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  • Taquet, V.Osservatorio Astrofisico di Arcetri,Arcetri Astrophysical Observatory (author)

Interferometric observations of warm deuterated methanol in the inner regions of low-mass protostars

  • Article/chapterEnglish2019

Publisher, publication year, extent ...

  • 2019-11-22
  • EDP Sciences,2019

Numbers

  • LIBRIS-ID:oai:research.chalmers.se:c95677cc-db0b-4d9a-a5dc-9a614f62ec42
  • https://research.chalmers.se/publication/514215URI
  • https://doi.org/10.1051/0004-6361/201936044DOI

Supplementary language notes

  • Language:English
  • Summary in:English

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  • Subject category:art swepub-publicationtype
  • Subject category:ref swepub-contenttype

Notes

  • Methanol is a key species in astrochemistry because it is the most abundant organic molecule in the interstellar medium and is thought to be the mother molecule of many complex organic species. Estimating the deuteration of methanol around young protostars is of crucial importance because it highly depends on its formation mechanisms and the physical conditions during its moment of formation. We analyse several dozen transitions from deuterated methanol isotopologues coming from various existing observational datasets obtained with the IRAM-PdBI and ALMA sub-millimeter interferometers to estimate the methanol deuteration surrounding three low-mass protostars on Solar System scales. A population diagram analysis allows us to derive a [CH2DOH]/[CH3OH] abundance ratio of 3-6% and a [CH3OD]/[CH3OH] ratio of 0.4-1.6%in the warm inner (≤100-200 AU) protostellar regions. These values are typically ten times lower than those derived with previous single-dish observations towards these sources, but they are one to two orders of magnitude higher than the methanol deuteration measured in massive hot cores. Dust temperature maps obtained from Herschel and Planck observations show that massive hot cores are located in warmer molecular clouds than low-mass sources, with temperature differences of ∼10 K. The comparison of our measured values with the predictions of the gas-grain astrochemical model GRAINOBLE shows that such a temperature difference is sufficient to explain the different deuteration observed in low- to high-mass sources. This suggests that the physical conditions of the molecular cloud at the origin of the protostars mostly govern the present-day observed deuteration of methanol and therefore of more complex organic molecules. Finally, the methanol deuteration measured towards young solar-type protostars on Solar System scales seems to be higher by a factor of ∼5 than the upper limit in methanol deuteration estimated in comet Hale-Bopp. If this result is confirmed by subsequent observations of other comets, it would imply that an important reprocessing of the organic material likely occurred in the solar nebula during the formation of the Solar System.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Bianchi, E.Université Grenoble Alpes,Grenoble Alpes University,Osservatorio Astrofisico di Arcetri,Arcetri Astrophysical Observatory (author)
  • Codella, C.Osservatorio Astrofisico di Arcetri,Arcetri Astrophysical Observatory,Université Grenoble Alpes,Grenoble Alpes University (author)
  • Persson, Magnus V.,1983Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)magnpe (author)
  • Ceccarelli, C.Université Grenoble Alpes,Grenoble Alpes University (author)
  • Cabrit, S.LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres, France (author)
  • Jørgensen, Jes K.Niels Bohr Institute (author)
  • Kahane, C.Université Grenoble Alpes,Grenoble Alpes University (author)
  • López-Sepulcre, A.Université Grenoble Alpes,Grenoble Alpes University,Institut de Radioastronomie Millimétrique (IRAM) (author)
  • Neri, R.Institut de Radioastronomie Millimétrique (IRAM) (author)
  • Osservatorio Astrofisico di ArcetriUniversité Grenoble Alpes (creator_code:org_t)

Related titles

  • In:Astronomy and Astrophysics: EDP Sciences6320004-63611432-0746

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