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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: Calibration strategy (2017)
Journal Article
Pancino, E., Lardo, C., Altavilla, G., Marinoni, S., Ragaini, S., Cocozza, G., Bellazzini, M., Sabbi, E., Zoccali, M., Donati, P., Heiter, U., Koposov, S. E., Blomme, R., Morel, T., Símon-Díaz, S., Lobel, A., Soubiran, C., Montalban, J., Valentini, M., Casey, A. R., …Koch, A. (2017). The Gaia-ESO Survey: Calibration strategy. Astronomy and Astrophysics, 598, A5. https://doi.org/10.1051/0004-6361/201629450

The Gaia-ESO survey (GES) is now in its fifth and last year of observations and has produced tens of thousands of high-quality spectra of stars in all Milky Way components. This paper presents the strategy behind the selection of astrophysical calibr... Read More about The Gaia-ESO Survey: Calibration strategy.

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.

The Gaia-ESO Survey: Pre-Main Sequence Stars in the Young Open Cluster NGC 3293 (2016)
Journal Article
Delgado, A., Sampedro, L., Alfaro, E., Costado, M., Yun, J., Frasca, A., Lanzafame, A., Drew, J., Eislöffel, J., Blomme, R., Morel, T., Lobel, A., Semaan, T., Randich, S., Jeffries, R., Micela, G., Vallenari, A., Kalari, V., Gilmore, G., Flaccomio, E., …Magrini, L. (2016). The Gaia-ESO Survey: Pre-Main Sequence Stars in the Young Open Cluster NGC 3293. Monthly Notices of the Royal Astronomical Society, 460(3), 3305-3315. https://doi.org/10.1093/mnras/stw1217

The young open cluster NGC3293 is included in the observing program of the Gaia-ESO survey (GES). The radial velocity values provided have been used to assign cluster membership probabilities by means of a single-variable parametric analysis. These m... Read More about The Gaia-ESO Survey: Pre-Main Sequence Stars in the Young Open Cluster NGC 3293.

The Gaia-ESO Survey: A lithium-rotation connection at 5 Myr? (2016)
Journal Article
Bouvier, J., Lanzafame, A., Venuti, L., Klutsch, A., Jeffries, R., Frasca, A., Moraux, E., Biazzo, K., Messina, S., Micela, G., Randich, S., Stauffer, J., Cody, A., Flaccomio, E., Gilmore, G., Bayo, A., Bensby, T., Bragaglia, A., Carraro, G., Casey, A., …Zwitter, T. (2016). The Gaia-ESO Survey: A lithium-rotation connection at 5 Myr?. Astronomy and Astrophysics, 590, Article A78. https://doi.org/10.1051/0004-6361/201628336

Context
The evolution of lithium abundance in cool dwarfs provides a unique probe of nonstandard processes in stellar evolution.

Aims
We investigate the lithium content of young low-mass stars in the 5 Myr old, star forming region NGC 2264 and i... Read More about The Gaia-ESO Survey: A lithium-rotation connection at 5 Myr?.

The Gaia-ESO Survey: membership and initial mass function of the. Velorum cluster (2016)
Journal Article
Jeffries. (2016). The Gaia-ESO Survey: membership and initial mass function of the. Velorum cluster. Astronomy & Astrophysics, https://doi.org/10.1051/0004-6361/201527875

Context. Understanding the properties of young open clusters, such as the initial mass function (IMF), star formation history, and dynamic evolution, is crucial for obtaining reliable theoretical predictions of the mechanisms involved in the star for... Read More about The Gaia-ESO Survey: membership and initial mass function of the. Velorum cluster.

The Gaia-ESO Survey: Dynamical analysis of the L1688 region in Ophiuchus (2016)
Journal Article
Jeffries, R., & Wright, N. J. (2016). The Gaia-ESO Survey: Dynamical analysis of the L1688 region in Ophiuchus. Astronomy and Astrophysics Supplement Series, https://doi.org/10.1051/0004-6361/201527253

The Gaia ESO Public Spectroscopic Survey (GES) is providing the astronomical community with high-precision measurements of many stellar parameters including radial velocities (RVs) of stars belonging to several young clusters and star-forming regions... Read More about The Gaia-ESO Survey: Dynamical analysis of the L1688 region in Ophiuchus.

The Gaia-ESO Survey: Stellar radii in the young open clusters NGC 2264, NGC 2547, and NGC 2516 (2016)
Journal Article
Jackson, R. J., Jeffries, R. D., Randich, S., Bragaglia, A., Carraro, G., Costado, M., Flaccomio, E., Lanzafame, A., Lardo, C., Monaco, L., Morbidelli, L., Smiljanic, R., & Zaggia, S. (2016). The Gaia-ESO Survey: Stellar radii in the young open clusters NGC 2264, NGC 2547, and NGC 2516. Astronomy and Astrophysics Supplement Series, 586, Article A52. https://doi.org/10.1051/0004-6361/201527507

Context. Rapidly rotating, low-mass members of eclipsing binary systems have measured radii that are significantly larger than predicted by standard evolutionary models. It has been proposed that magnetic activity is responsible for this radius infla... Read More about The Gaia-ESO Survey: Stellar radii in the young open clusters NGC 2264, NGC 2547, and NGC 2516.