Search Publications
High-sensitivity radio study of the non-thermal stellar bow shock EB27
del Palacio, Santiago; Benaglia, Paula; Hales, Christopher +1 more
We present a deep radio-polarimetric observation of the stellar bow shock EB27 associated with the massive star BD+43○3654. This is the only stellar bow shock confirmed to have non-thermal radio emission. We used the Jansky Very Large Array in S band (2-4 GHz) to test whether this synchrotron emission is polarized. The unprecedented sen…
An ACA Survey of [C I] 3P1-3P0, CO J = 4 - 3, and Dust Continuum in Nearby U/LIRGs
Ho, Luis C.; Bolatto, Alberto D.; Tadaki, Ken-ichi +11 more
We present the results of surveying [C I] 3P1-3P0, 12CO J = 4 - 3, and 630 µm dust continuum emission for 36 nearby ultra/luminous infrared galaxies (U/LIRGs) using the Band 8 receiver mounted on the Atacama Compact Array of the Atacama Large Millimeter/submillimeter Array. We describe t…
A holistic review of a galactic interaction
Laporte, Chervin F. P.; Drimmel, Ronald; Johnston, Kathryn V. +3 more
Our situation as occupants of the Milky Way (MW) Galaxy, bombarded by the Sagittarius dwarf galaxy, provides an intimate view of physical processes that can lead to the dynamical heating of a galactic disc. While this evolution is instigated by Sagittarius, it is also driven by the intertwined influences of the dark matter halo and the disc itself…
Solar Orbiter observations of the Kelvin-Helmholtz waves in the solar wind
Fedorov, A.; Lavraud, B.; Génot, V. +17 more
Context. The Kelvin-HeImholtz (KH) instability is a nonlinear shear-driven instability that develops at the interface between shear flows in plasmas. KH waves have been inferred in various astrophysical plasmas, and have been observed in situ at the magnetospheric boundaries of solar-system planets and through remote sensing at the boundaries of c…
Classifying stars, galaxies, and AGNs in CLAUDS + HSC-SSP using gradient boosted decision trees
Sawicki, Marcin; Goulding, Andy D.; Coupon, Jean +1 more
Classifying catalogue objects as stars, galaxies, or active galactic nuclei (AGNs) is a crucial part of any statistical study of galaxies. We describe our pipeline for binary (star/galaxy) and multiclass (star/galaxy/Type I AGN/Type II AGN) classification developed for the very deep CLAUDS + HSC-SSP u*grizy data set. Our method uses the XGBoost im…
High-resolution LAsMA 12CO and 13CO observation of the G305 giant molecular cloud complex. I. Feedback on the molecular gas
Menten, K. M.; Wyrowski, F.; Thompson, M. A. +3 more
Context. Understanding the effect of feedback, interaction of young massive stars with their parental giant molecular clouds, is of central importance for studies of the interstellar medium and star formation.
Aims: We observed the G305 star-forming complex in the J = 3-2 lines of 12CO and 13CO to investigate how molecul…
The impact of a stealth CME on the Martian topside ionosphere
Nampoothiri, Govind G.; Thampi, Smitha V.; Pant, Tarun K. +1 more
Solar cycle 24 is one of the weakest solar cycles recorded, but surprisingly the declining phase of it had a slow coronal mass ejection (CME) that evolved without any low coronal signature and is classified as a stealth CME that was responsible for an intense geomagnetic storm at Earth (Dst = -176 nT). The impact of this space weather event on the…
Isotopes of chlorine from HCl in the Martian atmosphere
Montmessin, F.; Korablev, O.; Fedorova, A. A. +7 more
Hydrogen chloride gas was recently discovered in the atmosphere of Mars during southern summer seasons. Its connection with potential chlorine reservoirs and the related atmospheric chemistry is now of particular interest and actively studied. Measurements by the Atmospheric Chemistry Suite mid-infrared channel (ACS MIR) on the ExoMars Trace Gas O…
Revealing the Vertical Cloud Structure of a Young Low-mass Brown Dwarf, an Analog to the β-Pictoris b Directly Imaged Exoplanet, through Keck I/MOSFIRE Spectrophotometric Variability
Lew, Ben W. P.; Karalidi, Theodora; Manjavacas, Elena +2 more
Young brown dwarfs are analogs to giant exoplanets, as they share effective temperatures, near-infrared colors, and surface gravities. Thus, the detailed characterization of young brown dwarfs might shed light on the study of giant exoplanets that we are currently unable to observe with a sufficient signal-to-noise to allow a precise characterizat…
Evidence of the Gaia-VLBI position differences being related to radio source structure
Xu, Ming H.; Savolainen, Tuomas; Anderson, James M. +3 more
Context. We report the relationship between the Gaia-VLBI position differences and the magnitudes of source structure effects in VLBI observations.
Aims: Because the Gaia-VLBI position differences are statistically significant for a considerable number of common sources, we discuss and attempt to explain these position differences based on VL…