Search Publications
A hot terrestrial planet orbiting the bright M dwarf L 168-9 unveiled by TESS
Bouchy, F.; de Medeiros, J. R.; Butler, R. P. +67 more
We report the detection of a transiting super-Earth-sized planet (R = 1.39 ± 0.09 R⊕) in a 1.4-day orbit around L 168-9 (TOI-134), a bright M1V dwarf (V = 11, K = 7.1) located at 25.15 ± 0.02 pc. The host star was observed in the first sector of the Transiting Exoplanet Survey Satellite (TESS) mission. For confirmation and planet mass m…
The single-sided pulsator CO Camelopardalis
Handler, G.; Vanderburg, A.; Giarrusso, M. +10 more
CO Cam (TIC 160268882) is the second 'single-sided pulsator' to be discovered. These are stars where one hemisphere pulsates with a significantly higher amplitude than the other side of the star. CO Cam is a binary star comprised of an Am δ Sct primary star with Teff = 7070 ± 150 K, and a spectroscopically undetected G main-sequence sec…
Age dating the Galactic bar with the nuclear stellar disc
Kawata, Daisuke; Baba, Junichi
From the decades of the theoretical studies, it is well known that the formation of the bar triggers the gas funnelling into the central sub-kpc region and leads to the formation of a kinematically cold nuclear stellar disc (NSD). We demonstrate that this mechanism can be used to identify the formation epoch of the Galactic bar, using an N-body/hy…
Performance Verification of the EXtreme PREcision Spectrograph
Ong, J. M. Joel; Fischer, Debra A.; Buchhave, Lars A. +22 more
The EXtreme PREcision Spectrograph (EXPRES) is a new Doppler spectrograph designed to reach a radial-velocity measurement precision sufficient to detect Earth-like exoplanets orbiting nearby, bright stars. We report on extensive laboratory testing and on-sky observations to quantitatively assess the instrumental radial-velocity measurement precisi…
Is π Men c’s Atmosphere Hydrogen-dominated? Insights from a Non-detection of H I Lyα Absorption
Rauer, H.; Gandolfi, D.; Fossati, L. +3 more
Constraining the composition of super-Earth-to-sub-Neptune-sized planets is a priority in order to understand the processes of planetary formation and evolution. π Men c represents a unique target for the atmospheric and compositional characterization of such planets because it is strongly irradiated and its bulk density is consistent with abundan…
Formation of the Musca filament: evidence for asymmetries in the accretion flow due to a cloud-cloud collision
Arzoumanian, D.; Schneider, N.; Csengeri, T. +11 more
Context. Dense molecular filaments are ubiquituous in the interstellar medium, yet their internal physical conditions and the role of gravity, turbulence, the magnetic field, radiation, and the ambient cloud during their evolution remain debated.
Aims: We study the kinematics and physical conditions in the Musca filament, the ambient cloud, a…
MUSE-ALMA haloes V: physical properties and environment of z ≤ 1.4 H I quasar absorbers
Pettini, Max; York, Donald G.; Hamanowicz, Aleksandra +11 more
We present results of the MUSE-ALMA haloes, an ongoing study of the circumgalactic medium (CGM) of low-redshift galaxies (z ≤ 1.4), currently comprising 14 strong H I absorbers in 5 quasar fields. We detect 43 galaxies associated with absorbers down to star formation rate (SFR) limits of 0.01-0.1 M⊙ yr-1, found within impact …
Double dark matter vision: twice the number of compact-source lenses with narrow-line lensing and the WFC3 grism
Brammer, G.; Treu, T.; Fassnacht, C. D. +9 more
The magnifications of compact-source lenses are extremely sensitive to the presence of low-mass dark matter haloes along the entire sightline from the source to the observer. Traditionally, the study of dark matter structure in compact-source strong gravitational lenses has been limited to radio-loud systems, as the radio emission is extended and …
The Splash without a Merger
Debattista, Victor P.; Amarante, João A. S.; Beraldo e Silva, Leandro +1 more
The Milky Way's progenitor experienced several merger events that left their imprints on the stellar halo, including the Gaia-Sausage/Enceladus. Recently, it has been proposed that this event perturbed the proto-disk and gave rise to a metal-rich ([Fe/H] > -1), low angular momentum (Vφ < 100 km s-1) stellar population. …
Unveiling the β Pictoris system, coupling high contrast imaging, interferometric, and radial velocity data
Genzel, R.; Henning, T.; Meunier, N. +85 more
Context. The nearby and young β Pictoris system hosts a well resolved disk, a directly imaged massive giant planet orbiting at ≃9 au, as well as an inner planet orbiting at ≃2.7 au, which was recently detected through radial velocity (RV). As such, it offers several unique opportunities for detailed studies of planetary system formation and early …