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.

Gas phase SiO in the circumstellar environment of the recurrent nova T Coronae Borealis (2019)
Journal Article
(2019). Gas phase SiO in the circumstellar environment of the recurrent nova T Coronae Borealis. Monthly Notices of the Royal Astronomical Society, 3498-3505. https://doi.org/10.1093/mnras/stz1071

We report the discovery of the diatomic molecule SiO in the gas phase in the environment of the recurrent nova T Coronae Borealis. While some of the SiO is photospheric, a substantial portion must arise in the wind from the red giant component of T C... Read More about Gas phase SiO in the circumstellar environment of the recurrent nova T Coronae Borealis.

Grids of stellar models with rotation IV. Models from 1.7 to 120 M-circle dot at a metallicity Z=0.0004 (2019)
Journal Article
Groh, J., Ekström, S., Georgy, C., Meynet, G., Choplin, A., Eggenberger, P., Hirschi, R., Maeder, A., Murphy, L., Boian, I., & Farrell, E. (2019). Grids of stellar models with rotation IV. Models from 1.7 to 120 M-circle dot at a metallicity Z=0.0004. Astronomy & Astrophysics, 627, Article A24. https://doi.org/10.1051/0004-6361/201833720

The effects of rotation on stellar evolution are particularly important at low metallicity, when mass loss by stellar winds diminishes and the surface enrichment due to rotational mixing becomes relatively more pronounced than at high metallicities.... Read More about Grids of stellar models with rotation IV. Models from 1.7 to 120 M-circle dot at a metallicity Z=0.0004.

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., Zijlstra, A., Simon, J. D., Ferreira, R., Garay-MacLean, M., Hyatt, J. T., Geidel, K., Quinn, J., Santoro, D., & 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.

The EBLM Project VI. The mass and radius of five low-mass stars in F+M binaries discovered by the WASP survey (2019)
Journal Article
Gill, S., Maxted, P., Evans, J., Evans, D., Smalley, B., Gary, B., Southworth, J., Anderson, D., Bouchy, F., Cameron, A., Dominik, M., Faedi, F., Gillon, M., Gomez Maqueo Chew, Y., Hebb, L., Hellier, C., Jørgensen, U., Longa-Peña, P., Martin, D., McCormac, J., …West, R. (2019). The EBLM Project VI. The mass and radius of five low-mass stars in F+M binaries discovered by the WASP survey. Astronomy & Astrophysics, 626, Article A119. https://doi.org/10.1051/0004-6361/201833054

Some M-dwarfs around F-/G-type stars have been measured to be hotter and larger than predicted by stellar evolution models. Inconsistencies between observations and models need addressing with more mass, radius and luminosity measurements of low-mass... Read More about The EBLM Project VI. The mass and radius of five low-mass stars in F+M binaries discovered by the WASP survey.

Two temperate sub-Neptunes transiting the star EPIC 212737443 (2019)
Journal Article
(2019). Two temperate sub-Neptunes transiting the star EPIC 212737443. Monthly Notices of the Royal Astronomical Society, 536-546. https://doi.org/10.1093/mnras/stz1641

We report the validation of a new planetary system around the K3 star EPIC 212737443 using a combination of K2 photometry, follow-up high resolution imaging and spectroscopy. The system consists of two sub-Neptune sized transiting planets with radii... Read More about Two temperate sub-Neptunes transiting the star EPIC 212737443.

Expanding associations in the Vela-Puppis region - 3D structure and kinematics of the young population (2019)
Journal Article
Cantat-Gaudin, T., Jordi1, C., Wright, N., Armstrong, J., Vallenari, A., Balaguer-Núñez, L., Ramos, P., Bossini, D., Padoan, P., Pelkonen, V., Mapelli, M., & Jeffries, R. (2019). Expanding associations in the Vela-Puppis region - 3D structure and kinematics of the young population. Astronomy and Astrophysics, A17 - A17. https://doi.org/10.1051/0004-6361/201834957

Context. The Vela-Puppis region is known to host the Vela OB2 association as well as several young clusters featuring OB and pre-main-sequence stars. Several spatial and kinematic subgroups have been identified in recent years. Aims. By grouping star... Read More about Expanding associations in the Vela-Puppis region - 3D structure and kinematics of the young population.

The EBLM Project V. Physical properties of ten fully convective, very-low-mass stars (2019)
Journal Article
Maxted, Smalley, & Hellier. (2019). The EBLM Project V. Physical properties of ten fully convective, very-low-mass stars. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/201834539

Measurements of the physical properties of stars at the lower end of the main sequence are scarce. In this context we report masses, radii and surface gravities of ten very-low-mass stars in eclipsing binary systems, with orbital periods of the order... Read More about The EBLM Project V. Physical properties of ten fully convective, very-low-mass stars.

