Jacobus Van Loon's Outputs (19)

ALMA spectral survey of Supernova 1987A-molecular inventory, chemistry, dynamics and explosive nucleosynthesis (2017)
Journal Article
Van Loon. (2017). ALMA spectral survey of Supernova 1987A-molecular inventory, chemistry, dynamics and explosive nucleosynthesis. Monthly Notices of the Royal Astronomical Society, 3347 -3362. https://doi.org/10.1093/mnras/stx830

We report the first molecular line survey of Supernova 1987A in the millimetre wavelength range. In the Atacama Large Millimeter/submillimeter Array (ALMA) 210–300 and 340–360 GHz spectra, we detected cold (20–170 K) CO, 28SiO, HCO+ and SO, with weak... Read More about ALMA spectral survey of Supernova 1987A-molecular inventory, chemistry, dynamics and explosive nucleosynthesis.

DUSTiNGS III: Distribution of Intermediate-Age and Old Stellar Populations in Disks and Outer Extremities of Dwarf Galaxies (2017)
Journal Article
Van Loon. (2017). DUSTiNGS III: Distribution of Intermediate-Age and Old Stellar Populations in Disks and Outer Extremities of Dwarf Galaxies. Astrophysical Journal, https://doi.org/10.3847/1538-4357/834/1/78

We have traced the spatial distributions of intermediate-age and old stars in nine dwarf galaxies in the distant parts of the Local Group, using multi-epoch 3.6 and 4.5 µm data from the DUST in Nearby Galaxies with Spitzer (DUSTiNGS) survey. Using co... Read More about DUSTiNGS III: Distribution of Intermediate-Age and Old Stellar Populations in Disks and Outer Extremities of Dwarf Galaxies.

The ALMA detection of CO rotational line emission in AGB stars in the Large Magellanic Cloud (2016)
Journal Article
Van Loon. (2016). The ALMA detection of CO rotational line emission in AGB stars in the Large Magellanic Cloud. Astronomy and Astrophysics, https://doi.org/10.1051/0004-6361/201629590

Context. Low- and intermediate-mass stars lose most of their stellar mass at the end of their lives on the asymptotic giant branch (AGB). Determining gas and dust mass-loss rates (MLRs) is important in quantifying the contribution of evolved stars to... Read More about The ALMA detection of CO rotational line emission in AGB stars in the Large Magellanic Cloud.

The mass-loss rates of red supergiants at low metallicity: detection of rotational CO emission from two red supergiants in the Large Magellanic Cloud (2016)
Journal Article
Van Loon. (2016). The mass-loss rates of red supergiants at low metallicity: detection of rotational CO emission from two red supergiants in the Large Magellanic Cloud. Monthly Notices of the Royal Astronomical Society, 2995 - 3005. https://doi.org/10.1093/mnras/stw1853

Using the PACS and SPIRE spectrometers on-board the Herschel Space Observatory, we obtained spectra of two red supergiants (RSGs) in the Large Magellanic Cloud (LMC). Multiple rotational CO emission lines (J = 6–5 to 15-14) and 15 H2O lines were dete... Read More about The mass-loss rates of red supergiants at low metallicity: detection of rotational CO emission from two red supergiants in the Large Magellanic Cloud.

The infrared spectral properties of magellanic carbon stars (2016)
Journal Article
Van Loon. (2016). The infrared spectral properties of magellanic carbon stars. Astrophysical Journal, https://doi.org/10.3847/0004-637X/826/1/44

The Infrared Spectrograph on the Spitzer Space Telescope observed 184 carbon stars in the Magellanic Clouds. This sample reveals that the dust-production rate (DPR) from carbon stars generally increases with the pulsation period of the star. The comp... Read More about The infrared spectral properties of magellanic carbon stars.

CK Vul: a smorgasbord of hydrocarbons rules out a 1670 nova (and much else besides) (2016)
Journal Article
Van Loon. (2016). CK Vul: a smorgasbord of hydrocarbons rules out a 1670 nova (and much else besides). Monthly Notices of the Royal Astronomical Society, 2871 - 2876. https://doi.org/10.1093/mnras/stw352

We present observations of CK Vul obtained with the Spitzer Space Telescope. The infrared spectrum reveals a warm dust continuum with nebular, molecular hydrogen and HCN lines superimposed, together with the ‘Unidentified Infrared’ features. The nebu... Read More about CK Vul: a smorgasbord of hydrocarbons rules out a 1670 nova (and much else besides).

