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Validation of TOI-1221 b: A Warm Sub-Neptune Exhibiting Transit Timing Variations around a Sun-like Star (2023)
Journal Article
Mann, C., Lafreniere, D., Dragomir, D., Quinn, S. N., Tan, T., Collins, K. A., …Schwarz, R. P. (2023). Validation of TOI-1221 b: A Warm Sub-Neptune Exhibiting Transit Timing Variations around a Sun-like Star. Astronomical Journal, 165(5), Article 217. https://doi.org/10.3847/1538-3881/acc8d4

We present a validation of a long-period (91.68278 (+0.00032)(-0.00041) days) transiting sub-Neptune planet, TOI-1221 b (TIC 349095149.01), around a Sun-like (m(V)= 10.5) star. This is one of the few known exoplanets with a period >50 days, and belon... Read More about Validation of TOI-1221 b: A Warm Sub-Neptune Exhibiting Transit Timing Variations around a Sun-like Star.

The young mini-Neptune HD 207496b that is either a naked core or on the verge of becoming one (2023)
Journal Article
Barros, S. C. C., Demangeon, O. D. S., Armstrong, D. J., Mena, E. D., Acuna, L., Fernandez, J. F., …Winn, J. N. (2023). The young mini-Neptune HD 207496b that is either a naked core or on the verge of becoming one. Astronomy & Astrophysics, 673, Article A4. https://doi.org/10.1051/0004-6361/202245741

Aims.
We report the discovery and characterisation of the transiting mini-Neptune HD 207496 b (TOI-1099) as part of a large programme that aims to characterise naked core planets.

Methods.
We obtained HARPS spectroscopic observations, one grou... Read More about The young mini-Neptune HD 207496b that is either a naked core or on the verge of becoming one.

Infrared spectroscopy of the 2022 eruption of the recurrent nova U Sco (2023)
Journal Article
Evans, A., Banerjee, D. P. K., Woodward, C. E., Geballe, T. R., Gehrz, R. D., Page, K. L., & Starrfield, S. (2023). Infrared spectroscopy of the 2022 eruption of the recurrent nova U Sco. Monthly Notices of the Royal Astronomical Society, 522(4), 4841-4851. https://doi.org/10.1093/mnras/stad1209

We present near-infrared spectroscopy of the 2022 eruption of the recurrent nova U Sco, over the period from 5.2 to 45.4 days after outburst. This is the most intensive infrared study of this nova. Our observations started early after the outburst an... Read More about Infrared spectroscopy of the 2022 eruption of the recurrent nova U Sco.

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.

High-mass eclipsing binaries: A testbed for models of interior structure and evolution Accurate fundamental properties and surface chemical composition for V1034 Sco, GL Car, V573 Car, and V346 Cen??? (2023)
Journal Article
Pavlovski, K., Southworth, J., Tkachenko, A., Van Reeth, T., & Tamajo, E. (2023). High-mass eclipsing binaries: A testbed for models of interior structure and evolution Accurate fundamental properties and surface chemical composition for V1034 Sco, GL Car, V573 Car, and V346 Cen???. Astronomy & Astrophysics, 671, Article A139. https://doi.org/10.1051/0004-6361/202244980

Aims: The surface chemical compositions of stars are affected by physical processes that bring the products of thermonuclear burning to the surface. Despite their potential in helping us understand the structure and evolution of stars, elemental abun... Read More about High-mass eclipsing binaries: A testbed for models of interior structure and evolution Accurate fundamental properties and surface chemical composition for V1034 Sco, GL Car, V573 Car, and V346 Cen???.

Tidally perturbed gravity-mode pulsations in a sample of close eclipsing binaries (2023)
Journal Article
Van Reeth, T., Johnston, C., Southworth, J., Fuller, J., Bowman, D., Poniatowski, L., & Van Beeck, J. (2023). Tidally perturbed gravity-mode pulsations in a sample of close eclipsing binaries. Astronomy & Astrophysics, 671, Article A121. https://doi.org/10.1051/0004-6361/202245460

Context. Thanks to the high-precision photometry from space missions such as Kepler and TESS, tidal perturbations and tilting of pulsations have been detected in more than a dozen binary systems. However, only two of these were gravity-mode (g-mode)... Read More about Tidally perturbed gravity-mode pulsations in a sample of close eclipsing binaries.

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.

The TESS Grand Unified Hot Jupiter Survey. II. Twenty New Giant Planets* (2023)
Journal Article
Hellier. (2023). The TESS Grand Unified Hot Jupiter Survey. II. Twenty New Giant Planets*. Astrophysical Journal Supplement, https://doi.org/10.3847/1538-4365/aca286

NASA's Transiting Exoplanet Survey Satellite (TESS) mission promises to improve our understanding of hot Jupiters by providing an all-sky, magnitude-limited sample of transiting hot Jupiters suitable for population studies. Assembling such a sample r... Read More about The TESS Grand Unified Hot Jupiter Survey. II. Twenty New Giant Planets*.

