All Outputs (215)

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.

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.

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. (in press). Magnetic origin of the discrepancy between stellar limb-darkening models and observations. Nature Astronomy, 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.

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..

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.

Asymmetry in the atmosphere of the ultra-hot Jupiter WASP-76 b (2024)
Journal Article
Demangeon, O. D. S., Cubillos, P. E., Singh, V., Wilson, T. G., Carone, L., Bekkelien, A., …Walton, N. A. (2024). Asymmetry in the atmosphere of the ultra-hot Jupiter WASP-76 b. Astronomy & Astrophysics, 684, Article A27. https://doi.org/10.1051/0004-6361/202348270

Context. WASP-76 b has been a recurrent subject of study since the detection of a signature in high-resolution transit spectroscopy data indicating an asymmetry between the two limbs of the planet. The existence of this asymmetric signature has been... Read More about Asymmetry in the atmosphere of the ultra-hot Jupiter WASP-76 b.

Planets observed with CHEOPS: Two super-Earths orbiting the red dwarf star TOI-776 (2024)
Journal Article
Fridlund, M., Georgieva, I. Y., Bonfanti, A., Alibert, Y., Persson, C. M., Gandolfi, D., …Walton, N. A. (2024). Planets observed with CHEOPS: Two super-Earths orbiting the red dwarf star TOI-776. Astronomy & Astrophysics, 684, Article A12. https://doi.org/10.1051/0004-6361/202243838

Context. M-dwarf stars are the most common of potential exoplanet host stars in the Galaxy. It is therefore very important to understand planetary systems orbiting such stars and to determine the physical parameters of such planets with high precisio... Read More about Planets observed with CHEOPS: Two super-Earths orbiting the red dwarf star TOI-776.

CHEOPS observations of KELT-20 b/MASCARA-2 b: An aligned orbit and signs of variability from a reflective day side (2024)
Journal Article
Singh, V., Scandariato, G., Smith, A. M. S., Cubillos, P. E., Lendl, M., Billot, N., …Zingales, T. (2024). CHEOPS observations of KELT-20 b/MASCARA-2 b: An aligned orbit and signs of variability from a reflective day side. Astronomy & Astrophysics, 683, Article A1. https://doi.org/10.1051/0004-6361/202347533

Context. Occultations are windows of opportunity to indirectly peek into the dayside atmosphere of exoplanets. High-precision transit events provide information on the spin-orbit alignment of exoplanets around fast-rotating hosts. Aims. We aim to... Read More about CHEOPS observations of KELT-20 b/MASCARA-2 b: An aligned orbit and signs of variability from a reflective day side.

The EBLM Project– XI. Mass, radius, and effective temperature measurements for 23 M-dwarf companions to solar-type stars observed with CHEOPS (2024)
Journal Article
Swayne, M. I., Maxted, P. F. L., Triaud, A. H. M. J., Sousa, S. G., Deline, A., Ehrenreich, D., …Wilson, T. G. (2024). The EBLM Project– XI. Mass, radius, and effective temperature measurements for 23 M-dwarf companions to solar-type stars observed with CHEOPS. Monthly Notices of the Royal Astronomical Society, 528(4), 5703-5722. https://doi.org/10.1093/mnras/stad3866

Observations of low-mass stars have frequently shown a disagreement between observed stellar radii and radii predicted by theoretical stellar structure models. This ‘radius inflation’ problem could have an impact on both stellar and exoplanetary scie... Read More about The EBLM Project– XI. Mass, radius, and effective temperature measurements for 23 M-dwarf companions to solar-type stars observed with CHEOPS.

Constraining the reflective properties of WASP-178 b using CHEOPS photometry (2024)
Journal Article
Pagano, I., Scandariato, G., Singh, V., Lendl, M., Queloz, D., Simon, A. E., …Walton, N. A. (2024). Constraining the reflective properties of WASP-178 b using CHEOPS photometry. Astronomy & Astrophysics, 682, Article A102. https://doi.org/10.1051/0004-6361/202346705

Context. Multiwavelength photometry of the secondary eclipses of extrasolar planets is able to disentangle the reflected and thermally emitted light radiated from the planetary dayside. Based on this, we can measure the planetary geometric albedo Ag,... Read More about Constraining the reflective properties of WASP-178 b using CHEOPS photometry.

Characterising TOI-732 b and c: New insights into the M-dwarf radius and density valley (2024)
Journal Article
Bonfanti, A., Brady, M., Wilson, T. G., Venturini, J., Egger, J. A., Brandeker, A., …Zingales, T. (2024). Characterising TOI-732 b and c: New insights into the M-dwarf radius and density valley. Astronomy & Astrophysics, 682, Article A66. https://doi.org/10.1051/0004-6361/202348180

Context. TOI-732 is an M dwarf hosting two transiting planets that are located on the two opposite sides of the radius valley. Inferring a reliable demographics for this type of systems is key to understanding their formation and evolution mechanisms... Read More about Characterising TOI-732 b and c: New insights into the M-dwarf radius and density valley.

