Résumé IA · arXiv: 1905.03844v1 · astro-ph.SR
Modelling the Spatial Distribution and Origin of CO Gas in Debris Disks
L’essentiel
- Les observations ALMA ont détecté une ligne rotationnelle $^{12}$CO(2-1) dans trois disques de débris.
- La question est de savoir si le gaz détecté est un vestige de la phase protoplanétaire primordiale ou s'il a été libéré par la collision de corps secondaires.
- La technique itérative Lucy-Richardson a été utilisée pour résoudre le problème des disques circumstellaires et obtenir les géométries et les distributions de luminosité en surface du gaz.
- Les paramètres du disque obtenus sont utilisés comme entrée pour des modèles thermo-chimiques afin d'examiner les scénarios primordiaux et cométaires pour l'origine du gaz.
- Une origine secondaire pour le gaz dans ces disques est privilégiée, avec des masses de gaz CO ($\sim 3\times10^{-3}$ M$_{\oplus}$) nécessitant des taux de production ($\sim 5\times 10^{-7}$ M$_{\oplus}$/an) similaires à ceux estimés pour le vrai disque riche en gaz $\beta$ Pic.
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Parmi les 30 articles autour de celui-ci, le nom qui revient le plus : A. Moór (5 articles)
14 autres personnes en signent plusieurs. La carte complète ajoute leurs institutions et leurs approches, d’après les articles des dernières années.
Les articles autour de celui-ci
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Les articles les plus proches
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Primordial or Secondary? Testing Models of Debris Disk Gas with ALMAG. Cataldi, Y. Aikawa, K. Iwasaki et al. · 2023 · Astrophysical Journal · cité 16 fois · Pas encore résumé
Résumé scientifique
The origin and evolution of gas in debris disks are still not well understood. Secondary gas production from cometary material or a primordial origin have been proposed. So far, observations have mostly concentrated on CO, with only a few C observations available. We overview the C and CO content of debris disk gas and test state-of-the-art models. We use new and archival Atacama Large Millimeter/submillimeter Array (ALMA) observations of CO and C i emission, complemented by C ii data from Herschel, for a sample of 14 debris disks. This expands the number of disks with ALMA measurements of both CO and C i by 10 disks. We present new detections of C i emission toward three disks: HD 21997, HD…
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Thermochemical constraints on a primordial-origin of gas-rich debris disksH. Mitani, W. Ooyama, R. Nakatani et al. · 2026 · arXiv (Cornell University) preprint · Résumé IA disponible
En bref
Des disques primordiaux pauvres en poussière restent chimiquement compatibles avec les disques de débris riches en CO sous faible ionisation, mais prédisent une émission de carbone neutre trop étendue.
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Thermochemical constraints on a primordial-origin of gas-rich debris disksH. Mitani, W. Ooyama, R. Nakatani et al. · 2026 · Earth and Planetary Astrophysics · Résumé IA disponible
En bref
Des disques primordiaux pauvres en poussière peuvent reproduire les contraintes chimiques des disques de débris riches en CO sous faible ionisation, mais leur émission de carbone neutre reste trop étendue.
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The search for gas in debris discs: ALMA detection of CO gas in HD 36546Isabel Rebollido, Álvaro Ribas, Itziar de Gregorio-Monsalvo et al. · 2021 · Earth and Planetary Astrophysics · cité 10 fois · Pas encore résumé
Résumé scientifique
Debris discs represent the last stages of planet formation and as such are expected to be depleted of primordial gas. Nonetheless, in the last few years the presence of cold gas has been reported in $\sim$ 20 debris discs from far-IR to (sub-)mm observations and hot gas has been observed in the optical spectra of debris discs for decades. While the origin of this gas is still uncertain, most evidences point towards a secondary origin, as a result of collisions and evaporation of small bodies in the disc. In this paper, we present ALMA observations aimed at the detection of CO gas in a sample of 8 debris discs with optical gas detections. We report the detection of CO ($^{12}$CO and $^{13}$CO…
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Predictions for the secondary CO, C and O gas content of debris discs from the destruction of volatile-rich planetesimalsQuentin Kral, Luca Matra, Mark Wyatt et al. · 2017 · Earth and Planetary Astrophysics · cité 95 fois · Résumé IA disponible
En bref
Le modèle prédit la production et l’observabilité de gaz secondaire CO, C et O dans les disques de débris, et explique qualitativement les observations disponibles.
