The Chandra Cygnus OB2 Legacy Survey: Design and X-Ray Point-source Catalog (2023)
Journal Article
Wright, N. J., Drake, J. J., Guarcello, M. G., Aldcroft, T. L., Kashyap, V. L., Damiani, F., DePasquale, J., & Fruscione, A. (2023). The Chandra Cygnus OB2 Legacy Survey: Design and X-Ray Point-source Catalog. Astrophysical Journal Supplement, 269(1), Article 7. https://doi.org/10.3847/1538-4365/acdd62

The Cygnus OB2 association is the largest concentration of young and massive stars within 2 kpc of the Sun, including an estimated ∼65 O-type stars and hundreds of OB stars. The Chandra Cygnus OB2 Legacy Survey is a large imaging program undertaken w... Read More about The Chandra Cygnus OB2 Legacy Survey: Design and X-Ray Point-source Catalog.

Simulating the Sensitivity to Stellar Point Sources of Chandra X-Ray Observations (2023)
Journal Article
Wright, N. J., Drake, J. J., Guarcello, M. G., Kashyap, V. L., & Zezas, A. (2023). Simulating the Sensitivity to Stellar Point Sources of Chandra X-Ray Observations. Astrophysical Journal Supplement, 269(1), Article 8. https://doi.org/10.3847/1538-4365/acdd63

The Chandra Cygnus OB2 Legacy Survey is a wide and deep X-ray survey of the nearby and massive Cygnus OB2 association. The survey has detected ∼8000 X-ray sources, the majority of which are pre-main-sequence X-ray-emitting young stars in the associat... Read More about Simulating the Sensitivity to Stellar Point Sources of Chandra X-Ray Observations.

A new method for spatially resolving the turbulence driving mixture in the ISM with application to the Small Magellanic Cloud (2023)
Journal Article
Gerrard, I. A., Federrath, C., Pingel, N. M., McClure-Griffiths, N. M., Marchal, A., Joncas, G., Clark, S. E., Stanimirović, S., Lee, M.-Y., van Loon, J. T., Dickey, J., Dénes, H., Ma, Y. K., Dempsey, J., & Lynn, C. (2023). A new method for spatially resolving the turbulence driving mixture in the ISM with application to the Small Magellanic Cloud. Monthly Notices of the Royal Astronomical Society, 526(1), https://doi.org/10.1093/mnras/stad2718

Turbulence plays a crucial role in shaping the structure of the interstellar medium. The ratio of the three-dimensional density contrast ($\sigma _{\rho /\rho _0}$) to the turbulent sonic Mach number ($\mathcal {M}$) of an isothermal, compressible ga... Read More about A new method for spatially resolving the turbulence driving mixture in the ISM with application to the Small Magellanic Cloud.

Three Saturn-mass planets transiting F-type stars revealed with TESS and HARPS: TOI-615b, TOI-622b, and TOI-2641b (2023)
Journal Article
Psaridi, A., Bouchy, F., Lendl, M., Akinsanmi, B., Stassun, K. G., Smalley, B., Armstrong, D. J., Howard, S., Ulmer-Moll, S., Grieves, N., Barkaoui, K., Rodriguez, J. E., Bryant, E. M., Suárez, O., Guillot, T., Evans, P., Attia, O., Wittenmyer, R. A., Yee, S. W., Collins, K. A., …Zapata, A. (2023). Three Saturn-mass planets transiting F-type stars revealed with TESS and HARPS: TOI-615b, TOI-622b, and TOI-2641b. Astronomy & Astrophysics, 675, A39. https://doi.org/10.1051/0004-6361/202346406

While the sample of confirmed exoplanets continues to grow, the population of transiting exoplanets around early-type stars is still limited. These planets allow us to investigate the planet properties and formation pathways over a wide range of stel... Read More about Three Saturn-mass planets transiting F-type stars revealed with TESS and HARPS: TOI-615b, TOI-622b, and TOI-2641b.

Machine learning identification of massive young stellar objects in Local Group galaxies (2023)
Thesis
Kinson, D. A. Machine learning identification of massive young stellar objects in Local Group galaxies. (Thesis). Keele University. https://keele-repository.worktribe.com/output/515636

This thesis presents the development and implementation of a machine learning classification of massive Young Stellar Objects (YSOs) in two Local Group galaxies, NGC6822 and M33. Using archival near- and far-IR data, point sources in both galaxies ar... Read More about Machine learning identification of massive young stellar objects in Local Group galaxies.

Radio and infrared surveys for active galactic nuclei behind the Magellanic Clouds (2023)
Thesis
Pennock, C. M. Radio and infrared surveys for active galactic nuclei behind the Magellanic Clouds. (Thesis). Keele University. https://keele-repository.worktribe.com/output/515724

I present an analysis of a new 120 deg2 radio continuum image of the Large Magellanic Cloud (LMC) at 888 MHz with a bandwidth of 288 MHz and beam size of 13.′′9×12.′′1, from the Australian Square Kilometre Array Pathfinder (ASKAP). I constructed a ca... Read More about Radio and infrared surveys for active galactic nuclei behind the Magellanic Clouds.

