Characterization of the Inner Disk around HD 141569 A from Keck/NIRC2 L-Band Vortex Coronagraphy
In: Astronomical Journal, 153(1), Art. No. 44, (2017-01, 2017
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Zugriff:
HD 141569 A is a pre-main sequence B9.5 Ve star surrounded by a prominent and complex circumstellar disk, likely still in a transition stage from protoplanetary to debris disk phase. Here, we present a new image of the third inner disk component of HD 141569 A made in the L' band (3.8 μm) during the commissioning of the vector vortex coronagraph that has recently been installed in the near-infrared imager and spectrograph NIRC2 behind the W.M. Keck Observatory Keck II adaptive optics system. We used reference point-spread function subtraction, which reveals the innermost disk component from the inner working distance of sime23 au and up to ≃70 au. The spatial scale of our detection roughly corresponds to the optical and near-infrared scattered light, thermal Q, N, and 8.6 μm PAH emission reported earlier. We also see an outward progression in dust location from the L' band to the H band (Very Large Telescope/SPHERE image) to the visible (Hubble Space Telescope (HST)/STIS image), which is likely indicative of dust blowout. The warm disk component is nested deep inside the two outer belts imaged by HST-NICMOS in 1999 (at 406 and 245 au, respectively). We fit our new L'-band image and spectral energy distribution of HD 141569 A with the radiative transfer code MCFOST. Our best-fit models favor pure olivine grains and are consistent with the composition of the outer belts. While our image shows a putative very faint point-like clump or source embedded in the inner disk, we did not detect any true companion within the gap between the inner disk and the first outer ring, at a sensitivity of a few Jupiter masses. ; © 2017. The American Astronomical Society. Received 2016 September 22; revised 2016 October 31; accepted 2016 November 16; published 2017 January 4. Based on observations made at the W.M. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made ...
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Characterization of the Inner Disk around HD 141569 A from Keck/NIRC2 L-Band Vortex Coronagraphy
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Autor/in / Beteiligte Person: | Mawet, Dimitri ; Choquet, Élodie ; Absil, Olivier ; Huby, Elsa ; Bottom, Michael ; Serabyn, Eugene ; Femenia, Bruno ; Lebreton, Jérémy ; Matthews, Keith ; Gomez Gonzalez, Carlos A. ; Wertz, Olivier ; Carlomagno, Brunella ; Christiaens, Valentin ; Defrère, Denis ; Delacroix, Christian ; Forsberg, Pontus ; Habraken, Serge ; Jolivet, Aissa ; Karlsson, Mikael ; Milli, Julien ; Pinte, Christophe ; Piron, Pierre ; Reggiani, Maddalena ; Surdej, Jean ; Vargas Catalan, Ernesto |
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Zeitschrift: | Astronomical Journal, 153(1), Art. No. 44, (2017-01, 2017 |
Veröffentlichung: | American Astronomical Society, 2017 |
Medientyp: | academicJournal |
DOI: | 10.3847/1538-3881/153/1/44 |
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