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New millimeter CO observations of the gas-rich debris disks 49 Cet and HD 32297Attila Moór, Quentin Kral, Péter Ábrahám et al. · 2019 · Earth and Planetary Astrophysics · cité 30 fois · Résumé IA disponible
Résumé scientifique
Previous observations revealed the existence of CO gas at nearly protoplanetary level in several dust-rich debris disks around young A-type stars. Here we used the ALMA 7m-array to measure $^{13}$CO and C$^{18}$O emission toward two debris disks, 49 Cet and HD 32297, and detected similarly high CO content ($>$0.01M$_\oplus$). These high CO masses imply a highly efficient shielding of CO molecules against stellar and interstellar ultraviolet photons. Adapting a recent secondary gas disk model that considers both shielding by carbon atoms and self-shielding of CO, we can explain the observed CO level in both systems. Based on the derived gas densities we suggest that, in the HD 32297 disk, dus…
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The hybrid disks: a search and study to better understand evolution of disksJ. Pericaud, E. Di Folco, A. Dutrey et al. · 2016 · A&A 600, A62 (2017) · cité 33 fois · Résumé IA disponible
Résumé scientifique
The increased sensitivity of millimeter-wave facilities now makes possible the detection of low amounts of gas in debris disks. Some of the gas-rich debris disks harbor peculiar properties, with possible pristine gas and secondary generated dust. The origin of the gas in these hybrid disks is strongly debated and the current sample is too sparse to understand this phenomenon. More detections are necessary to increase the statistics on this population. Lying at the final stages of evolution of proto-planetary disks and at the beginning of the debris disk phase, these objects could provide new insight into the processes involved in the making of planetary systems. We carried out a deep survey …
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Molecular Gas in Debris Disks around Young A-type StarsA. Moór, M. Curé, Á. Kóspál et al. · 2017 · The Astrophysical Journal · cité 88 fois · Pas encore résumé
Résumé scientifique
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 12CO, 13CO, and C18O emission in seven dust-rich debris disks around young A-type stars, using the Atacama Large Millimeter/submillimeter Array (ALMA) in Band 6. We discovered molecular gas in three debris disks. In all of these disks, the 12CO line was optically thick, highlighting the importance of less abundant molecules in reliable mass estimates. By supplementing our target list with literature data, we compiled a volume-limited sample of dust-rich debris…
Les travaux antérieurs sur lesquels il s’appuie
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Imaging [CI] around HD 131835: reinterpreting young debris discs with protoplanetary disc levels of CO gas as shielded secondary discsQ. Kral, S. Marino, M. Wyatt et al. · 2018 · Monthly notices of the Royal Astronomical Society · cité 45 fois · Pas encore résumé
Résumé scientifique
Despite being >10Myr, there are ∼10 debris discs with as much CO gas as in protoplanetary discs. Such discs have been assumed to be “hybrid”, i.e., with secondary dust but primordial gas. Here we show that both the dust and gas in such systems could instead be secondary, with the high CO content caused by accumulation of neutral carbon (C0) that shields CO from photodissociating; i.e., these could be “shielded secondary discs”. New ALMA observations are presented of HD131835 that detect ∼3 × 10−3 M⊕ of C0, the majority 40-200au from the star, in sufficient quantity to shield the previously detected CO. A simple semi-analytic model for the evolution of CO, C and O originating in a volatile-ri…
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The co-existence of hot and cold gas in debris discs (Corrigendum)I. Rebollido, C. Eiroa, B. Montesinos et al. · 2018 · Astronomy & Astrophysics · cité 30 fois · Pas encore résumé
Résumé scientifique
Context. Debris discs have often been described as gas-poor discs as the gas-to-dust ratio is expected to be considerably lower than in primordial, protoplanetary discs. However, recent observations have confirmed the presence of a non-negligible amount of cold gas in the circumstellar (CS) debris discs around young main-sequence stars. This cold gas has been suggested to be related to the outgassing of planetesimals and cometary-like objects. Aims. The goal of this paper is to investigate the presence of hot gas in the immediate surroundings of the cold-gas-bearing debris-disc central stars. Methods. High-resolution optical spectra of all currently known cold-gas-bearing debris-disc systems…
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DISCOVERY OF MOLECULAR GAS AROUND HD 131835 IN AN APEX MOLECULAR LINE SURVEY OF BRIGHT DEBRIS DISKSA. Moór, T. Henning, A. Juhász et al. · 2015 · The Astrophysical Journal · cité 51 fois · Pas encore résumé
Résumé scientifique
Debris disks are considered to be gas-poor, but recent observations revealed molecular or atomic gas in several 10–40 Myr old systems. We used the APEX and IRAM 30 m radio telescopes to search for CO gas in 20 bright debris disks. In one case, around the 16 Myr old A-type star HD 131835, we discovered a new gas-bearing debris disk, where the CO 3–2 transition was successfully detected. No other individual system exhibited a measurable CO signal. Our Herschel Space Observatory far-infrared images of HD 131835 marginally resolved the disk at both 70 and 100 μm, with a characteristic radius of ∼170 AU. While in stellar properties HD 131835 resembles β Pic, its dust disk properties are similar t…
