All Outputs (241)

Equivalent Width of the Interstellar Na i D 1 and D 2 Absorption Lines for Stars with E ( B − V ) < 0.15 (2025)
Journal Article
Maxted, P. F. L. (2025). Equivalent Width of the Interstellar Na i D 1 and D 2 Absorption Lines for Stars with E ( B − V ) < 0.15. Research Notes of the American Astronomical Society, 9(6), 1-5. https://doi.org/10.3847/2515-5172/ade39b

New measurements of the equivalent width of the interstellar Na i D1 and D2 absorption lines for 62 bright B-type stars with E(B − V) < 0.15 are used to recalibrate the relation between these quantities in this low-reddening regime, and to quantify t... Read More about Equivalent Width of the Interstellar Na i D 1 and D 2 Absorption Lines for Stars with E ( B − V ) < 0.15.

EBLM XV – Revised dynamical masses for the circumbinary planet host Kepler-16 AB, using the SOPHIE spectrograph (2025)
Journal Article
Sebastian, D., Boisse, I., Santerne, A., Triaud, A. H. M. J., Baycroft, T. A., Davis, Y. T., Deleuil, M., Grouffal, S., Hébrard, G., Heidari, N., Martin, D. V., Maxted, P. F. L., Nelson, R. P., Lalitha, S., Scott, M. G., Scutt, O. J., & Standing, M. (in press). EBLM XV – Revised dynamical masses for the circumbinary planet host Kepler-16 AB, using the SOPHIE spectrograph. Monthly Notices of the Royal Astronomical Society, https://doi.org/10.1093/mnras/staf863

Eclipsing binaries are perfect laboratories to measure precise, accurate and model-independent stellar radii and stellar masses, so long as both components are spectroscopically resolved. Resolving both components is difficult in high-contrast binari... Read More about EBLM XV – Revised dynamical masses for the circumbinary planet host Kepler-16 AB, using the SOPHIE spectrograph.

A Swarm of WASP Planets: Nine Giant Planets Identified by the WASP Survey (2025)
Journal Article
Schanche, N., Hébrard, G., Stassun, K. G., Hord, B., Barkaoui, K., Bieryla, A., Ciardi, D., Collins, K. A., Collier Cameron, A., Hartman, J., Heidari, N., Hellier, C., Howell, S. B., Lendl, M., McCormac, J., McLeod, K. K., Parviainen, H., Radford, D., Rajpurohit, A. S., Relles, H., …Winn, J. (2025). A Swarm of WASP Planets: Nine Giant Planets Identified by the WASP Survey. Astronomical Journal, 169(6), Article 334. https://doi.org/10.3847/1538-3881/adccc6

The Wide Angle Search for Planets (WASP) survey provided some of the first transiting hot Jupiter candidates. With the addition of the Transiting Exoplanet Survey Satellite (TESS), many WASP planet candidates have now been revisited and given updated... Read More about A Swarm of WASP Planets: Nine Giant Planets Identified by the WASP Survey.

Benchmark stars for mean stellar density and surface gravity estimates of solar-type stars (2025)
Journal Article
Maxted, P. F. L. (2025). Benchmark stars for mean stellar density and surface gravity estimates of solar-type stars. Monthly Notices of the Royal Astronomical Society, 539(4), 3741-3757. https://doi.org/10.1093/mnras/staf735

Adding an independent estimate of the mean stellar density, , as a constraint in the analysis of stars that host transiting exoplanets can significantly improve the precision of the planet radius estimate in cases where the light curve is too noisy t... Read More about Benchmark stars for mean stellar density and surface gravity estimates of solar-type stars.

A joint effort to discover and characterize two resonant mini-Neptunes around TOI-1803 with TESS, HARPS-N, and CHEOPS (2025)
Journal Article
Zingales, T., Malavolta, L., Borsato, L., Turrini, D., Bonfanti, A., Polychroni, D., Mantovan, G., Nardiello, D., Nascimbeni, V., Lanza, A. F., Bekkelien, A., Sozzetti, A., Broeg, C., Naponiello, L., Lendl, M., Bonomo, A. S., Simon, A. E., Desidera, S., Piotto, G., Mancini, L., …Winn, J. N. (2025). A joint effort to discover and characterize two resonant mini-Neptunes around TOI-1803 with TESS, HARPS-N, and CHEOPS. Astronomy & Astrophysics, 695(March 2025), Article A273. https://doi.org/10.1051/0004-6361/202451180

Context. The discovery and characterization of mini-Neptunes hold a potentially crucial impact on planetary formation and evolution theories. Estimating their orbital parameters and atmospheric properties would provide valuable hints to improve forma... Read More about A joint effort to discover and characterize two resonant mini-Neptunes around TOI-1803 with TESS, HARPS-N, and CHEOPS.

