N. Huélamo
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View article: Disk fraction among free-floating planetary-mass objects in Upper Scorpius
Disk fraction among free-floating planetary-mass objects in Upper Scorpius Open
Free-floating planetary-mass objects (FFPs) have been detected through direct imaging in several young, nearby star-forming regions. The properties of circumstellar disks around these objects may provide a valuable probe into their origin …
View article: Multiplicity of young isolated planetary mass objects in Taurus and Upper Scorpius
Multiplicity of young isolated planetary mass objects in Taurus and Upper Scorpius Open
Free-floating planetary mass objects-worlds that roam interstellar space untethered to a parent star-challenge conventional notions of planetary formation and migration, but also of star and brown dwarf formation. We focus on the multiplic…
View article: Hints of Disk Substructure in the First Brown Dwarf with a Dynamical Mass Constraint
Hints of Disk Substructure in the First Brown Dwarf with a Dynamical Mass Constraint Open
We present high-resolution Atacama Large Millimeter/submillimeter Array (ALMA) observations at 0.89 mm of the Class II brown dwarf 2MASS J04442713+2512164 (2M0444), achieving a spatial resolution of 0 046 (∼6.4 au at the distance to …
View article: Euclid Quick Data Release (Q1) Ultracool dwarfs in the Euclid Deep Field North
Euclid Quick Data Release (Q1) Ultracool dwarfs in the Euclid Deep Field North Open
Ultracool dwarfs (UCDs) encompass the lowest mass stars and brown dwarfs, defining the stellar substellar boundary. They have significant potential for advancing the understanding of substellar physics; however, these objects are challengi…
View article: Free-floating planetary mass objects in LDN 1495 from Euclid Early Release Observations
Free-floating planetary mass objects in LDN 1495 from Euclid Early Release Observations Open
Context . Substellar objects, including brown dwarfs and free-floating planetary-mass objects, are a significant product of star formation. Their sensitivity to initial conditions and early dynamical evolution makes them especially valuabl…
View article: Substellar candidates at the earliest stages: The SUCANES database
Substellar candidates at the earliest stages: The SUCANES database Open
Context . Brown dwarfs are the bridge between low-mass stars and giant planets. One way of shedding light on their dominant formation mechanism is to study them at the earliest stages of their evolution, when they are deeply embedded in th…
View article: KOBE-1: The first planetary system from the KOBE survey
KOBE-1: The first planetary system from the KOBE survey Open
Context . K-dwarf stars are promising targets in the exploration of potentially habitable planets. Their properties, falling between G and M dwarfs, provide an optimal trade-off between the prospect of habitability and ease of detection. T…
View article: An Abrupt Change in the Disk Fraction of Free-Floating Planets at the Deuterium-Burning Ignition Limit
An Abrupt Change in the Disk Fraction of Free-Floating Planets at the Deuterium-Burning Ignition Limit Open
Free-floating planets (FFPs) - planetary-mass objects that roam the galaxy unbound to any star - have been identified through both indirect microlensing detections in the field \citep{Mroz2017, Sumi2023} and direct observations within youn…
View article: Observations of pre- and proto-brown dwarfs in nearby clouds: paving the way to further constraining theories of brown dwarf formation
Observations of pre- and proto-brown dwarfs in nearby clouds: paving the way to further constraining theories of brown dwarf formation Open
Brown Dwarfs (BDs) are crucial objects in our understanding of both star and planet formation. However, there is still an unconcluded debate about which is the dominant formation mechanism of these objects. For this, it is mandatory to stu…
View article: <i>Euclid</i>: Early Release Observations – A glance at free-floating newborn planets in the σ Orionis cluster
<i>Euclid</i>: Early Release Observations – A glance at free-floating newborn planets in the σ Orionis cluster Open
We provide an early assessment of the imaging capabilities of the Euclid space mission to deeply probe nearby star-forming regions and associated very young open clusters, and in particular, to determine to which extent it can shed light i…
