Outputs (215)

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., Maxted, P. F. L., Brandeker, A., Collier Cameron, A., Beck, M., Bekkelien, A., Billot, N., Bonfanti, A., Bruno, G., Cabrera, J., Delrez, L., Demory, B.-O., Futyan, D., Florén, H.-G., Günther, M. N., …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., Günther, M. N., Heitzmann, A., Lendl, M., Fridlund, M., Gandolfi, D., Alibert, Y., Alonso, R., Bárczy, T., Barrado Navascues, D., Barros, S. C. C., Baumjohann, W., Beck, T., Benz, W., Bergomi, M., …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., Maxted, P. F. L., Fortier, A., Sousa, S. G., Sulis, S., Van Grootel, V., Garai, Z., Boldog, A., Kriskovics, L., Szabó, G. M., Gandolfi, D., Alibert, Y., Alonso, R., Bárczy, T., Barrado Navascues, D., …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., Armstrong, D. J., Battley, M. P., Baycroft, T. A., Boisse, I., Bourrier, V., Carmona, A., Coleman, G. A. L., Cameron, A. C., Cortés-Zuleta, P., Delfosse, X., Dransfield, G., Duck, A., Forveille, T., French, J. R., …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., Tokovinin, A., Powell, B., Kostov, V., Omohundro, M., Kristiansen, M. H., Jayaraman, R., Terentev, I., Schwengeler, H. M., LaCourse, D., Garai, Z., Pribulla, T., Maxted, P. F. L., Bíró, I. B., Csányi, I., …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., Gillon, M., de Wit, J., Müller, S., Dorn, C., Helled, R., Jehin, E., Demory, B.-O., Van Grootel, V., Soubkiou, A., Ghachoui, M., Anderson, D. R., Benkhaldoun, Z., Bouchy, F., Burdanov, A., …West, R. G. (2024). 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., Fortier, A., Florén, H.-G., Collier Cameron, A., Boué, G., Bruno, G., Demory, B.-O., Brandeker, A., Sousa, S. G., Wilson, T. G., Deline, A., Bonfanti, A., Scandariato, G., Hooton, M. J., Correia, A. C. M., …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., Broeg, C., Sousa, S. G., Adibekyan, V., Attia, O., Bonfanti, A., Chakraborty, H., Collins, K. A., Davoult, J., Delgado-Mena, E., Grieves, N., Guillot, T., Heitzmann, A., Helled, R., Hellier, C., …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.

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., Ludwig, H.-G., Maxted, P. F. L., Seager, S., Solanki, S. K., & 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.