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Related papers: Identifying Variability in Deeply Embedded Protost…

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How a star forms is a fundamental question in astrophysics. In the earliest stages of protostellar evolution high extinction prevents a direct study of the accretion processes and their temporal evolution. Monitoring the variations of the…

Instrumentation and Methods for Astrophysics · Physics 2025-12-18 Thomas Stanke , Verena Wolf , Bringfried Stecklum , Doug Johnstone , Jochen Eislöffel , Gregory J. Herczeg , S. Tom Megeath , Karri I. I. Koljonen

We review the recent observations of protoplanetary disks together with relevant theoretical studies with an emphasis on the evolution of volatiles. In the last several years Atacama Large Millimeter/submillimeter Array (ALMA) provided…

Earth and Planetary Astrophysics · Physics 2024-11-05 Yuri Aikawa , Satoshi Okuzumi , Klaus Pontoppidan

We have observed the submillimeter continuum condensation SMM4 in Serpens Main using the Atacama Large Millimeter/submillimeter Array (ALMA) during its Cycle 3 in 1.3 mm continuum, 12CO J=2-1, SO J_N=6_5-5_4, and C18O J=2-1 lines at angular…

Solar and Stellar Astrophysics · Physics 2018-08-15 Yusuke Aso , Naomi Hirano , Yuri Aikawa , Masahiro N. Machida , Shigehisa Takakuwa , Hsi-Wei Yen , Jonathan P. Williams

Context: The R CrA cloud hosts a handful of Class 0/I low-mass young stellar objects. The chemistry and physics at scales $>500$ AU in this cloud are dominated by the irradiation from the nearby Herbig Be star R CrA. The luminous…

Transition disks with large inner dust cavities are thought to host massive companions. However, the disk structure inside the companion orbit and how material flows toward an actively accreting star remain unclear. We present a high…

Earth and Planetary Astrophysics · Physics 2020-04-15 Logan Francis , Nienke van der Marel

We present high-resolution, high-sensitivity observations of the Class 0 protostar RCrA IRS5N as part of the Atacama Large Milimeter/submilimeter Array (ALMA) large program Early Planet Formation in Embedded Disks (eDisk). The 1.3 mm…

Long-baseline interferometry at infrared wavelengths allows the innermost regions around young stars to be observed. These observations directly probe the location of the dust and gas in the disks. The characteristic sizes of these regions…

Solar and Stellar Astrophysics · Physics 2014-11-18 Fabien Malbet

The aim of this study is to demonstrate how the logarithmic millimeter continuum gradient observed using the Atacama Large Millimeter/submillimeter Array (ALMA) may be used to estimate optical thickness in the solar atmosphere. We discuss…

Solar and Stellar Astrophysics · Physics 2019-05-01 Andrew S. Rodger , Nicolas Labrosse , Sven Wedemeyer , Mikolaj Szydlarski , Paulo J. A. Simões , Lyndsay Fletcher

We study the abundance of substructure in the matter density near galaxies using ALMA Science Verification observations of the strong lensing system SDP.81. We present a method to measure the abundance of subhalos around galaxies using…

We have obtained time series observations of the Orion Nebula Cluster at 70 microns and 160 microns from the Herschel/PACS Photometer. This represents the first wide-field far-infrared photometric monitoring of a young star forming region.…

Astrophysics of Galaxies · Physics 2015-06-05 N. Billot , M. Morales-Calderon , J. R. Stauffer , S. T. Megeath , B. Whitney

Though there has been a significant amount of work investigating the early stages of low-mass star formation in recent years, the evolution of the mass assembly rate onto the central protostar remains largely unconstrained. Examining in…

[Abridged] Aims: We provide predictions for ALMA observations of planet gaps that account for the specific spatial distribution of dust that results from consistent gas+dust dynamics. Methods: In a previous work, we ran full 3D, two-fluid…

Earth and Planetary Astrophysics · Physics 2012-08-28 J. -F. Gonzalez , C. Pinte , S. T. Maddison , F. Ménard , L. Fouchet

In order to explain grain growth to mm sized particles and their retention in outer regions of protoplanetary disks, as it is observed at sub-mm and mm wavelengths, we investigate if strong inhomogeneities in the gas density profiles can…

Earth and Planetary Astrophysics · Physics 2012-02-14 P. Pinilla , T. Birnstiel , L. Ricci , C. P. Dullemond , A. L. Uribe , L. Testi , A. Natta

Accurate disk mass measurements are necessary to constrain disk evolution and the timescale of planet formation, but such measurements are difficult to make and are very dependent on assumptions. Here we look at the assumption that the disk…

Solar and Stellar Astrophysics · Physics 2023-01-04 Z. Xin , C. C. Espaillat , A. M. Rilinger , A. Ribas , E. Macias

Stars are born from dense cores in molecular clouds. Observationally, it is crucial to capture the formation of cores in order to understand the necessary conditions and rate of the star formation process. The {\it Atacama Large Mm/sub-mm…

Astrophysics of Galaxies · Physics 2018-03-28 Shuo Kong , Jonathan C. Tan , Héctor G. Arce , Paola Caselli , Francesco Fontani , Michael J. Butler

(Abridged) The physical structure of deeply-embedded low-mass protostars (Class 0) on scales of less than 300 AU is still poorly constrained. Determining this is crucial for understanding the physical and chemical evolution from cores to…

Solar and Stellar Astrophysics · Physics 2016-05-04 M. V. Persson , D. Harsono , J. J. Tobin , E. F. van Dishoeck , J. K. Jørgensen , N. Murillo , S. -P. Lai

We analyze results from the first eighteen months of monthly sub-mm monitoring of eight star-forming regions in the JCMT Transient Survey. In our search for stochastic variability in 1643 bright peaks, only the previously identified source,…

The most complete catalogue of nearby stars (Gliese and Jarheiss, 1991) has been used to search for the stars whose photospheric thermal emission can be detected by the future millimeter array ALMA. We found that 446 nearby stars with…

Astrophysics · Physics 2007-05-23 Jean-Francois Lestrade

Optical and infrared surveys have detected increasing numbers of disc accretion outbursts in young stars. Some models of these FU Ori-type events predict that the outburst should start at near- to mid-infrared wavelengths before an optical…

Solar and Stellar Astrophysics · Physics 2025-11-04 August T. Masley , Lee Hartmann