All Outputs (25)

Phase curve and geometric albedo of WASP-43b measured with CHEOPS, TESS, and HST WFC3/UVIS (2022)
Journal Article
Maxted. (2022). Phase curve and geometric albedo of WASP-43b measured with CHEOPS, TESS, and HST WFC3/UVIS. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/202243974

Context. Observations of the phase curves and secondary eclipses of extrasolar planets provide a window onto the composition and thermal structure of the planetary atmospheres. For example, the photometric observations of secondary eclipses lead to t... Read More about Phase curve and geometric albedo of WASP-43b measured with CHEOPS, TESS, and HST WFC3/UVIS.

CHEOPS finds KELT-1b darker than expected in visible light: Discrepancy between the CHEOPS and TESS eclipse depths (2022)
Journal Article
Parviainen, H., Wilson, T. G., Lendl, M., Kitzmann, D., Pallé, E., Serrano, L. M., …Walton, N. A. (2022). CHEOPS finds KELT-1b darker than expected in visible light: Discrepancy between the CHEOPS and TESS eclipse depths. Astronomy & Astrophysics, 668, Article A93. https://doi.org/10.1051/0004-6361/202244117

Recent studies based on photometry from the Transiting Exoplanet Survey Satellite (TESS) have suggested that the dayside of KELT-1b, a strongly irradiated brown dwarf, is significantly brighter in visible light than what would be expected based on Sp... Read More about CHEOPS finds KELT-1b darker than expected in visible light: Discrepancy between the CHEOPS and TESS eclipse depths.

Discovery of TOI-1260d and the characterization of the multiplanet system (2022)
Journal Article
Lam, K. W. F., Cabrera, J., Hooton, M. J., Alibert, Y., Bonfanti, A., Beck, M., …Winn., J. N. (2023). Discovery of TOI-1260d and the characterization of the multiplanet system. Monthly Notices of the Royal Astronomical Society, 519(1), 1437 - 1451. https://doi.org/10.1093/mnras/stac3639

We report the discovery of a third planet transiting the star TOI-1260, previously known to host two transiting sub-Neptune planets with orbital periods of 3.127 and 7.493 d, respectively. The nature of the third transiting planet with a 16.6-d orbit... Read More about Discovery of TOI-1260d and the characterization of the multiplanet system.

A CHEOPS-enhanced view of the HD 3167 system (2022)
Journal Article
Maxted. (2022). A CHEOPS-enhanced view of the HD 3167 system. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/202243778

Much remains to be understood about the nature of exoplanets smaller than Neptune, most of which have been discovered in compact multi-planet systems. With its inner ultra-short period planet b aligned with the star and two larger outer planets d-c o... Read More about A CHEOPS-enhanced view of the HD 3167 system.

Characterization of the HD 108236 system with CHEOPS and TESS Confirmation of a fifth transiting planet (2022)
Journal Article
Maxted. (2022). Characterization of the HD 108236 system with CHEOPS and TESS Confirmation of a fifth transiting planet. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/202243720

Context. The HD 108236 system was first announced with the detection of four small planets based on TESS data. Shortly after, the transit of an additional planet with a period of 29.54 d was serendipitously detected by CHEOPS. In this way, HD 108236... Read More about Characterization of the HD 108236 system with CHEOPS and TESS Confirmation of a fifth transiting planet.

The HD 93963 A transiting system: A 1.04d super-Earth and a 3.65 d sub-Neptune discovered by TESS and CHEOPS (2022)
Journal Article
Maxted. (2022). The HD 93963 A transiting system: A 1.04d super-Earth and a 3.65 d sub-Neptune discovered by TESS and CHEOPS. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/202243093

We present the discovery of two small planets transiting HD 93963A (TOI-1797), a GOV star (M* = 1.109 ± 0.043M?, R* = 1.043 ± 0.009 R?) in a visual binary system. We combined TESS and CHEOPS space-borne photometry with MuSCAT 2 ground-based photometr... Read More about The HD 93963 A transiting system: A 1.04d super-Earth and a 3.65 d sub-Neptune discovered by TESS and CHEOPS.

Fundamental effective temperature measurements for eclipsing binary stars – II. The detached F-type eclipsing binary CPD-54 810 (2022)
Journal Article
Miller, N. J., Maxted, P. F. L., Graczyk, D., Tan, T. G., & Southworth, J. (2022). Fundamental effective temperature measurements for eclipsing binary stars – II. The detached F-type eclipsing binary CPD-54 810. Monthly Notices of the Royal Astronomical Society, 517(4), 5129-5143. https://doi.org/10.1093/mnras/stac2968

CPD-54 810 is a double-lined detached eclipsing binary containing two mid-F type dwarfs on an eccentric 26-d orbit. We perform a combined analysis of the extensive photometry obtained by the TESS space mission along with previously published observat... Read More about Fundamental effective temperature measurements for eclipsing binary stars – II. The detached F-type eclipsing binary CPD-54 810.

