Explanipedia

Evaluación de la autorregulación docente: validación y perfiles en formación inicial Open

C. Eiroa, Daniel Trías, Nigel Manchini, Valentina Ronqui · 2025

Comprender cómo los futuros docentes autorregulan sus actividades de enseñanza es fundamental para fortalecer la calidad educativa. Evaluar este proceso representa un desafío, especialmente en la formación inicial, donde su desarrollo es e…

Environmental effects on nearby debris discs Open

A. M. Heras, C. Eiroa, C. del Burgo, J. P. Marshall, B. Montesinos · 2025

We probe the effect of the ISM on debris disc occurrence rates and on the morphologies of the discs. We used results from the Herschel Space Observatory DUNES and DEBRIS surveys of 295 nearby FGK dwarf stars imaged at 100 $μ$m and 160 $μ$m…

Environmental effects on nearby debris discs Open

A. M. Heras, C. Eiroa, C. del Burgo, J. P. Marshall, B. Montesinos · 2025

Aims . We investigate the influence of the interstellar medium (ISM) on debris discs using a statistical approach. We probe the effect of the ISM on debris disc occurrence rates and on the morphologies of the discs. Methods . We used resul…

High precision astrometry mission for the detection and characterization of nearby habitable planetary systems with the Nearby Earth Astrometric Telescope (NEAT) Open

F. Malbet, Alain Léger, Minhua Shao, Renaud Goullioud, A. G. A. Brown , et al. · 2022

(abridged) A complete census of planetary systems around a volume-limited sample of solar-type stars (FGK dwarfs) in the Solar neighborhood with uniform sensitivity down to Earth-mass planets within their Habitable Zones out to several AUs…

The search for gas in debris discs: ALMA detection of CO gas in HD 36546 Open

Isabel Rebollido, Álvaro Ribas, I. de Gregorio‐Monsalvo, E. Villaver, B. Montesinos , et al. · 2021

Debris discs represent the last stages of planet formation and as such are expected to be depleted of primordial gas. None the less, in the last few years the presence of cold gas has been reported in ∼20 debris discs from far-infrared to …

The Circumstellar Gas of Phi Leonis in the UV Open

C. A. Grady, Isabel Rebollido, Alexander Brown, Barry Y. Welsh, C. Eiroa · 2021

HST UV spectra were obtained to study whether the φ Leo system has one or more stellar companions, as shown for the A-star dwarf, HR10, stellar pulsation, or transiting exocomets. During five partial HST observation sets spread over 13 mon…

The A-shell star ϕ Leo revisited: its photospheric and circumstellar spectra Open

C. Eiroa, B. Montesinos, Isabel Rebollido, Th. Henning, R. Launhardt , et al. · 2021

Context. We previously suggested that variable red- and blueshifted absorption features observed in the Ca II K line towards the A-type shell star ϕ Leo are likely due to solid, comet-like bodies in the circumstellar (CS) environment. Aims…

The A-shell star Phi Leo revisited: its photospheric and circumstellar spectra Open

C. Eiroa, B. Montesinos, Isabel Rebollido, Th. Henning, R. Launhardt , et al. · 2021

Variable red- and blue-shifted absorption features observed in the Ca ii K line towards the A-type shell star $ϕ$ Leo have been suggested by us in a previous work to be likely due to solid, comet-like bodies in the circumstellar (CS) envir…

The co-existence of hot and cold gas in debris discs (Corrigendum) Open

Isabel Rebollido, C. Eiroa, B. Montesinos, J. Maldonado, E. Villaver , et al. · 2019

International audience

Connecting substellar and stellar formation: the role of the host star’s metallicity Open

J. Maldonado, E. Villaver, C. Eiroa, G. Micela · 2019

Context. Most of our current understanding of the planet formation mechanism is based on the planet metallicity correlation derived mostly from solar-type stars harbouring gas-giant planets. Aims. To achieve a more extensive grasp on the s…

Debris discs with multiple absorption features in metallic lines: circumstellar or interstellar origin? Open

