Lucy Evans
A5006838132- Astrophysics and Star Formation Studies
- Atmospheric Ozone and Climate
- Molecular Spectroscopy and Structure
- Astro and Planetary Science
- Stellar, planetary, and galactic studies
- Postcolonial and Cultural Literary Studies
- Cold Atom Physics and Bose-Einstein Condensates
- Solar and Space Plasma Dynamics
- Gamma-ray bursts and supernovae
- Advanced Chemical Physics Studies
- Caribbean history, culture, and politics
- Spectroscopy and Laser Applications
- Astronomical Observations and Instrumentation
- Spacecraft and Cryogenic Technologies
- High-pressure geophysics and materials
- Astronomy and Astrophysical Research
- Linguistic Variation and Morphology
- Thermodynamic properties of mixtures
- Chemical Thermodynamics and Molecular Structure
- Travel Writing and Literature
- Short Stories in Global Literature
- Superconducting Materials and Applications
- SAS software applications and methods
- Advanced NMR Techniques and Applications
- Nuclear Physics and Applications
University of Leeds
2009-2024
Arcetri Astrophysical Observatory
2020-2023
Université de Toulouse
2020-2023
Université Toulouse III - Paul Sabatier
2020-2023
Centre National de la Recherche Scientifique
2020-2023
Abstract The Atacama Large Millimeter/submillimeter Array (ALMA) can probe the molecular content of planet-forming disks with unprecedented sensitivity. These observations allow us to build up an inventory volatiles available for forming planets and comets. Herbig Ae transition are fruitful targets due thermal sublimation complex organic molecules (COMs) likely H 2 O-rich ices in these disks. IRS 48 disk shows a particularly rich chemistry that be directly linked its asymmetric dust trap....
Abstract Observations of disks with the Atacama Large Millimeter/submillimeter Array (ALMA) allow us to map chemical makeup nearby protoplanetary unprecedented spatial resolution and sensitivity. The typical outer Class II disk observed ALMA is one an elevated C/O ratio a lack oxygen-bearing complex organic molecules, but there are now some interesting exceptions: three transition around Herbig Ae stars all show oxygen-rich gas traced via unique detections molecules SO CH 3 OH. We present...
Abstract This essay reviews published responses to Paul Gilroy's The Black Atlantic (1993). begins by summarizing main arguments and considering the significance of his term “double consciousness,” both as a theme theoretical approach. It goes on examine reviews, articles, books journal special issues, spanning from 1994 2008, which either engage directly with text or make use “black Atlantic” basis for further research. Early balance its shortcomings against groundbreaking potential,...
ABSTRACT The study of hot corinos in solar-like protostars has been so far mostly limited to the Class 0 phase, hampering our understanding their origin and evolution. In addition, recent evidence suggests that planet formation starts already during I which therefore represents a crucial step future planetary system chemical composition. Hence, become paramount importance. Here, we report discovery corino towards prototypical protostar L1551 IRS5, obtained within ALMA (Atacama Large...
Abstract We have observed the very low-mass Class 0 protostar IRAS 15398−3359 at scales ranging from 50 to 1800 au, as part of Atacama Large Millimeter/Submillimeter Array Program FAUST. uncover a linear feature, visible in H 2 CO, SO, and C 18 O line emission, which extends source direction almost perpendicular known active outflow. Molecular emission SiO, CH 3 OH further reveals an arc-like structure connected outer end feature separated protostar, 15398−3359, by 1200 au. The is...
Methanol (CH$_3$OH) and formaldehyde (H$_2$CO) are chemically coupled organic molecules proposed to act as an intermediate step between simple more complex prebiotic compounds. Their abundance distributions across disks regulate the potential of material at different disk radii. We present observations multiple methanol transitions toward Herbig Ae HD 100546 obtained with ALMA, building upon previous serendipitous detection in this source. find that has a higher rotational temperature...