The stable climate of KELT-9b (2022)
Journal Article
Jones, K., Morris, B., Demory, B., Ehrenreich, D., Hoyer, S., Simon, A., …Jungo, W. (2022). The stable climate of KELT-9b. Astronomy & Astrophysics, 666, Article A118. https://doi.org/10.1051/0004-6361/202243823

Even among the most irradiated gas giants, so-called ultra-hot Jupiters, KELT-9b stands out as the hottest planet thus far discovered with a dayside temperature of over 4500 K. At these extreme irradiation levels, we expect an increase in heat redist... Read More about The stable climate of KELT-9b.

Surface brightness-colour relations of dwarf stars from detached eclipsing binaries I. Calibrating sample (2022)
Journal Article
Graczyk, D., Pietrzynski, G., Galan, C., Southworth, J., Gieren, W., Kaluszynski, M., …Wielgorski, P. (2022). Surface brightness-colour relations of dwarf stars from detached eclipsing binaries I. Calibrating sample. Astronomy & Astrophysics, 666, 1-17. https://doi.org/10.1051/0004-6361/202244122

Aims. Surface brightness – colour relations (SBCRs) are very useful tools for predicting the angular diameters of stars. They offer the possibility to calculate very precise spectrophotometric distances by the eclipsing binary method or the Baade-Wes... Read More about Surface brightness-colour relations of dwarf stars from detached eclipsing binaries I. Calibrating sample.

Stellar limb darkening A new MPS-ATLAS library for Kepler, TESS, CHEOPS, and PLATO passbands (2022)
Journal Article
Maxted. (2022). Stellar limb darkening A new MPS-ATLAS library for Kepler, TESS, CHEOPS, and PLATO passbands. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/202243722

Context. The detection of the first exoplanet paved the way for the era of transit-photometry space missions with revolutionary photometric precision, whose aim is to discover new exoplanetary systems around different types of stars. With this high p... Read More about Stellar limb darkening A new MPS-ATLAS library for Kepler, TESS, CHEOPS, and PLATO passbands.

The EBLM project – IX. Five fully convective M-dwarfs, precisely measured with CHEOPS and TESS light curves (2022)
Journal Article
Maxted. (2022). The EBLM project – IX. Five fully convective M-dwarfs, precisely measured with CHEOPS and TESS light curves. Monthly Notices of the Royal Astronomical Society, 519(3), 3546–3563. https://doi.org/10.1093/mnras/stac2565

Eclipsing binaries are important benchmark objects to test and calibrate stellar structure and evolution models. This is especially true for binaries with a fully convective M-dwarf component for which direct measurements of these stars' masses and r... Read More about The EBLM project – IX. Five fully convective M-dwarfs, precisely measured with CHEOPS and TESS light curves.

A stellar occultation by the transneptunian object (50000) Quaoar observed by CHEOPS (2022)
Journal Article
Maxted. (2022). A stellar occultation by the transneptunian object (50000) Quaoar observed by CHEOPS. Astronomy & Astrophysics, 1 - 9. https://doi.org/10.1051/0004-6361/202244221

Context. Stellar occultation is a powerful technique that allows the determination of some physical parameters of the occulting object. The result depends on the photometric accuracy, the temporal resolution, and the number of chords obtained. Space... Read More about A stellar occultation by the transneptunian object (50000) Quaoar observed by CHEOPS.

Uncovering the true periods of the young sub-Neptunes orbiting TOI-2076 (2022)
Journal Article
Maxted. (2022). Uncovering the true periods of the young sub-Neptunes orbiting TOI-2076. Astronomy & Astrophysics, A156 - A156. https://doi.org/10.1051/0004-6361/202243065

Context. TOI-2076 is a transiting three-planet system of sub-Neptunes orbiting a bright (G = 8.9 mag), young (340 ± 80 Myr) K-type star. Although a validated planetary system, the orbits of the two outer planets were unconstrained as only two non-con... Read More about Uncovering the true periods of the young sub-Neptunes orbiting TOI-2076.