View article: Imaging the Jet of MWC 349A with Resolved Radio Recombination Line Emission from ALMA
Imaging the Jet of MWC 349A with Resolved Radio Recombination Line Emission from ALMA Open
Jets and disk winds arise from materials with excess angular momentum ejected from the accretion disks in forming stars. How these structures are launched and how they impact the gas within the innermost regions of these objects remains po…
View article: ExoplANETS-A: A virtual observatory database for host stars and planetary systems
ExoplANETS-A: A virtual observatory database for host stars and planetary systems Open
Context. ExoplANETS-A is an EU Horizon-2020 project with the primary objective of establishing new knowledge on exoplanet atmospheres. Intimately related to this topic is the study of the host stars’ radiative properties in order to unders…
View article: Gas, not dust: Migration of TESS/<i>Gaia</i> hot Jupiters possibly halted by the magnetospheres of protoplanetary disks
Gas, not dust: Migration of TESS/<i>Gaia</i> hot Jupiters possibly halted by the magnetospheres of protoplanetary disks Open
Context. The presence of short-period (< 10 days) planets around main sequence (MS) stars has been associated either with the dust-destruction region or with the magnetospheric gas-truncation radius in the protoplanetary disks that surroun…
View article: The AstraLux-TESS high spatial resolution imaging survey
The AstraLux-TESS high spatial resolution imaging survey Open
Context . Chance-aligned sources or blended companions can cause false positives in planetary transit detections or simply bias the determination of the candidate properties. In the era of high-precision space-based photometers, the need f…
View article: Polarimetric differential imaging with VLT/NACO
Polarimetric differential imaging with VLT/NACO Open
Context . The observed diversity of exoplanets can possibly be traced back to the planet formation processes. Planet-disk interactions induce sub-structures in the circumstellar disk that can be revealed via scattered light observations. H…
View article: Substellar science in the wake of the ESA Euclid space mission
Substellar science in the wake of the ESA Euclid space mission Open
The ESA space mission Euclid was launched on July 1st, 2023 and is undergoing its science verification phase. In this invited review we show that Euclid means a before and an after for our understanding of ultra-cool dwarfs and substellar-…
View article: Modeling of the High-velocity Jet Powered by the Massive Star MWC 349A
Modeling of the High-velocity Jet Powered by the Massive Star MWC 349A Open
MWC 349A is a massive star with a well-known circumstellar disk rotating following a Keplerian law, and an ionized wind launched from the disk surface. Recent observations with the Atacama Large Millimeter/submillimeter Array (ALMA) carrie…
View article: Modeling of the high-velocity jet powered by the massive star MWC 349A
Modeling of the high-velocity jet powered by the massive star MWC 349A Open
MWC 349A is a massive star with a well-known circumstellar disk rotating following a Keplerian law, and an ionized wind launched from the disk surface. Recent ALMA observations carried out toward this system have however revealed an additi…
View article: Tentative co-orbital submillimeter emission within the Lagrangian region <i>L</i><sub>5</sub> of the protoplanet PDS 70 b
Tentative co-orbital submillimeter emission within the Lagrangian region <i>L</i><sub>5</sub> of the protoplanet PDS 70 b Open
Context. High-spatial resolution Atacama Large Millimeter/submillimeter Array (ALMA) data have revealed a plethora of substructures in protoplanetary disks. Some of those features are thought to trace the formation of embedded planets. One…
View article: The beta Pictoris system: Setting constraints on the planet and the disk structures at mid-IR wavelengths with NEAR
The beta Pictoris system: Setting constraints on the planet and the disk structures at mid-IR wavelengths with NEAR Open
[abridged] We analyzed mid-infrared high-contrast coronagraphic images of the beta Pictoris system, taking advantage of the NEAR experiment using the VLT/VISIR instrument. The goal of our analysis is to investigate both the detection of th…
