Search Publications
Missions
Journals
Publication Years
Far-infrared to Millimeter Data of Protoplanetary Disks: Dust Growth in the Taurus, Ophiuchus, and Chamaeleon I Star-forming Regions
Bouy, Hervé; Naylor, David A.; Calvet, Nuria +7 more
Far-infrared and (sub)millimeter fluxes can be used to study dust in protoplanetary disks, the building blocks of planets. Here, we combine observations from the Herschel Space Observatory with ancillary data of 284 protoplanetary disks in the Taurus, Chamaeleon I, and Ophiuchus star-forming regions, covering from the optical to mm/cm wavelengths.…
The full spectral radiative properties of Proxima Centauri
Gregg, Michael D.; Bolmont, Emeline; Boyajian, Tabetha S. +1 more
Context. The discovery of Proxima b, a terrestrial temperate planet, presents the opportunity of studying a potentially habitable world in optimal conditions. A key aspect in the modeling of its habitability is to understand the radiation environment of the planet in the full spectral domain.
Aims: We aim to characterize the X-rays to mid-IR …
Broadband high-frequency waves detected at dipolarization fronts
Cao, J. B.; Yao, Z. H.; Fu, H. S. +3 more
Dipolarization front (DF) is a sharp boundary most probably separating the reconnection jet from the background plasma sheet. So far at this boundary, the observed waves are mainly in low-frequency range (e.g., magnetosonic waves and lower hybrid waves). Few high-frequency waves are observed in this region. In this paper, we report the broadband h…
Hierarchical Star Formation in Turbulent Media: Evidence from Young Star Clusters
Dale, D. A.; Calzetti, D.; Ryon, J. E. +16 more
We present an analysis of the positions and ages of young star clusters in eight local galaxies to investigate the connection between the age difference and separation of cluster pairs. We find that star clusters do not form uniformly but instead are distributed so that the age difference increases with the cluster pair separation to the 0.25-0.6 …
The resolved stellar populations around 12 Type IIP supernovae
Maund, Justyn R.
Core-collapse supernovae (SNe) are found in regions associated with recent massive star formation. The stellar population observed around the location of a SN can be used as a probe of the origins of the progenitor star. We apply a Bayesian mixture model to fit isochrones to the massive star population around 12 Type IIP SNe, for which constraints…
Dust-polarization Maps and Interstellar Turbulence
Kamionkowski, Marc; Caldwell, Robert R.; Hirata, Chris
Perhaps the most intriguing result of Planck’s dust-polarization measurements is the observation that the power in the E-mode polarization is twice that in the B mode, as opposed to pre-Planck expectations of roughly equal dust powers in the E and B modes. Here we show how the E- and B-mode powers depend on the detailed properties of the fluctuati…
NGC 6535: the lowest mass Milky Way globular cluster with a Na-O anti-correlation? Cluster mass and age in the multiple population context
Bragaglia, A.; D'Orazi, V.; Carretta, E. +4 more
To understand globular clusters (GCs) we need to comprehend how their formation process was able to produce their abundance distribution of light elements. In particular, we seek to figure out which stars imprinted the peculiar chemical signature of GCs. One of the best ways is to study the light-element anti-correlations in a large sample of GCs …
Surges and Si IV Bursts in the Solar Atmosphere: Understanding IRIS and SST Observations through RMHD Experiments
Martínez-Sykora, J.; Rouppe van der Voort, L.; Moreno-Insertis, F. +1 more
Surges often appear as a result of the emergence of magnetized plasma from the solar interior. Traditionally, they are observed in chromospheric lines such as Hα 6563 \mathringA and Ca II 8542 \mathringA . However, whether there is a response to the surge appearance and evolution in the Si IV lines or, in fact, in many other transition region line…
ALMA Reveals Sequential High-mass Star Formation in the G9.62+0.19 Complex
Kim, Kee-Tae; Li, Di; Liu, Tie +15 more
Stellar feedback from high-mass stars (e.g., H II regions) can strongly influence the surrounding interstellar medium and regulate star formation. Our new ALMA observations reveal sequential high-mass star formation taking place within one subvirial filamentary clump (the G9.62 clump) in the G9.62+0.19 complex. The 12 dense cores (MM1-MM12) detect…
Spatially resolved variations of the IMF mass normalization in early-type galaxies as probed by molecular gas kinematics
Davis, Timothy A.; McDermid, Richard M.
We here present the first spatially resolved study of the initial mass function (IMF) in external galaxies derived using a dynamical tracer of the mass-to-light ratio (M/L). We use the kinematics of relaxed molecular gas discs in seven early-type galaxies (ETGs) selected from the ATLAS3D survey to dynamically determine M/L gradients. Th…