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

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

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

Riviere-Marichalar, P. (author): CSIC - Instituto de Ciencia de Materiales de Madrid (ICMM)

Fuente, A. (author): Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)

Pacheco-Vázquez, S. (author): Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)

Montesinos, B. (author): Centro de Astrobiologia (CAB)

Bachiller, R. (author): Observatorio Astronómico Nacional (OAN),Spanish National Observatory (OAN)

Treviño Morales, Sandra, 1985 (author): CSIC - Instituto de Ciencia de Materiales de Madrid (ICMM),Chalmers tekniska högskola,Chalmers University of Technology

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2018-09-12
2018
English.
In: Astronomy and Astrophysics. - : EDP Sciences. - 0004-6361 .- 1432-0746. ; 617

Related links:: https://research.cha... (primary) (free); show more...; https://www.aanda.or...; https://research.cha...; https://doi.org/10.1...; show less...

Journal article (peer-reviewed)

Abstract Subject headings

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.

Subject headings

NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
NATURVETENSKAP -- Fysik -- Annan fysik (hsv//swe)
NATURAL SCIENCES -- Physical Sciences -- Other Physics Topics (hsv//eng)

Keyword

Circumstellar matter
Stars: formation
Stars: emission-line, Be

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