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MOLECULAR GAS IN YOUNG DEBRIS DISKSA. Moór, P. Ábrahám, A. Juhász et al. · 2011 · The Astrophysical Journal Letters · cité 14 fois · Pas encore résumé
Résumé scientifique
Gas-rich primordial disks and tenuous gas-poor debris disks are usually considered as two distinct evolutionary phases of the circumstellar matter. Interestingly, the debris disk around the young main-sequence star 49 Ceti possesses a substantial amount of molecular gas and possibly represents the missing link between the two phases. Motivated to understand the evolution of the gas component in circumstellar disks via finding more 49 Ceti-like systems, we carried out a CO J = 3−2 survey with the Atacama Pathfinder EXperiment, targeting 20 infrared-luminous debris disks. These systems fill the gap between primordial and old tenuous debris disks in terms of fractional luminosity. Here we repor…
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Les articles qui le citent
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Physical Conditions of Gas Components in Debris Disks of 49 Ceti and HD 21997A. Higuchi, Á. Kóspál, A. Moór et al. · 2020 · Astrophysical Journal · cité 6 fois · Pas encore résumé
Résumé scientifique
Characterization of the gas component in debris disks is of fundamental importance for understanding their origin. To address this goal, we have conducted non-LTE (local thermodynamic equilibrium) analyses of the rotational spectral lines of CO including those of rare isotopologues (13CO and C18O) that have been observed toward the gaseous debris disks of 49 Ceti and HD 21997 with the Atacama Large Millimeter/submillimeter Array (ALMA) and the Atacama Compact Array (ACA). The analyses have been carried out for a wide range of H2 density, and the observed line intensities are found to be reproduced as long as the H2 density is higher than 103 cm−3. The CO column density and the gas temperatur…
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Photoevaporation of Grain-depleted Protoplanetary Disks around Intermediate-mass Stars: Investigating the Possibility of Gas-rich Debris Disks as Protoplanetary RemnantsR. Nakatani, H. Kobayashi, R. Kuiper et al. · 2020 · Astrophysical Journal · cité 14 fois · Pas encore résumé
Résumé scientifique
Debris disks are classically considered to be gas-less systems, but recent (sub)millimeter observations have detected tens of those with rich gas content. The origin of the gas component remains unclear, but it could be protoplanetary remnants and/or secondary products from large bodies. In order to be protoplanetary in origin, the gas component of the parental protoplanetary disk is required to survive for ≳10Myr . However, previous models predict ≲10Myr lifetimes because of efficient photoevaporation at the late stage of disk evolution. We investigate photoevaporation of gas-rich, optically-thin disks around intermediate-mass stars at a late stage of the disk evolution. The evolved system …
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The ALMA survey to Resolve exoKuiper belt Substructures (ARKS)S. Mac Manamon, L. Matrá, S. Marino et al. · 2026 · Astronomy & Astrophysics · cité 6 fois · Pas encore résumé
Résumé scientifique
Context . CO gas is detected in a significant number (~20) of debris discs (exoKuiper belts), but understanding its origin and evolution remains elusive. Crucial pieces of evidence are its mass and spectro-spatial distribution, which are coupled through optical depth and have only been analysed at low to moderate resolution so far. The ALMA survey to Resolve exoKuiper belt Substructures (ARKS) is the first ALMA large program to target debris discs at high spectro-spatial resolution. Aims . We used 12 CO and 13 CO J=3-2 line data of 18 debris belts observed by ARKS, 5 of which were already known to be gas-bearing, in order to analyse the spectro-spatial distribution of CO and constrain the ga…
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Résumé scientifique
Constraining the distribution of gas and dust in the inner 20 au of protoplanetary disks is difficult. At the same time, this region is thought to be responsible for most planet formation, especially around the water ice line at 3–10 au. Under the assumption that the gas is in a Keplerian disk, we use the exquisite sensitivity of the Molecules with ALMA at Planet-forming Scales (MAPS) ALMA large program to construct radial surface brightness profiles with a ∼3 au effective resolution for the CO isotopologue J = 2–1 lines using the line velocity profile. IM Lup reveals a central depression in 13CO and C18O that is ascribed to a pileup of ∼500 M ⊕ of dust in the inner 20 au, leading to a gas-t…
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Résumé scientifique
Context . Dusty discs detected around main-sequence stars are thought to be signs of planetesimal belts in which the dust distribution is shaped by collisional and dynamical processes, including interactions with gas if present. The debris disc around the young A-type star HD 131835 is composed of two dust rings at ∼65 au and ∼100 au, a third unconstrained innermost component, and a gaseous component centred at ∼65 au. New ALMA observations show that the inner of the two dust rings is brighter than the outer one, in contrast with previous observations in scattered light. Aims . We explore two scenarios that could explain these observations: the two dust rings might represent distinct planete…
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