bryant, E. M., Brandeker, A., Osborn, H. P., …Zivave, T. (2024). Photo-dynamical characterisation of the TOI-178 resonant chain: Exploring the robustness of transit-timing variations and radial velocity mass characterisations. Astronomy & Astrophysics, 688, Article A211. https://doi.org/10.1051/0004-6361/202450212

Context. The TOI-178 system consists of a nearby, late-K-dwarf with six transiting planets in the super-Earth to mini-Neptune regime, with radii ranging from to 2.9 R⊕ and orbital periods between 1.9 and 20.7 days. All the planets, but the innermost... Read More about Photo-dynamical characterisation of the TOI-178 resonant chain: Exploring the robustness of transit-timing variations and radial velocity mass characterisations.

TOI–757 b: an eccentric transiting mini–Neptune on a 17.5–d orbit (2024)
Journal Article
Alqasim, A., Grieves, N., Rosário, N. M., Gandolfi, D., Livingston, J. H., Sousa, S., …Yee, S. W. (2024). TOI–757 b: an eccentric transiting mini–Neptune on a 17.5–d orbit. Monthly Notices of the Royal Astronomical Society, 533(1), 1-26. https://doi.org/10.1093/mnras/stae1767

We report the spectroscopic confirmation and fundamental properties of TOI$-$757 b, a mini$-$Neptune on a 17.5$-$d orbit transiting a bright star ($V\, =\, 9.7$ mag) discovered by the TESS mission. We acquired high$-$precision radial velocity measure... Read More about TOI–757 b: an eccentric transiting mini–Neptune on a 17.5–d orbit.

CHEOPS in-flight performance: A comprehensive look at the first 3.5 yr of operations (2024)
Journal Article
Fortier, A., Simon, A. E., Broeg, C., Olofsson, G., Deline, A., Wilson, T. G., …Wolter, D. (2024). CHEOPS in-flight performance: A comprehensive look at the first 3.5 yr of operations. Astronomy & Astrophysics, 687, Article A302. https://doi.org/10.1051/0004-6361/202348576

Context. Since the discovery of the first exoplanet almost three decades ago, the number of known exoplanets has increased dramatically. By beginning of the 2000s it was clear that dedicated facilities to advance our studies in this field were needed... Read More about CHEOPS in-flight performance: A comprehensive look at the first 3.5 yr of operations.

HIP 41378 observed by CHEOPS: Where is planet d? (2024)
Journal Article
Sulis, S., Borsato, L., Grouffal, S., Osborn, H. P., Santerne, A., Brandeker, A., …Zingales, T. (2024). HIP 41378 observed by CHEOPS: Where is planet d?. Astronomy & Astrophysics, 686, Article L18. https://doi.org/10.1051/0004-6361/202449689

HIP 41378 d is a long-period planet that has only been observed to transit twice, three years apart, with K2. According to stability considerations and a partial detection of the Rossiter–McLaughlin effect, Pd = 278.36 d has been determined to be the... Read More about HIP 41378 observed by CHEOPS: Where is planet d?.

Detailed cool star flare morphology with CHEOPS and TESS (2024)
Journal Article
Bruno, G., Pagano, I., Scandariato, G., Florén, H.-G., Brandeker, A., Olofsson, G., …Wilson, T. G. (2024). Detailed cool star flare morphology with CHEOPS and TESS. Astronomy & Astrophysics, 686, Article A239. https://doi.org/10.1051/0004-6361/202348951

Context. White-light stellar flares are proxies for some of the most energetic types of flares, but their triggering mechanism is still poorly understood. As they are associated with strong X and ultraviolet emission, their study is particularly rele... Read More about Detailed cool star flare morphology with CHEOPS and TESS.

Fundamental effective temperature measurements for eclipsing binary stars – V. The circumbinary planet system EBLM J0608–59 (2024)
Journal Article
Maxted, P. F. L., Miller, N. J., Sebastian, D., Triaud, A. H. M. J., Martin, D. V., & Duck, A. (2024). Fundamental effective temperature measurements for eclipsing binary stars – V. The circumbinary planet system EBLM J0608–59. Monthly Notices of the Royal Astronomical Society, 531(4), 4577-4583. https://doi.org/10.1093/mnras/stae1434

EBLM J0608$-$59/TOI-1338/BEBOP-1 is a 12$^{\rm th}$-magnitude, F9 V star in an eclipsing binary with a much fainter M dwarf companion on a wide, eccentric orbit (P = 14.6 d). The binary is orbited by two circumbinary planets: one transiting on a 95-d... Read More about Fundamental effective temperature measurements for eclipsing binary stars – V. The circumbinary planet system EBLM J0608–59.

BEBOP V. Homogeneous stellar analysis of potential circumbinary planet hosts (2024)
Journal Article
Freckelton, A. V., Sebastian, D., Mortier, A., Triaud, A. H. M. J., Maxted, P. F. L., Acuña, L., …Willett, E. (2024). BEBOP V. Homogeneous stellar analysis of potential circumbinary planet hosts. Monthly Notices of the Royal Astronomical Society, 531(4), 4085-4098. https://doi.org/10.1093/mnras/stae1405

Planets orbiting binary systems are relatively unexplored compared to those around single stars. Detections of circumbinary planets and planetary systems offer a first detailed view into our understanding of circumbinary planet formation and dynamica... Read More about BEBOP V. Homogeneous stellar analysis of potential circumbinary planet hosts.

