Search Publications
Resolving 3D Disk Orientation Using High-resolution Images: New Constraints on Circumgalactic Gas Inflows
Martin, Crystal L.; Ho, Stephanie H.
We constrain gas inflow speeds in star-forming galaxies with color gradients consistent with inside-out disk growth. Our method combines new measurements of disk orientation with previously described circumgalactic absorption in background quasar spectra. Two quantities, a position angle and an axis ratio, describe the projected shape of each gala…
Inferred time-scales for common envelope ejection using wide astrometric companions
Igoshev, Andrei P.; Perets, Hagai B.; Michaely, Erez
Evolution of close binaries often proceeds through the common envelope stage. The physics of the envelope ejection (CEE) is not yet understood, and several mechanisms were suggested to be involved. These could give rise to different time-scales for the CEE mass-loss. In order to probe the CEE-time-scales we study wide companions to post-CE binarie…
Labyrinth terrain on Titan
Malaska, Michael J.; Lopes, Rosaly M. C.; Solomonidou, Anezina +14 more
The Cassini/Huygens mission revealed a terrain type on Saturn's moon Titan of dissected, elevated plateaux with a high density of valleys named labyrinth terrain. We define four subtypes of labyrinth terrains: valleyed, polygonal, finely-dissected, and the possible outlier Kronin Labyrinth. We mapped the locations of all labyrinths imaged by Cassi…
Discovery and characterization of the exoplanets WASP-148b and c. A transiting system with two interacting giant planets
Bouchy, F.; Deleuil, M.; Queloz, D. +39 more
We present the discovery and characterization of WASP-148, a new extrasolar system that includes at least two giant planets. The host star is a slowly rotating inactive late-G dwarf with a V = 12 magnitude. The planet WASP-148b is a hot Jupiter of 0.72 RJup and 0.29 MJup that transits its host with an orbital period of 8.80 d…
Heliospheric energetic neutral atoms: Non-stationary modelling and comparison with IBEX-Hi data
Izmodenov, V. V.; Alexashov, D. B.; Baliukin, I. I.
The interstellar boundary explorer (IBEX) has been measuring fluxes of the energetic neutral atoms (ENAs) using the IBEX-Hi (0.3-6 keV) instrument since 2008. We have developed a numerical time-depended code to calculate globally distributed flux (GDF) of hydrogen ENAs employing both (1) 3D kinetic-MHD model of the global heliosphere and (2) recon…
Star catalog position and proper motion corrections in asteroid astrometry II: The Gaia era
Eggl, Siegfried; Chesley, Steven R.; Farnocchia, Davide +1 more
Astrometric positions of moving objects in the Solar System have been measured using a variety of star catalogs in the past. Previous work has shown that systematic errors in star catalogs can affect the accuracy of astrometric observations. That, in turn, can influence the resulting orbit fits for minor planets. In order to quantify these systema…
Clustering with JWST: Constraining galaxy host halo masses, satellite quenching efficiencies, and merger rates at z = 4-10
Stark, Daniel P.; Endsley, Ryan; Rieke, Marcia +5 more
Galaxy clustering measurements can be used to constrain many aspects of galaxy evolution, including galaxy host halo masses, satellite quenching efficiencies, and merger rates. We simulate JWST galaxy clustering measurements at z ∼ 4-10 by utilizing mock galaxy samples produced by an empirical model, the UNIVERSEMACHINE. We also adopt the survey f…
Separation between RR Lyrae and type II Cepheids and their importance for a distance determination: the case of omega Cen
Salaris, M.; Mateo, M.; Marinoni, S. +11 more
The separation between RR Lyrae (RRLs) and type II Cepheid (T2Cs) variables based on their period is debated. Both types of variable stars are distance indicators, and we aim to promote the use of T2Cs as distance indicators in synergy with RRLs. We adopted new and existing optical and near-infrared (NIR) photometry of ω Cen to investigate several…
The Spectroscopic Follow-up of the QUBRICS Bright Quasar Survey
Grazian, Andrea; Boutsia, Konstantina; Amorin, Ricardo +11 more
We present the results of the spectroscopic follow-up of the QUasars as BRIght beacons for Cosmology in the Southern Hemisphere (QUBRICS; Calderone et al. 2019) survey. The selection method is based on a machine-learning approach applied to photometric catalogs, covering an area of ∼12,400 deg2 in the Southern Hemisphere. The spectrosco…
Forward Modeling of Double Neutron Stars: Insights from Highly Offset Short Gamma-Ray Bursts
Fong, Wen-fai; Zevin, Michael; Kalogera, Vicky +3 more
We present a detailed analysis of two well-localized, highly offset short gamma-ray bursts—GRB 070809 and GRB 090515—investigating the kinematic evolution of their progenitors from compact object formation until merger. Calibrating to observations of their most probable host galaxies, we construct semi-analytic galactic models that account for sta…