The EBLM project – XIV. TESS light curves for eclipsing binaries with very low mass companions (2025)
Journal Article
Fitzpatrick, J., Maxted, P. F. L., Freckelton, A. V., Triaud, A. H. M. J., Martin, D. V., & Duck, A. (in press). The EBLM project – XIV. TESS light curves for eclipsing binaries with very low mass companions. Monthly Notices of the Royal Astronomical Society, 537(4), 3943–3953. https://doi.org/10.1093/mnras/staf268

Accurate limb-darkening models are needed for accurate characterisation of eclipsing binary stars and transiting exoplanets from the analysis of their light curves. The limb-darkening observed in solar-type stars from the analysis of light curves for... Read More about The EBLM project – XIV. TESS light curves for eclipsing binaries with very low mass companions.

Transit-timing variations in the AU Mic system observed with CHEOPS (2025)
Journal Article
Boldog, Á., Szabó, G. M., Kriskovics, L., Borsato, L., Gandolfi, D., Lendl, M., Günther, M. N., Heitzmann, A., Wilson, T. G., Brandeker, A., Garai, Z., Alibert, Y., Alonso, R., Bárczy, T., Barrado Navascues, D., Barros, S. C. C., Baumjohann, W., Benz, W., Billot, N., Broeg, C., …Zingales, T. (2025). Transit-timing variations in the AU Mic system observed with CHEOPS. Astronomy & Astrophysics, 694, Article A137. https://doi.org/10.1051/0004-6361/202452699

Context. AU Mic is a very active M dwarf star with an edge-on debris disk and two known transiting sub-Neptunes with a possible third planetary companion. The two transiting planets exhibit significant transit-timing variations (TTVs) that are caused... Read More about Transit-timing variations in the AU Mic system observed with CHEOPS.

NGTS-EB-7, an eccentric, long-period, low-mass eclipsing binary (2024)
Journal Article
Rodel, T., Watson, C. A., Ulmer-Moll, S., Gill, S., Maxted, P. F. L., Casewell, S. L., Brahm, R., Wilson, T. G., Costes, J. C., Eschen, Y. N. E., Doyle, L., Freckelton, A. V., Alves, D. R., Apergis, I., Bayliss, D., Bouchy, F., Burleigh, M. R., Dumusque, X., Eberhardt, J., Fernández, J. F., …Wheatley, P. J. (in press). NGTS-EB-7, an eccentric, long-period, low-mass eclipsing binary. Monthly Notices of the Royal Astronomical Society, 1-22. https://doi.org/10.1093/mnras/stae2799

Despite being the most common types of stars in the Galaxy, the physical properties of late M dwarfs are often poorly constrained. A trend of radius inflation compared to evolutionary models has been observed for earlier type M dwarfs in eclipsing bi... Read More about NGTS-EB-7, an eccentric, long-period, low-mass eclipsing binary.

The CHEOPS view of the climate of WASP-3 b (2024)
Journal Article
Scandariato, G., Carone, L., Cubillos, P. E., Maxted, P. F. L., Zingales, T., Günther, M. N., Heitzmann, A., Lendl, M., Wilson, T. G., Bonfanti, A., Bruno, G., Krenn, A., Meier Valdes, E., Singh, V., Swayne, M. I., Alibert, Y., Alonso, R., Bárczy, T., Barrado Navascues, D., Barros, S. C. C., …Walton, N. A. (2024). The CHEOPS view of the climate of WASP-3 b. Astronomy & Astrophysics, 692, Article A129. https://doi.org/10.1051/0004-6361/202451049

Abstract

Context. Hot Jupiters are giant planets subject to intense stellar radiation. The physical and chemical properties of their atmosphere make them the most amenable targets for atmospheric characterization.

Aims. In this paper we analyze... Read More about The CHEOPS view of the climate of WASP-3 b.

A possible misaligned orbit for the young planet AU Mic c (2024)
Journal Article
Yu, H., Garai, Z., Cretignier, M., Szabó, G. M., Aigrain, S., Gandolfi, D., Bryant, E. M., Correia, A. C. M., Klein, B., Brandeker, A., Owen, J. E., Günther, M. N., Winn, J. N., Heitzmann, A., Cegla, H. M., Wilson, T. G., Gill, S., Kriskovics, L., Barragán, O., Boldog, A., …Wheatley, P. J. (in press). A possible misaligned orbit for the young planet AU Mic c. Monthly Notices of the Royal Astronomical Society, 18. https://doi.org/10.1093/mnras/stae2655

The AU Microscopii planetary system is only 24 Myr old, and its geometry may provide clues about the early dynamical history of planetary systems. Here, we present the first measurement of the Rossiter-McLaughlin effect for the warm sub-Neptune AU Mi... Read More about A possible misaligned orbit for the young planet AU Mic c.

