Publications (57)
Detection of two power-law tails in the probability distribution functions of massive GMCs
N. Schneider, S. Bontemps, P. Girichidis +20
We report the novel detection of complex high-column density tails in the probability distribution functions (PDFs) for three high-mass star-forming regions (CepOB3, MonR2, NGC6334…
The Science Case for PILOT I: Summary and Overview
J. S. Lawrence, M. C. B. Ashley, J. Bailey +40
PILOT (the Pathfinder for an International Large Optical Telescope) is a proposed 2.5 m optical/infrared telescope to be located at Dome C on the Antarctic plateau. Conditions at D…
JWST/NIRSpec Observations of the Planetary Mass Companion TWA 27B
K. L. Luhman, P. Tremblin, S. M. Birkmann +8
We present 1-5um spectroscopy of the young planetary mass companion TWA 27B (2M1207B) performed with NIRSpec on board the James Webb Space Telescope. In these data, the fundamental…
JWST/NIRSpec Observations of the Coldest Known Brown Dwarf
K. L. Luhman, P. Tremblin, C. Alves de Oliveira +6
We present 1-5um spectroscopy of the coldest known brown dwarf, WISE J085510.83-071442.5 (WISE 0855), performed with the Near-Infrared Spectrograph (NIRSpec) on board the James Web…
The Origin of [CII] 158um Emission toward the HII Region Complex S235
L. D. Anderson, Z. Makai, M. Luisi +9
Although the 2P3/2-2P1/2 transition of [CII] at 158um is known to be an excellent tracer of active star formation, we still do not have a complete understanding of where within sta…
The Y-Type Brown Dwarfs: Estimates of Mass and Age from New Astrometry, Homogenized Photometry and Near-Infrared Spectroscopy
S. K. Leggett, P. Tremblin, T. L. Esplin +2
The survey of the mid-infrared sky by the Wide-field Infrared Survey Explorer (WISE) led to the discovery of extremely cold low-mass brown dwarfs, classified as Y dwarfs, which ext…
The GJ 504 system revisited. Combining interferometric, radial velocity, and high contrast imaging data
M. Bonnefoy, K. Perraut, A. -M. Lagrange +79
The G-type star GJ504A is known to host a 3 to 35 MJup companion whose temperature, mass, and projected separation all contribute to make it a test case for the planet formation th…
Age, size, and position of H ii regions in the Galaxy. Expansion of ionized gas in turbulent molecular clouds
P. Tremblin, L. D. Anderson, P. Didelon +8
This work aims at improving the current understanding of the interaction between H ii regions and turbulent molecular clouds. We propose a new method to determine the age of a larg…
A JWST/MIRI view of k Andromedae b: Refining its mass, age, and physical parameters
N. Godoy, E. Choquet, E. Serabyn +7
Context. kAndb is a substellar companion near the planet-brown dwarf boundary, orbiting a B9IV star at 50-100 au. Estimates of its age and mass vary, fueling a decade-long debate.…
Understanding star formation in molecular clouds III. Probability distribution functions of molecular lines in Cygnus X
N. Schneider, S. Bontemps, F. Motte +11
Column density (N) PDFs serve as a powerful tool to characterize the physical processes that influence the structure of molecular clouds. Star-forming clouds can best be characteri…
Idealised simulations of the deep atmosphere of hot jupiters: Deep, hot, adiabats as a robust solution to the radius inflation problem
F. Sainsbury-Martinez, P. Wang, S. Fromang +10
Context: The anomalously large radii of hot Jupiters has long been a mystery. However, by combining both theoretical arguments and 2D models, a recent study has suggested that the…
Understanding star formation in molecular clouds II. Signatures of gravitational collapse of IRDCs
N. Schneider, T. Csengeri, R. S. Klessen +6
We analyse column density and temperature maps derived from Herschel dust continuum observations of a sample of massive infrared dark clouds (G11.11-0.12, G18.82-0.28, G28.37+0.07,…
Water depletion and 15NH3 in the atmosphere of the coldest brown dwarf observed with JWST/MIRI
H. Kühnle, P. Patapis, P. Mollière +21
With a temperature of K WISE0855 is the coldest brown dwarf observed so far. Using the James Webb Space Telescope (JWST) we obtained observations that allow us to charac…
Radiative Rayleigh-Taylor Instability and the structure of clouds in planetary atmospheres
P. Tremblin, H. Bloch, M. González +5
Clouds are expected to form in a wide range of conditions in the atmosphere of exoplanets given the large range of possible condensible species. However this diversity might lead t…
Near-Infrared Spectroscopy of the Y0 WISEP J173835.52+273258.9 and the Y1 WISE J035000.32-565830.2: the Importance of Non-Equilibrium Chemistry
