Search Publications
The GOGREEN Survey: A deep stellar mass function of cluster galaxies at 1.0 < z < 1.4 and the complex nature of satellite quenching
Muzzin, Adam; Forrest, Ben; Gwyn, Stephen +28 more
We study the stellar mass functions (SMFs) of star-forming and quiescent galaxies in 11 galaxy clusters at 1.0 < z < 1.4 drawn from the Gemini Observations of Galaxies in Rich Early ENvironments (GOGREEN) survey. Based on more than 500 h of Gemini/GMOS spectroscopy and deep multi-band photometry taken with a range of observatories, we probe …
The Herschel view of the dense core population in the Ophiuchus molecular cloud
André, Ph.; Arzoumanian, D.; Könyves, V. +15 more
Context. Herschel observations of nearby clouds in the Gould Belt support a paradigm for low-mass star formation, starting with the generation of molecular filaments, followed by filament fragmentation, and the concentration of mass into self-gravitating prestellar cores. In the case of the Ophiuchus molecular complex, a rich star formation activi…
Relation of X-ray activity and rotation in M dwarfs and predicted time-evolution of the X-ray luminosity
Scholz, A.; Stelzer, B.; Covey, K. R. +3 more
The relation of activity to rotation in M dwarfs is of high astrophysical interest because it provides observational evidence of the stellar dynamo, which is poorly understood for low-mass stars, especially in the fully convective regime. Previous studies have shown that the relation of X-ray activity to rotation consists of two different regimes:…
A super-Earth and a sub-Neptune orbiting the bright, quiet M3 dwarf TOI-1266
Watson, A. M.; Bouchy, F.; Queloz, D. +70 more
We report the discovery and characterisation of a super-Earth and a sub-Neptune transiting the bright (K = 8.8), quiet, and nearby (37 pc) M3V dwarf TOI-1266. We validate the planetary nature of TOI-1266 b and c using four sectors of TESS photometry and data from the newly-commissioned 1-m SAINT-EX telescope located in San Pedro Mártir (México). W…
The Gaia-ESO survey: the non-universality of the age-chemical-clocks-metallicity relations in the Galactic disc
Baratella, M.; Gilmore, G.; Bayo, A. +36 more
Context. In the era of large spectroscopic surveys, massive databases of high-quality spectra coupled with the products of the Gaia satellite provide tools to outline a new picture of our Galaxy. In this framework, an important piece of information is provided by our ability to infer stellar ages, and consequently to sketch a Galactic timeline.
ALMA reveals a large structured disk and nested rotating outflows in DG Tauri B
Dougados, C.; Louvet, F.; Cabrit, S. +3 more
We present Atacama Large Millimeter Array (ALMA) Band 6 observations at 14-20 au spatial resolution of the disk and CO(2-1) outflow around the Class I protostar DG Tau B in Taurus. The disk is very large, both in dust continuum (Reff, 95% = 174 au) and CO (RCO = 700 au). It shows Keplerian rotation around a 1.1 ± 0.2 M⊙<…
The ESO supernovae type Ia progenitor survey (SPY). The radial velocities of 643 DA white dwarfs
Leibundgut, B.; Reimers, D.; Heber, U. +13 more
Close double degenerate binaries are one of the favoured progenitor channels for type Ia supernovae, but it is unclear how many suitable systems there are in the Galaxy. We report results of a large radial velocity survey for double degenerate (DD) binaries using the UVES spectrograph at the ESO VLT (ESO SN Ia Progenitor surveY - SPY). Exposures t…
A transition between the hot and the ultra-hot Jupiter atmospheres
Désert, Jean-Michel; Mansfield, Megan; Parmentier, Vivien +6 more
A key hypothesis in the field of exoplanet atmospheres is the trend of atmospheric thermal structure with planetary equilibrium temperature. We explore this trend and report here the first statistical detection of a transition in the near-infrared atmospheric emission between hot and ultra-hot Jupiters. We measure this transition using secondary e…
X-shooter survey of disk accretion in Upper Scorpius. I. Very high accretion rates at age > 5 Myr
Lodato, G.; Pascucci, I.; Fedele, D. +14 more
Determining the mechanisms that drive the evolution of protoplanetary disks is a necessary step toward understanding how planets form. For this work, we measured the mass accretion rate for young stellar objects with disks at age > 5 Myr, a critical test for the current models of disk evolution. We present the analysis of the spectra of 36 targ…
Disks Around T Tauri Stars with SPHERE (DARTTS-S). II. Twenty-one new polarimetric images of young stellar disks
van der Plas, G.; Quanz, S. P.; Avenhaus, H. +8 more
Context. Near-IR polarimetric images of protoplanetary disks enable us to characterize substructures that might be due to the interaction with (forming) planets. The available census is strongly biased toward massive disks around old stars, however.
Aims: The DARTTS program aims at alleviating this bias by imaging a large number of T Tauri st…