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.

A search for radius inflation among active M-dwarfs in Praesepe (2018)
Journal Article
Jackson, R. J., Jeffries, R. D., Deliyannis, C. P., Sun, Q., & Douglas, S. T. (2019). A search for radius inflation among active M-dwarfs in Praesepe. Monthly Notices of the Royal Astronomical Society, 483(1), 1125-1138. https://doi.org/10.1093/mnras/sty3184

Rotation periods from Kepler K2 are combined with projected rotation velocities from the WIYN 3.5-m telescope, to determine projected radii for fast-rotating, low-mass ($0.15 \leq M/M_{\odot} \leq 0.6$) members of the Praesepe cluster. A maximum like... Read More about A search for radius inflation among active M-dwarfs in Praesepe.

The Gaia-ESO Survey: the origin and evolution of s-process elements (2018)
Journal Article
Jeffries. (2018). The Gaia-ESO Survey: the origin and evolution of s-process elements. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/201832841

Context. Several works have found an increase of the abundances of the s-process neutron-capture elements in the youngest Galactic stellar populations. These trends provide important constraints on stellar and Galactic evolution and they need to be c... Read More about The Gaia-ESO Survey: the origin and evolution of s-process elements.

The Gaia DR2 view of the Gamma Velorum cluster: resolving the 6D structure (2018)
Journal Article
Franciosini, E., Sacco, G., Jeffries, R., Damiani, F., Roccatagliata, V., Fedele, D., & Randich, S. (2018). The Gaia DR2 view of the Gamma Velorum cluster: resolving the 6D structure. Astronomy & Astrophysics, 616, L12. https://doi.org/10.1051/0004-6361/201833815

Gaia-ESO Survey observations of the young Gamma Velorum cluster led to the discovery of two kinematically distinct populations, Gamma Vel A and B, respectively, with population B extended over several square degrees in the Vela OB2 association. Using... Read More about The Gaia DR2 view of the Gamma Velorum cluster: resolving the 6D structure.

The low mass population of the Vela OB2 association from Gaia (2018)
Journal Article
Armstrong, J. J., Jeffries, R. D., & Wright, N. J. (2018). The low mass population of the Vela OB2 association from Gaia. Monthly Notices of the Royal Astronomical Society: Letters, 480(1), L121–L125. https://doi.org/10.1093/mnrasl/sly137

The first Gaia Data Release presents an opportunity to characterise the low-mass population of OB associations, providing larger statistical samples and better constraints on the formation and evolution of clusters and associations. Using previously... Read More about The low mass population of the Vela OB2 association from Gaia.

The Gaia-ESO Survey: a kinematical and dynamical study of four young open clusters (2018)
Journal Article
Jeffries, R., Jackson, R., & Wright, N. (2018). The Gaia-ESO Survey: a kinematical and dynamical study of four young open clusters. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/201832645

Context
The origin and dynamical evolution of star clusters is an important topic in stellar astrophysics. Several models have been proposed in order to understand the formation of bound and unbound clusters and their evolution, and they can be test... Read More about The Gaia-ESO Survey: a kinematical and dynamical study of four young open clusters.

The inflated radii of M-dwarfs in the Pleiades (2018)
Journal Article
Jackson, R. J., Deliyannis, C. P., & Jeffries, R. D. (2018). The inflated radii of M-dwarfs in the Pleiades. Monthly Notices of the Royal Astronomical Society, 476(3), 3245-3262. https://doi.org/10.1093/mnras/sty374

Rotation periods obtained with the Kepler satellite have been combined with precise measurements of projected rotation velocity from the WIYN 3.5-m telescope to determine the distribution of projected radii for several hundred low-mass (0.1 6 M/M? 6... Read More about The inflated radii of M-dwarfs in the Pleiades.

The Gaia-ESO Survey: open clusters in Gaia-DR1. A way forward to stellar age calibration (2018)
Journal Article
Randich, S., Tognelli, E., Jackson, R., Jeffries, R., Degl’Innocenti, S., Pancino, E., Re Fiorentin, P., Spagna, A., Sacco, G., Bragaglia, A., Magrini, L., Prada Moroni, P., Alfaro, E., Franciosini, E., Morbidelli, L., Roccatagliata, V., Bouy, H., Bravi, L., Jiménez-Esteban, F., Jordi, C., …Zaggia, S. (2018). The Gaia-ESO Survey: open clusters in Gaia-DR1. A way forward to stellar age calibration. Astronomy and Astrophysics, 612, Article A99. https://doi.org/10.1051/0004-6361/201731738

Context
Determination and calibration of the ages of stars, which heavily rely on stellar evolutionary models, are very challenging, while representing a crucial aspect in many astrophysical areas.

Aims
We describe the methodologies that, taking... Read More about The Gaia-ESO Survey: open clusters in Gaia-DR1. A way forward to stellar age calibration.

