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Evidence for Multiple Accretion Events in the Gaia-Sausage/Enceladus Structures
Koo, Jae-Rim; Beers, Timothy C.; Lee, Young Sun +1 more
We present evidence that multiple accretion events are required to explain the origin of the Gaia-Sausage and Enceladus (GSE) structures, based on an analysis of dynamical properties of main-sequence stars from the Sloan Digital Sky Survey Data Release 12 and Gaia Data Release 2. GSE members are selected to have eccentricity (e) > 0.7 and [Fe/H…
Comparing hypervelocity star populations from the Large Magellanic Cloud and the Milky Way
Rossi, E. M.; Marchetti, T.; Evans, F. A. +2 more
We predict and compare the distributions and properties of hypervelocity stars (HVSs) ejected from the centres of the Milky Way (MW) and the Large Magellanic Cloud (LMC). In our model, HVSs are ejected at a constant rate - equal in both galaxies - via the Hills mechanism and are propagated in a combined potential, where the LMC orbits the MW on it…
A super-Earth on a close-in orbit around the M1V star GJ 740. A HADES and CARMENES collaboration
Rebolo, R.; Amado, P. J.; Caballero, J. A. +23 more
Context. M-dwarfs have proven to be ideal targets for planetary radial velocity (RV) searches due to their higher planet-star mass contrast, which favors the detection of low-mass planets. The abundance of super-Earth and Earth-like planets detected around this type of star motivates further such research on hosts without reported planetary compan…
The MOSDEF-LRIS Survey: Probing the ISM/CGM Structure of Star-forming Galaxies at z 2 Using Rest-UV Spectroscopy
Siana, Brian; Shapley, Alice E.; Reddy, Naveen A. +6 more
The complex structure of gas, metals, and dust in the interstellar and circumgalactic medium (ISM and CGM, respectively) in star-forming galaxies can be probed by Lyα emission and absorption, low-ionization interstellar (LIS) metal absorption, and dust reddening E(B - V). We present a statistical analysis of the mutual correlations among Lyα equiv…
Two Planets Straddling the Habitable Zone of the Nearby K Dwarf Gl 414A
Cargile, Phillip A.; Knutson, Heather A.; Pepper, Joshua +14 more
We present the discovery of two planets orbiting the nearby (D = 11.9 pc) K7 dwarf Gl 414A. Gl 414A b is a sub-Neptune mass planet with ${M}_{b}\sin {i}_{b}={7.60}_{-2.19}^{+2.44}$ M⊕ and a semimajor axis of 0.23 ± 0.01 au. Gl 414A c is a sub-Saturn mass planet with ${M}_{c}\sin {i}_{c}={53.83}_{-8.58}^{+9.18}$ M⊕ and a semim…
Detecting globular cluster tidal extensions with Bayesian inference - I. Analysis of ω Centauri with Gaia EDR3
Ferguson, A. M. N.; Peñarrubia, J.; Kuzma, P. B.
The peripheral regions of globular clusters (GCs) are extremely challenging to study due to their low surface brightness nature and the dominance of Milky Way contaminant populations along their sightlines. We have developed a probabilistic approach to this problem through utilizing a mixture model in spatial and proper motion space that separatel…
Evidence for galaxy quenching in the green valley caused by a lack of a circumgalactic medium
Charlton, Jane C.; Kacprzak, Glenn G.; Nanayakkara, Themiya +5 more
The relationship between a galaxy's properties and its circumgalactic medium (CGM) provides a unique view of how galaxies evolve. We present an interesting edge-on (i = 86°) disc galaxy (G1547) where the CGM is probed by a background quasar at a distance of 84 kpc and within 10° of the galaxy major axis. G1547 does not have any detectable CGM abso…
ACCESS: An Optical Transmission Spectrum of the High-gravity Hot Jupiter HAT-P-23b
Kirk, James; López-Morales, Mercedes; MacDonald, Ryan J. +11 more
We present a new ground-based visible transmission spectrum of the high-gravity, hot Jupiter HAT-P-23b, obtained as part of the ACCESS project. We derive the spectrum from five transits observed between 2016 and 2018, with combined wavelength coverage between 5200 Å and 9269 Å in 200 Å bins, and with a median precision of 247 ppm per bin. HAT-P-23…
Giant molecular cloud formation at the interface of colliding supershells in the large magellanic cloud
Inoue, Tsuyoshi; Kawamura, Akiko; Fukui, Yasuo +8 more
We investigate the H I envelope of the young, massive GMCs in the star-forming regions N48 and N49, which are located within the high column density H I ridge between two kpc-scale supergiant shells, LMC 4 and LMC 5. New long-baseline H I 21 cm line observations with the Australia Telescope Compact Array (ATCA) were combined with archival shorter …
AzTEC survey of the central molecular zone: increasing spectral index of dust with density
Wang, Q. Daniel; Wilson, Grant W.; Tang, Yuping
The central molecular zone (CMZ) of our Galaxy hosts an extreme environment analogous to that found in typical starburst galaxies in the distant Universe. In order to understand dust properties in environments like our CMZ, we present results from a joint spectral energy distribution analysis of our AzTEC/Large Millimeter Telescope survey, togethe…