Search Publications
Lithium pollution of a white dwarf records the accretion of an extrasolar planetesimal
Clemens, J. C.; Dufour, P.; Blouin, S. +4 more
Tidal disruption and subsequent accretion of planetesimals by white dwarfs can reveal the elemental abundances of rocky bodies in exoplanetary systems. Those abundances provide information on the composition of the nebula from which the systems formed, which is analogous to how meteorite abundances inform our understanding of the early Solar Syste…
The Evolving Interstellar Medium of Star-forming Galaxies, as Traced by Stardust
Brammer, Gabriel; Daddi, Emanuele; Toft, Sune +13 more
We analyze the far-infrared (FIR) properties of ~5000 star-forming galaxies at z < 4.5, drawn from the deepest, super-deblended catalogs in the GOODS-N and COSMOS fields. We develop a novel panchromatic spectral energy distribution fitting algorithm, Stardust, that models the emission from stars, active galactic nuclei (AGNs), and infrared dust…
The Location of Magnetic Reconnection at Earth's Magnetopause
Fuselier, S. A.; Trattner, K. J.; Petrinec, S. M.
One of the major questions about magnetic reconnection is how specific solar wind and interplanetary magnetic field conditions influence where reconnection occurs at the Earth's magnetopause. There are two reconnection scenarios discussed in the literature: a) anti-parallel reconnection and b) component reconnection. Early spacecraft observations …
New Candidate Extreme T Subdwarfs from the Backyard Worlds: Planet 9 Citizen Science Project
Debes, John H.; Meisner, Aaron M.; Line, Michael R. +27 more
Schneider et al. presented the discovery of WISEA J041451.67-585456.7 and WISEA J181006.18-101000.5, which appear to be the first examples of extreme T-type subdwarfs (esdTs; metallicity ≤-1 dex, Teff ≲ 1400 K). Here, we present new discoveries and follow-up of three T-type subdwarf candidates, with an eye toward expanding the sample of…
Modelling the He I triplet absorption at 10 830 Å in the atmospheres of HD 189733 b and GJ 3470 b
Sánchez-López, A.; López-Puertas, M.; Nagel, E. +16 more
Characterising the atmospheres of exoplanets is key to understanding their nature and provides hints about their formation and evolution. High resolution measurements of the helium triplet absorption of highly irradiated planets have been recently reported, which provide a new means of studying their atmospheric escape. In this work we study the e…
The VMC survey - XLIII. The spatially resolved star formation history across the Large Magellanic Cloud
Sun, Ning-Chen; Girardi, Léo; de Grijs, Richard +19 more
We derive the spatially resolved star formation history (SFH) for a 96 deg2 area across the main body of the Large Magellanic Cloud (LMC), using the near-infrared photometry from the VISTA survey of the Magellanic Clouds (VMC). The data and analyses are characterized by a great degree of homogeneity and a low sensitivity to the interste…
Multiwavelength Observations of Fast Radio Bursts
Zampieri, Luca; Turatto, Massimo; Nicastro, Luciano +3 more
The origin and phenomenology of the Fast Radio Burst (FRB) remains unknown despite more than a decade of efforts. Though several models have been proposed to explain the observed data, none is able to explain alone the variety of events so far recorded. The leading models consider magnetars as potential FRB sources. The recent detection of FRBs fr…
Magnetic helicity and energy budget around large confined and eruptive solar flares
Veronig, A. M.; Thalmann, J. K.; Gupta, M.
Context. In order to better understand the underlying processes and prerequisites for solar activity, it is essential to study the time evolution of the coronal magnetic field of solar active regions (ARs) associated with flare activity.
Aims: We investigate the coronal magnetic energy and helicity budgets of ten solar ARs around the times of…
OGLE-2018-BLG-0567Lb and OGLE-2018-BLG-0962Lb: Two Microlensing Planets through the Planetary-caustic Channel
Han, Cheongho; Udalski, Andrzej; Lee, Chung-Uk +32 more
We present the analyses of two microlensing events, OGLE-2018-BLG-0567 and OGLE-2018-BLG-0962. In both events, the short-lasting anomalies were densely and continuously covered by two high-cadence surveys. The light-curve modeling indicates that the anomalies are generated by source crossings over the planetary caustics induced by planetary compan…
HOLISMOKES. IV. Efficient mass modeling of strong lenses through deep learning
Halkola, A.; Suyu, S. H.; Cañameras, R. +4 more
Modeling the mass distributions of strong gravitational lenses is often necessary in order to use them as astrophysical and cosmological probes. With the large number of lens systems (≳105) expected from upcoming surveys, it is timely to explore efficient modeling approaches beyond traditional Markov chain Monte Carlo techniques that ar…