The Gaia_ESO Survey: double, triple and quadruple-line spectroscopic binary candidates (2017)
Journal Article
Jeffries. (2017). The Gaia_ESO Survey: double, triple and quadruple-line spectroscopic binary candidates. Astronomy and Astrophysics, https://doi.org/10.1051/0004-6361/201730442

Context. The Gaia-ESO Survey (GES) is a large spectroscopic survey that provides a unique opportunity to study the distribution of spectroscopic multiple systems among different populations of the Galaxy. Aims. Our aim is to detect binarity/multiplic... Read More about The Gaia_ESO Survey: double, triple and quadruple-line spectroscopic binary candidates.

The Gaia-ESO Survey and CSI 2264: Substructures, disks, and sequential star formation in the young open cluster NGC 2264 (2017)
Journal Article
Jeffries. (2017). The Gaia-ESO Survey and CSI 2264: Substructures, disks, and sequential star formation in the young open cluster NGC 2264. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/201731103

Context. Reconstructing the structure and history of young clusters is pivotal to understanding the mechanisms and timescales of early stellar evolution and planet formation. Recent studies suggest that star clusters often exhibit a hierarchical stru... Read More about The Gaia-ESO Survey and CSI 2264: Substructures, disks, and sequential star formation in the young open cluster NGC 2264.

Searching for new young stars in the northern hemisphere: The Pisces Moving Group (2017)
Journal Article
Binks, A., Jeffries, R., & Ward, J. (2018). Searching for new young stars in the northern hemisphere: The Pisces Moving Group. Monthly Notices of the Royal Astronomical Society, 473(2), 2465-2485. https://doi.org/10.1093/mnras/stx2252

Using the kinematically unbiased technique described in Binks, Jeffries & Maxted (2015), we present optical spectra for a further 122 rapidly-rotating (rotation periods <6 days), X-ray active FGK stars, selected from the SuperWASP survey. We identify...

Gaia-ESO Survey: Global properties of clusters Trumpler 14 and 16 in the Carina nebula (2017)
Journal Article
Damiani, F., Klutsch, A., Jeffries, R., Randich, S., Prisinzano, L., Maíz Apellániz, J., Micela, G., Kalari, V., Frasca, A., Zwitter, T., Bonito, R., Gilmore, G., Flaccomio, E., Francois, P., Koposov, S., Lanzafame, A., Sacco, G., Bayo, A., Carraro, G., Casey, A., …Zaggia, S. (2017). Gaia-ESO Survey: Global properties of clusters Trumpler 14 and 16 in the Carina nebula. Astronomy & Astrophysics, 603, Article A81. https://doi.org/10.1051/0004-6361/201629020

Aims. We present the first extensive spectroscopic study of the global population in star clusters Trumpler 16, Trumpler 14, and Collinder 232 in the Carina nebula, using data from the Gaia-ESO Survey, down to solar-mass stars. Methods. In addition t... Read More about Gaia-ESO Survey: Global properties of clusters Trumpler 14 and 16 in the Carina nebula.

Multiple kinematical populations in Vela OB2 from Gaia DR1 data (2017)
Journal Article
Damiani, F., Prisinzano, L., Jeffries, R., Sacco, G., Randich, S., & Micela, G. (2017). Multiple kinematical populations in Vela OB2 from Gaia DR1 data. Astronomy and Astrophysics, 602, L1 - L1. https://doi.org/10.1051/0004-6361/201730867

Context. Recent results using radial-velocity measurements from the Gaia-ESO Survey have led to the discovery of multiple kinematic populations across the Vela OB2 association. We present here a proper-motion study of the same region.
Aims. Our aim... Read More about Multiple kinematical populations in Vela OB2 from Gaia DR1 data.

The Gaia-ESO Survey: dynamical models of flattened, rotating globular clusters (2017)
Journal Article
Jeffreson, S., Sanders, J., Evans, N., Williams, A., Gilmore, G., Bayo, A., Bragaglia, A., Casey, A., Flaccomio, E., Franciosini, E., Hourihane, A., Jackson, R. J., Jeffries, R. D., Jofré, P., Koposov, S., Lardo, C., Lewis, J., Magrini, L., Morbidelli, L., Pancino, E., …Zaggia, S. (2017). The Gaia-ESO Survey: dynamical models of flattened, rotating globular clusters. Monthly Notices of the Royal Astronomical Society, 469(4), 4740 -4762. https://doi.org/10.1093/mnras/stx1152

We present a family of self-consistent axisymmetric rotating globular cluster models which are fitted to spectroscopic data for NGC 362, NGC 1851, NGC 2808, NGC 4372, NGC 5927 and NGC 6752 to provide constraints on their physical and kinematic proper... Read More about The Gaia-ESO Survey: dynamical models of flattened, rotating globular clusters.