A resonant sextuplet of sub-Neptunes transiting the bright star HD 110067. (2023)
Journal Article
Luque, R., Osborn, H. P., Leleu, A., Pallé, E., Bonfanti, A., Barragán, O., …Zingales, T. (in press). A resonant sextuplet of sub-Neptunes transiting the bright star HD 110067. Nature, 623(7989), 932-937. https://doi.org/10.1038/s41586-023-06692-3

Planets with radii between that of the Earth and Neptune (hereafter referred to as 'sub-Neptunes') are found in close-in orbits around more than half of all Sun-like stars . However, their composition, formation and evolution remain poorly understood... Read More about A resonant sextuplet of sub-Neptunes transiting the bright star HD 110067..

The EBLM Project—From False Positives to Benchmark Stars and Circumbinary Exoplanets (2023)
Journal Article
Maxted, P. F. L., Triaud, A. H. M. J., & Martin, D. V. (in press). The EBLM Project—From False Positives to Benchmark Stars and Circumbinary Exoplanets. Universe, 9(12), Article 498. https://doi.org/10.3390/universe9120498

The EBLM project aims to characterise very-low-mass stars that are companions to solar-type stars in eclipsing binaries. We describe the history and motivation for this project, the methodology we use to obtain the precise mass, radius, and effective... Read More about The EBLM Project—From False Positives to Benchmark Stars and Circumbinary Exoplanets.

CHEOPS and TESS view of the ultra-short-period super-Earth TOI-561 b (2023)
Journal Article
Patel, J. A., Egger, J. A., Wilson, T. G., Bourrier, V., Carone, L., Beck, M., …Walton, N. A. (2023). CHEOPS and TESS view of the ultra-short-period super-Earth TOI-561 b. Astronomy & Astrophysics, 679, Article A92. https://doi.org/10.1051/0004-6361/202244946

Context. Ultra-short-period planets (USPs) are a unique class of super-Earths with an orbital period of less than a day, and hence they are subject to intense radiation from their host star. These planets cannot retain a primordial H/He atmosphere, a... Read More about CHEOPS and TESS view of the ultra-short-period super-Earth TOI-561 b.

Refining the properties of the TOI-178 system with CHEOPS and TESS (2023)
Journal Article
Delrez, L., Leleu, A., Brandeker, A., Gillon, M., Hooton, M. J., Collier Cameron, A., …Winn, J. N. (2023). Refining the properties of the TOI-178 system with CHEOPS and TESS. Astronomy & Astrophysics, 678, Article A200. https://doi.org/10.1051/0004-6361/202245479

Context. The TOI-178 system consists of a nearby late K-dwarf transited by six planets in the super-Earth to mini-Neptune regime, with radii ranging from ~1.1 to 2.9 R⊕ and orbital periods between 1.9 and 20.7 days. All planets but the innermost one... Read More about Refining the properties of the TOI-178 system with CHEOPS and TESS.

Radial-velocity discovery of a second planet in the TOI-1338/BEBOP-1 circumbinary system (2023)
Journal Article
Standing, M. R., Sairam, L., Martin, D. V., Triaud, A. H. M. J., Correia, A. C. M., Coleman, G. A. L., …Welsh, W. F. (in press). Radial-velocity discovery of a second planet in the TOI-1338/BEBOP-1 circumbinary system. Nature Astronomy, 7(6), 702-714. https://doi.org/10.1038/s41550-023-01948-4

TOI-5678b: A 48-day transiting Neptune-mass planet characterized with CHEOPS and HARPS (2023)
Journal Article
Ulmer-Moll, S., Osborn, H. P., Tuson, A., Egger, J. A., Lendl, M., Maxted, P., …Walton, N. A. (2023). TOI-5678b: A 48-day transiting Neptune-mass planet characterized with CHEOPS and HARPS. Astronomy & Astrophysics, 674, Article A43. https://doi.org/10.1051/0004-6361/202245478

Context. A large sample of long-period giant planets has been discovered thanks to long-term radial velocity surveys, but only a few dozen of these planets have a precise radius measurement. Transiting gas giants are crucial targets for the study of... Read More about TOI-5678b: A 48-day transiting Neptune-mass planet characterized with CHEOPS and HARPS.

Refined parameters of the HD 22946 planetary system and the true orbital period of planet d (2023)
Journal Article
Garai, Z., Osborn, H. P., Gandolfi, D., Brandeker, A., Sousa, S. G., Lendl, M., …Walton, N. (2023). Refined parameters of the HD 22946 planetary system and the true orbital period of planet d. Astronomy & Astrophysics, 674, Article A44. https://doi.org/10.1051/0004-6361/202345943

Context. Multi-planet systems are important sources of information regarding the evolution of planets. However, the long-period planets in these systems often escape detection. These objects in particular may retain more of their primordial character... Read More about Refined parameters of the HD 22946 planetary system and the true orbital period of planet d.

Fundamental effective temperature measurements for eclipsing binary stars – IV. Selection of new benchmark stars and first results for HD 22064 (2023)
Journal Article
Maxted. (2023). Fundamental effective temperature measurements for eclipsing binary stars – IV. Selection of new benchmark stars and first results for HD 22064. Monthly Notices of the Royal Astronomical Society, 522(2), 2683 - 2695. https://doi.org/10.1093/mnras/stad1112

I describe the selection and initial characterization of 20 eclipsing binary stars that are suitable for calibration and testing of stellar models and data analysis algorithms used by the PLATO mission and spectroscopic surveys. The binary stars sele... Read More about Fundamental effective temperature measurements for eclipsing binary stars – IV. Selection of new benchmark stars and first results for HD 22064.