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., Florén, H. .-G., Sousa, S. G., Maxted, P. F. L., Nardiello, D., Malavolta, L., Wilson, T. G., Alibert, Y., Adibekyan, V., Bonfanti, A., Luque, R., Santos, N. C., Hooton, M. J., Fossati, L., Smith, A. M. S., …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., Heitzmann, A., Mantovan, G., Luque, R., Zingales, T., Piotto, G., Alibert, Y., Alonso, R., Bárczy, T., Barrado Navascues, D., Barros, S. C. C., Baumjohann, W., Beck, T., Benz, W., Billot, N., …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., Stassun, K. G., Gaudi, B. S., Gill, S., Sebastian, D., & 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., Coleman, G. A. L., Davis, Y. T., Deleuil, M., Hébrard, G., Martin, D. V., Maxted, P. F. L., Nelson, R. P., Sebastian, D., Scutt, O. 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 $&gt; 90~{{\%}}$ 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.

HR 10 as seen by CHEOPS and TESS: Revealing δ Scuti pulsations, granulation-like signal and hint for transients (2024)
Journal Article
Salmon, S. J. A. J., Van Grootel, V., Sulis, S., Szabó, G. M., Brandeker, A., Broeg, C., Ehrenreich, D., Hoyer, S., Sousa, S. G., Kiefer, F., Gandolfi, D., Nardiello, D., Charpinet, S., Bonfanti, A., Wilson, T. G., Alibert, Y., Alonso, R., Anglada, G., Bárczy, T., Barrado Navascues, D., …Walton, N. A. (2024). HR 10 as seen by CHEOPS and TESS: Revealing δ Scuti pulsations, granulation-like signal and hint for transients. Astronomy & Astrophysics, 690, 1-18. https://doi.org/10.1051/0004-6361/202346180

Context. HR 10 has only recently been identified as a binary system. Previously thought to be an A-type shell star, it appears that both components are fast-rotating A-type stars, each presenting a circumstellar envelope. Although showing complex pho... Read More about HR 10 as seen by CHEOPS and TESS: Revealing δ Scuti pulsations, granulation-like signal and hint for transients.

Characterisation of the warm-Jupiter TOI-1130 system with CHEOPS and a photo-dynamical approach (2024)
Journal Article
Borsato, L., Degen, D., Leleu, A., Hooton, M. J., Egger, J. A., Bekkelien, A., Brandeker, A., Collier Cameron, A., Günther, M. N., Nascimbeni, V., Persson, C. M., Bonfanti, A., Wilson, T. G., Correia, A. C. M., Zingales, T., Guillot, T., Triaud, A. H. M. J., Piotto, G., Gandolfi, D., Abe, L., …Wolter, D. (2024). Characterisation of the warm-Jupiter TOI-1130 system with CHEOPS and a photo-dynamical approach. Astronomy & Astrophysics, 689, 1-21. https://doi.org/10.1051/0004-6361/202450974

Context. Among the thousands of exoplanets discovered to date, approximately a few hundred gas giants on short-period orbits are classified as ‘lonely’ and only a few are in a multi-planet system with a smaller companion on a close orbit. The process... Read More about Characterisation of the warm-Jupiter TOI-1130 system with CHEOPS and a photo-dynamical approach.

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., Lendl, M., Brandeker, A., Heitzmann, A., Leleu, A., Damasso, M., Bonfanti, A., Wilson, T. G., Sousa, S. G., Haldemann, J., Delrez, L., Hooton, M. J., Zingales, T., Luque, R., Alonso, R., …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., Hara, N., Wilson, T. G., Billot, N., Lendl, M., Ehrenreich, D., Chakraborty, H., Günther, M. N., Hooton, M. J., Alibert, Y., Alonso, R., Alves, D. R., Anderson, D. R., Apergis, I., Armstrong, D., …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.

In-situ observations of resident space objects with the CHEOPS space telescope (2024)
Journal Article
Billot, N., Hellmich, S., Benz, W., Fortier, A., Ehrenreich, D., Broeg, C., Heitzmann, A., Bekkelien, A., Brandeker, A., Alibert, Y., Alonso, R., Bárczy, T., Barrado Navascues, D., Barros, S. C., Baumjohann, W., Biondi, F., Borsato, L., Collier Cameron, A., Corral van Damme, C., Correia, A. C., …Wilson, T. G. (2024). In-situ observations of resident space objects with the CHEOPS space telescope. Journal of Space Safety Engineering, 11(3), 498-506. https://doi.org/10.1016/j.jsse.2024.08.005

The CHaracterising ExOPlanet Satellite (CHEOPS) is a partnership between the European Space Agency and Switzerland with important contributions by 10 additional ESA member States. It is the first S-class mission in the ESA Science Programme. CHEOPS h... Read More about In-situ observations of resident space objects with the CHEOPS space telescope.