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  • Alonso-Albi, T.Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN) (author)

Revisiting the case of R Monocerotis: Is CO removed at R

  • Article/chapterEnglish2018

Publisher, publication year, extent ...

  • 2018-09-12
  • EDP Sciences,2018
  • electronicrdacarrier

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  • LIBRIS-ID:oai:research.chalmers.se:be119f70-a04c-41fb-b11a-4f8185cc1e63
  • https://research.chalmers.se/publication/505152URI
  • https://doi.org/10.1051/0004-6361/201731658DOI

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  • Language:English
  • Summary in:English

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

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  • Context. To our knowledge, R Mon is the only B0 star in which a gaseous Keplerian disk has been detected. However, there is some controversy about the spectral type of R Mon. Some authors propose that it could be a later B8e star, where disks are more common. Aims. Our goal is to re-evaluate the R Mon spectral type and characterize its protoplanetary disk. Methods. The spectral type of R Mon has been re-evaluated using the available continuum data and UVES emission lines. We used a power-law disk model to fit previous12CO 1 →0 and 2 →1 interferometric observations and the PACS CO data to investigate the disk structure. Interferometric detections of13CO J = 1 →0, HCO+1 →0, and CN 1 →0 lines using the IRAM Plateau de Bure Interferometer (PdBI) are presented. The HCN 1 →0 line was not detected. Results. Our analysis confirms that R Mon is a B0 star. The disk model compatible with the12CO 1 →0 and 2 →1 interferometric observations falls short of predicting the observed fluxes of the 14 < Ju< 31 PACS lines; this is consistent with the scenario in which some contribution to these lines is coming from a warm envelope and/or UV-illuminated outflow walls. More interestingly, the upper limits to the fluxes of the Ju> 31 CO lines suggest the existence of a region empty of CO at R ? 20 au in the protoplanetary disk. The intense emission of the HCO+and CN lines shows the strong influence of UV photons on gas chemistry. Conclusions. The observations gathered in this paper are consistent with the presence of a transition disk with a cavity of Rin≥ 20 au around R Mon. This size is similar to the photoevaporation radius that supports the interpretation that UV photoevaporation is main disk dispersal mechanism in massive stars.

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  • Riviere-Marichalar, P.CSIC - Instituto de Ciencia de Materiales de Madrid (ICMM) (author)
  • Fuente, A.Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN) (author)
  • Pacheco-Vázquez, S.Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN) (author)
  • Montesinos, B.Centro de Astrobiologia (CAB) (author)
  • Bachiller, R.Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN) (author)
  • Treviño Morales, Sandra,1985CSIC - Instituto de Ciencia de Materiales de Madrid (ICMM),Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)trevino (author)
  • Observatorio Astronómico Nacional (OAN)CSIC - Instituto de Ciencia de Materiales de Madrid (ICMM) (creator_code:org_t)

Related titles

  • In:Astronomy and Astrophysics: EDP Sciences6170004-63611432-0746

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