The Gaia-ESO Survey: Structural and dynamical properties of the young cluster Chamaeleon I (2017)
Journal Article
Sacco, G., Spina, L., Randich, S., Palla, F., Parker, R., Jeffries, R., Jackson, R., Meyer, M., Mapelli, M., Lanzafame, A., Bonito, R., Damiani, F., Franciosini, E., Frasca, A., Klutsch, A., Prisinzano, L., Tognelli, E., Degl’Innocenti, S., Prada Moroni, P., Alfaro, E., …Zaggia, S. (2017). The Gaia-ESO Survey: Structural and dynamical properties of the young cluster Chamaeleon I. Astronomy and Astrophysics, 601, https://doi.org/10.1051/0004-6361/201629698

Investigating the physical mechanisms driving the dynamical evolution of young star clusters is fundamental to our understanding of the star formation process and the properties of the Galactic field stars. The young (~2 Myr) and partially embedded c... Read More about The Gaia-ESO Survey: Structural and dynamical properties of the young cluster Chamaeleon I.

The Gaia-ESO Survey: the present-day radial metallicity distribution of the Galactic disc probed by pre-main-sequence clusters ??? (2017)
Journal Article
Jeffries. (2017). The Gaia-ESO Survey: the present-day radial metallicity distribution of the Galactic disc probed by pre-main-sequence clusters ???. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/201630078

Context. The radial metallicity distribution in the Galactic thin disc represents a crucial constraint for modelling disc formation and evolution. Open star clusters allow us to derive both the radial metallicity distribution and its evolution over t... Read More about The Gaia-ESO Survey: the present-day radial metallicity distribution of the Galactic disc probed by pre-main-sequence clusters ???.

A WISE-based search for debris discs amongst M-dwarfs in nearby, young, moving groups (2017)
Journal Article
Binks, A. S., & Jeffries, R. (2017). A WISE-based search for debris discs amongst M-dwarfs in nearby, young, moving groups. Monthly Notices of the Royal Astronomical Society, 496(1), 579-593. https://doi.org/10.1093/mnras/stx838

We present a search for debris discs amongst M-dwarf members of nearby, young (5–150 Myr) moving groups (MGs) using infrared (IR) photometry, primarily from the Wide Infrared Survey Explorer (WISE). A catalogue of 100 MG M dwarfs that have suitable W... Read More about A WISE-based search for debris discs amongst M-dwarfs in nearby, young, moving groups.

The Gaia-ESO Survey: the inner disk, intermediate-age open cluster Trumpler 23 (2017)
Journal Article
Jeffries. (2017). The Gaia-ESO Survey: the inner disk, intermediate-age open cluster Trumpler 23. Astronomy and Astrophysics, https://doi.org/10.1051/0004-6361/201629345

Context. Trumpler 23 is a moderately populated, intermediate-age open cluster within the solar circle at a RGC ~ 6 kpc. It is in a crowded field very close to the Galactic plane and the color–magnitude diagram shows significant field contamination an... Read More about The Gaia-ESO Survey: the inner disk, intermediate-age open cluster Trumpler 23.

The Gaia-ESO Survey: revisiting the Li-rich giant problem (2016)
Journal Article
Casey, A., Ruchti, G., Masseron, T., Randich, S., Gilmore, G., Lind, K., Kennedy, G., Koposov, S., Hourihane, A., Franciosini, E., Lewis, J., Magrini, L., Morbidelli, L., Sacco, G., Worley, C., Feltzing, S., Jeffries, R., Vallenari, A., Bensby, T., Bragaglia, A., …Valentini, M. (2016). The Gaia-ESO Survey: revisiting the Li-rich giant problem. Monthly Notices of the Royal Astronomical Society, 461(3), 3336 - 3352. https://doi.org/10.1093/mnras/stw1512

The discovery of lithium-rich giants contradicts expectations from canonical stellar evolution. Here we report on the serendipitous discovery of 20 Li-rich giants observed during the Gaia-ESO Survey, which includes the first nine Li-rich giant stars... Read More about The Gaia-ESO Survey: revisiting the Li-rich giant problem.

The Gaia-ESO Survey: Lithium depletion in the Gamma Velorum cluster and inflated radii in low-mass pre-main-sequence stars (2016)
Journal Article
Jeffries. (2016). The Gaia-ESO Survey: Lithium depletion in the Gamma Velorum cluster and inflated radii in low-mass pre-main-sequence stars. Monthly Notices of the Royal Astronomical Society, 1456-1465. https://doi.org/10.1093/mnras/stw2458

We show that non-magnetic models for the evolution of pre-main-sequence (PMS) stars cannot simultaneously describe the colour–magnitude diagram (CMD) and the pattern of lithium depletion seen in the cluster of young, low-mass stars surrounding ?2 Vel... Read More about The Gaia-ESO Survey: Lithium depletion in the Gamma Velorum cluster and inflated radii in low-mass pre-main-sequence stars.