Search Publications
SN 2015bh: NGC 2770's 4th supernova or a luminous blue variable on its way to a Wolf-Rayet star?
Campana, S.; Bauer, F. E.; Morrell, N. +13 more
Very massive stars in the final phases of their lives often show unpredictable outbursts that can mimic supernovae, so-called, "SN impostors", but the distinction is not always straightforward. Here we present observations of a luminous blue variable (LBV) in NGC 2770 in outburst over more than 20 yr that experienced a possible terminal explosion …
SPICAM on Mars Express: A 10 year in-depth survey of the Martian atmosphere
Gondet, B.; Vandaele, A. C.; Reberac, A. +24 more
The SPICAM experiment onboard Mars Express has accumulated during the last decade a wealth of observations that has permitted a detailed characterization of the atmospheric composition and activity from the near-surface up to above the exosphere. The SPICAM climatology is one of the longest assembled to date by an instrument in orbit around Mars, …
Cross-correlating Planck CMB lensing with SDSS: lensing-lensing and galaxy-lensing cross-correlations
Brownstein, Joel R.; Mandelbaum, Rachel; Singh, Sukhdeep
We present results from cross-correlating Planck cosmic microwave background (CMB) lensing maps with the Sloan Digital Sky Survey (SDSS) galaxy lensing shape catalogue and BOSS (Baryon Oscillation Spectroscopic Survey) galaxy catalogues. For galaxy position versus CMB lensing cross-correlations, we measure the convergence signal around the galaxie…
The Fraction of Stars That Form in Clusters in Different Galaxies
Whitmore, Bradley C.; Fall, S. Michael; Chandar, Rupali +1 more
We estimate the fraction of stars that form in compact clusters (bound and unbound), {{{Γ }}}F, in a diverse sample of eight star-forming galaxies, including two irregulars, two dwarf starbursts, two spirals, and two mergers. The average value for our sample is {{{Γ }}}F≈ 24 % +/- 9 % . We also calculate the fraction of stars…
Far-infrared metallicity diagnostics: application to local ultraluminous infrared galaxies
Farrah, D.; Rigopoulou, D.; Lebouteiller, V. +2 more
The abundance of metals in galaxies is a key parameter that permits to distinguish between different galaxy formation and evolution models. Most of the metallicity determinations are based on optical line ratios. However, the optical spectral range is subject to dust extinction and, for high-z objects (z > 3), some of the lines used in optical …
Resolved spectrophotometric properties of the Ceres surface from Dawn Framing Camera images
Russell, C. T.; Jaumann, R.; Mottola, S. +9 more
We present a global spectrophotometric characterization of the Ceres surface using Dawn Framing Camera (FC) images. We identify the photometric model that yields the best results for photometrically correcting images. Corrected FC images acquired on approach to Ceres were assembled into global maps of albedo and color. Generally, albedo and color …
Asphericity, Interaction, and Dust in the Type II-P/II-L Supernova 2013EJ in Messier 74
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Wang, Lifan +6 more
SN 2013ej is a well-studied core-collapse supernova (SN) that stemmed from a directly identified red supergiant (RSG) progenitor in galaxy M74. The source exhibits signs of substantial geometric asphericity, X-rays from persistent interaction with circumstellar material (CSM), thermal emission from warm dust, and a light curve that appears interme…
An Optical/Near-infrared Investigation of HD 100546 b with the Gemini Planet Imager and MagAO
Esposito, Thomas M.; Oppenheimer, Rebecca; Wolff, Schuyler G. +52 more
We present H band spectroscopic and Hα photometric observations of HD 100546 obtained with the Gemini Planet Imager and the Magellan Visible AO camera. We detect H band emission at the location of the protoplanet HD 100546 b, but show that the choice of data processing parameters strongly affects the morphology of this source. It appears point-lik…
The Old Host-galaxy Environment of SSS17a, the First Electromagnetic Counterpart to a Gravitational-wave Source
Rest, A.; Foley, R. J.; Boutsia, K. +16 more
We present an analysis of the host-galaxy environment of Swope Supernova Survey 2017a (SSS17a), the discovery of an electromagnetic counterpart to a gravitational-wave source, GW170817. SSS17a occurred 1.9 kpc (in projection; 10.″2) from the nucleus of NGC 4993, an S0 galaxy at a distance of 40 Mpc. We present a Hubble Space Telescope (HST) pre-tr…
The Herschel Exploitation of Local Galaxy Andromeda (HELGA). VII. A SKIRT radiative transfer model and insights on dust heating
Blommaert, J. A. D. L.; Boquien, M.; Fritz, J. +17 more
The radiation from stars heats dust grains in the diffuse interstellar medium and in star-forming regions in galaxies. Modelling this interaction provides information on dust in galaxies, a vital ingredient for their evolution. It is not straightforward to identify the stellar populations heating the dust, and to link attenuation to emission on a …