The O star hinterland of the Galactic starburst, NGC 3603 (2019)
Journal Article
Wright. (2019). The O star hinterland of the Galactic starburst, NGC 3603. Monthly Notices of the Royal Astronomical Society, 1034-1044. https://doi.org/10.1093/mnras/stz864

The very bright and compact massive young cluster, NGC 3603, has been cited as an example of a starburst in the Milky Way and compared with the much-studied R136/30 Doradus region in the Large Magellanic Cloud. Here we build on the discovery by Mohr-... Read More about The O star hinterland of the Galactic starburst, NGC 3603.

Three Hot-Jupiters on the upper edge of the mass-radius distribution: WASP-177, WASP-181 and WASP-183 (2019)
Journal Article
Maxted, Smalley, & Hellier. (2019). Three Hot-Jupiters on the upper edge of the mass-radius distribution: WASP-177, WASP-181 and WASP-183. Monthly Notices of the Royal Astronomical Society, 5790-5799. https://doi.org/10.1093/mnras/stz742

We present the discovery of 3 transiting planets from the WASP survey, two hot-Jupiters: WASP-177 b (~0.5 MJup, ~1.6 RJup) in a 3.07-d orbit of a V = 12.6 K2 star, WASP-183 b (~0.5 MJup, ~1.5 RJup) in a 4.11-d orbit of a V = 12.8 G9/K0 star; and one... Read More about Three Hot-Jupiters on the upper edge of the mass-radius distribution: WASP-177, WASP-181 and WASP-183.

An analysis of binary microlensing event OGLE-2015-BLG-0060 (2019)
Journal Article
Tsapras, Y., Cassan, A., Ranc, C., Bachelet, E., Street, R., Udalski, A., Hundertmark, M., Bozza, V., Beaulieu, J. P., Marquette, J. B., Euteneuer, E., Bramich, D. M., Dominik, M., Figuera Jaimes, R., Horne, K., Mao, S., Menzies, J., Schmidt, R., Snodgrass, C., Steele, I. A., …collaboration, T. M. (2019). An analysis of binary microlensing event OGLE-2015-BLG-0060. Monthly Notices of the Royal Astronomical Society, 487(4), 4603 - 4614. https://doi.org/10.1093/mnras/stz1404

We present the analysis of stellar binary microlensing event OGLE-2015-BLG-0060 based on observations obtained from 13 different telescopes. Intensive coverage of the anomalous parts of the light curve was achieved by automated follow-up observations... Read More about An analysis of binary microlensing event OGLE-2015-BLG-0060.

A Hot Saturn Orbiting an Oscillating Late Subgiant Discovered by TESS (2019)
Journal Article
Smalley. (2019). A Hot Saturn Orbiting an Oscillating Late Subgiant Discovered by TESS. Astronomical Journal, https://doi.org/10.3847/1538-3881/ab1488

We present the discovery of HD 221416 b, the first transiting planet identified by the Transiting Exoplanet Survey Satellite (TESS) for which asteroseismology of the host star is possible. HD 221416 b (HIP 116158, TOI-197) is a bright (V = 8.2 mag),... Read More about A Hot Saturn Orbiting an Oscillating Late Subgiant Discovered by TESS.

NGTS-5b: a highly inflated planet offering insights into the sub-Jovian desert (2019)
Journal Article
Smalley, B., Eigmüller, P., Chaushev, A., Gillen, E., Smith, A., D. Nielsen, L., Turner, O., Czismadia, S., Bayliss, D., Belardi, C., Bouchy, F., R. Burleigh, M., Cabrera, J., L. Casewell, S., Chazelas, B., F. Cooke, B., Erikson, A., T. Gänsicke, B., N. Günther, M., R. Goad, M., …J. Wheatley, P. (2019). NGTS-5b: a highly inflated planet offering insights into the sub-Jovian desert. Astronomy & Astrophysics, 625, Article A142. https://doi.org/10.1051/0004-6361/201935206

Context: Planetary population analysis gives us insight into formation and evolution processes. For short-period planets, the subJovian desert has been discussed in recent years with regard to the planet population in the mass/period and radius/perio... Read More about NGTS-5b: a highly inflated planet offering insights into the sub-Jovian desert.

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.

