Outputs (183)

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.

Connecting photometric and spectroscopic granulation signals with CHEOPS and ESPRESSO (2023)
Journal Article
Maxted. (2023). Connecting photometric and spectroscopic granulation signals with CHEOPS and ESPRESSO. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/202244223

Context. Stellar granulation generates fluctuations in photometric and spectroscopic data whose properties depend on the stellar type, composition, and evolutionary state. Characterizing granulation is key for understanding stellar atmospheres and de... Read More about Connecting photometric and spectroscopic granulation signals with CHEOPS and ESPRESSO.

Examining the orbital decay targets KELT-9 b, KELT-16 b, and WASP-4 b, and the transit-timing variations of HD 97658 b (2023)
Journal Article
Maxted, P., & Hellier, C. (2023). Examining the orbital decay targets KELT-9 b, KELT-16 b, and WASP-4 b, and the transit-timing variations of HD 97658 b. Astronomy & Astrophysics, 669, Article A124. https://doi.org/10.1051/0004-6361/202244529

Context. Tidal orbital decay is suspected to occur for hot Jupiters in particular, with the only observationally confirmed case of this being WASP-12b. By examining this effect, information on the properties of the host star can be obtained using the... Read More about Examining the orbital decay targets KELT-9 b, KELT-16 b, and WASP-4 b, and the transit-timing variations of HD 97658 b.

55 Cancri e's occultation captured with CHEOPS (2023)
Journal Article
Matthews, P., Demory, B., Sulis, S., Valdes, E., Brandeker, A., Billot, N., …Walton, N. (2023). 55 Cancri e's occultation captured with CHEOPS. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/202244894

Past occultation and phase-curve observations of the ultra-short period super-Earth 55 Cnc e obtained at visible and infrared wavelengths have been challenging to reconcile with a planetary reflection and emission model. In this study, we analyse a s... Read More about 55 Cancri e's occultation captured with CHEOPS.

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.

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.

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.

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.