Deciphering the atmospheric properties of hot gas giant exoplanets via ground-based transmission spectroscopy (2023)
Thesis
Spyratos, P. Deciphering the atmospheric properties of hot gas giant exoplanets via ground-based transmission spectroscopy. (Thesis). Keele University. https://keele-repository.worktribe.com/output/518836

Transiting hot gas giant exoplanets are great targets for atmospheric investigations due to their extended atmospheres and their strong obscuring effect on the observed starlight when they pass in front of their host star. Transmission spectroscopy c... Read More about Deciphering the atmospheric properties of hot gas giant exoplanets via ground-based transmission spectroscopy.

Fundamental parameters of very low mass stars in eclipsing binary star systems observed with the CHEOPS satellite (2023)
Thesis
Swayne, M. I. Fundamental parameters of very low mass stars in eclipsing binary star systems observed with the CHEOPS satellite. (Thesis). Keele University. https://keele-repository.worktribe.com/output/518842

Observations of low-mass stars have frequently shown unexpectedly large stellar radii when compared to the predictions from theoretical stellar structure models. This “radius inflation” problem may have consequences not just for stellar science but a... Read More about Fundamental parameters of very low mass stars in eclipsing binary star systems observed with the CHEOPS satellite.

Power-2 limb-darkening coefficients for the uvby, UBVRIJHK, SDSS ugriz, Gaia, Kepler, TESS, and CHEOPS photometric systems II. PHOENIX spherically symmetric stellar atmosphere models. (2023)
Journal Article
Claret, A., & Southworth, J. (2023). Power-2 limb-darkening coefficients for the uvby, UBVRIJHK, SDSS ugriz, Gaia, Kepler, TESS, and CHEOPS photometric systems II. PHOENIX spherically symmetric stellar atmosphere models. Astronomy & Astrophysics, 674, Article A63. https://doi.org/10.1051/0004-6361/202346478

Context. The phenomenon of limb-darkening is relevant to many topics in astrophysics, including the analysis of light curves of eclipsing binaries, optical interferometry, measurement of stellar diameters, line profiles of rotating stars, gravitation... Read More about Power-2 limb-darkening coefficients for the uvby, UBVRIJHK, SDSS ugriz, Gaia, Kepler, TESS, and CHEOPS photometric systems II. PHOENIX spherically symmetric stellar atmosphere models..

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.

Another shipment of six short-period giant planets from TESS (2023)
Journal Article
Rodriguez, J. E., Quinn, S. N., Vanderburg, A., Zhou, G., Eastman, J. D., Thygesen, E., Cale, B., Ciardi, D. R., Reed, P. A., Oelkers, R. J., Collins, K. A., Bieryla, A., Latham, D. W., Gonzales, E. J., Gaudi, B. S., Hellier, C., Jones, M. I., Brahm, R., Sokolovsky, K., Schulte, J., …Zobel, E. (2023). Another shipment of six short-period giant planets from TESS. Monthly Notices of the Royal Astronomical Society, 521(2), 2765-2785. https://doi.org/10.1093/mnras/stad595

We present the discovery and characterization of six short-period, transiting giant planets from NASA's Transiting Exoplanet Survey Satellite (TESS) -- TOI-1811 (TIC 376524552), TOI-2025 (TIC 394050135), TOI-2145 (TIC 88992642), TOI-2152 (TIC 3953932... Read More about Another shipment of six short-period giant planets from TESS.

3D stellar evolution: hydrodynamic simulations of a complete burning phase in a massive star (2023)
Journal Article
Rizzuti, F., Hirschi, R., Arnett, W. D., Georgy, C., Meakin, C., Murphy, A. S., Rauscher, T., & Varma, V. (2023). 3D stellar evolution: hydrodynamic simulations of a complete burning phase in a massive star. Monthly Notices of the Royal Astronomical Society, 523(2), 2317-2328. https://doi.org/10.1093/mnras/stad1572

Our knowledge of stellar evolution is driven by one-dimensional (1D) simulations. 1D models, however, are severely limited by uncertainties on the exact behaviour of many multidimensional phenomena occurring inside stars, affecting their structure an... Read More about 3D stellar evolution: hydrodynamic simulations of a complete burning phase in a massive star.

Kinematics of stellar substructures in the small magellanic cloud (2023)
Journal Article
El Youssoufi, D., Cioni, M.-R. L., Kacharov, N., Bell, C. P. M., Matjevic, G., Bekki, K., de Grijs, R., Ivanov, V. D., & van Loon, J. T. (2023). Kinematics of stellar substructures in the small magellanic cloud. Monthly Notices of the Royal Astronomical Society, 523(1), 347-364. https://doi.org/10.1093/mnras/stad1339

We present a kinematic analysis of the Small Magellanic Cloud using 3700 spectra extracted from the European Southern Observatory archive. We used data from Gaia and near-infrared photometry to select stellar populations and discard Galactic foregrou... Read More about Kinematics of stellar substructures in the small magellanic cloud.

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.-G., Collins, K. A., Howell, S. B., Ziegler, C., Mann, A. W., Stassun, K. G., Kristiansen, M. H., Osborn, H., Boyajian, T., Eisner, N., Hellier, C., Ricker, G. R., Vanderspek, R., Latham, D. W., Seager, S., Winn, J. N., …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., Deleuil, M., Collins, K. A., Howell, S. B., Ziegler, C., Adibekyan, V., Sousa, S. G., Stassun, K. G., Grieves, N., Lillo-Box, J., Hellier, C., Wheatley, P. J., Briceno, C., Collins, K. I., Hawthorn, 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.

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...