Daniela Iglesias, A. Bayo, J. Olofsson, Z. Wahhaj, C. Eiroa , et al. · 2018

Debris disks are second generation dusty disks thought to be devoid of gas.\nHowever, this idea has been challenged in the last years by gas detections in\nsome systems. We compiled a database of 301 debris disks and collected\nhigh--resol…

Kuiper belt analogues in nearby M-type planet-host systems Open

Grant M. Kennedy, G. Bryden, D. R. Ardila, C. Eiroa, J. F. Lestrade , et al. · 2018

We present the results of a Herschel survey of 21 late-type stars that host planets discovered by the radial velocity technique. The aims were to discover new discs in these systems and to search for any correlation between planet presence…

Early phases in the stellar and substellar formation and evolution: Infrared and submillimeter data in the Barnard 30 dark cloud Open

D. Barrado, I. de Gregorio‐Monsalvo, N. Huélamo, M. Morales‐Calderón, A. Bayo , et al. · 2017

The early evolutionary stage of brown dwarfs are not very well characterized, specially during the embedded phase. To gain insight into the dominant formation mechanism of very low-mass objects and brown dwarfs, we conducted deep observati…

K2-139 b: a low-mass warm Jupiter on a 29-d orbit transiting an active K0 V star Open

Oscar Barragán, D. Gandolfi, A. M. S. Smith, H. J. Deeg, M. Fridlund , et al. · 2017

We announce the discovery of K2-139 b (EPIC 218916923 b), a transiting warm-Jupiter (Teq=547±25 K) on a 29-day orbit around an active (log R′HK = −4.46 ± 0.06) K0 V star in K2 Campaign 7. We derive the system's parameters by combining the …

Chemical fingerprints of hot Jupiter planet formation Open

J. Maldonado, E. Villaver, C. Eiroa · 2017

Context. The current paradigm to explain the presence of Jupiter-like planets with small orbital periods ( P < 10 days; hot Jupiters), which involves their formation beyond the snow line following inward migration, has been challenged by r…

Early phases in the stellar and substellar formation and evolution Open

D. Barrado, I. de Gregorio‐Monsalvo, N. Huélamo, M. Morales‐Calderón, A. Bayo , et al. · 2017

Aims. The early evolutionary stage of brown dwarfs (BDs) is not very well characterized, especially during the embedded phase. Our goal is to gain insight into the dominant formation mechanism of very low-mass objects and BDs. Methods. We …

On the chemical fingerprints of hot Jupiter planets formation Open

J. Maldonado, E. Villaver, C. Eiroa · 2017

The current paradigm to explain the presence of Jupiters with small orbital periods (P $<$ 10 days; hot Jupiters) that involves their formation beyond the snow line following inward migration, has been challenged by recent works that explo…

Molecular Gas in Debris Disks around Young A-type Stars Open

A. Moór, M. Curé, Á. Kóspál, P. Ábrahám, T. Csengeri , et al. · 2017

According to the current paradigm of circumstellar disk evolution, gas-rich primordial disks evolve into gas-poor debris disks that are composed of second-generation dust. To explore the transition between these phases, we searched for 12C…

Herschel GASPS spectral observations of T Tauri stars in Taurus. Unraveling far-infrared line emission from jets and discs Open

M. Alonso-Martínez, P. Riviére-Marichalar, G. Meeus, I. Kamp, Min Fang , et al. · 2017

At early stages of stellar evolution young stars show powerful jets and/or\noutflows that interact with protoplanetary discs and their surroundings.\nDespite the scarce knowledge about the interaction of jets and/or outflows with\ndiscs, s…

EPIC 218916923 b: a low-mass warm Jupiter on a 29-day orbit transiting an active K0 V star Open

Oscar Barragán, D. Gandolfi, A. M. S. Smith, H. J. Deeg, M. Fridlund , et al. · 2017

We announce the discovery of EPIC218916923 b, a transiting warm-Jupiter ($T_\mathrm{eq}$=555$\pm$11 K) on a 29-day orbit around an active (log$R^\prime_\mathrm{HK}$ = $-$4.49 $\pm$ 0.03) K0 V star in K2 Campaign 7. We derive the system's p…

