Explanipedia

Erosion of a dense molecular core by a strong outflow from a massive protostar Open

J. A. López-Vázquez, M. Fernandez-Lopez, J. M. Girart, S. Curiel, R. Estalella , et al. · 2025

Context. Molecular outflows from massive protostars can impact the interstellar medium in different ways, adding turbulence on different spatial scales, dragging material at supersonic velocities, producing shocks and heating, and physical…

Infall Motions in the Hot Core Associated with the Hypercompact H ii Region G345.0061+01.794 B Open

Toktarkhan Komesh, Guido Garay, C. Henkel, Aruzhan Omar, R. Estalella , et al. · 2024

We report high angular resolution observations, made with the Atacama Large Millimeter Array in band 6, of high excitation molecular lines of and SO 2 and of the H29 α radio recombination line toward the G345.0061+01.794 B HC H ii r…

Can radial temperature profiles be inferred using NH3 (1, 1) and (2, 2) observations? Open

R. Estalella, Aina Palau, G. Busquet · 2024

A number of works infer radial temperature profiles of envelopes surrounding young stellar objects using several rotational transitions in a pixel-by-pixel or azimuthally-averaged basis. However, in many cases the assumption that the rotat…

Can radial temperature profiles be inferred using NH3 (1, 1) and (2, 2) observations? Open

R. Estalella, Aina Palau, G. Busquet · 2024

A number of works infer radial temperature profiles of envelopes surrounding young stellar objects using several rotational transitions in a pixel-by-pixel or azimuthally averaged basis. However, in many cases the assumption that the rotat…

Radio survey of the stellar population in the infrared dark cloud G14.225-0.506 Open

Elena Díaz-Márquez, R. Grau, G. Busquet, J. M. Girart, Á. Sánchez-Monge , et al. · 2023

Context . The infrared dark cloud (IRDC) G14.225-0.506 is part of the extended and massive molecular cloud located to the southwest of the H II region M17. The cloud is associated with a network of filaments, which result in two different …

Radio survey of the stellar population in the infrared dark cloud G14.225-0.506 Open

Elena Díaz-Márquez, R. Grau, G. Busquet, J. M. Girart, Á. Sánchez-Monge , et al. · 2023

The IRDC G14.225-0.506 is associated with a network of filaments, which result in two different dense hubs, as well as with several signposts of star formation activity. The aim of this work is to study the cm continuum emission to charact…

Disk and Envelope Streamers of the GGD 27-MM1 Massive Protostar Open

Manuel Fernández-López, J. M. Girart, J. A. López-Vázquez, R. Estalella, G. Busquet , et al. · 2023

We present new Atacama Large Millimeter/submillimeter Array 0.98 mm observations of the continuum emission and several molecular lines toward the high-mass protostellar system GGD 27-MM1, driving the HH 80-81 radio jet. The detailed analys…

Infall Motions in the Hot Core Associated with Hypercompact HII Region G345.0061+01.794 B Open

Toktarkhan Komesh, Guido Garay, Aruzhan Omar, R. Estalella, Zhandos Assembay , et al. · 2023

We report high angular resolution observations, made with the Atacama Large Millimeter Array in band 6, of high excitation molecular lines of $\rm CH_3CN$ and $\rm SO_2$ and of the H29$α$ radio recombination line towards the G345.0061+01.7…

Disk and Envelope Streamers of the GGD27-MM1 Massive Protostar Open

Manuel Fernández-López, J. M. Girart, J. A. López-Vázquez, R. Estalella, G. Busquet , et al. · 2023

We present new Atacama Large (sub)Millimeter Array 0.98 mm observations of the continuum emission and several molecular lines toward the high-mass protostellar system GGD27-MM1, driving the HH 80-81 radio-jet. The detailed analysis of the …

Observing the very early stages of the formation of a circumbinary planetary system in SVS 13 Open

Guillem Anglada, Ana Karla Díaz-Rodríguez, Guillermo Blázquez-Calero, Mayra Osorio, José F. Gómez , et al. · 2022

<p>The early stages of the formation of binary stellar systems are still rather poorly understood observationally, which contrasts with some significant recent improvements in numerical simulations. We present a comprehensive study w…

