Search Publications
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…
Automated crater detection with human level performance
Lee, Christopher; Hogan, James
Crater cataloging is an important yet time-consuming part of geological mapping. We present an automated Crater Detection Algorithm (CDA) that is competitive with expert-human researchers and hundreds of times faster.
The CDA uses multiple neural networks to process digital terrain model and thermal infra-red imagery to identify and locate cr…Stellar feedback in a clumpy galaxy at z 3.4
Le Floc'h, E.; Rodighiero, G.; Zanella, A. +18 more
Giant star-forming regions (clumps) are widespread features of galaxies at z ≈ 1-4. Theory predicts that they can play a crucial role in galaxy evolution, if they survive to stellar feedback for >50 Myr. Numerical simulations show that clumps' survival depends on the stellar feedback recipes that are adopted. Up to date, observational constrain…
High-resolution Hα imaging of the northern Galactic plane and the IGAPS image database
Eislöffel, J.; Groot, P. J.; Stecklum, B. +19 more
The INT Galactic Plane Survey (IGAPS) is the merger of the optical photometric surveys IPHAS and UVEX based on data from the Isaac Newton Telescope (INT) obtained between 2003 and 2018. It captures the entire northern Galactic plane within the Galactic coordinate range |b|< 5° and 30° < ℓ < 215°. From the beginning, the incorporation of n…
The Effect of Environment on Star Formation Activity and Morphology at 0.5 < z < 2.5 in CANDELS
Fang, Guanwen; Gu, Yizhou; Yuan, Qirong +2 more
To explore the effect of environment on star formation and the morphological transformation of high-redshift galaxies, we present a robust estimation of localized galaxy overdensity using a density estimator within the Bayesian probability framework. The maps of environmental overdensity at 0.5 < z < 2.5 are constructed for the five CANDELS …