Binarity at LOw Metallicity (BLOeM):. Enhanced multiplicity of early B-type dwarfs and giants at Z=0.2 Zsun (2025)
Journal Article
Villaseñor, J., Sana, H., Mahy, L., Shenar, T., Bodensteiner, J., Britavskiy, N., Lennon, D., Moe, M., Patrick, L., Pawlak, M., Bowman, D., Crowther, P., de Mink, S., Deshmukh, K., Evans, C., Fabry, M., Fouesneau, M., Holgado, G., Langer, N., Maíz Apellaniz, J., …Vink, J. (2025). Binarity at LOw Metallicity (BLOeM):. Enhanced multiplicity of early B-type dwarfs and giants at Z=0.2 Zsun. Astronomy & Astrophysics, 698, https://doi.org/10.1051/0004-6361/202453166

Early B-type stars with initial masses between 8 and 15M are frequently found in multiple systems, as is evidenced by multi-epoch spectroscopic campaigns in the Milky Way and the Large Magellanic Cloud (LMC). Previous studies have shown no strong met... Read More about Binarity at LOw Metallicity (BLOeM):. Enhanced multiplicity of early B-type dwarfs and giants at Z=0.2 Zsun.

Binarity at LOw Metallicity (BLOeM): The multiplicity properties and evolution of BAF-type supergiants (2025)
Journal Article
Patrick, L. R., Lennon, D. J., Najarro, F., Shenar, T., Bodensteiner, J., Sana, H., Crowther, P. A., Britavskiy, N., Langer, N., Schootemeijer, A., Evans, C. J., Mahy, L., Götberg, Y., de Mink, S. E., Schneider, F. R. N., O’Grady, A. J. G., Villaseñor, J. I., Bernini-Peron, M., Bowman, D. M., de Koter, A., …Wang, C. (2025). Binarity at LOw Metallicity (BLOeM): The multiplicity properties and evolution of BAF-type supergiants. Astronomy & Astrophysics, 698(June 2025), Article A39. https://doi.org/10.1051/0004-6361/202452949

Given the uncertain evolutionary status of blue supergiant stars, their multiplicity properties hold vital clues to better understand their origin and evolution. As part of The Binarity at LOw Metallicity (BLOeM) campaign in the Small Magellanic Clou... Read More about Binarity at LOw Metallicity (BLOeM): The multiplicity properties and evolution of BAF-type supergiants.

Binarity at LOw Metallicity (BLOeM): Multiplicity of early B-type supergiants in the Small Magellanic Cloud (2025)
Journal Article
Britavskiy, N., Mahy, L., Lennon, D., Patrick, L., Sana, H., Villaseñor, J., Shenar, T., Bodensteiner, J., Bernini-Peron, M., Berlanas, S., Bowman, D., Crowther, P., de Mink, S., Evans, C., Götberg, Y., Holgado, G., Johnston, C., Keszthelyi, Z., Klencki, J., Langer, N., …Vink, J. (2025). Binarity at LOw Metallicity (BLOeM): Multiplicity of early B-type supergiants in the Small Magellanic Cloud. Astronomy & Astrophysics, 698(May 2025), Article A40. https://doi.org/10.1051/0004-6361/202452963

Context. The blue supergiant (BSG) domain contains a large variety of stars whose past and future evolutionary paths are still highly uncertain. Since binary interaction plays a crucial role in the fate of massive stars, investigating the multiplicit... Read More about Binarity at LOw Metallicity (BLOeM): Multiplicity of early B-type supergiants in the Small Magellanic Cloud.

Binarity at LOw Metallicity (BLOeM): Multiplicity properties of Oe and Be stars (2025)
Journal Article
Bodensteiner, J., Shenar, T., Sana, H., Britavskiy, N., Crowther, P., Langer, N., Lennon, D., Mahy, L., Patrick, L., Villaseñor, J., Abdul-Masih, M., Bowman, D., de Koter, A., de Mink, S., Deshmukh, K., Fabry, M., Gilkis, A., Götberg, Y., Holgado, G., Izzard, R., …Xu, X.-T. (2025). Binarity at LOw Metallicity (BLOeM): Multiplicity properties of Oe and Be stars. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/202452623

Context. Rapidly rotating classical OBe stars have been proposed as the products of binary interactions, and the fraction of Be stars with compact companions implies that at least some are. However, to constrain the interaction physics spinning up th... Read More about Binarity at LOw Metallicity (BLOeM): Multiplicity properties of Oe and Be stars.

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.

The VMC Survey – LI. Classifying extragalactic sources using a probabilistic random forest supervised machine learning algorithm (2025)
Journal Article
Pennock, C. M., van Loon, J. T., Cioni, M.-R. L., Maitra, C., Oliveira, J. M., Craig, J. E. M., Ivanov, V. D., Aird, J., Anih, J. O., Cross, N. J. G., Dresbach, F., de Grijs, R., & Groenewegen, M. A. T. (2025). The VMC Survey – LI. Classifying extragalactic sources using a probabilistic random forest supervised machine learning algorithm. Monthly Notices of the Royal Astronomical Society, 537(2), 1028-1055. https://doi.org/10.1093/mnras/staf080

We used a supervised machine learning algorithm (probabilistic random forest) to classify ∼130 million sources in the VISTA Survey of the Magellanic Clouds (VMC). We used multi-wavelength photometry from optical to far-infrared as features to be trai... Read More about The VMC Survey – LI. Classifying extragalactic sources using a probabilistic random forest supervised machine learning algorithm.