New quasars behind the Magellanic Clouds. Spectroscopic confirmation of near-infrared selected candidates (2016)
Journal Article
Van Loon. (2016). New quasars behind the Magellanic Clouds. Spectroscopic confirmation of near-infrared selected candidates. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/201527398

Context. Quasi-stellar objects (quasars) located behind nearby galaxies provide an excellent absolute reference system for astrometric studies, but they are difficult to identify because of fore- and background contamination. Deep wide-field, high an... Read More about New quasars behind the Magellanic Clouds. Spectroscopic confirmation of near-infrared selected candidates.

Integral field spectroscopy of massive young stellar objects in the N113 H II region in the Large Magellanic Cloud (2015)
Journal Article
Ward, J., Oliveira, J., Van Loon, J. T., & Sewiło, M. (2016). Integral field spectroscopy of massive young stellar objects in the N113 H II region in the Large Magellanic Cloud. Monthly Notices of the Royal Astronomical Society, 455(3), 2345 - 2362. https://doi.org/10.1093/mnras/stv2424

The Spitzer Surveying the Agents of Galaxy Evolution (SAGE) survey has allowed the identification and analysis of significant samples of Young Stellar Object (YSO) candidates in the Large Magellanic Cloud (LMC). However, the angular resolution of Spi... Read More about Integral field spectroscopy of massive young stellar objects in the N113 H II region in the Large Magellanic Cloud.

The VMC survey - XIV. First results on the look-back time star formation rate tomography of the Small Magellanic Cloud (2015)
Journal Article
Van Loon. (2015). The VMC survey - XIV. First results on the look-back time star formation rate tomography of the Small Magellanic Cloud. Monthly Notices of the Royal Astronomical Society, 639 -661. https://doi.org/10.1093/mnras/stv141

We analyse deep images from the VISTA survey of the Magellanic Clouds in the YJKs filters, covering 14 deg2 (10 tiles), split into 120 subregions, and comprising the main body and Wing of the Small Magellanic Cloud (SMC). We apply a colour–magnitude... Read More about The VMC survey - XIV. First results on the look-back time star formation rate tomography of the Small Magellanic Cloud.

The UK Infrared Telescope M33 monitoring project - IV. Variable red giant stars across the galactic disc (2015)
Journal Article
Van Loon. (2015). The UK Infrared Telescope M33 monitoring project - IV. Variable red giant stars across the galactic disc. Monthly Notices of the Royal Astronomical Society, 3973 -3991. https://doi.org/10.1093/mnras/stu2637

We have conducted a near-infrared monitoring campaign at the UK InfraRed Telescope, of the Local Group spiral galaxy M33 (Triangulum). The main aim was to identify stars in the very final stage of their evolution, and for which the luminosity is more... Read More about The UK Infrared Telescope M33 monitoring project - IV. Variable red giant stars across the galactic disc.

Probing the local bubble with diffuse interstellar abnds. II. The Dib properties in the northern hemisphere (2015)
Journal Article
Van Loon. (2015). Probing the local bubble with diffuse interstellar abnds. II. The Dib properties in the northern hemisphere. Astrophysical Journal, https://doi.org/10.1088/0004-637X/800/1/64

We present a new high signal-to-noise ratio spectroscopic survey of the Northern hemisphere to probe the Local Bubble and its surroundings using the ?5780 Å and ?5797 Å diffuse interstellar bands (DIBs). We observed 432 sightlines to a distance of 20... Read More about Probing the local bubble with diffuse interstellar abnds. II. The Dib properties in the northern hemisphere.

Probing the local bubble with diffuse interstellar bands. III. The northern hemisphere data and catalog (2015)
Journal Article
Van Loon. (2015). Probing the local bubble with diffuse interstellar bands. III. The northern hemisphere data and catalog. Astrophysical Journal, 33. https://doi.org/10.1088/0067-0049/216/2/33

We present new high signal-to-noise ratio (S/N) observations of the diffuse interstellar bands (DIBs) in the Local Bubble and its surroundings. We observed 432 sightlines and obtain the equivalent widths of the ?5780 and ?5797 Å DIBs up to a distance... Read More about Probing the local bubble with diffuse interstellar bands. III. The northern hemisphere data and catalog.

