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Sökning: id:"swepub:oai:research.chalmers.se:be119f70-a04c-41fb-b11a-4f8185cc1e63" > Revisiting the case...

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

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

  • Artikel/kapitelEngelska2018

Förlag, utgivningsår, omfång ...

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

Nummerbeteckningar

  • 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

Kompletterande språkuppgifter

  • Språk:engelska
  • Sammanfattning på:engelska

Ingår i deldatabas

Klassifikation

  • Ämneskategori:art swepub-publicationtype
  • Ämneskategori:ref swepub-contenttype

Anmärkningar

  • 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.

Ämnesord och genrebeteckningar

Biuppslag (personer, institutioner, konferenser, titlar ...)

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

Sammanhörande titlar

  • Ingår i:Astronomy and Astrophysics: EDP Sciences6170004-63611432-0746

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