Search Publications
Spectral Variability of VHS J1256-1257b from 1 to 5 µm
Kataria, Tiffany; Apai, Dániel; Zhou, Yifan +4 more
Multiwavelength time-resolved observations of rotationally modulated variability from brown dwarfs and giant exoplanets are the most effective method for constraining their heterogeneous atmospheric structures. In a companion paper, we reported the discovery of strong near-infrared variability in HST/WFC3/G141 light curves of the very red L-dwarf …
A precise architecture characterization of the π Mensae planetary system
Bouchy, F.; Rebolo, R.; Pallé, E. +97 more
Context. The bright star π Men was chosen as the first target for a radial velocity follow-up to test the performance of ESPRESSO, the new high-resolution spectrograph at the European Southern Observatory's Very Large Telescope. The star hosts a multi-planet system (a transiting 4 M⊕ planet at ~0.07 au and a sub-stellar companion on a ~…
Detection and Characterization of Oscillating Red Giants: First Results from the TESS Satellite
Barclay, Thomas; Chaplin, William J.; Davies, Guy R. +78 more
Since the onset of the "space revolution" of high-precision high-cadence photometry, asteroseismology has been demonstrated as a powerful tool for informing Galactic archeology investigations. The launch of the NASA Transiting Exoplanet Survey Satellite (TESS) mission has enabled seismic-based inferences to go full sky—providing a clear advantage …
MUSE view of Arp220: Kpc-scale multi-phase outflow and evidence for positive feedback
Maiolino, R.; Colina, L.; Perna, M. +9 more
Context. Arp220 is the nearest and prototypical ultra-luminous infrared galaxy; it shows evidence of pc-scale molecular outflows in its nuclear regions and strongly perturbed ionised gas kinematics on kpc scales. It is therefore an ideal system for investigating outflow mechanisms and feedback phenomena in detail.
Aims: We investigate the fee…
Gap, shadows, spirals, and streamers: SPHERE observations of binary-disk interactions in GG Tauri A
Lodato, G.; Pinte, C.; Ménard, F. +31 more
Context. A large portion of stars is found to be part of binary or higher-order multiple systems. The ubiquity of planets found around single stars raises the question of whether and how planets in binary systems form. Protoplanetary disks are the birthplaces of planets, and characterizing them is crucial in order to understand the planet formatio…
The Pristine Inner Galaxy Survey (PIGS) II: Uncovering the most metal-poor populations in the inner Milky Way
Lewis, Geraint F.; Cohen, Roger E.; Simpson, Jeffrey D. +19 more
Metal-poor stars are important tools for tracing the early history of the Milky Way, and for learning about the first generations of stars. Simulations suggest that the oldest metal-poor stars are to be found in the inner Galaxy. Typical bulge surveys, however, lack low metallicity ( $\rm {[Fe/H]} \lt -1.0$ ) stars because the inner Galaxy is pred…
Photometry of high-redshift blended galaxies using deep learning
Castellano, Marco; Huertas-Company, Marc; Merlin, Emiliano +12 more
The new generation of deep photometric surveys requires unprecedentedly precise shape and photometry measurements of billions of galaxies to achieve their main science goals. At such depths, one major limiting factor is the blending of galaxies due to line-of-sight projection, with an expected fraction of blended galaxies of up to 50 per cent. Thi…
Emergence of an Ultrared, Ultramassive Galaxy Cluster Core at z = 4
Ivison, R. J.; Casey, Caitlin M.; Long, Arianna S. +6 more
Recent simulations and observations of massive galaxy cluster evolution predict that the majority of stellar mass buildup happens within cluster members by z = 2, before cluster virialization. Protoclusters rich with dusty, star-forming galaxies (DSFGs) at z > 3 are the favored candidate progenitors for these massive galaxy clusters at z ∼ 0. W…
Strong Variability of Martian Water Ice Clouds During Dust Storms Revealed From ExoMars Trace Gas Orbiter/NOMAD
Vandaele, Ann Carine; Aoki, Shohei; Thomas, Ian +12 more
Observations of water ice clouds and aerosols on Mars can provide important insights into the complexity of the water cycle. Recent observations have indicated an important link between dust activity and the water cycle, as intense dust activity can significantly raise the hygropause, and subsequently increase the escape of water after dissociatio…
Peter Pan Disks: Long-lived Accretion Disks Around Young M Stars
Debes, John H.; Kuchner, Marc J.; Wisniewski, John P. +11 more
WISEA J080822.18-644357.3, an M star in the Carina association, exhibits extreme infrared excess and accretion activity at an age greater than the expected accretion disk lifetime. We consider J0808 as the prototypical example of a class of M star accretion disks at ages ≳20 Myr, which we call "Peter Pan" disks, because they apparently refuse to g…