NIR spectroscopic survey of protostellar jets in the star-forming region IC 1396N Open

F. Massi, Rosario López, M. T. Beltrán, R. Estalella, J. M. Girart · 2022

Context. The bright-rimmed cloud IC 1396N, associated with an intermediate-mass star-forming region, hosts a number of CO, molecular hydrogen, and Herbig-Haro (HHs) outflows powered by a set of millimetre compact sources. Aims. The aim of …

NIR spectroscopic survey of protostellar jets in the star forming region\n IC 1396N Open

F. Massi, Ricardo López–Valdivia, M. T. Beltrán, R. Estalella, J. M. Girart · 2022

Abridged. The bright-rimmed cloud IC1396N hosts CO, H$_2$, and Herbig-Haro\noutflows powered by millimetre compact sources. We aim to characterise the\nkinematics and physical conditions of the H$_2$ emission features spread over\nIC1396N,…

The Physical Properties of the SVS 13 Protobinary System: Two Circumstellar Disks and a Spiraling Circumbinary Disk in the Making Open

Ana Karla Díaz-Rodríguez, Guillem Anglada, Guillermo Blázquez-Calero, Mayra Osorio, José F. Gómez , et al. · 2022

We present Very Large Array (VLA) and Atacama Large Millimeter/submillimeter Array (ALMA) observations of the close (0.″3 = 90 au separation) protobinary system SVS 13. We detect two small circumstellar disks (radii ∼12 and ∼9 au in dust, …

Collision of protostellar jets in the star-forming region IC 1396N Open

Rosario López, R. Estalella, M. T. Beltrán, F. Massi, J. A. Acosta‐Pulido , et al. · 2022

Context. The bright-rimmed cloud IC 1396N is believed to host one of the few known cases where two bipolar CO outflows driven by young stellar objects collide. The CO outflows are traced by chains of knots of H 2 emission, with enhanced em…

Collision of protostellar jets in the star-forming region IC 1396N. Analysis of knot proper motions Open

C. Fruck, R. Estalella, J. A. Acosta‐Pulido, J. M. Girart · 2022

The bright-rimmed cloud IC 1396N is believed to host one of the few known cases where two bipolar CO outflows driven by young stellar objects actually collide. The CO outflows are traced by chains of knots of H_2 emission, with enhanced em…

The Physical Properties of the SVS 13 Protobinary System: Two Circumstellar Disks and a Spiraling Circumbinary Disk in the Making Open

Ana Karla Díaz-Rodríguez, Guillem Anglada, Guillermo Blázquez-Calero, Mayra Osorio, José F. Gómez , et al. · 2021

We present VLA and ALMA observations of the close (0.3" = 90 au separation) protobinary system SVS 13. We detect two small circumstellar disks (radii $\sim$12 and $\sim$9 au in dust, and $\sim$30 au in gas) with masses of $\sim$0.004-0.009…

A survey of IRAS young stellar object candidates Open

Rosario López, A. Riera, R. Estalella, Gabriel Gómez · 2021

Context. Jets and outflows are associated with young stellar objects across the stellar mass spectrum, from brown dwarf protostars to massive Ae/Be stars. Frequently the jet morphology is spatially discontinuous because of the temporal var…

A survey of IRAS young stellar object candidates. Searching for large-scale Herbig-Haro objects Open

Rosario López, A. Riera, R. Estalella, Gabriel Gómez · 2021

Jets and outflows are associated with young stellar objects across the stellar mass spectrum, from brown dwarf protostars to massive, Ae/Be stars. Frequently, the jet morphology is spatially discontinuous because of the temporal variabilit…

Analysis and test of the central-blue-spot infall hallmark <i>(Corrigendum)</i> Open

R. Estalella, Guillem Anglada, Ana Karla Díaz-Rodríguez, J. M. Mayén-Gijón · 2021

VLA ammonia observations of L1287 Open

Inma Sepúlveda, R. Estalella, Guillem Anglada, Rosario López, A. Riera , et al. · 2020

