Osmar M. Guerra-Alvarado

Drift-dominated dust evolution. A multiwavelength analysis of dust rings in CY Tau and DoAr25

Anastasia Topalidou, Nienke van der Marel, Paola Pinilla, Haochang Jiang et autres

Protoplanetary disks are the birthplaces of planets, and understanding the distribution and evolution of dust within them is essential for tracing the early stages of planet formation. Following the DSHARP survey, we aim to constrain the radial distribution of the dust surface …

Gaps and Rings: A Near-Universal Trait of Extended Protoplanetary Discs

Quincy Bosschaart, Osmar M. Guerra-Alvarado, Nienke van der Marel, Gijs D. Mulders

Substructures such as rings, gaps, and cavities are commonly observed in protoplanetary discs and are thought to play a key role in dust evolution and planet formation. However, a fraction of the extended discs (68% dust radii > 30 AU) in nearby …

Molecular line emission from 1000 au scale outflows to <30 au compact structures in NGC1333 IRAS4A2

Osmar M. Guerra-Alvarado, Nienke van der Marel, Pooneh Nazari, James Di Francesco et autres

Aims. Studying protostellar objects in their earliest stages, particularly during the Class 0 phase, provides key insight into the beginnings of planet formation and dust evolution. Disentangling the various components, such as the envelope, outflow, and nascent disk, to characterize and understand …

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Observational constraints on evolution of dust disc properties in Upper Scorpius

Paola Pinilla, Anibal Sierra, N. T. Kurtovic, Rossella Anania et autres

ABSTRACT Protoplanetary discs in the Upper Scorpius star-forming region are excellent laboratories to investigate late stages of planet formation. In this work, we analyse the morphology of the dust continuum emission of 121 discs from an Atacama Large Millimeter Array (ALMA) Band …

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Multiwavelength Dust Characterization of the HL Tau Disk and Implications for Planet Formation

Takahiro Ueda, Sean M. Andrews, Carlos Carrasco‐González, Osmar M. Guerra-Alvarado et autres

Abstract We present a comprehensive analysis of the HL Tau dust disk by modeling its intensity profiles across six wavelengths (0.45–7.9 mm) with a resolution of 0 . ″ 05 (∼7 au). Using a Markov Chain Monte Carlo (MCMC) approach, we constrain …

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Multi-Wavelength Dust Characterization of the HL Tau Disk and Implications for Planet Formation

Takahiro Ueda, Sean M. Andrews, Carlos Carrasco‐González, Osmar M. Guerra-Alvarado et autres

We present a comprehensive analysis of the HL Tau dust disk by modeling its intensity profiles across six wavelengths (0.45 to 7.9 mm) with a resolution of 0.05 arcsec ($\sim7$ au). Using a Markov Chain Monte Carlo (MCMC) approach, we constrain key …

A high-resolution survey of protoplanetary disks in Lupus and the nature of compact disks

Osmar M. Guerra-Alvarado, Nienke van der Marel, Jonathan P. Williams, Paola Pinilla et autres

Aims. Most of the exoplanets discovered in our Galaxy to date orbit low-mass stars, which tend to host small disks in their early stages. To better elucidate the link between planet formation and disk substructures, observational biases should be reduced through observations …

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Rocky planet formation in compact disks around M dwarfs

María Ángeles Medina Sánchez, Nienke van der Marel, Michiel Lambrechts, Gijs D. Mulders et autres

Context. Due to the improvements in radial velocity and transit techniques, we know that rocky or rocky-icy planets, in particular close-in super-Earths in compact configurations, are the most common ones around M dwarfs. On the other hand, thanks to the high angular …

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Super-Earth formation in compact disks around M dwarfs

María Ángeles Medina Sánchez, Nienke van der Marel, Michiel Lambrechts, Gijs D. Mulders et autres

M dwarfs are the most common stars in our solar neighborhood. Due to the improvements in radial velocity and transit techniques, we know that rocky planets, in particular close-in super-Earths, in compact configurations are the most common ones around M dwarfs. On …

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Into the thick of it: ALMA 0.45 mm observations of HL Tau at a resolution of 2 au

Osmar M. Guerra-Alvarado, Carlos Carrasco‐González, Enrique Macías, Nienke van der Marel et autres

Aims. To comprehend the efficiency of dust evolution within protoplanetary disks, it is crucial to conduct studies of these disks using high-resolution observations at multiple wavelengths with the Atacama Large Millimeter/submillimeter Array (ALMA). Methods. In this work, we present high-frequency ALMA observations …

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Rocky planet formation in compact disks around M dwarfs

María Ángeles Medina Sánchez, Nienke van der Marel, Michiel Lambrechts, Gijs D. Mulders et autres

Rocky planets in compact configurations are the most common ones around M dwarfs. Many disks around very low mass stars (between 0.1 and 0.5 M$_\odot$) are rather compact and small (without observable substructures and radius less than 20 au), which favours the …

Into the thick of it: ALMA 0.45 mm observations of HL Tau at a resolution of 2 au

Osmar M. Guerra-Alvarado, Carlos Carrasco‐González, Enrique Macías, Nienke van der Marel et autres

Aims. To comprehend the efficiency of dust evolution within protoplanetary disks, it is crucial to conduct studies of these disks using high-resolution observations at multiple wavelengths with the Atacama Large Millimeter/submillimeter Array (ALMA). Methods. In this work, we present high-frequency ALMA observations …

nl, mx, de, gb, in, us, it, jp, cl (code pays fourni par la source)