A gas density drop in the inner 6 AU of the transition disk around the Herbig Ae star HD 139614 Open

A. Carmona, W.‐F. Thi, I. Kamp, Clément Baruteau, Albert Matter , et al. · 2016

\n Context. Quantifying the gas surface density inside the dust cavities and gaps of transition disks is important to establish their origin. \n Aims. We seek to constrain the surface density of warm gas in the inner disk of HD 139614, an …

Exocomet signatures around the A-shell starφLeonis? Open

C. Eiroa, Isabel Rebollido, B. Montesinos, E. Villaver, Olivier Absil , et al. · 2016

We present an intensive monitoring of high-resolution spectra of the Ca ii K line in the A7IV shell star φ Leo at very short (minutes, hours), short (night to night), and medium (weeks, months) timescales. The spectra show remarkable varia…

A gas density drop in the inner 6 AU of the transition disk around the Herbig Ae star HD 139614: Further evidence for a giant planet inside the disk? Open

A. Carmona, W.‐F. Thi, I. Kamp, Clément Baruteau, Albert Matter , et al. · 2016

Context: Quantifying the gas content inside the dust gaps of transition disks is important to establish their origin. Aims: We seek to constrain the surface density of warm gas in the disk of HD 139614, a Herbig Ae star with a transition d…

Incidence of debris discs around FGK stars in the solar neighbourhood Open

B. Montesinos, C. Eiroa, A. V. Krivov, J. P. Marshall, G. L. Pilbratt , et al. · 2016

Context. Debris discs are a consequence of the planet formation process and constitute the fingerprints of planetesimal systems. Their counterparts in the solar system are the asteroid and Edgeworth-Kuiper belts.\n\t\t\t\t Aims. The aim of…

Early science with the Large Millimetre Telescope: Deep LMT/AzTEC millimetre observations of ϵ Eridani and its surroundings Open

M. Chávez, E. Bertone, Fernando Cruz-Sáenz de Miera, J. P. Marshall, G. W. Wilson , et al. · 2016

ϵ Eridani is a nearby, young Sun-like star that hosts a ring of cool debris analogous to the Solar system's Edgeworth-Kuiper belt. Early observations at (sub-)mm wavelengths gave tentative evidence of the presence of inhomogeneities in the…

A submillimetre search for pre- and proto-brown dwarfs in Chamaeleon II Open

I. de Gregorio‐Monsalvo, D. Barrado, H. Bouy, A. Bayo, Aina Palau , et al. · 2016

\n Context. The Chamaeleon II molecular cloud is an active star-forming region that offers an excellent opportunity to study the formation of brown dwarfs in the southern hemisphere.\n Aims. Our aims are to identify a population of pre- an…

A network of filaments detected byHerschelin the Serpens core Open

V. Roccatagliata, J. E. Dale, T. Ratzka, L. Testi, Andreas Burkert , et al. · 2015

Context. Filaments represent a key structure during the early stages of the star formation process. Simulations show that filamentary structures commonly formed before and during the formation of cores.Aims. The Serpens core is an ideal la…

A network of filaments detected by Herschel in the Serpens Core: A laboratory to test simulations of low-mass star formation Open

V. Roccatagliata, J. E. Dale, T. Ratzka, L. Testi, Andreas Burkert , et al. · 2015

Filaments represent a key structure during the early stages of the star formation process. Simulations show filamentary structure commonly formed before and during the formation of cores. Aims. The Serpens Core represents an ideal laborato…

FIRST DETECTION OF THERMAL RADIOJETS IN A SAMPLE OF PROTO-BROWN DWARF CANDIDATES Open

Ó. Morata, Aina Palau, Ricardo F. González, I. de Gregorio‐Monsalvo, Álvaro Ribas , et al. · 2015

We observed with the Jansky Very Large Array at 3.6 and 1.3 cm a sample of 11 proto-brown dwarf (BD) candidates in Taurus in a search for thermal radio jets driven by the most embedded BDs. We detected for the first time four thermal radio…

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