Fundamental effective temperature measurements for eclipsing binary stars – III. SPIRou near-infrared spectroscopy and CHEOPS photometry of the benchmark G0V star EBLM J0113+31 (2022)
Journal Article
Maxted, P. F. L., Miller, N. J., Hoyer, S., Adibekyan, V., Sousa, S. G., Billot, N., …Walton, N. (2022). Fundamental effective temperature measurements for eclipsing binary stars – III. SPIRou near-infrared spectroscopy and CHEOPS photometry of the benchmark G0V star EBLM J0113+31. Monthly Notices of the Royal Astronomical Society, 513(4), 6042-6057. https://doi.org/10.1093/mnras/stac1270

EBLM J0113+31 is a moderately bright (V = 10.1), metal-poor ([Fe/H] approximate to-0.3) GOV star with a much fainter M dwarf companion on a wide, eccentric orbit (= 14.3 d). We have used near-infrared spectroscopy obtained with the SPIRou spectrograp... Read More about Fundamental effective temperature measurements for eclipsing binary stars – III. SPIRou near-infrared spectroscopy and CHEOPS photometry of the benchmark G0V star EBLM J0113+31.

Six new compact triply eclipsing triples found with TESS (2022)
Journal Article
Maxted, P. F. L., Rappaport, S. A., Borkovits, T., Gagliano, R., Jacobs, T. L., Kostov, V. B., …Stevens, D. J. (2022). Six new compact triply eclipsing triples found with TESS. Monthly Notices of the Royal Astronomical Society, 513(3), 4341-4360. https://doi.org/10.1093/mnras/stac957

In this work, we report the discovery and analysis of six new compact triply eclipsing triple star systems found with the TESS mission: TICs 37743815, 42565581, 54060695, 178010808, 242132789, and 456194776. All of these exhibit distinct third-body e... Read More about Six new compact triply eclipsing triples found with TESS.

Transit timing variations of AU Microscopii b and c* (2022)
Journal Article
Maxted. (2022). Transit timing variations of AU Microscopii b and c*. Astronomy & Astrophysics,

Here we report large-amplitude transit timing variations (TTVs) for AU Microcopii b and c as detected in combined TESS (2018, 2020) and CHEOPS (2020, 2021) transit observations. AU Mic is a young planetary system with a debris disk and two transiting... Read More about Transit timing variations of AU Microscopii b and c*.

The atmosphere and architecture of WASP-189 b probed by its CHEOPS phase curve (2022)
Journal Article
Maxted. (2022). The atmosphere and architecture of WASP-189 b probed by its CHEOPS phase curve. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/202142400

Context. Gas giants orbiting close to hot and massive early-type stars can reach dayside temperatures that are comparable to those of the coldest stars. These 'ultra-hot Jupiters' have atmospheres made of ions and atomic species from molecular dissoc... Read More about The atmosphere and architecture of WASP-189 b probed by its CHEOPS phase curve.

CHEOPS geometric albedo of the hot Jupiter HD 209458 b (2022)
Journal Article
Maxted. (2022). CHEOPS geometric albedo of the hot Jupiter HD 209458 b. Astronomy & Astrophysics, L4 - L4. https://doi.org/10.1051/0004-6361/202243082

We report the detection of the secondary eclipse of the hot Jupiter HD 209458 b in optical/visible light using the CHEOPS space telescope. Our measurement of 20.4(-3.3)(+3.2) parts per million translates into a geometric albedo of A(g) = 0.096 +/- 0.... Read More about CHEOPS geometric albedo of the hot Jupiter HD 209458 b.

Investigating the architecture and internal structure of the TOI-561 system planets with CHEOPS, HARPS-N, and TESS (2022)
Journal Article
Maxted. (2022). Investigating the architecture and internal structure of the TOI-561 system planets with CHEOPS, HARPS-N, and TESS. Monthly Notices of the Royal Astronomical Society, 4551 - 4571. https://doi.org/10.1093/mnras/stac199

We present a precise characterization of the TOI-561 planetary system obtained by combining previously published data with TESS and CHEOPS photometry, and a new set of 62 HARPS-N radial velocities (RVs). Our joint analysis confirms the presence of fo... Read More about Investigating the architecture and internal structure of the TOI-561 system planets with CHEOPS, HARPS-N, and TESS.

BEBOP III. Observations and an independent mass measurement of Kepler-16 (AB) b - the first circumbinary planet detected with radial velocities (2022)
Journal Article
Maxted, P. F. L., Triaud, A. H. M. J., Standing, M. R., Heidari, N., Martin, D. V., Boisse, I., …Willett, E. (2022). BEBOP III. Observations and an independent mass measurement of Kepler-16 (AB) b - the first circumbinary planet detected with radial velocities. Monthly Notices of the Royal Astronomical Society, 511(3), 3561-3570. https://doi.org/10.1093/mnras/stab3712

The radial velocity method is amongst the most robust and most established means of detecting exoplanets. Yet, it has so far failed to detect circumbinary planets despite their relatively high occurrence rates. Here, we report velocimetric measuremen... Read More about BEBOP III. Observations and an independent mass measurement of Kepler-16 (AB) b - the first circumbinary planet detected with radial velocities.