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Characterization of the inner disk around HD 141569 A from KECK/NIRC2 L-band vortex coronagraphy
California Institute of Technology/Jet Propulsion Laboratory (NASA), USA.
Jet Propulsion Laboratory (NASA), USA.
Université de Liège, Belgium.
Université de Liège, Belgium.
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2017 (English)In: Astronomical Journal, ISSN 0004-6256, E-ISSN 1538-3881, Vol. 153, no 1, p. 1-10, article id 44Article in journal (Refereed) Published
Abstract [en]

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 ;23 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.

Place, publisher, year, edition, pages
2017. Vol. 153, no 1, p. 1-10, article id 44
Keywords [en]
planet-disk interactions; planetary systems; planets and satellites: formation; protoplanetary disks; stars: pre-main sequence; stars: variables: T Tauri, Herbig Ae/Be
National Category
Engineering and Technology Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:uu:diva-311377DOI: 10.3847/1538-3881/153/1/44ISI: 000405784300002OAI: oai:DiVA.org:uu-311377DiVA, id: diva2:1059926
Available from: 2016-12-26 Created: 2016-12-26 Last updated: 2018-03-23Bibliographically approved
In thesis
1. Microfabrication of Optical Components in Synthetic Diamond: Infrared Optics for Applications  in Astronomy and Spectroscopy
Open this publication in new window or tab >>Microfabrication of Optical Components in Synthetic Diamond: Infrared Optics for Applications  in Astronomy and Spectroscopy
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Infrared optics is a broad general term, relevant to a range of fields. The manufactured diamond optical components utilized within this thesis were applied to both astronomy, in which direct imaging of star system using large ground-based telescopes and diamond coronagraphs was performed, and in absorption spectroscopy probing solvents and proteins using a tuneable quantum cascade laser and diamond waveguides.

The optical components presented in this thesis are all made from diamond, as it is one of few materials that is transparent in the infrared regime. Furthermore, diamond has other unique properties that include high thermal conductivity, low thermal expansion and chemically inertness. In this thesis synthetic diamond grown by chemical vapor deposition has been used, using commercially available components and equipment.

The focus of this thesis was to produce optical gratings for different applications using plasma etching. The first steps involved understanding the etch process and optimizing the plasma etch parameters to enable the fabrication of new types of nano/micro meter sized structures in diamond. Optimization of the etch masks is also included in the work. With this newfound knowledge, deeper and narrower optical gratings than before could be realized.

Optical evaluation of the gratings in special designed optical test benches was used to determine the coronagraphic performance of the manufactured diamond coronagraphs. Most often the designed etch depth could not be reached in the first attempt and therefore a post-fabrication method for tuning the etch depth was developed.  This showed to be vital to realising high performing diamond coronagraphs. Diamond coronagraphs were also installed in several ground based telescopes and discovery of new astronomical objects are presented. With deeper understanding of the etch process more complex coronagraphs in diamond were manufactured opening up for use in the next generation of giant telescopes.

In the second part of this thesis, fabrication of diamond waveguides for sensitive analysis of solvents and proteins using infrared spectroscopy is presented.  Different designs of diamond waveguides are demonstrated and initial analysis of organic compounds and glucose using a quantum cascade laser as the light source is presented. This type of biosensor will be used to study the secondary structure of proteins relevant for different diseases.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2018. p. 71
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1653
Keywords
Diamond, microfabrication, microoptics, astronomy, IR-spectroscopy, corongraph, waveguide
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-346531 (URN)978-91-513-0293-5 (ISBN)
Public defence
2018-05-18, Siegbahnsalen, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:00 (English)
Opponent
Supervisors
Available from: 2018-04-27 Created: 2018-03-23 Last updated: 2018-05-22

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Forsberg, PontusKarlsson, MikaelPiron, PierreVargas Catalan, Ernesto

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