SpUpNIC (Spectrograph Upgrade: Newly Improved Cassegrain): a versatile and efficient low- to medium-resolution, long-slit spectrograph on the South African Astronomical Observatory's 1.9-m telescope (2019)
Journal Article
Crause, L. A., Gilbank, D., van Gend, C., Worters, H. L., Sass, C., Kotze, E. J., Potter, S., Sickafoose, A., Sefako, R., Southworth, J., Macri, L., Thorstensen, J., Galan, C., Skelton, P., Engelbrecht, C., Braker, I., Winkler, H., Pieńkowski, D., Sürgit, D., Erdem, A., & Burleigh, M. (2019). SpUpNIC (Spectrograph Upgrade: Newly Improved Cassegrain): a versatile and efficient low- to medium-resolution, long-slit spectrograph on the South African Astronomical Observatory's 1.9-m telescope. Journal of Astronomical Telescopes, Instruments, and Systems (JATIS), 5(2), Article 024007. https://doi.org/10.1117/1.jatis.5.2.024007

We report on the extensively upgraded Cassegrain spectrograph on the South African Astronomical Observatory (SAAO) 1.9-m telescope. The introduction of new collimator and camera optics, a new detector and controller, a rear-of-slit viewing camera to... Read More about SpUpNIC (Spectrograph Upgrade: Newly Improved Cassegrain): a versatile and efficient low- to medium-resolution, long-slit spectrograph on the South African Astronomical Observatory's 1.9-m telescope.

Qatar Exoplanet Survey: Qatar-8b, 9b, and 10b—A Hot Saturn and Two Hot Jupiters (2019)
Journal Article
Alsubai, K., Tsvetanov, Z. I., Pyrzas, S., Latham, D. W., Bieryla, A., Eastman, J., Mislis, D., Esquerdo, G. A., Southworth, J., Mancini, L., Esamdin, A., Liu, J., Ma, L., Bretton, M., Pallé, E., Murgas, F., Vilchez, N. P., Parviainien, H., Montañes-Rodriguez, P., Narita, N., …Daassou, A. (2019). Qatar Exoplanet Survey: Qatar-8b, 9b, and 10b—A Hot Saturn and Two Hot Jupiters. Astronomical Journal, 157(6), 224 - 224. https://doi.org/10.3847/1538-3881/ab19bc

In this paper we present three new extrasolar planets from the Qatar Exoplanet Survey. Qatar-8b is a hot Saturn, with M P = 0.37 M J and R P = 1.3 R J, orbiting a solar-like star every P orb = 3.7 days. Qatar-9b is a hot Jupiter with a mass of M P =... Read More about Qatar Exoplanet Survey: Qatar-8b, 9b, and 10b—A Hot Saturn and Two Hot Jupiters.

OGLE-2018-BLG-0022: A Nearby M-dwarf Binary (2019)
Journal Article
Street, R., Bachelet, E., Tsapras, Y., Hundertmark, M., Bozza, V., Dominik, M., REA, R., Teams, M., Team, R., Bramich, D., Cassan, A., Horne, K., Mao, S., Saha, A., Wambsganss, J., Zang, W., Team, M., Jørgensen, U., Longa-Peña, P., Peixinho, N., …Tregloan-Reed, J. (2019). OGLE-2018-BLG-0022: A Nearby M-dwarf Binary. Astronomical Journal, 157(6), Article 215. https://doi.org/10.3847/1538-3881/ab1538

We report observations of the binary microlensing event OGLE-2018-BLG-0022, provided by the Robotic Observations of Microlensing Events (ROME)/Reactive Event Assessment (REA) Survey, which indicate that the lens is a low-mass binary star consisting o... Read More about OGLE-2018-BLG-0022: A Nearby M-dwarf Binary.

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.

The BEBOP radial-velocity survey for circumbinary planets I. Eight years of CORALIE observations of 47 single-line eclipsing binaries and abundance constraints on the masses of circumbinary planets (2019)
Journal Article
Hellier, & Maxted. (2019). The BEBOP radial-velocity survey for circumbinary planets I. Eight years of CORALIE observations of 47 single-line eclipsing binaries and abundance constraints on the masses of circumbinary planets. Astronomy and Astrophysics, https://doi.org/10.1051/0004-6361/201833669

We introduce the BEBOP radial velocity survey for circumbinary planets. We initiated this survey using the CORALIE spectrograph on the Swiss Euler Telescope at La Silla, Chile. An intensive four-year observation campaign commenced in 2013, targeting... Read More about The BEBOP radial-velocity survey for circumbinary planets I. Eight years of CORALIE observations of 47 single-line eclipsing binaries and abundance constraints on the masses of circumbinary planets.