Search Publications
Zodiacal exoplanets in time - XIII. Planet orbits and atmospheres in the V1298 Tau system, a keystone in studies of early planetary evolution
Kuzuhara, M.; Tamura, M.; Kudo, T. +16 more
Studies of planetary systems of stars in star-forming regions and young clusters open a window on the formative stages of planetary evolution. We obtained high-cadence high-resolution infrared spectroscopy of the solar-mass Taurus association-member V1298 Tau during a transit of its 10R⊕-size 'b' planet. We measured the systemic radial …
Kinematics beats dust: unveiling nested substructure in the perturbed outer disc of the Milky Way
Laporte, Chervin F. P.; Belokurov, Vasily; Koposov, Sergey E.
We use the Gaia eDR3 data and legacy spectroscopic surveys to map the Milky Way disc substructure towards the Galactic Anticentre at heliocentric distances $d\ge 10\, \rm {kpc}$. We report the discovery of multiple previously undetected new filaments embedded in the outer disc in highly extincted regions. Stars in these overdensities have distance…
Constraints on star formation in NGC 2264
Parker, Richard J.; Schoettler, Christina
We quantify the spatial distribution of stars for two subclusters centred around the massive/intermediate-mass stars S Mon and IRS 1/2 in the NGC 2264 star-forming region. We find that both subclusters have neither a substructured nor a centrally concentrated distribution according to the $\mathcal {Q}$-parameter. Neither subcluster displays mass …
A hot and luminous source at the site of the fast transient AT2018cow at 2-3 yr after its explosion
Sun, Ning-Chen; Crowther, Paul A.; Maund, Justyn R. +1 more
We report the discovery of a luminous late-time source at the position of the fast blue optical transient AT2018cow on images taken by the Hubble Space Telescope at 714 d and 1136 d after its explosion. This source is detected at both UV and optical wavelengths and has prominent Hα emission. It has a very stable brightness between the two epochs a…
Multiply lensed star forming clumps in the A521-sys1 galaxy at redshift 1
Richard, Johan; Adamo, Angela; Combes, Françoise +5 more
We study the population of star-forming clumps in A521-sys1, a $z=1.04$ system gravitationally lensed by the foreground ($z=0.25$) cluster Abell 0521. The galaxy presents one complete counter-image with a mean magnification of $\rm \mu \sim 4$ and a wide arc containing two partial images of A521-sys1 with magnifications reaching $\mu > 20$, all…
The building up of observed stellar scaling relations of massive galaxies and the connection to black hole growth in the TNG50 simulation
Faber, S. M.; Huertas-Company, M.; Dekel, A. +7 more
We study how mock-observed stellar morphological and structural properties of massive galaxies are built up between $z$ = 0.5 and $z$ = 3 in the TNG50 cosmological simulation. We generate mock images with the properties of the CANDELS survey and derive Sersic parameters and optical rest-frame morphologies as usually done in the observations. Overa…
Turning points in the age-metallicity relations - created by late satellite infall and enhanced by radial migration
Ness, Melissa K.; Buck, Tobias; Lu, Yuxi Lucy +1 more
The present-day age-metallicity relation (AMR) is a record of the star formation history of galaxies, as this traces the chemical enrichment of the gas over time. We use a zoomed-in cosmological simulation that reproduces key signatures of the Milky Way (MW), g2.79e12 from the NIHAO-UHD project, to examine how stellar migration and satellite infal…
Stellar populations and star formation histories of the most extreme [O III] emitters at z = 1.3 - 3.7
Tang, Mengtao; Stark, Daniel P.; Ellis, Richard S.
As the James Webb Space Telescope approaches scientific operation, there is much interest in exploring the redshift range beyond that accessible with Hubble Space Telescope imaging. Currently, the only means to gauge the presence of such early galaxies is to age-date the stellar population of systems in the reionisation era. As a significant fract…
Planet Hunters TESS IV: a massive, compact hierarchical triple star system TIC 470710327
Aigrain, S.; Lee, S.; Escorza, A. +37 more
We report the discovery and analysis of a massive, compact, hierarchical triple system (TIC 470710327) initially identified by citizen scientists in data obtained by NASA's Transiting Exoplanet Survey Satellite (TESS). Spectroscopic follow-up observations obtained with the HERMES spectrograph, combined with eclipse-timing variations (ETVs), confir…
The Pristine survey - XV. A CFHT ESPaDOnS view on the Milky Way halo and disc populations
Jablonka, P.; Lardo, C.; Kordopatis, G. +14 more
We present a one-dimensional, local thermodynamic equilibrium homogeneous analysis of 132 stars observed at high resolution with ESPaDOnS. This represents the largest sample observed at high resolution (R ~ 40 000) from the Pristine survey. This sample is based on the first version of the Pristine catalogue and covers the full range of metalliciti…