Jacobus Van Loon's Outputs (193)

The nearby evolved stars survey – I. JCMT/SCUBA-2 submillimetre detection of the detached shell of U Antliae (2019)
Journal Article
van Loon, J. T. (2019). The nearby evolved stars survey – I. JCMT/SCUBA-2 submillimetre detection of the detached shell of U Antliae. Monthly Notices of the Royal Astronomical Society, 3218 -3231. https://doi.org/10.1093/mnras/stz2334

We present the highest resolution single-dish submillimetre observations of the detached shell source U Antliae to date. The observations were obtained at $450$ and $850\,µ\rm m$ with SCUBA-2 instrument on the James Clerk Maxwell Telescope as part of... Read More about The nearby evolved stars survey – I. JCMT/SCUBA-2 submillimetre detection of the detached shell of U Antliae.

Asymptotic Giant Branch Stars in the Nearby Dwarf Galaxy Leo P (2019)
Journal Article
Van Loon. (2019). Asymptotic Giant Branch Stars in the Nearby Dwarf Galaxy Leo P. Astrophysical Journal, https://doi.org/10.3847/1538-4357/ab418a

We have conducted a highly sensitive census of the evolved-star population in the metal-poor dwarf galaxy Leo P and detected four asymptotic giant branch (AGB) star candidates. Leo P is one of the best examples of a nearby analog of high-redshift gal... Read More about Asymptotic Giant Branch Stars in the Nearby Dwarf Galaxy Leo P.

Complex Organic Molecules in Star-Forming Regions of the Magellanic Clouds (2019)
Journal Article
Sewiło, M., Charnley, S. B., Schilke, P., Taquet, V., Oliveira, J. M., Shimonishi, T., …Hamedani Golshan, R. (2019). Complex Organic Molecules in Star-Forming Regions of the Magellanic Clouds. ACS Earth and Space Chemistry, 3(10), 2088-2109. https://doi.org/10.1021/acsearthspacechem.9b00065

The Large and Small Magellanic Clouds (LMC and SMC), gas-rich dwarf companions of the Milky Way, are the nearest laboratories for detailed studies on the formation and survival of complex organic molecules (COMs) under metal-poor conditions. To date,... Read More about Complex Organic Molecules in Star-Forming Regions of the Magellanic Clouds.

The VMC Survey - XXXV. Model fitting of LMC Cepheid light curves (2019)
Journal Article
Ragosta, F., Marconi, M., Molinaro, R., Ripepi, V., Cioni, M. R. L., Ida Moretti, M., …Gonzalez-Fernandez, C. (2019). The VMC Survey - XXXV. Model fitting of LMC Cepheid light curves. Monthly Notices of the Royal Astronomical Society, 490(4), 4975-4984. https://doi.org/10.1093/mnras/stz2881

We present the results of the light curve model fitting technique applied to optical and near-infrared photometric data for a sample of 18 Classical Cepheids (11 fundamentals and 7 first overtones) in the Large Magellanic Cloud (LMC). We use optical... Read More about The VMC Survey - XXXV. Model fitting of LMC Cepheid light curves.

Herschel spectroscopy of Massive Young Stellar Objects in the Magellanic Clouds (2019)
Journal Article
Oliveira, J., Van Loon, J. T., Sewilo, M., Lee, M., Lebouteiller, V., Chen, C. R., …Fukui, Y. (2019). Herschel spectroscopy of Massive Young Stellar Objects in the Magellanic Clouds. Monthly Notices of the Royal Astronomical Society, 490(3), 3903-3935. https://doi.org/10.1093/mnras/stz2810

We present Herschel Space Observatory Photodetector Array Camera and Spectrometer (PACS) and Spectral and Photometric Imaging Receiver Fourier Transform Spectrometer (SPIRE FTS) spectroscopy of a sample of twenty massive Young Stellar Objects (YSOs)... Read More about Herschel spectroscopy of Massive Young Stellar Objects in the Magellanic Clouds.

A three-dimensional map of the hot Local Bubble using diffuse interstellar bands (2019)
Journal Article
Van Loon. (2019). A three-dimensional map of the hot Local Bubble using diffuse interstellar bands. Nature Astronomy, 922 - 927. https://doi.org/10.1038/s41550-019-0814-z

The Solar System is located within a low-density cavity known as the Local Bubble1–3, which appears to be filled with an X-ray-emitting gas at a temperature of 106?K (ref. 4). Such conditions are too harsh for typical interstellar atoms and molecules... Read More about A three-dimensional map of the hot Local Bubble using diffuse interstellar bands.

Equality, diversity and inclusion perspectives (2019)
Journal Article
Van Loon. (2019). Equality, diversity and inclusion perspectives. Astronomy and Geophysics, 5.40 - 5.42. https://doi.org/10.1093/astrogeo/atz182

An overview of the developments arising from equality, diversity and inclusion events at this year’s National Astronomy Meeting, by Vinesh Maguire-Rajpaul on behalf of the organizers.