An infrared census of dust in nearby galaxies with Spitxer (Dustings). II. Discovery of metal-poor dusty AGB stars (2015)
Journal Article
Van Loon. (2015). An infrared census of dust in nearby galaxies with Spitxer (Dustings). II. Discovery of metal-poor dusty AGB stars. Astrophysical Journal, 51. https://doi.org/10.1088/0004-637X/800/1/51

The DUSTiNGS survey (DUST in Nearby Galaxies with Spitzer) is a 3.6 and 4.5 µm imaging survey of 50 nearby dwarf galaxies designed to identify dust-producing asymptotic giant branch (AGB) stars and massive stars. Using two epochs, spaced approximatel... Read More about An infrared census of dust in nearby galaxies with Spitxer (Dustings). II. Discovery of metal-poor dusty AGB stars.

The influence of supernova remnants on the interstellar medium in the large magellanic cloud seen at 20-600 mu m wavelengths (2015)
Journal Article
Van Loon. (2015). The influence of supernova remnants on the interstellar medium in the large magellanic cloud seen at 20-600 mu m wavelengths. Astrophysical Journal, https://doi.org/10.1088/0004-637X/799/1/50

We present the analysis of supernova remnants (SNRs) in the Large Magellanic Cloud (LMC) and their influence on the environment at far-infrared (FIR) and submillimeter wavelengths. We use new observations obtained with the Herschel Space Observatory... Read More about The influence of supernova remnants on the interstellar medium in the large magellanic cloud seen at 20-600 mu m wavelengths.

An infrared census of dust in nearby galaxies with Spitzer (Dustings). I. Overview (2014)
Journal Article
Van Loon. (2014). An infrared census of dust in nearby galaxies with Spitzer (Dustings). I. Overview. Astrophysical Journal, https://doi.org/10.1088/0067-0049/216/1/10

Nearby resolved dwarf galaxies provide excellent opportunities for studying the dust-producing late stages of stellar evolution over a wide range of metallicity (–2.7 lesssim [Fe/H] lesssim –1.0). Here, we describe DUSTiNGS (DUST in Nearby Galaxies w... Read More about An infrared census of dust in nearby galaxies with Spitzer (Dustings). I. Overview.

The star formation history of the Magellanic Clouds derived from long-period variable star counts (2014)
Journal Article
Van Loon. (2014). The star formation history of the Magellanic Clouds derived from long-period variable star counts. Monthly Notices of the Royal Astronomical Society, 2214 -2222. https://doi.org/10.1093/mnras/stu1807

We present the first reconstruction of the star formation history (SFH) of the Large and Small Magellanic Clouds (LMC and SMC) using Long Period Variable stars. These cool evolved stars reach their peak luminosity in the near-infrared; thus, their K-... Read More about The star formation history of the Magellanic Clouds derived from long-period variable star counts.

Spectral and morphological analysis of the remnant of supernova 1987A with Alma and Atca (2014)
Journal Article
Van Loon. (2014). Spectral and morphological analysis of the remnant of supernova 1987A with Alma and Atca. Astrophysical Journal, https://doi.org/10.1088/0004-637X/796/2/82

We present a comprehensive spectral and morphological analysis of the remnant of supernova (SN) 1987A with the Australia Telescope Compact Array (ATCA) and the Atacama Large Millimeter/submillimeter Array (ALMA). The non-thermal and thermal component... Read More about Spectral and morphological analysis of the remnant of supernova 1987A with Alma and Atca.

Circumstellar discs around solar-mass stars in NGC 6611 (2005)
Journal Article
Oliveira, J., Jeffries, R., Th. van Loon, J., Littlefair, S., & Naylor, T. (2005). Circumstellar discs around solar-mass stars in NGC 6611. Monthly Notices of the Royal Astronomical Society: Letters, 358(1), L21-L24. https://doi.org/10.1111/j.1745-3933.2005.00020.x

We have performed IZJHKL' observations in NGC 6611, the young cluster that ionises the Eagle Nebula. We have discovered a rich pre-main sequence concentrated around the O-stars in the cluster. As measured by their L'-band excesses, at least 58% +/- 5... Read More about Circumstellar discs around solar-mass stars in NGC 6611.

An L'-band survey for circumstellar discs around low-mass stars in the young σ Orionis cluster (2004)
Journal Article
Jeffries, R., Oliveira, J., & Van Loon, J. (2004). An L'-band survey for circumstellar discs around low-mass stars in the young σ Orionis cluster. Monthly Notices of the Royal Astronomical Society, 347(4), 1327 -1336. https://doi.org/10.1111/j.1365-2966.2004.07315.x

We present new K- and L'-band imaging of a representative sample of members of the young 3-5 Myr old sigma Orionis cluster. We identified objects with (K-L') excess by analysing colour-colour diagrams and comparing the observations with empirical mai... Read More about An L'-band survey for circumstellar discs around low-mass stars in the young σ Orionis cluster.