All Outputs (156)

Star formation histories in NGC 147 and NGC 185 (2017)
Journal Article
Van Loon. (2017). Star formation histories in NGC 147 and NGC 185. Journal of Physics: Conference Series, https://doi.org/10.1088/1742-6596/869/1/012087

NGC 147 and NGC 185 are two of the most massive satellites of the Andromeda galaxy (M 31). With similar mass and morphological type dE, they possess different amounts of interstellar gas and tidal distortion. The question therefore is, how do their h... Read More about Star formation histories in NGC 147 and NGC 185.

Very Deep inside the SN 1987A Core Ejecta: Molecular Structures Seen in 3D (2017)
Journal Article
Abellán, F. J., Indebetouw, R., Marcaide, J. M., Gabler, M., Fransson, C., Spyromilio, J., …Woosley, S. E. (in press). Very Deep inside the SN 1987A Core Ejecta: Molecular Structures Seen in 3D. Astrophysical Journal Letters, 842(2), L24. https://doi.org/10.3847/2041-8213/aa784c

Most massive stars end their lives in core-collapse supernova explosions and enrich the interstellar medium with explosively nucleosynthesized elements. Following core collapse, the explosion is subject to instabilities as the shock propagates outwar... Read More about Very Deep inside the SN 1987A Core Ejecta: Molecular Structures Seen in 3D.

The VMC Survey - XXIV. Signatures of tidally stripped stellar populations from the inner Small Magellanic Cloud (2017)
Journal Article
Van Loon. (2017). The VMC Survey - XXIV. Signatures of tidally stripped stellar populations from the inner Small Magellanic Cloud. Monthly Notices of the Royal Astronomical Society, 2980 - 2995. https://doi.org/10.1093/mnras/stx205

We study the luminosity function of intermediate-age red clump stars using deep, near-infrared photometric data covering ~20 deg2 located throughout the central part of the Small Magellanic Cloud (SMC), comprising the main body and the galaxy's easte... Read More about The VMC Survey - XXIV. Signatures of tidally stripped stellar populations from the inner Small Magellanic Cloud.

Monitoring survey of pulsating giant stars in the Local Group galaxies: survey description, science goals, target selection (2017)
Journal Article
Van Loon. (2017). Monitoring survey of pulsating giant stars in the Local Group galaxies: survey description, science goals, target selection. Journal of Physics: Conference Series, https://doi.org/10.1088/1742-6596/869/1/012068

The population of nearby dwarf galaxies in the Local Group constitutes a complete galactic environment, perfect suited for studying the connection between stellar populations and galaxy evolution. In this study, we are conducting an optical monitorin... Read More about Monitoring survey of pulsating giant stars in the Local Group galaxies: survey description, science goals, target selection.

Monitoring pulsating giant stars in M33: star formation history and chemical enrichment (2017)
Journal Article
Van Loon. (2017). Monitoring pulsating giant stars in M33: star formation history and chemical enrichment. Journal of Physics: Conference Series, https://doi.org/10.1088/1742-6596/869/1/012062

We have conducted a near-infrared monitoring campaign at the UK InfraRed Telescope (UKIRT), of the Local Group spiral galaxy M33 (Triangulum). A new method has been developed by us to use pulsating giant stars to reconstruct the star formation histor... Read More about Monitoring pulsating giant stars in M33: star formation history and chemical enrichment.

The SAGE-Spec Spitzer Legacy program: the life-cycle of dust and gas in the Large Magellanic Cloud. Point source classification - III (2017)
Journal Article
Jones, O., Woods, P., Kemper, F., Kraemer, K., Sloan, G., Srinivasan, S., …Volk, K. (2017). The SAGE-Spec Spitzer Legacy program: the life-cycle of dust and gas in the Large Magellanic Cloud. Point source classification - III. Monthly Notices of the Royal Astronomical Society, 470(3), 3250 -3282. https://doi.org/10.1093/mnras/stx1101

The Infrared Spectrograph (IRS) on the Spitzer Space Telescope observed nearly 800 point sources in the Large Magellanic Cloud (LMC), taking over 1000 spectra. 197 of these targets were observed as part of the SAGE-Spec Spitzer Legacy program; the re... Read More about The SAGE-Spec Spitzer Legacy program: the life-cycle of dust and gas in the Large Magellanic Cloud. Point source classification - III.

