FAUST – XXVII. The circumbinary disc and the outflow of the L 1551 IRS 5 binary system

ABSTRACT Using continuum and $\mbox{C}^{18}\mbox{O}\:(2-1)$ line data obtained from the large ALMA (Atacama Large Millimeter/submillimeter Array) programme FAUST (Fifty AU STudy of the chemistry in the disc/envelope system of solar-like protostars), we studied the structure of the protostellar binary system L 1551 IRS 5 at scales between 30 and 3000 au to constrain its properties, from the circumstellar and circumbinary discs up to the envelope and outflow scales, which exhibits complex and entangled structures at the scales of its inner and outer envelopes, presumably caused by the influence of the central binary. Assuming a dust-to-gas ratio of 100, we calculated the dust + gas mass for the circumbinary disc and each circumstellar disc of the binary, obtaining 0.018 M$_\odot$ for the circumbinary disc, 0.004 and 0.002 M$_\odot$ for the northern and southern circumstellar disc, respectively. From the line emission, we retrieved the gas masses for each structure component. With the $\mbox{C}^{18}\mbox{O}\:(2-1)$ position–velocity diagram along the circumbinary disc, we were able to constrain the centrifugal barrier, ${r_{CB}=55}$ au, update the specific angular momentum, ${j\sim 270}$ au km s$^{-1}$. We built an analytical model that can be used to predict the influence of the morphology of the outflow and a few dynamic features that can reproduce the system emission, allowing us to explain and discern the outflow contribution from the complex emission due to the binary. Additionally, we inferred the density power-law index, ${\alpha =1.7}$, and the envelope rotation velocity, $\upsilon _{c}=2$ km s$^{-1}$. Finally, the observations gave us the physical constraints to obtain a coherent outflow model for L 1551 IRS 5.

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Publication Details

Journal
Monthly Notices of the Royal Astronomical Society
Published
2025-06-18
DOI
https://doi.org/10.1093/mnras/staf1002
Citations
1
Primary Topic
Astrophysics and Star Formation Studies
Type
article
Field-Weighted Citation Impact
1.15

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article

FAUST – XXVII. The circumbinary disc and the outflow of the L 1551 IRS 5 binary system

A. Miotello, P. R. Rivera-Ortíz, Laurent Loinard, F. Ménard et al.
1 citations
Monthly Notices of the Royal Astronomical Society
Astrophysics and Star Formation Studies
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article

FAUST – XXVII. The circumbinary disc and the outflow of the L 1551 IRS 5 binary system

A. Miotello, P. R. Rivera-Ortíz, Laurent Loinard, F. Ménard, L. Podio, Takeshi Sakai, G. Sabatini, Satoshi Yamamoto, Doug Johnstone, L. Testi, Nicolás Cuello, María José Maureira, Nami Sakai, Aurora Durán, C. J. Chandler, Tomoyuki Hanawa, M. De Simone, C. Codella, C. Vastel, E. Bianchi, Geovanni Cortés-Rangel, P. Caselli, C. Ceccarelli, Ziwei Zhang
article en
1 citations

Abstract

ABSTRACT Using continuum and $\mbox{C}^{18}\mbox{O}\:(2-1)$ line data obtained from the large ALMA (Atacama Large Millimeter/submillimeter Array) programme FAUST (Fifty AU STudy of the chemistry in the disc/envelope system of solar-like protostars), we studied the structure of the protostellar binary system L 1551 IRS 5 at scales between 30 and 3000 au to constrain its properties, from the circumstellar and circumbinary discs up to the envelope and outflow scales, which exhibits complex and entangled structures at the scales of its inner and outer envelopes, presumably caused by the influence of the central binary. Assuming a dust-to-gas ratio of 100, we calculated the dust + gas mass for the circumbinary disc and each circumstellar disc of the binary, obtaining 0.018 M$_\odot$ for the circumbinary disc, 0.004 and 0.002 M$_\odot$ for the northern and southern circumstellar disc, respectively. From the line emission, we retrieved the gas masses for each structure component. With the $\mbox{C}^{18}\mbox{O}\:(2-1)$ position–velocity diagram along the circumbinary disc, we were able to constrain the centrifugal barrier, ${r_{CB}=55}$ au, update the specific angular momentum, ${j\sim 270}$ au km s$^{-1}$. We built an analytical model that can be used to predict the influence of the morphology of the outflow and a few dynamic features that can reproduce the system emission, allowing us to explain and discern the outflow contribution from the complex emission due to the binary. Additionally, we inferred the density power-law index, ${\alpha =1.7}$, and the envelope rotation velocity, $\upsilon _{c}=2$ km s$^{-1}$. Finally, the observations gave us the physical constraints to obtain a coherent outflow model for L 1551 IRS 5.

Monthly Notices of the Royal Astronomical SocietyVol. 541(1)
Herzberg Institute of Astrophysics (CA), Centre National de la Recherche Scientifique (FR), Woodwell Climate Research Center (US), Université Toulouse III - Paul Sabatier (FR), Harvard University (US), Pioneer (United States) (US), Chiba University (JP), Université Fédérale de Toulouse Midi-Pyrénées (FR), The Graduate University for Advanced Studies, SOKENDAI (JP), University of Electro-Communications (JP), University of Victoria (CA), National Radio Astronomy Observatory (US), Arcetri Astrophysical Observatory (IT), Max Planck Institute for Extraterrestrial Physics (DE), RIKEN (JP), Istituto Nazionale di Fisica Nucleare, Sezione di Bologna (IT), The University of Tokyo (JP), Universidad Nacional Autónoma de México (MX), Université Grenoble Alpes (FR)
National Science Foundation, National Radio Astronomy Observatory, European Commission, National Science Council, Consejo Nacional de Ciencia y Tecnología, Korea Astronomy and Space Science Institute, National Astronomical Observatory of Japan, HORIZON EUROPE Framework Programme, Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México, National Institutes of Natural Sciences
Openalex Percentile: Top 18%
Astrophysics and Star Formation Studies
1.15
DOIOpen Access PDFOpenAlex
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