Equatorial Enhancement in the Dustiest OH/IR Stars in the Galactic Bulge (2025)
Journal Article
Goldman, S. R., van Loon, J. T., Jones, O. C., Blommaert, J. A. D. L., & Groenewegen, M. A. T. (2025). Equatorial Enhancement in the Dustiest OH/IR Stars in the Galactic Bulge. Astrophysical Journal, 980(2), 191. https://doi.org/10.3847/1538-4357/ada6ad

We have detected the 10 μm silicate feature and the 11.3 μm crystalline forsterite feature in absorption in 21 oxygen-rich asymptotic giant branch stars in the Galactic bulge. The depths of the 10 μm feature indicate highly obscured circumstellar env... Read More about Equatorial Enhancement in the Dustiest OH/IR Stars in the Galactic Bulge.

Star Formation History of the Local Group Dwarf Irregular Galaxy, NGC 6822 (2024)
Journal Article
Khatamsaz, F., Abdollahi, M., Abdollahi, H., Javadi, A., & van Loon, J. T. (in press). Star Formation History of the Local Group Dwarf Irregular Galaxy, NGC 6822. Communications of the Byurakan Astrophysical Observatory, 71(2), 394-397. https://doi.org/10.52526/25792776-24.71.2-394

NGC 6822 is an isolated dwarf irregular galaxy in the local group at a distance of ∼ 490 kpc. In this paper, we present the star formation history (SFH) within a field with a radius of ∼ 3 kpc, beyond the optical body of the galaxy ( ∼ 1.2 kpc). We u... Read More about Star Formation History of the Local Group Dwarf Irregular Galaxy, NGC 6822.

A Deep Dive into Stellar Populations in M33’s Central Region: Near-Infrared Observations and Analysis (2024)
Journal Article
Alizadeh, M., Javadi, A., van Loon, J. T., Abedini, Y., Abdollahi, H., & Seifipour, S. (in press). A Deep Dive into Stellar Populations in M33’s Central Region: Near-Infrared Observations and Analysis. Communications of the Byurakan Astrophysical Observatory, 71(2), 389-393. https://doi.org/10.52526/25792776-24.71.2-389

Data collection was conducted using three cameras on the UK Infrared Telescope (UKIRT) from 2003 to 2007. Throughout three nights in August 2005, the UKIRT Fast-Track Imager (UFTI) made K-band observations. The J and H bands Wide Field Camera (WFCAM)... Read More about A Deep Dive into Stellar Populations in M33’s Central Region: Near-Infrared Observations and Analysis.

Detection of the Long Period Variable Stars of And II Dwarf Satellite galaxy (2024)
Journal Article
Abdollahi, H., Javadi, A., van Loon, J. T., McDonald, I., Abdollahi, M., Saremi, E., …Mahani, H. (in press). Detection of the Long Period Variable Stars of And II Dwarf Satellite galaxy. Communications of the Byurakan Astrophysical Observatory, 71(2), 383-388. https://doi.org/10.52526/25792776-24.71.2-383

We conducted an extensive study of the spheroidal dwarf satellite galaxies around the Andromeda galaxy to produce an extensive catalog of LPV stars. The optical monitoring project consists of 55 dwarf galaxies and four globular clusters that are memb... Read More about Detection of the Long Period Variable Stars of And II Dwarf Satellite galaxy.

Machine Learning Classification of Young Stellar Objects and Evolved Stars in the Magellanic Clouds Using the Probabilistic Random Forest Classifier (2024)
Journal Article
Ghaziasgar, S., Abdollahi, M., Javadi, A., van Loon, J. T., McDonald, I., Oliveira, J., & Khosroshahi, H. G. (in press). Machine Learning Classification of Young Stellar Objects and Evolved Stars in the Magellanic Clouds Using the Probabilistic Random Forest Classifier. Communications of the Byurakan Astrophysical Observatory, 71(2), 377-382. https://doi.org/10.52526/25792776-24.71.2-377

The Magellanic Clouds (MCs) are excellent locations to study stellar dust emission and its contribution to galaxy evolution. Through spectral and photometric classification, MCs can serve as a unique environment for studying stellar evolution and gal... Read More about Machine Learning Classification of Young Stellar Objects and Evolved Stars in the Magellanic Clouds Using the Probabilistic Random Forest Classifier.