S. K. Leggett, P. Tremblin, D. Saumon +5
We present new near-infrared spectra, obtained at Gemini Observatory, for two Y dwarfs: WISE J035000.32-565830.2 (W0350) and WISEP J173835.52+273258.9 (W1738). A FLAMINGOS-2 R=540…
Rotational spectral modulation of cloudless atmospheres for L/T Brown Dwarfs and Extrasolar Giant Planets
P. Tremblin, M. W. Phillips, A. Emery +5
The rotational spectral modulation (spectro-photometric variability) of brown dwarfs is usually interpreted as a sign of the presence of inhomogeneous cloud covers in the atmospher…
3D simulations of globules and pillars formation around HII regions: turbulence and shock curvature
P. Tremblin, E. Audit, V. Minier +2
We investigate the interplay between the ionization radiation from massive stars and the turbulence inside the surrounding molecular gas thanks to 3D numerical simulations. We used…
Early Release Science of the exoplanet WASP-39b with JWST NIRSpec PRISM
Z. Rustamkulov, D. K. Sing, S. Mukherjee +91
Transmission spectroscopy of exoplanets has revealed signatures of water vapor, aerosols, and alkali metals in a few dozen exoplanet atmospheres. However, these previous inferences…
Early Release Science of the Exoplanet WASP-39b with JWST NIRSpec G395H
Lili Alderson, Hannah R. Wakeford, Munazza K. Alam +89
Measuring the abundances of carbon and oxygen in exoplanet atmospheres is considered a crucial avenue for unlocking the formation and evolution of exoplanetary systems. Access to a…
ATMOSPHERIX: I- An open source high resolution transmission spectroscopy pipeline for exoplanets atmospheres with SPIRou
B. Klein, F. Debras, J. -F. Donati +28
Atmospheric characterisation of exoplanets from the ground is an actively growing field of research. In this context we have created the ATMOSPHERIX consortium: a research project…
Early Release Science of the exoplanet WASP-39b with JWST NIRCam
Eva-Maria Ahrer, Kevin B. Stevenson, Megan Mansfield +96
Measuring the metallicity and carbon-to-oxygen (C/O) ratio in exoplanet atmospheres is a fundamental step towards constraining the dominant chemical processes at work and, if in eq…
A high-performance and portable asymptotic preserving radiation hydrodynamics code with the M1 model
H. Bloch, P. Tremblin, M. González +2
Aims. We present a new radiation hydrodynamics code, called "ARK-RT" which uses a two-moment model with the M1 closure relation for radiative transfer. This code aims at being read…
Spatial distribution of star formation related to ionized regions throughout the inner Galactic plane
P. Palmeirim, A. Zavagno, D. Elia +35
We present a comprehensive statistical analysis of star-forming objects located in the vicinities of 1 360 bubble structures throughout the Galactic Plane and their local environme…
Evidence for SiO cloud nucleation in the rogue planet PSO J318
P. Mollière, H. Kühnle, E. C. Matthews +25
Silicate clouds are known to significantly impact the spectra of late L-type brown dwarfs, with observable absorption features at ~ 10 micron. JWST has reopened our window to the m…
Filaments in the Lupus molecular clouds
M. Benedettini, E. Schisano, S. Pezzuto +19
We have studied the filaments extracted from the column density maps of the nearby Lupus 1, 3, and 4 molecular clouds, derived from photometric maps observed with the Herschel sate…
Ionization compression impact on dense gas distribution and star formation, Probability density functions around H ii regions as seen by Herschel
P. Tremblin, N. Schneider, V. Minier +22
Ionization feedback should impact the probability distribution function (PDF) of the column density around the ionized gas. We aim to quantify this effect and discuss its potential…
StarBench: The D-type expansion of an HII region
T. G. Bisbas, T. J. Haworth, R. J. R. Williams +16
StarBench is a project focused on benchmarking and validating different star-formation and stellar feedback codes. In this first StarBench paper we perform a comparison study of th…
Fingering convection and cloudless models for cool brown dwarf atmospheres
P. Tremblin, D. S. Amundsen, P. Mourier +5
This work aims to improve the current understanding of the atmospheres of brown dwarfs, especially cold ones with spectral type T and Y, whose modeling is a current challenge. Sili…
Multi-modal atmospheric characterization of Pictoris b: Adding high-resolution continuum spectra from GRAVITY
M. Ravet, M. Bonnefoy, G. Chauvin +24