The ASKAP-EMU Early Science Project: Radio Continuum Survey of the Small Magellanic Cloud (2019)
Journal Article
Joseph, T. D., Filipović, M. D., Crawford, E. J., Bojičić, I., Alexander, E. L., Wong, G. F., …Grieve, K. R. (2019). The ASKAP-EMU Early Science Project: Radio Continuum Survey of the Small Magellanic Cloud. Monthly Notices of the Royal Astronomical Society, 490(1), 1202-1219. https://doi.org/10.1093/mnras/stz2650

We present two new radio continuum images from the Australian Square Kilometre Array Pathfinder (ASKAP) survey in the direction of the Small Magellanic Cloud (SMC). These images are part of the Evolutionary Map of the Universe (EMU) Early Science Pro... Read More about The ASKAP-EMU Early Science Project: Radio Continuum Survey of the Small Magellanic Cloud.

The VMC Survey - XXXIV. Morphology of Stellar Populations in the Magellanic Clouds (2019)
Journal Article
El Youssoufi, D., Cioni, M. L., Bell, C. P. M., Rubele, S., Bekki, K., de Grijs, R., …Van Loon, J. T. (2019). The VMC Survey - XXXIV. Morphology of Stellar Populations in the Magellanic Clouds. Monthly Notices of the Royal Astronomical Society, 490(1), 1076-1093. https://doi.org/10.1093/mnras/stz2400

The Magellanic Clouds are nearby dwarf irregular galaxies whose morphologies show different properties when traced by different stellar populations, making them an important laboratory for studying galaxy morphologies. We study the morphology of the... Read More about The VMC Survey - XXXIV. Morphology of Stellar Populations in the Magellanic Clouds.

The intrinsic reddening of the Magellanic Clouds as traced by background galaxies – I. The bar and outskirts of the Small Magellanic Cloud (2019)
Journal Article
Bell, C. P. M., Cioni, M. L., Wright, A. H., Rubele, S., Nidever, D. L., Tatton, B. L., …Muñoz, R. R. (2019). The intrinsic reddening of the Magellanic Clouds as traced by background galaxies – I. The bar and outskirts of the Small Magellanic Cloud. Monthly Notices of the Royal Astronomical Society, 3200 -3217. https://doi.org/10.1093/mnras/stz2325

We present a method to map the total intrinsic reddening of a foreground extinguishing medium via the analysis of spectral energy distributions (SEDs) of background galaxies. In this pilot study, we implement this technique in two distinct regions of... Read More about The intrinsic reddening of the Magellanic Clouds as traced by background galaxies – I. The bar and outskirts of the Small Magellanic Cloud.

The mass-loss, expansion velocities and dust production rates of carbon stars in the Magellanic Clouds (2019)
Journal Article
Van Loon. (2019). The mass-loss, expansion velocities and dust production rates of carbon stars in the Magellanic Clouds. Monthly Notices of the Royal Astronomical Society, 502-521. https://doi.org/10.1093/mnras/stz1255

The properties of carbon stars in the Magellanic Clouds (MCs) and their total dust production rates are predicted by fitting their spectral energy distributions (SED) over pre-computed grids of spectra reprocessed by dust. The grids are calculated as... Read More about The mass-loss, expansion velocities and dust production rates of carbon stars in the Magellanic Clouds.

Identification of Herbig Ae/Be Stars in the Small Magellanic Cloud (2019)
Journal Article
Keller, L. D., Sloan, G., Oliveira, J. M., Kraemer, K. E., Van Loon, J. T., Wood, P. R., …Knapp, T. (2019). Identification of Herbig Ae/Be Stars in the Small Magellanic Cloud. Astrophysical Journal, 878(2), 147 -147. https://doi.org/10.3847/1538-4357/ab204a

Protoplanetary disks orbiting intermediate-mass stars, Herbig Ae/Be stars, that have formed in a metal-poor environment may evolve differently than their Galactic cousins. A study of the planet-formation process in such an environment requires identi... Read More about Identification of Herbig Ae/Be Stars in the Small Magellanic Cloud.

An Infrared Census of DUST in Nearby Galaxies with Spitzer (DUSTiNGS). V. The Period-Luminosity Relation for Dusty Metal-poor AGB Stars (2019)
Journal Article
Van Loon. (2019). An Infrared Census of DUST in Nearby Galaxies with Spitzer (DUSTiNGS). V. The Period-Luminosity Relation for Dusty Metal-poor AGB Stars. Astrophysical Journal, https://doi.org/10.3847/1538-4357/ab0965

The survey for DUST in Nearby Galaxies with Spitzer (DUSTiNGS) has identified hundreds of candidate dust-producing asymptotic giant branch (AGB) stars in several nearby metal-poor galaxies. We have obtained multi-epoch follow-up observations for thes... Read More about An Infrared Census of DUST in Nearby Galaxies with Spitzer (DUSTiNGS). V. The Period-Luminosity Relation for Dusty Metal-poor AGB Stars.