Properties of CO$_2$ clathrate hydrates formed in the presence of MgSO$_4$ solutions with implications for icy moons (2017)
Journal Article
Safi, E., Thompson, S., Evans, A., Day, S., Murray, C., Parker, J., …Van Loon, J. T. (2017). Properties of CO$_2$ clathrate hydrates formed in the presence of MgSO$_4$ solutions with implications for icy moons. Astronomy & Astrophysics, 600(A88), https://doi.org/10.1051/0004-6361/201629791

There is evidence to suggest that clathrate hydrates have a significant effect on the surface geology of icy bodies in the Solar System. However the aqueous environments believed to be present on these bodies are likely to be saline rather than pure... Read More about Properties of CO$_2$ clathrate hydrates formed in the presence of MgSO$_4$ solutions with implications for icy moons.

The VLT-FLAMES Tarantula Survey: XXV. Surface nitrogen abundances of O-type giants and supergiants⋆⋆⋆ (2017)
Journal Article
Grin, N. J., Ramírez-Agudelo, O. H., de Koter, A., Sana, H., Puls, J., Brott, I., …Walborn, N. R. (2017). The VLT-FLAMES Tarantula Survey: XXV. Surface nitrogen abundances of O-type giants and supergiants⋆⋆⋆. Astronomy & Astrophysics, 600, Article A82. https://doi.org/10.1051/0004-6361/201629225

Context. Theoretically, rotation-induced chemical mixing in massive stars has far reaching evolutionary consequences, affecting the sequence of morphological phases, lifetimes, nucleosynthesis, and supernova characteristics. Aims. Using a sample o... Read More about The VLT-FLAMES Tarantula Survey: XXV. Surface nitrogen abundances of O-type giants and supergiants⋆⋆⋆.

ALMA observations of Molecules in Supernova 1987A (2017)
Journal Article
Matsuura, M., Indebetouw, R., Woosley, S., Bujarrabal, V., Abellán, F. J., McCray, R., …Yates, J. (2017). ALMA observations of Molecules in Supernova 1987A. Proceedings of the International Astronomical Union, 12(S331), 294-299. https://doi.org/10.1017/s1743921317004719

Supernova (SN) 1987A has provided a unique opportunity to study how SN ejecta evolve in 30 years time scale. We report our ALMA spectral observations of SN 1987A, taken in 2014, 2015 and 2016, with detections of CO, 28SiO, HCO+ and SO, with weaker li... Read More about ALMA observations of Molecules in Supernova 1987A.

The wind speeds, dust content, and mass-loss rates of evolved AGB and RSG stars at varying metallicity (2016)
Journal Article
Goldman, S. R., van Loon, J. T., Zijlstra, A. A., Green, J. A., Wood, P. R., Nanni, A., …Gómez, J. F. (2017). The wind speeds, dust content, and mass-loss rates of evolved AGB and RSG stars at varying metallicity. Monthly Notices of the Royal Astronomical Society, 465(1), 403-433. https://doi.org/10.1093/mnras/stw2708

We present the results of our survey of 1612-MHz circumstellar OH maser emission from asymptotic giant branch (AGB) stars and red supergiants (RSGs) in the Large Magellanic Cloud (LMC). We have discovered four new circumstellar maser sources in the L... Read More about The wind speeds, dust content, and mass-loss rates of evolved AGB and RSG stars at varying metallicity.

