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|Title:||On the Asymmetry of the OH Ro-vibrational Lines in HD 100546||Authors:||FEDELE , DAVIDE
van den Ancker, M. E.
|Issue Date:||2015||Journal:||THE ASTROPHYSICAL JOURNAL||Number:||800||Issue:||1||First Page:||23||Abstract:||We present multi-epoch high-spectral resolution observations with VLT/CRIRES of the OH doublet <SUP>2</SUP>Π<SUB>3/2</SUB> P4.5 (1+, 1-) (2.934 μm) toward the protoplanetary disk around HD 100546. The OH doublet is detected at all epochs and is spectrally resolved while nearby H<SUB>2</SUB>O lines remain undetected. The OH line velocity profile is different in the three data sets: in the first epoch (2012 April, P.A. = 26°) the OH lines are symmetric and line broadening is consistent with the gas being in Keplerian rotation around the star. No OH emission is detected within a radius of 8-11 AU from the star: the line emitting region is similar in size and extent to that of the CO ro-vibrational lines. In the other two epochs (2013 March and 2014 April, P.A. = 90° and 10°, respectively) the OH lines appear asymmetric and fainter compared to 2012 April. We investigate the origin of these line asymmetries which were taken by previous authors as evidence for tidal interaction between a (unseen) massive planet and the disk. We show that the observed asymmetries can be fully explained by a misalignment of the slit of the order of 0.''04-0.''20 with respect to the stellar position. The disk is spatially resolved and the slit misalignment is likely caused by the extended dust emission which is brighter than the stellar photosphere at near-infrared wavelengths which is the wavelength used for the pointing. This can cause the photo-center of HD 100546 to be misaligned with the stellar position at near-infrared wavelengths. Based on observations collected at the European Southern Observatory, Paranal, Chile (Proposal ID: 075.C-0172, 084.C-0685A, 088.C-0277, 090.C-0571, 093.C-0674).||Acknowledgments:||We are grateful to the VLT telescope operators and astronomers who performed the CRIRES observations in service mode. We thank R. Hein Bertelsen for providing the median CO ro-vibrational profiles and G. van der Plas for providing the [O i ] data. D.F. thanks S. Brittain for an interesting discussion and for providing the PHOENIX spectrum. We thank J. Smoker and A. Smette for discussion on slit centering with CRIRES and the ESO USD for providing the log files. D.F. thanks J. Bouwmann for providing the ISO spectrum of HD 100546 and T. Müller for further useful discussion on the WISE photometry. We are grateful to the anonymous referee for providing useful comments and suggestions. Facility: VLT:Antu||URI:||http://hdl.handle.net/20.500.12386/24208||URL:||https://iopscience.iop.org/article/10.1088/0004-637X/800/1/23||ISSN:||0004-637X||DOI:||10.1088/0004-637X/800/1/23||Bibcode ADS:||2015ApJ...800...23F||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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checked on Sep 18, 2020
checked on Sep 18, 2020
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