Seven new triply eclipsing triple star systems (2024)
Journal Article
Rappaport, S. A., Borkovits, T., Mitnyan, T., Gagliano, R., Eisner, N., Jacobs, T., …Vanderburg, A. (2024). Seven new triply eclipsing triple star systems. Astronomy & Astrophysics, 686(A27), https://doi.org/10.1051/0004-6361/202449273

Aims. We have identified nearly a hundred close triply eclipsing hierarchical triple star systems from data taken with the space telescope TESS. These systems are noteworthy in that we can potentially determine their dynamical and astrophysical param... Read More about Seven new triply eclipsing triple star systems.

An extended low-density atmosphere around the Jupiter-sized planet WASP-193 b (2024)
Journal Article
Barkaoui, K., Pozuelos, F. J., Hellier, C., Smalley, B., Nielsen, L. D., Niraula, P., …West, R. G. (in press). An extended low-density atmosphere around the Jupiter-sized planet WASP-193 b. Nature Astronomy, https://doi.org/10.1038/s41550-024-02259-y

Gas giants transiting bright nearby stars provide crucial insights into planetary system formation and evolution mechanisms. Most of these planets show certain average characteristics, serving as benchmarks for our understanding of planetary systems.... Read More about An extended low-density atmosphere around the Jupiter-sized planet WASP-193 b.

The tidal deformation and atmosphere of WASP-12 b from its phase curve (2024)
Journal Article
Akinsanmi, B., Barros, S. C. C., Lendl, M., Carone, L., Cubillos, P. E., Bekkelien, A., …Walton, N. A. (2024). The tidal deformation and atmosphere of WASP-12 b from its phase curve. Astronomy & Astrophysics, 685, Article A63. https://doi.org/10.1051/0004-6361/202348502

Context. Ultra-hot Jupiters present a unique opportunity to understand the physics and chemistry of planets, their atmospheres, and interiors at extreme conditions. WASP-12 b stands out as an archetype of this class of exoplanets, with a close-in orb... Read More about The tidal deformation and atmosphere of WASP-12 b from its phase curve.

Discovery of two warm mini-Neptunes with contrasting densities orbiting the young K3V star TOI-815 (2024)
Journal Article
Psaridi, A., Osborn, H., Bouchy, F., Lendl, M., Parc, L., Billot, N., …West, R. G. (2024). Discovery of two warm mini-Neptunes with contrasting densities orbiting the young K3V star TOI-815. Astronomy & Astrophysics, 685, Article A5. https://doi.org/10.1051/0004-6361/202348678

We present the discovery and characterization of two warm mini-Neptunes transiting the K-V star TOI-815 in a K-M binary system. Analysis of its spectra and rotation period reveal the star to be young, with an age of 200(-200)(+400) Myr. TOI-815b has... Read More about Discovery of two warm mini-Neptunes with contrasting densities orbiting the young K3V star TOI-815.

The EBLM Project XII. An eccentric, long-period eclipsing binary with a companion near the hydrogen-burning limit (2024)
Journal Article
Davis, Y. T., Triaud, A. H. M. J., Freckelton, A. V., Mortier, A., Brahm, R., Sebastian, D., …Udry, S. (2024). The EBLM Project XII. An eccentric, long-period eclipsing binary with a companion near the hydrogen-burning limit. Monthly Notices of the Royal Astronomical Society, 530(3), https://doi.org/10.1093/mnras/stae842

In the hunt for Earth-like exoplanets it is crucial to have reliable host star parameters, as they have a direct impact on the accuracy and precision of the inferred parameters for any discovered exoplanet. For stars with masses between 0.35 and 0.5... Read More about The EBLM Project XII. An eccentric, long-period eclipsing binary with a companion near the hydrogen-burning limit.

The EBLM project – XIII. The absolute dynamical masses of the circumbinary planet host TOI-1338/BEBOP-1, and applications to the study of exoplanet atmospheres. (2024)
Journal Article
Sebastian, D., Triaud, A. H. M. J., Brogi, M., Baycroft, T. A., Standing, M. R., Maxted, P. F. L., …Nielsen, M. B. (2024). The EBLM project – XIII. The absolute dynamical masses of the circumbinary planet host TOI-1338/BEBOP-1, and applications to the study of exoplanet atmospheres. Monthly Notices of the Royal Astronomical Society, 530(3), 2572–2589. https://doi.org/10.1093/mnras/stae459

High-contrast eclipsing binaries with low mass M-dwarf secondaries are precise benchmark stars to build empirical mass-radius relationships for fully convective low-mass ($\rm M_{\star } < 0.35\, M_{\odot }$) dwarf stars. The contributed light... Read More about The EBLM project – XIII. The absolute dynamical masses of the circumbinary planet host TOI-1338/BEBOP-1, and applications to the study of exoplanet atmospheres..

Magnetic origin of the discrepancy between stellar limb-darkening models and observations (2024)
Journal Article
Kostogryz, N. M., Shapiro, A. I., Witzke, V., Cameron, R. H., Gizon, L., Krivova, N. A., …Valenti, J. (2024). Magnetic origin of the discrepancy between stellar limb-darkening models and observations. Nature Astronomy, 8(7), 929-937. https://doi.org/10.1038/s41550-024-02252-5

Stars appear darker at their limbs than at their disk centres because at the limb we are viewing the higher and cooler layers of stellar photospheres. Yet, limb darkening derived from state-of-the-art stellar atmosphere models systematically fails to... Read More about Magnetic origin of the discrepancy between stellar limb-darkening models and observations.