Deciphering Galactic Halos: A Detailed Review of Star Formation in NGC 5128 (Cen A) (2024)
Journal Article
Abdollahi, M., Aghdam, S. T., Javadi, A., Hashemi, S. A., van Loon, J. T., Khosroshahi, H., …Saberi, M. (in press). Deciphering Galactic Halos: A Detailed Review of Star Formation in NGC 5128 (Cen A). Communications of the Byurakan Astrophysical Observatory, 71(2), 345-350. https://doi.org/10.52526/25792776-24.71.2-345

NGC 5128 (Centaurus A), the closest giant elliptical galaxy outside the Local Group to the Milky Way, is one of the brightest extragalactic radio sources. It is distinguished by a prominent dust lane and powerful jets, driven by a supermassive black... Read More about Deciphering Galactic Halos: A Detailed Review of Star Formation in NGC 5128 (Cen A).

Stellar Evolution and Convection in 3D Hydrodynamic Simulations of a Complete Burning Phase (2024)
Journal Article
Rizzuti, F., Hirschi, R., Varma, V., Arnett, W. D., Georgy, C., Meakin, C., …Rauscher, T. (2024). Stellar Evolution and Convection in 3D Hydrodynamic Simulations of a Complete Burning Phase. Galaxies, 12(6), 87. https://doi.org/10.3390/galaxies12060087

Our understanding of stellar evolution and nucleosynthesis is limited by the uncertainties coming from the complex multi-dimensional processes in stellar interiors, such as convection and nuclear burning. Three-dimensional stellar models can improve... Read More about Stellar Evolution and Convection in 3D Hydrodynamic Simulations of a Complete Burning Phase.

Near-infrared spectroscopy of the LMC recurrent nova LMCN 1968-12a (2024)
Journal Article
Evans, A., Banerjee, D. P. K., Geballe, T. R., Polin, A., Hsiao, E. Y., Page, K. L., …Starrfield, S. (2024). Near-infrared spectroscopy of the LMC recurrent nova LMCN 1968-12a. Monthly Notices of the Royal Astronomical Society, 536(2), 1710-1717. https://doi.org/10.1093/mnras/stae2711

We have obtained near-infrared (0.80–2.45 $\, \mu$m) spectra of the recurrent nova LMCN 1968-12a on two occasions during its 2024 August eruption. This is the first near-infrared spectroscopy of an extragalactic nova. The initial spectrum, on day 8.4... Read More about Near-infrared spectroscopy of the LMC recurrent nova LMCN 1968-12a.

BEBOP V. Homogeneous stellar analysis of potential circumbinary planet hosts (2024)
Journal Article
Freckelton, A. V., Sebastian, D., Mortier, A., Triaud, A. H. M. J., Maxted, P. F. L., Acuña, L., …Willett, E. (2024). BEBOP V. Homogeneous stellar analysis of potential circumbinary planet hosts. Monthly Notices of the Royal Astronomical Society, 531(4), 4085-4098. https://doi.org/10.1093/mnras/stae1405

Planets orbiting binary systems are relatively unexplored compared to those around single stars. Detections of circumbinary planets and planetary systems offer a first detailed view into our understanding of circumbinary planet formation and dynamica... Read More about BEBOP V. Homogeneous stellar analysis of potential circumbinary planet hosts.

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.

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., …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.

Optical and Infrared Counterparts of the X-Ray Sources Detected in the Chandra Cygnus OB2 Legacy Survey (2023)
Journal Article
Guarcello, M. G., Drake, J. J., Wright, N. J., Naylor, T., Flaccomio, E., Kashyap, V. L., & García-Alvarez, D. (2023). Optical and Infrared Counterparts of the X-Ray Sources Detected in the Chandra Cygnus OB2 Legacy Survey. Astrophysical Journal Supplement, 269(1), 9. https://doi.org/10.3847/1538-4365/acdd64

The young massive OB association Cygnus OB2, in the Cygnus X complex, is the closest (∼1400 pc) star-forming region to the Sun hosting thousands of young low-mass stars and up to 1000 OB stars, among which are some of the most massive stars known in... Read More about Optical and Infrared Counterparts of the X-Ray Sources Detected in the Chandra Cygnus OB2 Legacy Survey.

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., …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., …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.

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.

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..

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., …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., …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. L., Kacharov, N., Bell, C. P. M., Matjevic, G., Bekki, K., …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., 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.