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Pierre Maxted's Outputs (23)

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.

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.

Two warm Neptunes transiting HIP 9618 revealed by <i>TESS</i> and <i>Cheops</i> (2023)
Journal Article
Osborn, H. P., Nowak, G., Hébrard, G., Masseron, T., Lillo-Box, J., Pallé, E., …Winn, J. N. (2023). Two warm Neptunes transiting HIP 9618 revealed by TESS and Cheops. Monthly Notices of the Royal Astronomical Society, 523(2), 3069-3089. https://doi.org/10.1093/mnras/stad1319

HIP 9618 (HD 12572, TOI-1471, TIC 306263608) is a bright (G = 9.0 mag) solar analogue. TESS photometry revealed the star to have two candidate planets with radii of 3.9 ± 0.044 R⊕ (HIP 9618 b) and 3.343 ± 0.039 R⊕ (HIP 9618 c). While the 20.77291 d p... Read More about Two warm Neptunes transiting HIP 9618 revealed by <i>TESS</i> and <i>Cheops</i>.

TESS and CHEOPS discover two warm sub-Neptunes transiting the bright K-dwarf HD 15906 (2023)
Journal Article
Tuson, A., Queloz, D., Osborn, H. P., Wilson, T. G., Hooton, M. J., Beck, M., …Wohler, B. (2023). TESS and CHEOPS discover two warm sub-Neptunes transiting the bright K-dwarf HD 15906. Monthly Notices of the Royal Astronomical Society, 523(2), 3090-3118. https://doi.org/10.1093/mnras/stad1369

We report the discovery of two warm sub-Neptunes transiting the bright (G = 9.5 mag) K-dwarf HD 15906 (TOI 461, TIC 4646810). This star was observed by the Transiting Exoplanet Survey Satellite (TESS) in sectors 4 and 31, revealing two small transiti... Read More about TESS and CHEOPS discover two warm sub-Neptunes transiting the bright K-dwarf HD 15906.

A full transit of nu(2) Lupi d and the search for an exomoon in its Hill sphere with CHEOPS (2023)
Journal Article
Ehrenreich, D., Delrez, L., Akinsanmi, B., Wilson, T. G., Bonfanti, A., Beck, M., …Walton, N. A. (2023). A full transit of nu(2) Lupi d and the search for an exomoon in its Hill sphere with CHEOPS. Astronomy & Astrophysics, 671, Article A154. https://doi.org/10.1051/0004-6361/202244790

The planetary system around the naked-eye star v(2) Lupi (HD 136352; TOI-2011) is composed of three exoplanets with masses of 4.7, 11.2, and 8.6 Earth masses (M-circle plus). The TESS and CHEOPS missions revealed that all three planets are transiting... Read More about A full transit of nu(2) Lupi d and the search for an exomoon in its Hill sphere with CHEOPS.

Glancing through the debris disk: Photometric analysis of DE Boo with CHEOPS (2023)
Journal Article
Maxted. (2023). Glancing through the debris disk: Photometric analysis of DE Boo with CHEOPS. Astronomy & Astrophysics, 671, Article A127. https://doi.org/10.1051/0004-6361/202245101

DE Boo is a unique system, with an edge-on view through the debris disk around the star. The disk, which is analogous to the Kuiper belt in the Solar System, was reported to extend from 74 to 84 AU from the central star. The high photometric precisio... Read More about Glancing through the debris disk: Photometric analysis of DE Boo with CHEOPS.

Limb darkening measurements from TESS and Kepler light curves of transiting exoplanets (2023)
Journal Article
Maxted. (2023). Limb darkening measurements from TESS and Kepler light curves of transiting exoplanets. Monthly Notices of the Royal Astronomical Society, 3723-3735. https://doi.org/10.1093/mnras/stac3741

Inaccurate limb-darkening models can be a significant source of error in the analysis of the light curves for transiting exoplanet and eclipsing binary star systems. To test the accuracy of published limb-darkening models, I have compared limb-darken... Read More about Limb darkening measurements from TESS and Kepler light curves of transiting exoplanets.

Hint of an exocomet transit in the CHEOPS light curve of HD 172555 (2023)
Journal Article
Maxted. (2023). Hint of an exocomet transit in the CHEOPS light curve of HD 172555. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/202245104

HD 172555 is a young (~20 Myr) A7V star surrounded by a 10 au wide debris disk suspected to be replenished partly by collisions between large planetesimals. Small evaporating transiting bodies, that is exocomets, have also been detected in this syste... Read More about Hint of an exocomet transit in the CHEOPS light curve of HD 172555.

The EBLM project X. benchmark masses, radii and temperatures for two fully convective M-dwarfs using K2 (2023)
Journal Article
Duck, A., Martin, D. V., Gill, S., Armitage, T., Rodríguez Martínez, R., Maxted, P. F. L., …Udry, S. (2023). The EBLM project X. benchmark masses, radii and temperatures for two fully convective M-dwarfs using K2. Monthly Notices of the Royal Astronomical Society, 521(4), 6305-6317. https://doi.org/10.1093/mnras/stad452

M-dwarfs are the most abundant stars in the galaxy and popular targets for exoplanet searches. However, their intrinsic faintness and complex spectra inhibit precise characterisation. We only know of dozens of M-dwarfs with fundamental parameters of... Read More about The EBLM project X. benchmark masses, radii and temperatures for two fully convective M-dwarfs using K2.

Revising the properties of low mass eclipsing binary stars using TESS light curves (2023)
Journal Article
Jennings, Z., Southworth, J., Maxted, P. F. L., & Mancini, L. (2023). Revising the properties of low mass eclipsing binary stars using TESS light curves. Monthly Notices of the Royal Astronomical Society, 521(3), 3405-3420. https://doi.org/10.1093/mnras/stad519

Precise measurements of stellar parameters are required in order to develop our theoretical understanding of stellar structure. These measurements enable errors and uncertainties to be quantified in theoretical models and constrain the physical inter... Read More about Revising the properties of low mass eclipsing binary stars using TESS light curves.

TOI-836: A super-Earth and mini-Neptune transiting a nearby K-dwarf (2023)
Journal Article
Hawthorn, F., Bayliss, D., Wilson, T. G., Bonfanti, A., Adibekyan, V., Alibert, Y., …Zhang, H. (2023). TOI-836: A super-Earth and mini-Neptune transiting a nearby K-dwarf. Monthly Notices of the Royal Astronomical Society, 520(3), 3649 - 3668. https://doi.org/10.1093/mnras/stad306

We present the discovery of two exoplanets transiting TOI-836 (TIC 440887364) using data from TESS Sector 11 and Sector 38. TOI-836 is a bright (T = 8.5?mag), high proper motion (~200?mas?yr-1), low metallicity ([Fe/H]˜-0.28) K-dwarf with a mass of 0... Read More about TOI-836: A super-Earth and mini-Neptune transiting a nearby K-dwarf.