We present the first VLTI/GRAVITY observations at R of Pic b. These four high S/N (20) K-band spectra conserve both the pseudo-continuum and molecular abso…
Dynamics of cluster-forming hub-filament systems: The case of the high-mass star-forming complex Monoceros R2
S. P. Trevino-Morales, A. Fuente, A. Sanchez-Monge +15
High-mass stars and star clusters commonly form within hub-filament systems. Monoceros R2, harbors one of the closest such systems, making it an excellent target for case studies.…
Pillars and globules at the edges of H ii regions, Confronting Herschel observations and numerical simulations
P. Tremblin, V. Minier, N. Schneider +24
Pillars and globules are present in many high-mass star-forming regions, such as the Eagle nebula (M16) and the Rosette molecular cloud, and understanding their origin will help ch…
Atmospheric properties of AF Lep b with forward modeling
P. Palma-Bifani, G. Chauvin, D. Borja +11
Aims. We aim to expand the atmospheric exploration of AF Lep b by modeling all available observations obtained with SPHERE at VLT (between 0.95-1.65, at 2.105, and 2.253 m, and…
Early Release Science of the exoplanet WASP-39b with JWST NIRISS
Adina D. Feinstein, Michael Radica, Luis Welbanks +86
Transmission spectroscopy provides insight into the atmospheric properties and consequently the formation history, physics, and chemistry of transiting exoplanets. However, obtaini…
Site testing for submillimetre astronomy at Dome C, Antarctica
P. Tremblin, V. Minier, N. Schneider +17
Over the past few years a major effort has been put into the exploration of potential sites for the deployment of submillimetre astronomical facilities. Amongst the most important…
Nonideal self-gravity and cosmology: the importance of correlations in the dynamics of the large-scale structures of the Universe
P. Tremblin
Inspired by the role of correlations in the statistical mechanics of nonideal self-interacting fluids, we suggest that unresolved sub-structures (i.e. correlations) have to be take…
Exploring deep and hot adiabats as a potential solution to the radius inflation problem in brown dwarfs: Long-timescale models of the deep atmospheres of KELT-1b, Kepler-13Ab, and SDSS1411B
F. Sainsbury-Martinez, S. L. Casewell, J. D. Lothringer +2
The anomalously large radii of highly-irradiated gaseous exoplanets has long been a mystery. One mechanism suggested as a solution for hot Jupiters is the heating of the deep atmos…
Reevaluating the cosmological redshift: insights into inhomogeneities and irreversible processes
P. Tremblin, G. Chabrier
Understanding the expansion of the Universe remains a profound challenge in fundamental physics. The complexity of solving General Relativity equations in the presence of intricate…
Advection of potential temperature in the atmosphere of irradiated exoplanets: a robust mechanism to explain radius inflation
P. Tremblin, G. Chabrier, N. J. Mayne +6
The anomalously large radii of strongly irradiated exoplanets have remained a major puzzle in astronomy. Based on a 2D steady state atmospheric circulation model, the validity of w…
JWST/NIRSpec Observations of Brown Dwarfs in the Orion Nebula Cluster
K. L. Luhman, C Alves de Oliveira, I. Baraffe +4
We have used the multiobject mode of the Near-Infrared Spectrograph (NIRSpec) on board the James Webb Space Telescope (JWST) to obtain low-resolution 1-5um spectra of 22 brown dwar…
Cluster-formation in the Rosette molecular cloud at the junctions of filaments
N. Schneider, T. Csengeri, M. Hennemann +31
For many years feedback processes generated by OB-stars in molecular clouds, including expanding ionization fronts, stellar winds, or UV-radiation, have been proposed to trigger su…
Thermo-compositional diabatic convection in the atmospheres of brown dwarfs and in Earth's atmosphere and oceans
P. Tremblin, T. Padioleau, M. Phillips +12
By generalizing the theory of convection to any type of thermal and compositional source terms (diabatic processes), we show that thermohaline convection in Earth oceans, fingering…
Cloudless atmospheres for young low-gravity substellar objects
P. Tremblin, G. Chabrier, I. Baraffe +7
Atmospheric modeling of low-gravity (VL-G) young brown dwarfs remains a challenge. The presence of very thick clouds has been suggested because of their extremely red near-infrared…
From forced collapse to H ii region expansion in Mon R2: Envelope density structure and age determination with Herschel
P. Didelon, F. Motte, P. Tremblin +32