Abstract We have observed the late Class I protostellar source Elias 29 at a spatial resolution of 70 au with Atacama Large Millimeter/submillimeter Array as part FAUST Program. focus on line emission SO, while that 34 C 18 O, CS, SiO, H 13 CO + , and DCO are used supplementarily. The distribution SO rotational temperature ( T rot (SO)) is evaluated by using intensity ratio its two excitation lines. Besides in vicinity protostar, hot spots found distance 500 from protostar; (SO) locally...
Context . While protostellar outflows are important in terms of mass accretion and angular momentum transport star formation processes, high-resolution observations protobinary systems still sparse. Aims We aim to reveal outflow structures traced by millimeter SiO emission a low-mass system, L483. Methods observed the ( J = 5−4) line L483 with Atacama Large Millimeter/submillimeter Array (ALMA) as part large program FAUST (Fifty AU STudy chemistry disk/envelope Solar-like protostars). The...
Abstract We report a study of the low-mass Class 0 multiple system VLA 1623AB in Ophiuchus star-forming region, using H 13 CO + ( J = 3–2), CS 5–4), and CCH N 3–2) lines as part ALMA Large Program FAUST. The analysis velocity fields revealed rotation motion envelope gradients outflows (about 2000 au down to 50 au). further investigated circumbinary 1623A disk, well 1623B disk. found that minor axis disk is misaligned by about 12° with respect large-scale outflow envelope. In contrast,...
Abstract The chemical diversity of low-mass protostellar sources has so far been recognized, and environmental effects are invoked as its origin. In this context, observations isolated without the influence nearby objects particular importance. Here, we report physical structures Class 0 source IRAS 16544−1604 in Bok globule CB 68, based on 1.3 mm Atacama Large Millimeter/submillimeter Array at a spatial resolution ∼70 au that were conducted part large program FAUST. Three interstellar...
Context. The origin of the chemical diversity observed around low-mass protostars probably resides in earliest history these systems. Aims. We aim to investigate impact protostellar feedback on chemistry and grain growth circumstellar medium multiple stellar Methods. In context ALMA Large Program FAUST, we present high-resolution (50 au) observations CH 3 OH, H 2 CO, SiO continuum emission at 1.3 mm towards Corona Australis star cluster. Results. Methanol reveals an arc-like structure ∼1800...
ABSTRACT The exploration of outflows in protobinary systems presents a challenging yet crucial endeavour, offering valuable insights into the dynamic interplay between protostars and their evolution. In this study, we examine morphology dynamics jets within IRAS 4A system. This analysis is based on ALMA observations SiO(5–4), H2CO(30, 3–20, 3), HDCO(41, 4–31, 3) with spatial resolution ∼150 au. Leveraging an astrochemical approach involving use diverse tracers beyond traditional ones has...
Recent observations suggest that planets formation starts early, in protostellar disks of $\le10^5$ yrs, which are characterized by strong interactions with the environment, e.g., through accretion streamers and molecular outflows. To investigate impact such phenomena on disk physical chemical properties it is key to understand what chemistry inherit from their natal environment. In context ALMA Large Program Fifty AU STudy disk/envelope system Solar-like protostars (FAUST), we present...
Methanol is a ubiquitous species commonly found in the molecular interstellar medium. It also crucial seed for building-up of chemical complexity star forming regions. Thus, understanding how its abundance evolves during formation process and whether it enriches emerging planetary system paramount importance. We used new data from ALMA Large Program FAUST (Fifty AU STudy chemistry disk/envelope Solar-like protostars) to study methanol line emission towards [BHB2007] 11 protobinary (sources A...
Context. Deuterium in H-bearing species is enhanced during the early stages of star formation. However, only a small number high-spatial-resolution deuteration studies exist towards protostellar objects, leaving small-scale structures these objects unrevealed and understudied. Aims. We aim to constrain deuterium fractionation ratios Class 0/I object formaldehyde (H 2 CO), which has abundant deuterated isotopologues this environment. Methods. used Atacama Large Millimeter Array (ALMA) within...
