Search Publications
Observed kinematics of the Milky Way nuclear stellar disk region
Zoccali, M.; Rojas-Arriagada, A.; Valenti, E. +3 more
Context. The nuclear region of the Milky Way, within approximately −1° < l < +1° and −0.3° < b < +0.3° (i.e., |l|< 150 pc, |b|< 45 pc), is believed to host a nuclear stellar disk, co-spatial with the gaseous central molecular zone. Previous kinematical studies detected faster rotation for the stars belonging to the nuclear stella…
A Data-driven Spectral Model of Main-sequence Stars in Gaia DR3
Bedell, Megan; Angelo, Isabel; Ness, Melissa +1 more
Precise spectroscopic classification of planet hosts is an important tool of exoplanet research at both the population and individual system level. In the era of large-scale surveys, data-driven methods offer an efficient approach to spectroscopic classification that leverages the fact that a subset of stars in any given survey has stellar propert…
WISDOM project - XVIII. Molecular gas distributions and kinematics of three megamaser galaxies
Greene, Jenny E.; Williams, Thomas G.; Cappellari, Michele +11 more
The co-evolution of galaxies and supermassive black holes (SMBHs) underpins our understanding of galaxy evolution, but different methods to measure SMBH masses have only infrequently been cross-checked. We attempt to identify targets to cross-check two of the most accurate methods, megamaser, and cold molecular gas dynamics. Three promising galaxi…
Photo-dynamical characterisation of the TOI-178 resonant chain. Exploring the robustness of transit-timing variations and radial velocity mass characterisations
Alonso, R.; Deleuil, M.; Erikson, A. +106 more
Context. The TOI-178 system consists of a nearby, late-K-dwarf with six transiting planets in the super-Earth to mini-Neptune regime, with radii ranging from to 2.9 R⊕ and orbital periods between 1.9 and 20.7 days. All the planets, but the innermost one, form a chain of Laplace resonances. The fine-tuning and fragility of such orbital c…
Asymmetric Drift Map of the Milky Way Disk Populations between 8 -16 kpc with LAMOST and Gaia datasets
Yang, Peng; Wang, Hai-Feng; Li, Xin +4 more
The application of asymmetric drift (AD) tomography across different populations provides valuable insights into the kinematics, dynamics, and rotation curves of the Galactic disk. By leveraging common stars identified in both the LAMOST and Gaia surveys, alongside Gaia DR3's circular velocity curve, we conducted a qualitative exploration of asymm…
Study of the optical to X-ray broad emission lines of Mrk 110
Kriss, G. A.; Costantini, E.; Ebrero, J. +7 more
Aims: In order to shed light on the characteristics of the broad line region (BLR) in a narrow-line Seyfert 1 galaxy, we present an analysis of X-ray, UV, and optical spectroscopic observations of the broad emission lines in
Methods: For the broad-band modelling of the emission-line luminosity, we adopt the "l…
Optical spectroscopic and photometric classification of the X-ray transient EP240309a (EP J115415.8-501810) as an intermediate polar
Scaringi, S.; Monageng, I. M.; Buckley, David A. H. +13 more
We report on optical follow-up observations of an X-ray source initially detected by the Einstein Probe mission. Our investigations categorize the source as an intermediate polar, a class of magnetic cataclysmic variables, exhibiting an orbital period of 3.7614(4) h and a white dwarf spin period of 3.97 min. The orbital period was identified throu…
Obliquity Constraints for the Extremely Eccentric Sub-Saturn Kepler-1656 b
Huber, Daniel; Howard, Andrew W.; Petigura, Erik A. +25 more
The orbits of close-in exoplanets provide clues to their formation and evolutionary history. Many close-in exoplanets likely formed far out in their protoplanetary disks and migrated to their current orbits, perhaps via high-eccentricity migration (HEM), a process that can also excite obliquities. A handful of known exoplanets are perhaps caught i…
Probing the Relationship Between Early Star Formation and CO in the Dwarf Irregular Galaxy WLM with JWST
Windhorst, Rogier A.; Elmegreen, Bruce G.; Rubio, Monica +5 more
Wolf–Lundmark–Melotte (WLM) is a Local Group dwarf irregular (dIrr) galaxy with a metallicity 13% of solar. At 1 Mpc, the relative isolation of WLM provides a unique opportunity to investigate the internal mechanisms of star formation at low metallicities. The earliest stages of star formation in larger spirals occur in embedded clusters within mo…
Nuclear spin ratios of deuterated ammonia in prestellar cores. LAsMA observations of H-MM1 and Oph D
Belloche, A.; Wyrowski, F.; Caselli, P. +6 more
Context. Molecules containing two or more hydrogen or deuterium atoms have different nuclear spin states which behave as separate chemical species. The relative abundances of these species can give clues to their origin. Formation on grains is believed to yield statistical spin ratios whereas gas-phase reactions are predicted to result in clear de…