The surroundings of HII regions can have a profound influence on their development, morphology, and evolution. This paper explores the effect of the environment on H II regions in…
3D simulations of pillars formation around HII regions: the importance of shock curvature
P. Tremblin, E. Audit, V. Minier +1
Radiative feedback from massive stars is a key process to understand how HII regions may enhance or inhibit star formation in pillars and globules at the interface with molecular c…
Exploring the Extremes: Characterizing a New Population of Old and Cold Brown Dwarfs
A. M. Meisner, S. K. Leggett, S. E. Logsdon +3
Mapping out the populations of thick disk and halo brown dwarfs is important for understanding the metallicity dependence of low-temperature atmospheres and the substellar mass fun…
Parallaxes and Infrared Photometry of three Y0 dwarfs
R. L. Smart, Dániel Apai, J. Davy Kirkpatrick +7
We have followed up the three Y0 dwarfs WISEPA J041022.71+150248.5, WISEPA J173835.53+273258.9 and WISEPC J205628.90+145953.3 using the UKIRT/WFCAM telescope/instruments. We find p…
JWST/MIRI observations of the young TWA 27 system: hydrocarbon disk chemistry, silicate clouds, evidence for a CPD
P. Patapis, M. Morales-Calderón, A. M. Arabhavi +39
The Mid-Infrared Instrument (MIRI) on the James Webb Space Telescope (JWST) enables the characterisation of young self-luminous gas giants at previously inaccessible wavelengths, r…
Non-ideal self-gravity and cosmology: the importance of correlations in the dynamics of the large-scale structures of the Universe
P. Tremblin, G. Chabrier, T. Padioleau +1
Inspired by the statistical mechanics of an ensemble of interacting particles (BBGKY hierarchy), we propose to account for small-scale inhomogeneities in self-gravitating astrophys…
Mopra CO Observations of the Bubble HII Region RCW120
L. D. Anderson, L. Deharveng, A. Zavagno +6
We use the Mopra radio telescope to test for expansion of the molecular gas associated with the bubble HII region RCW120. A ring, or bubble, morphology is common for Galactic HII r…
Globules and Pillars in Cygnus X I. Herschel Far-infrared imaging of the Cyg OB2 environment
N. Schneider, S. Bontemps, F. Motte +21
The radiative feedback of massive stars on molecular clouds creates pillars, globules and other features at the interface between the HII region and molecular cloud. We present her…
Cloudless atmospheres for L/T dwarfs and extra-solar giant planets
P. Tremblin, D. S. Amundsen, G. Chabrier +5
The admitted, conventional scenario to explain the complex spectral evolution of brown dwarfs (BD) since their first detections twenty years ago, has always been the key role playe…
A high performance and portable all-Mach regime flow solver code with well-balanced gravity. Application to compressible convection
T. Padioleau, P. Tremblin, E. Audit +2
Convection is an important physical process in astrophysics well-studied using numerical simulations under the Boussinesq and/or anelastic approximations. However these approaches…
Globules and pillars seen in the [CII] 158 micron line with SOFIA
N. Schneider, R. Güsten, P. Tremblin +22
Molecular globules and pillars are spectacular features, found only in the interface region between a molecular cloud and an HII-region. Impacting Far-ultraviolet (FUV) radiation c…
ATMOSPHERIX: II- Characterising exoplanet atmospheres through transmission spectroscopy with SPIRou
F. Debras, B. Klein, J. -F. Donati +26
In a companion paper, we introduced a publicly-available pipeline to characterise exoplanet atmospheres through high-resolution spectroscopy. In this paper, we use this pipeline to…
Characterising The Atmospheric Dynamics Of HD209458b-like Hot Jupiters Using AI Driven Image Recognition/Categorisation
F. Sainsbury-Martinez, P. Tremblin, M. Mancip +3
In-order to understand the results of recent observations of exoplanets, models have become increasingly complex. Unfortunately this increases both the computational cost and outpu…
Worldwide site comparison for submillimetre astronomy
P. Tremblin, N. Schneider, V. Minier +2
The most important limitation for ground-based submillimetre (submm) astronomy is the broad-band absorption of the total water vapour in the atmosphere above an observation site, o…
Understanding star formation in molecular clouds I. Effects of line-of-sight contamination on the column density structure
N. Schneider, V. Ossenkopf, T. Csengeri +6
Column-density maps of molecular clouds are one of the most important observables in the context of molecular cloud- and star-formation (SF) studies. With the Herschel satellite it…