Context. The study of the early phases star and planet formation is important to understand physical chemical history stellar systems such as our own. In particular, protostars born in rich clusters are prototypes young Solar System. Aims. framework Seeds Of Life Space (SOLIS) large observational project, aim present work investigate origin previously inferred high flux energetic particles protocluster FIR4 Orion Molecular Cloud 2 (OMC-2), which appears asymmetric within itself. Methods....
The Atacama Large Millimeter/submillimeter Array (ALMA) can probe the molecular content of planet-forming disks with unprecedented sensitivity. These observations allow us to build up an inventory volatiles available for forming planets and comets. Herbig Ae transition are fruitful targets due thermal sublimation complex organic molecule (COM) likely H2O-rich ices in these disks. IRS 48 disk shows a particularly rich chemistry that be directly linked its asymmetric dust trap. Here, we...
Observations of disks with the Atacama Large Millimeter/submillimeter Array (ALMA) allow us to map chemical makeup nearby protoplanetary unprecedented spatial resolution and sensitivity. The typical outer Class II disk observed ALMA is one an elevated C/O ratio a lack oxygen-bearing complex organic molecules, but there are now some interesting exceptions: three transition around Herbig Ae stars all show oxygen-rich gas traced via unique detections molecules SO CH3OH. We present first results...
The ongoing physical and chemical processes in planet-forming disks set the stage for planet (and comet) formation. asymmetric disk around young star Oph-IRS 48 has one of most well-characterised inventories, showing molecular emission from a wide variety species at dust trap: simple molecules, such as CO SO SO_2 H_2CO to large complex organics, CH_3OH CH_3OCHO CH_3OCH_3 . One explanations structure is trapping by perturbation-induced vortex. We aimed constrain excitation properties which we...
Context. Star-forming molecular clouds are characterised by the ubiquity of intertwined filaments. The filaments have been observed in both high- and low-mass star-forming regions, they thought to split into collections sonic fibres. locations where converge termed hubs, these associated with young stellar clusters. However, observations filamentary structures within hubs at distances 75–300 pc require a high angular resolution <2″ (~ 150–600 au) that limits number such studies conducted...
The study of prestellar cores is critical as they set the initial conditions in star formation and determine final mass stellar object. To date, several hypotheses are describing their gravitational collapse. We perform detailed line analysis modelling H$_{2}$D$^{+}$ 110 -111 N$_{2}$H$^{+}$ 4-3 emission at 372 GHz, using 2'x2' maps (JCMT). Our goal to test most prominent dynamical models by comparing modelled gas kinematics spatial distribution (H$_{2}$D$^{+}$ N$_{2}$H$^{+}$) with...
Context. Isotopic fractionation is an important tool for investigating the chemical history of our Solar System. In particular, isotopic fraction nitrogen ( 14 N/ 15 N) lower in comets and other pristine System bodies with respect to value measured protosolar nebula, suggesting a local enrichment N during formation Therefore, interferometric studies precursors are needed us obtain clues about astrochemical origins. Aims. this work we have investigated variation ratio one closest analogues...
This article explores the way in which Dionne Brand's fictional text At Full and Change of Moon (1999) engages with idea circular movement on levels theme, imagery form. Following suggestion a tidal cycle its title, I read this as part text's aquatic trope. Presenting form short story cycle, first put forward that poetics Barbadian poet Kamau Brathwaite Martinican writer Édouard Glissant offer more appropriate context to structure than Forrest Ingram's study genre, builds up criteria based...
Aims . Interstellar complex organic molecules (iCOMs) are species commonly found in the interstellar medium. They believed to be crucial seed for build-up of chemical complexity star forming regions as well our own Solar System. Thus, understanding how their abundances evolve during formation process and whether it enriches emerging planetary system is paramount importance. Methods We use data from ALMA Large Program FAUST (Fifty AU STudy chemistry disk envelope solar protostars) study...