Search Publications
Determining the true mass of radial-velocity exoplanets with Gaia. Nine planet candidates in the brown dwarf or stellar regime and 27 confirmed planets
Lecavelier des Etangs, A.; Vidal-Madjar, A.; Kiefer, F. +3 more
Mass is one of the most important parameters for determining the true nature of an astronomical object. Yet, many published exoplanets lack a measurement of their true mass, in particular those detected as a result of radial-velocity (RV) variations of their host star. For those examples, only the minimum mass, or m sin i, is known, owing to the i…
The Carnegie Chicago Hubble Program X: Tip of the Red Giant Branch Distances to NGC 5643 and NGC 1404
Madore, Barry F.; Freedman, Wendy L.; Beaton, Rachael L. +7 more
The primary goal of the Carnegie Chicago Hubble Program (CCHP) is to calibrate the zero-point of the Type Ia supernova (SN Ia) Hubble Diagram through the use of Population II standard candles. So far, the CCHP has measured direct distances to 11 SNe Ia, and here we increase that number to 15 with two new Tip of the Red Giant Branch (TRGB) distance…
A highly non-Keplerian protoplanetary disc. Spiral structure in the gas disc of CQ Tau
Lodato, G.; Testi, L.; Facchini, S. +9 more
Context. In recent years high-angular-resolution observations have revealed that circumstellar discs appear in a variety of shapes with diverse substructures being ubiquitous. This has given rise to the question of whether these substructures are triggered by planet-disc interactions. Besides direct imaging, one of the most promising methods to di…
Supernova bounds on axionlike particles coupled with nucleons and electrons
Calore, Francesca; Carenza, Pierluca; Giannotti, Maurizio +3 more
We investigate the potential of type II supernovae (SNe) to constrain axionlike particles (ALPs) coupled simultaneously to nucleons and electrons. ALPs coupled to nucleons can be efficiently produced in the SN core via nucleon-nucleon bremsstrahlung and, for a wide range of parameters, leave the SN unhindered, producing a large ALP flux. For masse…
Revisiting the Cygnus OB associations
Quintana, Alexis L.; Wright, Nicholas J.
OB associations play an important role in Galactic evolution, though their origins and dynamics remain poorly studied, with only a small number of systems analysed in detail. In this paper, we revisit the existence and membership of the Cygnus OB associations. We find that of the historical OB associations only Cyg OB2 and OB3 stand out as real gr…
On the compressive nature of turbulence driven by ionizing feedback in the pillars of the Carina Nebula
Federrath, Christoph; Reiter, Megan; Klaassen, Pamela +2 more
The ionizing radiation of massive stars sculpts the surrounding neutral gas into pillar-like structures. Direct signatures of star formation through outflows and jets are observed in these structures, typically at their tips. Recent numerical simulations have suggested that this star formation could potentially be triggered by photoionizing radiat…
Evolution of the galaxy stellar mass function: evidence for an increasing M* from z = 2 to the present day
Häußler, B.; Bowler, R. A. A.; Jarvis, M. J. +2 more
Utilizing optical and near-infrared broad-band photometry covering >5 deg2 in two of the most well-studied extragalactic legacy fields (COSMOS and XMM-LSS), we measure the galaxy stellar mass function (GSMF) between 0.1 < z < 2.0. We explore in detail the effect of two source extraction methods (SExtractor and ProFound) in addi…
Disequilibrium Chemistry in Exoplanet Atmospheres Observed with the Hubble Space Telescope
West, Robert A.; Zellem, Robert T.; Swain, Mark R. +3 more
Literature on the theory of exoplanet atmospheric disequilibrium chemistry is rich, although its observational counterpart has yet to emerge beyond the hints provided by a few targets in dedicated studies. We report results from an uniform data reduction and analysis for a catalog of 62 Hubble Space Telescope exoplanet transit spectra where we ass…
Investigating the Relative Gas and Small Dust Grain Surface Heights in Protoplanetary Disks
Monnier, John D.; Adams, Fred C.; Teague, Richard +7 more
Dust evolution in protoplanetary disks from small dust grains to pebbles is key to the planet formation process. The gas in protoplanetary disks should influence the vertical distribution of small dust grains (∼1 µm) in the disk. Utilizing archival near-infrared polarized light and millimeter observations, we can measure the scale height and…
Magnetic Structure and Propagation of Two Interacting CMEs From the Sun to Saturn
Provan, Gabrielle; Möstl, Christian; Futaana, Yoshifumi +14 more
One of the grand challenges in heliophysics is the characterization of coronal mass ejection (CME) magnetic structure and evolution from eruption at the Sun through heliospheric propagation. At present, the main difficulties are related to the lack of direct measurements of the coronal magnetic fields and the lack of 3D in-situ measurements of the…