Search Publications
Glacial and gully erosion on Mars: A terrestrial perspective
Conway, Susan J.; Grindrod, Peter M.; Davis, Joel M. +3 more
The mid- to high latitudes of Mars host assemblages of landforms consistent with a receding glacial landscape on Earth. These landforms are postulated to have formed >5 Ma under a different climate regime when Mars' orbital obliquity was on average 10° higher than today. Here, we investigate the spatiotemporal relationship between gullies and g…
IRIS Observations of Spicules and Structures Near the Solar Limb
Vial, J. -C.; Alissandrakis, C. E.; Buchlin, E. +2 more
We have analyzed Interface Region Imaging Spectrograph (IRIS) spectral and slit-jaw observations of a quiet region near the South Pole. In this article we present an overview of the observations, the corrections, and the absolute calibration of the intensity. We focus on the average profiles of strong (Mg II h and k, C II and Si IV), as well as of…
A Systematic Study of Hale and Anti-Hale Sunspot Physical Parameters
Li, Jing
We present a systematic study of sunspot physical parameters using full-disk magnetograms from the Michelson Doppler Imager/Solar and Heliospheric Observatory and the Helioseismic and Magnetic Imager/Solar Dynamic Observatory. Our aim is to use uniform data sets and analysis procedures to characterize the sunspots, paying particular attention to t…
The 1989 and 2015 outbursts of V404 Cygni: a global study of wind-related optical features
Charles, P. A.; Armas Padilla, M.; Jiménez-Ibarra, F. +19 more
The black hole transient V404 Cygni exhibited a bright outburst in June 2015 that was intensively followed over a wide range of wavelengths. Our team obtained high time resolution optical spectroscopy (! ∼ ! 90 s), which included a detailed coverage of the most active phase of the event. We present a data base consisting of 651 optical spectra obt…
Cloud Atlas: Rotational Modulations in the L/T Transition Brown Dwarf Companion HN Peg B
Schneider, Glenn; Metchev, Stanimir; Apai, Dániel +11 more
Time-resolved observations of brown dwarfs’ rotational modulations provide powerful insights into the properties of condensate clouds in ultra-cool atmospheres. Multi-wavelength light curves reveal cloud vertical structures, condensate particle sizes, and cloud morphology, which directly constrain condensate cloud and atmospheric circulation model…
First scattered light detection of a nearly edge-on transition disk around the T Tauri star RY Lupi
Pinte, C.; Avenhaus, H.; Henning, T. +41 more
Context. Transition disks are considered sites of ongoing planet formation, and their dust and gas distributions could be signposts of embedded planets. The transition disk around the T Tauri star RY Lup has an inner dust cavity and displays a strong silicate emission feature.
Aims: Using high-resolution imaging we study the disk geometry, in…
Extinction Maps and Dust-to-gas Ratios in Nearby Galaxies with LEGUS
Schaerer, D.; Herrero, A.; Cignoni, M. +44 more
We present a study of the dust-to-gas ratios in five nearby galaxies: NGC 628 (M74), NGC 6503, NGC 7793, UGC 5139 (Holmberg I), and UGC 4305 (Holmberg II). Using Hubble Space Telescope broadband WFC3/UVIS UV and optical images from the Treasury program Legacy ExtraGalactic UV Survey (LEGUS) combined with archival HST/Advanced Camera for Surveys da…
Structure and kinematics of Type II Cepheids in the Galactic bulge based on near-infrared VVV data
Minniti, D.; Rejkuba, M.; Contreras Ramos, R. +5 more
Context. Type II Cepheids (T2Cs) are radially pulsating variables that trace old stellar populations and provide distance estimates through their period-luminosity (PL) relation.
Aims: We trace the structure of old stellar population in the Galactic bulge using new distance estimates and kinematic properties of T2Cs.
Methods: We present …
The First Year of S-CUBED: The Swift Small Magellanic Cloud Survey
Coe, M. J.; Kennea, J. A.; Evans, P. A. +2 more
The Swift Small Magellanic Cloud (SMC) Survey, S-CUBED, is a high-cadence shallow X-ray survey of the SMC. The survey consists of 142 tiled pointings covering the optical extent of the SMC, which is performed weekly by NASA’s Neil Gehrels Swift Observatory, with an exposure per tile of 60 s. The survey is focused on discovery and monitoring of X-r…
Quantifying the AGN-driven outflows in ULIRGs (QUADROS) III: measurements of the radii and kinetic powers of eight near-nuclear outflows
Tadhunter, C. N.; Rose, M.; Rodríguez Zaurín, J. +1 more
As part of the Quantifying ULIRG AGN-driven Outflows (QUADROS) project to quantify the impact of active galactic nuclei (AGN)-driven outflows in rapidly evolving galaxies in the local Universe, we present observations of eight nearby ultraluminous infrared galaxies (ULIRGs, 0.04 <z < 0.2) taken with the Intermediate-dispersion Spectrograph a…