Considerations with stacking absorption spectra: cold H i gas in cirrus region of the Milky Way (2025)
Journal Article
Lynn, C., Marchal, A., McClure-Griffiths, N. M., Miville-Deschênes, M.-A., Murray, C. E., Nguyen, H., Dempsey, J., Teodoro, E. D., van Loon, J. T., Dickey, J. M., Lee, M.-Y., Joncas, G., Ma, Y. K., Pingel, N. M., Stanimirović, S., Kemp, I., Gibson, S., & Dénes, H. (2025). Considerations with stacking absorption spectra: cold H i gas in cirrus region of the Milky Way. Monthly Notices of the Royal Astronomical Society, 536(4), 3538-3553. https://doi.org/10.1093/mnras/stae2818

We use the Milky Way neutral hydrogen (H i) absorption and emission spectra from the Galactic Australian Square Kilometre Array Pathfinder (GASKAP) Phase II Pilot survey along with toy models to investigate the effects of stacking multicomponent spec... Read More about Considerations with stacking absorption spectra: cold H i gas in cirrus region of the Milky Way.

X-Shooting ULLYSES: Massive stars at low metallicity. VII. Stellar and wind properties of B supergiants in the Small Magellanic Cloud (2024)
Journal Article
Bernini-Peron, M., Sander, A., Ramachandran, V., Oskinova, L., Vink, J., Verhamme, O., Najarro, F., Josiek, J., Brands, S., Crowther, P., Gomez-Gonzalez, V., Gormaz-Matamala, A., Hawcroft, C., Kuiper, R., Mahy, L., Marcolino, W., Martins, L., Mehner, A., Parsons, T., Pauli, D., …the XShootU collaboration. (in press). X-Shooting ULLYSES: Massive stars at low metallicity. VII. Stellar and wind properties of B supergiants in the Small Magellanic Cloud. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/202450475

New quasars behind the Magellanic Clouds: II. Spectroscopic confirmation of 136 near-infrared selected candidates (2024)
Journal Article
Ivanov, V. D., Cioni, M.-R. L., Dennefeld, M., de Grijs, R., Craig, J. E. M., van Loon, J. T., Pennock, C. M., Maitra, C., & Haberl, F. (2024). New quasars behind the Magellanic Clouds: II. Spectroscopic confirmation of 136 near-infrared selected candidates. Astronomy & Astrophysics, 687, Article A16. https://doi.org/10.1051/0004-6361/202346504

Context. Quasi-stellar objects (QSOs) are a basis for an absolute reference system for astrometric studies. A system like this at the far side of nearby galaxies is required to facilitate measuring of the proper motions of these galaxies. However, th... Read More about New quasars behind the Magellanic Clouds: II. Spectroscopic confirmation of 136 near-infrared selected candidates.

A Galactic Eclipse: The Small Magellanic Cloud Is Forming Stars in Two Superimposed Systems (2024)
Journal Article
Murray, C. E., Hasselquist, S., Peek, J. E. G., Lindberg, C. W., Almeida, A., Choi, Y., Craig, J. E. M., Dénes, H., Dickey, J. M., Di Teodoro, E. M., Federrath, C., Gerrard, I. A., Gibson, S. J., Leahy, D., Lee, M.-Y., Lynn, C., Ma, Y. K., Marchal, A., McClure-Griffiths, N. M., Nidever, D., …van Loon, J. T. (2024). A Galactic Eclipse: The Small Magellanic Cloud Is Forming Stars in Two Superimposed Systems. Astrophysical Journal, 962(2), Article 120. https://doi.org/10.3847/1538-4357/ad1591

The structure and dynamics of the star-forming disk of the Small Magellanic Cloud (SMC) have long confounded us. The SMC is widely used as a prototype for galactic physics at low metallicity, and yet we fundamentally lack an understanding of the stru... Read More about A Galactic Eclipse: The Small Magellanic Cloud Is Forming Stars in Two Superimposed Systems.

Hubble Space Telescope imaging of the compact elliptical galaxy M32 reveals a dearth of carbon stars (2023)
Journal Article
Jones, O. C., Boyer, M. L., McDonald, I., Meixner, M., & van Loon, J. T. (2023). Hubble Space Telescope imaging of the compact elliptical galaxy M32 reveals a dearth of carbon stars. Monthly Notices of the Royal Astronomical Society, 525(3), 3693-3702. https://doi.org/10.1093/mnras/stad2472

We present new Hubble Space Telescope WFC3/IR medium-band photometry of the compact elliptical galaxy M32, chemically resolving its thermally pulsating asymptotic giant branch stars. We find 2829 M-type stars and 57 C stars. The carbon stars are like... Read More about Hubble Space Telescope imaging of the compact elliptical galaxy M32 reveals a dearth of carbon stars.