Search Publications
Digging for Relics of the Past: The Ancient and Obscured Bulge Globular Cluster NGC 6256
Dalessandro, E.; Salaris, M.; Saracino, S. +5 more
We used a set of moderately deep and high-resolution optical observations obtained with the Hubble Space Telescope to investigate the properties of the stellar population in the heavily obscured bulge globular cluster (GC) NGC 6256. The analysis of the color-magnitude diagram (CMD) revealed a stellar population with an extended blue horizontal bra…
ALMA chemical survey of disk-outflow sources in Taurus (ALMA-DOT). I. CO, CS, CN, and H2CO around DG Tau B
Podio, L.; Bacciotti, F.; Fedele, D. +7 more
The chemical composition of planets is determined by the distribution of the various molecular species in the protoplanetary disk at the time of their formation. To date, only a handful of disks have been imaged in multiple spectral lines with high spatial resolution. As part of a small campaign devoted to the chemical characterization of disk-out…
SOFIA/HAWC+ Traces the Magnetic Fields in NGC 1068
Staguhn, Johannes; Ward-Thompson, Derek; Dowell, C. Darren +22 more
We report the first detection of galactic spiral structure by means of thermal emission from magnetically aligned dust grains. Our 89 µm polarimetric imaging of NGC 1068 with the High-resolution Airborne Wideband Camera/Polarimeter (HAWC+) on NASAs Stratospheric Observatory for Infrared Astronomy (SOFIA) also sheds light on magnetic field st…
The Mean Magnetic Field Strength of CI Tau
Johns-Krull, Christopher M.; Lee, Jae-Joon; Prato, L. +4 more
We present a blind comparison of two methods to measure the mean surface magnetic field strength of the classical T Tauri star CI Tau based on Zeeman broadening of sensitive spectral lines. Our approach takes advantage of the greater Zeeman broadening at near-infrared compared to optical wavelengths. We analyze a high signal-to-noise, high spectra…
TauREx3 PhaseCurve: A 1.5D Model for Phase-curve Description
Changeat, Q.; Al-Refaie, A.
In recent years, retrieval analysis of exoplanet atmospheres have been very successful, providing deep insights on the composition and the temperature structure of these worlds via transit and eclipse methods. Analysis of spectral phase-curve observations, which in theory provide even more information, are still limited to a few planets. In the ne…
Significant luminosity differences of two twin Type Ia supernovae
Filippenko, Alexei V.; Foley, Ryan J.; Riess, Adam G. +5 more
The Type Ia supernovae (SNe Ia) 2011by, hosted in NGC 3972, and 2011fe, hosted in M101, are optical 'twins,' having almost identical optical light-curve shapes, colours, and near-maximum-brightness spectra. However, SN 2011fe had significantly more ultraviolet (UV; 1600 < λ < 2500 Å) flux than SN 2011by before and at peak luminosity. Several…
Space Velocity and Time Span of Jets in Planetary Nebulae
Guerrero, Martín A.; Ortiz, Roberto; Suzett Rechy-García, Jackeline
Fast highly collimated outflows, including bipolar knots, jetlike features, and point-symmetric filaments or strings of knots, are common in planetary nebulae (PNe). These features, generally known as jets, are thought to play an active role in the nebular shaping immediately before or while fast stellar winds and D-type ionization fronts shock an…
The influence of NLTE effects in Fe I lines on an inverted atmosphere. I. 6301 Å and 6302 Å lines formed in 1D NLTE
Solanki, S. K.; van Noort, M.; Smitha, H. N. +1 more
Context. Ultraviolet overionisation of iron atoms in the solar atmosphere leads to deviations in their level populations based on Saha-Boltzmann statistics. This causes their line profiles to form in non-local thermodynamic equilibrium (NLTE) conditions. When inverting such profiles to determine atmospheric parameters, the NLTE effects are often n…
Connecting 3D Evolution of Coronal Mass Ejections to Their Source Regions
Pant, Vaibhav; Banerjee, Dipankar; Patel, Ritesh +1 more
Since coronal mass ejections (CMEs) are the major drivers of space weather, it is crucial to study their evolution starting from the inner corona. In this work we use graduated cylindrical shell model to study the 3D evolution of 59 CMEs in the inner (<3 R⊙) and outer (>3 R⊙) corona using observations from COR-1 and COR…
Search for Nearby Earth Analogs .III. Detection of 10 New Planets, 3 Planet Candidates, and Confirmation of 3 Planets around 11 Nearby M Dwarfs
Butler, R. Paul; Vogt, Steven S.; Holden, Bradford +10 more
Earth-sized planets in the habitable zones of M dwarfs are good candidates for the study of habitability and detection of biosignatures. To search for these planets, we analyze all available radial velocity data and apply four signal detection criteria to select the optimal candidates. We find 10 strong candidates satisfying these criteria and thr…