The VLT-FLAMES Tarantula Survey - XXX. Red stragglers in the clusters Hodge 301 and SL 639 (2019)
Journal Article
Van Loon. (2019). The VLT-FLAMES Tarantula Survey - XXX. Red stragglers in the clusters Hodge 301 and SL 639. Astronomy and Astrophysics, A128 - A128. https://doi.org/10.1051/0004-6361/201834564

Aims. We estimate physical parameters for the late-type massive stars observed as part of the VLT-FLAMES Tarantula Survey (VFTS) in the 30 Doradus region of the Large Magellanic Cloud (LMC). Methods. The observational sample comprises 20 candidate re... Read More about The VLT-FLAMES Tarantula Survey - XXX. Red stragglers in the clusters Hodge 301 and SL 639.

The VLT-FLAMES Tarantula Survey - XXXI. Radial velocities and multiplicity constraints of red supergiant stars in 30 Doradus (2019)
Journal Article
Van Loon. (2019). The VLT-FLAMES Tarantula Survey - XXXI. Radial velocities and multiplicity constraints of red supergiant stars in 30 Doradus. Astronomy and Astrophysics, A129 - A129. https://doi.org/10.1051/0004-6361/201834951

Aims. The incidence of multiplicity in cool, luminous massive stars is relatively unknown compared to their hotter counterparts. In this work we present radial velocity (RV) measurements and investigate the multiplicity properties of red supergiants... Read More about The VLT-FLAMES Tarantula Survey - XXXI. Radial velocities and multiplicity constraints of red supergiant stars in 30 Doradus.

From evolved stars to the evolution of IC 1613 (2019)
Journal Article
Van Loon. (2019). From evolved stars to the evolution of IC 1613. Monthly Notices of the Royal Astronomical Society, 4751 -4765. https://doi.org/10.1093/mnras/sty3450

IC 1613 is a Local Group dwarf irregular galaxy at a distance of 750 kpc. In this work, we present an analysis of the star formation history (SFH) of a field of ~200 arcmin2 in the central part of the galaxy. To this aim, we use a novel method based... Read More about From evolved stars to the evolution of IC 1613.

The VMC Survey XXXIII. The tip of the red giant branch in the Magellanic Clouds (2019)
Journal Article
Van Loon. (2019). The VMC Survey XXXIII. The tip of the red giant branch in the Magellanic Clouds. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/201833904

In this paper JKs-band data from the VISTA Magellanic Cloud (VMC) survey are used to investigate the tip of the red giant branch (TRGB) as a distance indicator. A linear fit to recent theoretical models is used as the basis for the absolute calibrati... Read More about The VMC Survey XXXIII. The tip of the red giant branch in the Magellanic Clouds.

Identification of AGN in the XMM-Newton X-ray survey of the SMC (2019)
Journal Article
Maitra, C., Haberl, F., Ivanov, V. D., Cioni, M. L., & Van Loon, J. T. (2019). Identification of AGN in the XMM-Newton X-ray survey of the SMC. Astronomy & Astrophysics, 622, Article A29. https://doi.org/10.1051/0004-6361/201833663

Context
Finding Active Galactic Nuclei (AGN) behind the Magellanic Clouds (MCs) is difficult because of the high stellar density in these fields. Although the first AGN behind the Small Magellanic Cloud (SMC) were reported in the 1980s, it is only r... Read More about Identification of AGN in the XMM-Newton X-ray survey of the SMC.

The VMC Survey. XXXII. Pre-main-sequence populations in the Large Magellanic Cloud (2018)
Journal Article
Van Loon, J., & Oliveira, J. (2018). The VMC Survey. XXXII. Pre-main-sequence populations in the Large Magellanic Cloud. Astronomy and Astrophysics Supplement Series, https://doi.org/10.1051/0004-6361/201833951

Context
Detailed studies of intermediate- and low-mass pre-main-sequence (PMS) stars outside the Galaxy have so far been conducted only for small targeted regions harbouring known star formation complexes. The VISTA Survey of the Magellanic Clouds (... Read More about The VMC Survey. XXXII. Pre-main-sequence populations in the Large Magellanic Cloud.

X-ray powder diffraction study of the stability of clathrate hydrates in the presence of salts with relevance to the Martian cryosphere (2018)
Journal Article
Safi, E., Thompson, S. P., Evans, A., Day, S. J., Murray, C. A., Baker, A. R., …Van Loon, J. T. (2019). X-ray powder diffraction study of the stability of clathrate hydrates in the presence of salts with relevance to the Martian cryosphere. Geochimica et Cosmochimica Acta, 245, 304-315. https://doi.org/10.1016/j.gca.2018.10.034

Water on the present day Martian surface is thought to exist in two thermally distinct sub-surface reservoirs: as ice in the cryosphere and as groundwater located deeper in the crust. These sub-surface environments are thought to contain saline, rath... Read More about X-ray powder diffraction study of the stability of clathrate hydrates in the presence of salts with relevance to the Martian cryosphere.