View article: The <i>β</i> Pictoris system: Setting constraints on the planet and the disk structures at mid-IR wavelengths with NEAR
The <i>β</i> Pictoris system: Setting constraints on the planet and the disk structures at mid-IR wavelengths with NEAR Open
Context. β Pictoris is a young nearby system hosting a well-resolved edge-on debris disk, along with at least two exoplanets. It offers key opportunities for carrying out detailed studies of the evolution of young planetary systems and the…
View article: KOBEsim: A Bayesian observing strategy algorithm for planet detection in radial velocity blind-search surveys
KOBEsim: A Bayesian observing strategy algorithm for planet detection in radial velocity blind-search surveys Open
Context. Ground-based observing time is precious in the era of exoplanet follow-up and characterization, especially in high-precision radial velocity instruments. Blind-search radial velocity surveys thus require a dedicated observational …
View article: Searching for H<sub><i>α</i></sub>-emitting sources in the gaps of five transitional disks
Searching for H<sub><i>α</i></sub>-emitting sources in the gaps of five transitional disks Open
Context. (Pre-)Transitional disks show gaps and cavities that can be related to ongoing planet formation. According to theory, young embedded planets can accrete material from the circumplanetary and circumstellar disks and can be detected…
View article: Searching for H$_α$-emitting sources in the gaps of five transitional disks. SPHERE/ZIMPOL high-contrast imaging
Searching for H$_α$-emitting sources in the gaps of five transitional disks. SPHERE/ZIMPOL high-contrast imaging Open
(Pre-)transitional disks show gaps and cavities that can be related with on-going planet formation. According to theory, young embedded planets can accrete material from the circumplanetary and circumstellar disks, so that they could be de…
View article: The KOBE experiment: K-dwarfs Orbited By habitable Exoplanets
The KOBE experiment: K-dwarfs Orbited By habitable Exoplanets Open
The detection of habitable worlds is one of humanity’s greatest endeavors. Thus far, astrobiological studies have shown that one of the most critical components for allowing life to develop is liquid water. Its chemical properties and its …
View article: Lithium depletion boundary, stellar associations, and<i>Gaia</i>
Lithium depletion boundary, stellar associations, and<i>Gaia</i> Open
Context. Stellar ages are key to improving our understanding of different astrophysical phenomena. However, many techniques to estimate stellar ages are highly model-dependent. The lithium depletion boundary (LDB), based on the presence or…
View article: <i>Gaia</i> EDR3 comparative study of protoplanetary disk fractions in young stellar clusters
<i>Gaia</i> EDR3 comparative study of protoplanetary disk fractions in young stellar clusters Open
Context. The lifetime of protoplanetary disks around young stars limits the timescale of planet formation. A disk dissipation timescale ≤10 Myr was inferred from surveys that count the relative number of stars with disks – the disk fractio…
View article: A rich population of free-floating planets in the Upper Scorpius young stellar association
A rich population of free-floating planets in the Upper Scorpius young stellar association Open
View article: Search for associations containing young stars (SACY). VIII. An updated census of spectroscopic binary systems exhibiting hints of non-universal multiplicity among their associations
Search for associations containing young stars (SACY). VIII. An updated census of spectroscopic binary systems exhibiting hints of non-universal multiplicity among their associations Open
Context. Nearby young associations offer one of the best opportunities for a detailed study of the properties of young stellar and substellar objects thanks to their proximity ( Aims: We seek to update the spectroscopy binary fraction of t…
View article: ALMA observations of the early stages of substellar formation in the Lupus 1 and 3 molecular clouds
ALMA observations of the early stages of substellar formation in the Lupus 1 and 3 molecular clouds Open
Context. The dominant mechanism leading to the formation of brown dwarfs (BDs) remains uncertain. While the census of Class II analogs in the substellar domain continues to grow, the most direct keys to formation, which are obtained from y…