K-band integral field spectroscopy and optical spectroscopy of massive young stellar objects in the Small Magellanic Cloud (2016)
Journal Article
Ward, J., Oliveira, J., Van Loon, J. T., & Sewiło, M. (2017). K-band integral field spectroscopy and optical spectroscopy of massive young stellar objects in the Small Magellanic Cloud. Monthly Notices of the Royal Astronomical Society, 464(2), 1512 -1552. https://doi.org/10.1093/mnras/stw2386

We present K-band integral field spectroscopic observations towards 17 massive young stellar objects (YSOs) in the low-metallicity Small Magellanic Cloud (SMC) and two YSO candidates in the compact H?II regions N81 and N88 A (also in the SMC). These... Read More about K-band integral field spectroscopy and optical spectroscopy of massive young stellar objects in the Small Magellanic Cloud.

XVII. Proper motions of the Small Magellanic Cloud and the Milky Way globular cluster 47 Tucanae (2016)
Journal Article
Cioni, M. L., Bekki, K., Girardi, L., de Grijs, R., Irwin, M. J., Ivanov, V. D., …Van Loon, J. T. (2016). XVII. Proper motions of the Small Magellanic Cloud and the Milky Way globular cluster 47 Tucanae. Astronomy & Astrophysics, 586, Article A77. https://doi.org/10.1051/0004-6361/201527004

Aims. In this study we use multi-epoch near-infrared observations from the VISTA survey of the Magellanic Cloud system (VMC) to measure the proper motions of different stellar populations in a tile of 1.5 deg2 in size in the direction of the Galactic... Read More about XVII. Proper motions of the Small Magellanic Cloud and the Milky Way globular cluster 47 Tucanae.

Detecting Long Period Variables in M 33 Using UKIRT-WFCAM Images (2015)
Conference Proceeding
Saberi, M., Javadi, A., van Loon, J. T., & Khosroshahi, H. (2015). Detecting Long Period Variables in M 33 Using UKIRT-WFCAM Images. In Vol. 497 – Why Galaxies Care about AGB Stars III: A Closer Look in Space and Time (497)

We have used the UK InfraRed Telescope (UKIRT) to conduct a near-IR monitoring campaign to search for variable stars in the Local Group spiral galaxy M 33. Most of the 4643 detected variables appear to be Asymptotic Giant Branch (AGB) stars.

DUST in Nearby Galaxies with Spitzer (DUSTINGS): An Infrared Census of Extreme AGB Stars in Nearby Dwarf Galaxies (2015)
Conference Proceeding
Boyer, M. L., McQuinn, K. . B. . W., Barmby, P., Bonanos, A. . Z., Gehrz, R. . D., Gordon, K. . D., …Zijlstra, A. . A. (2015). DUST in Nearby Galaxies with Spitzer (DUSTINGS): An Infrared Census of Extreme AGB Stars in Nearby Dwarf Galaxies. In 497, Why Galaxies Care about AGB Stars III: A Closer Look in Space and Time

Nearby resolved dwarf galaxies provide excellent opportunities for studying the dust-producing late stages of stellar evolution. DUSTiNGS (DUST in Nearby Galaxies with Spitzer) is a 3.6- and 4.5-μm imaging survey of 50 dwarf galaxies within 1.5 Mpc.... Read More about DUST in Nearby Galaxies with Spitzer (DUSTINGS): An Infrared Census of Extreme AGB Stars in Nearby Dwarf Galaxies.

Probing the Local Bubble with diffuse interstellar bands: I. Project overview and southern hemisphere survey⋆ (2015)
Journal Article
Bailey, M., van Loon, J. T., Farhang, A., Javadi, A., Khosroshahi, H. G., Sarre, P. J., & Smith, K. T. (2016). Probing the Local Bubble with diffuse interstellar bands: I. Project overview and southern hemisphere survey⋆. Astronomy & Astrophysics, 585, A12. https://doi.org/10.1051/0004-6361/201526656

Context. The Sun traverses a low-density, hot entity called the Local Bubble. Despite its relevance to life on Earth, the conditions in the Local Bubble and its exact configuration are not very well known. Besides that, there is some unknown interste... Read More about Probing the Local Bubble with diffuse interstellar bands: I. Project overview and southern hemisphere survey⋆.