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.

TOI-4562b: A Highly Eccentric Temperate Jupiter Analog Orbiting a Young Field Star (2023)
Journal Article
Hellier. (2023). TOI-4562b: A Highly Eccentric Temperate Jupiter Analog Orbiting a Young Field Star. Astronomical Journal, https://doi.org/10.3847/1538-3881/acb5a2

We report the discovery of TOI-4562b (TIC-349576261), a Jovian planet orbiting a young F7V-type star, younger than the Praesepe/Hyades clusters (<700 Myr). This planet stands out because of its unusually long orbital period for transiting planets wit...

The Gaia-ESO Survey: Preparing the ground for 4MOST and WEAVE galactic surveys (2023)
Journal Article
Nepal, S., Guiglion, G., de Jong, R., Valentini, M., Chiappini, C., Steinmetz, M., …Zaggia, S. (2023). The Gaia-ESO Survey: Preparing the ground for 4MOST and WEAVE galactic surveys. Astronomy & Astrophysics, 671, Article A61. https://doi.org/10.1051/0004-6361/202244765

Context. Originating from several sources (Big Bang, stars, cosmic rays) and being strongly depleted during stellar lifetime, the lithium element is of great interest as its chemical evolution in the Milky Way is not yet well understood. To help cons... Read More about The Gaia-ESO Survey: Preparing the ground for 4MOST and WEAVE galactic surveys.

A precise blue-optical transmission spectrum from the ground: evidence for haze in the atmosphere of WASP-74b (2023)
Journal Article
Spyratos, P., Nikolov, N. K., Constantinou, S., Southworth, J., Madhusudhan, N., Sedaghati, E., …Mancini, L. (2023). A precise blue-optical transmission spectrum from the ground: evidence for haze in the atmosphere of WASP-74b. Monthly Notices of the Royal Astronomical Society, 521(2), 2163 - 2180. https://doi.org/10.1093/mnras/stad637

We report transmission spectroscopy of the bloated hot Jupiter WASP-74b in the wavelength range from 4000 to 6200 Å. We observe two transit events with the Very Large Telescope (VLT) Focal Reducer and Spectrograph and present a new method to measure... Read More about A precise blue-optical transmission spectrum from the ground: evidence for haze in the atmosphere of WASP-74b.

On ρ-conjugate Hopf–Galois structures (2023)
Journal Article
Truman. (2023). On ρ-conjugate Hopf–Galois structures. Proceedings of the Edinburgh Mathematical Society, 66(1), 288-304. https://doi.org/10.1017/S0013091523000184

The Hopf-Galois structures admitted by a Galois extension of fields $ L/K $ with Galois group $ G $ correspond bijectively with certain subgroups of $ \mathrm{Perm}(G) $. We use a natural partition of the set of such subgroups to obtain a method for... Read More about On ρ-conjugate Hopf–Galois structures.

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.

H I filaments as potential compass needles? Comparing the magnetic field structure of the Small Magellanic Cloud to the orientation of GASKAP-H I filaments (2023)
Journal Article
Van Loon, J. T., Ma, Y. K., McClure-Griffiths, N. M., Clark, S. E., Gibson, S. J., Soler, J. D., …Pingel, N. M. (2023). H I filaments as potential compass needles? Comparing the magnetic field structure of the Small Magellanic Cloud to the orientation of GASKAP-H I filaments. Monthly Notices of the Royal Astronomical Society, 521(1), 60 - 83. https://doi.org/10.1093/mnras/stad462

High-spatial-resolution H i observations have led to the realization that the nearby (within few hundreds of parsecs) Galactic atomic filamentary structures are aligned with the ambient magnetic field. Enabled by the high-quality data from the Austra... Read More about H I filaments as potential compass needles? Comparing the magnetic field structure of the Small Magellanic Cloud to the orientation of GASKAP-H I filaments.

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.

TOI-1075 b: A Dense, Massive, Ultra-short-period Hot Super-Earth Straddling the Radius Gap (2023)
Journal Article
Hellier. (2023). TOI-1075 b: A Dense, Massive, Ultra-short-period Hot Super-Earth Straddling the Radius Gap. Astronomical Journal, https://doi.org/10.3847/1538-3881/ac9c5b

Populating the exoplanet mass–radius diagram in order to identify the underlying relationship that governs planet composition is driving an interdisciplinary effort within the exoplanet community. The discovery of hot super-Earths—a high-temperature,... Read More about TOI-1075 b: A Dense, Massive, Ultra-short-period Hot Super-Earth Straddling the Radius Gap.

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.