Aims. In this paper, we study the dense gas of the molecular cloud LDN 1287 (L1287), which harbors a double FU Ori system, an energetic molecular outflow, and a still-forming cluster of deeply embedded low-mass young stellar objects that s…

VLA ammonia observations of L1287: analysis of the "Guitar" core and two filaments Open

Inma Sepúlveda, R. Estalella, Guillem Anglada, C. Fruck, Alberto Sánchez Riera , et al. · 2020

The present work aims at studying the dense gas of the molecular cloud LDN 1287 (L1287), which harbors a double FU Ori system, an energetic molecular outflow and a still-forming cluster of deeply embedded low-mass, young stellar objects, s…

In search for an observational correlation between the fragmentation level and the magnetic field properties of massive dense cores Open

Aina Palau, Qizhou Zhang, J. M. Girart, Junhao Liu, Ram Rao , et al. · 2020

Tidal Interaction between the UX Tauri A/C Disk System Revealed by ALMA Open

Luis A. Zapata, Luis F. Rodrı́guez, Manuel Fernández-López, Aina Palau, R. Estalella , et al. · 2020

We present sensitive and high angular-resolution (∼0.″2–0.″3) (sub)millimeter (230 and 345 GHz) continuum and CO(2−1)/CO(3−2) line archive observations of the disk star system in UX Tauri carried out with the Atacama Large Millimeter/Submi…

Tidal Interaction between the UX Tauri Disk A/C System Revealed by ALMA Open

Luis A. Zapata, Luis F. Rodrí guez, Manuel Fernández-López, Aina Palau, R. Estalella , et al. · 2020

We present sensitive and high angular resolution ($\sim$0.2-0.3$''$) (sub)millimeter (230 and 345 GHz) continuum and CO(2$-$1)/CO(3$-$2) line archive observations of the disk star system in UX Tauri carried out with ALMA (The Atacama Large…

ALMA resolves the hourglass magnetic field in G31.41+0.31 Open

M. T. Beltrán, M. Padovani, J. M. Girart, Daniele Galli, R. Cesaroni , et al. · 2019

Context. Submillimeter Array (SMA) 870 μ m polarization observations of the hot molecular core G31.41+0.31 revealed one of the clearest examples up to date of an hourglass-shaped magnetic field morphology in a high-mass star-forming region…

Analysis and test of the central-blue-spot infall hallmark Open

R. Estalella, Guillem Anglada, Ana Karla Díaz-Rodríguez, J. M. Mayén-Gijón · 2019

Aims. The infall of material onto a protostar, in the case of optically thick line emission, produces an asymmetry in the blue- and red-wing line emissions. For an angularly resolved emission, this translates in a blue central spot in the …

Unveiling a cluster of protostellar disks around the massive protostar GGD 27 MM1 Open

G. Busquet, J. M. Girart, R. Estalella, Manuel Fernández-López, Roberto Galván-Madrid , et al. · 2019

Context . Most stars form in clusters and thus it is important to characterize the protostellar disk population in dense environments to assess whether the environment plays a role in the subsequent evolution. Specifically, it is critical …

Millimeter Dust Polarization From A Disk Around Massive Open

J. M. Girart, G. Busquet, N. Añe, R. Estalella, F. Fernandez-Lopez , et al. · 2017

In this talk we present ALMA 1.1 mm polarimetric observations of the dusty disk around a massive young stellar object with an angular resolution of 30mas (50 AU). The dust emission shows a polarization level of about 1-2%. The disk is well…

Unveiling The L1157-B1 Bow-Shock Structure From Optical To Millimeter Wavelengths Open

G. Busquet, R López, R. Estalella, L. Codella · 2017

Protostellar shocks play a key role in the chemical evolution of star-forming clouds. They induce large variations of temperature and density, which can activate gas-phase reactions, ionization processes, and evaporation/erosion of dust gr…

HfS, Hyperfine Structure Fitting Tool Open

R. Estalella · 2016

HfS is a tool to fit the hyperfine structure of spectral lines, with multiple velocity components. The HfS_nh3 procedures included in HfS fit simultaneously the hyperfine structure of the NH$_3$ (J,K)= (1,1) and (2,2) transitions, and perf…

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