Detection of Rotational CO Emission From the Red-supergiants in the Large Magellanic Cloud (2015)
Journal Article
Matsuura, M., Sargent, B., Swinyard, B., Yates, J., Royer, P., Barlow, M., …Woods, P. (2015). Detection of Rotational CO Emission From the Red-supergiants in the Large Magellanic Cloud. EAS Publications Series, 71-72, 53-56. https://doi.org/10.1051/eas/1571010

It is yet well understood how mass-loss rates from evolved stars depend on metallicities. With a half of the solar metallicity and the distance of only 50 kpc, the evolved stars of the Large Magellanic Cloud (LMC) are an ideal target for studying mas... Read More about Detection of Rotational CO Emission From the Red-supergiants in the Large Magellanic Cloud.

2dF-AAOmega spectroscopy of massive stars in the Magellanic Clouds: The north-eastern region of the Large Magellanic Cloud⋆⋆⋆ (2015)
Journal Article
Evans, C. J., van Loon, J. T., Hainich, R., & Bailey, M. (2015). 2dF-AAOmega spectroscopy of massive stars in the Magellanic Clouds: The north-eastern region of the Large Magellanic Cloud⋆⋆⋆. Astronomy & Astrophysics, 584, Article A5. https://doi.org/10.1051/0004-6361/201525882

We present spectral classifications from optical spectroscopy of 263 massive stars in the north-eastern region of the Large Magellanic Cloud. The observed two-degree field includes the massive 30 Doradus star-forming region, the environs of SN1987A,... Read More about 2dF-AAOmega spectroscopy of massive stars in the Magellanic Clouds: The north-eastern region of the Large Magellanic Cloud⋆⋆⋆.

Mapping atomic and difuse interstellar band absorption across the Magellanic clouds and the Milky Way (2015)
Journal Article
Bailey, M., Van Loon, J. T., Sarre, P. J., & Beckman, J. E. (2015). Mapping atomic and difuse interstellar band absorption across the Magellanic clouds and the Milky Way. Monthly Notices of the Royal Astronomical Society, 454(4), 4013-4026. https://doi.org/10.1093/mnras/stv2178

Diffuse interstellar bands (DIBs) trace warm neutral and weakly ionized diffuse interstellar medium (ISM). Here we present a dedicated, high signal-to-noise spectroscopic survey of two of the strongest DIBs, at 5780 and 5797 Å, in optical spectra of... Read More about Mapping atomic and difuse interstellar band absorption across the Magellanic clouds and the Milky Way.

ALMA reveals sunburn: CO dissociation around AGB stars in the globular cluster 47 Tucanae (2015)
Journal Article
McDonald, I., Zijlstra, A. A., Lagadec, E., Sloan, G. C., Boyer, M. L., Matsuura, M., …Groenewegen, M. A. T. (2015). ALMA reveals sunburn: CO dissociation around AGB stars in the globular cluster 47 Tucanae. Monthly Notices of the Royal Astronomical Society, 453(4), 4325-4337. https://doi.org/10.1093/mnras/stv1968

Atacama Large Millimetre Array observations show a non-detection of carbon monoxide around the four most luminous asymptotic giant branch (AGB) stars in the globular cluster 47 Tucanae. Stellar evolution models and star counts show that the mass-loss... Read More about ALMA reveals sunburn: CO dissociation around AGB stars in the globular cluster 47 Tucanae.

An evolutionary missing link? A modest-mass early-type galaxy hosting an oversized nuclear black hole (2015)
Journal Article
van Loon, J. T., & Sansom, A. E. (2015). An evolutionary missing link? A modest-mass early-type galaxy hosting an oversized nuclear black hole. Monthly Notices of the Royal Astronomical Society, 453(3), 2342-2349. https://doi.org/10.1093/mnras/stv1787

SAGE1C J053634.78−722658.5 is a galaxy at redshift z = 0.14, discovered behind the Large Magellanic Cloud in the SpitzerSpace Telescope‘Surveying the Agents of Galaxy Evolution’ Spectroscopy survey. It has very strong silicate emission at 10 μm but n... Read More about An evolutionary missing link? A modest-mass early-type galaxy hosting an oversized nuclear black hole.