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Karlsson, Mikael
Publications (10 of 113) Show all publications
Haas, J., Vargas Catalan, E., Piron, P., Karlsson, M. & Mizaikoff, B. (2018). Analyzing Glucose in Human Saliva with Broadly Tunable Quantum Cascade Lasers and Polycrystalline Diamond Waveguides. Analyst
Open this publication in new window or tab >>Analyzing Glucose in Human Saliva with Broadly Tunable Quantum Cascade Lasers and Polycrystalline Diamond Waveguides
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2018 (English)In: Analyst, ISSN 0003-2654Article in journal (Refereed) Submitted
National Category
Engineering and Technology Analytical Chemistry
Identifiers
urn:nbn:se:uu:diva-346526 (URN)
Available from: 2018-03-19 Created: 2018-03-19 Last updated: 2018-05-21
Piron, P., Vargas Catalan, E., Absil, O. & Karlsson, M. (2018). Birefringence measurements of diamond space-variant subwavelength gratings. Applied Optics, 57(17), 4909-4917
Open this publication in new window or tab >>Birefringence measurements of diamond space-variant subwavelength gratings
2018 (English)In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 57, no 17, p. 4909-4917Article in journal (Refereed) Published
National Category
Engineering and Technology Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:uu:diva-346522 (URN)10.1364/AO.57.004909 (DOI)
Available from: 2018-03-19 Created: 2018-03-19 Last updated: 2018-06-09
Haas, J., Vargas Catalan, E., Piron, P., Nikolajeff, F., Österlund, L., Karlsson, M. & Mizaikoff, B. (2018). Polycrystalline diamond thin-film waveguides for mid-infrared evanescent field sensors. ACS Omega, 3, 6190-6198
Open this publication in new window or tab >>Polycrystalline diamond thin-film waveguides for mid-infrared evanescent field sensors
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2018 (English)In: ACS Omega, ISSN 2470-1343, Vol. 3, p. 6190-6198Article in journal (Refereed) Published
National Category
Engineering and Technology Analytical Chemistry
Identifiers
urn:nbn:se:uu:diva-346523 (URN)10.1021/acsomega.8b00623 (DOI)
Available from: 2018-03-19 Created: 2018-03-19 Last updated: 2018-06-23
Mawet, D., Choquet, É., Absil, O., Huby, E., Bottom, M., Serabyn, E., . . . Vargas Catalan, E. (2017). Characterization of the inner disk around HD 141569 A from KECK/NIRC2 L-band vortex coronagraphy. Astronomical Journal, 153(1), 1-10, Article ID 44.
Open this publication in new window or tab >>Characterization of the inner disk around HD 141569 A from KECK/NIRC2 L-band vortex coronagraphy
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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.

Keywords
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:nbn:se:uu:diva-311377 (URN)10.3847/1538-3881/153/1/44 (DOI)000405784300002 ()
Available from: 2016-12-26 Created: 2016-12-26 Last updated: 2018-03-23Bibliographically approved
Hamberg, M., Vargas Catalan, E., Karlsson, M., Dancila, D., Rydberg, A., Ögren, J., . . . Vartiainen, I. (2017). Dielectric Laser Acceleration Setup Design, Grating Manufacturing and Investigations Into Laser Induced RF Cavity Breakdowns. In: Proceedings of FEL2017, Santa Fe, NM, USA: . Paper presented at 38th International Free-Electron Laser Conference, Santa Fe, 20-25 Aug..
Open this publication in new window or tab >>Dielectric Laser Acceleration Setup Design, Grating Manufacturing and Investigations Into Laser Induced RF Cavity Breakdowns
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2017 (English)In: Proceedings of FEL2017, Santa Fe, NM, USA, 2017Conference paper, Published paper (Refereed)
National Category
Accelerator Physics and Instrumentation Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-336087 (URN)978-3-95450-179-3 (ISBN)
Conference
38th International Free-Electron Laser Conference, Santa Fe, 20-25 Aug.
Available from: 2017-12-12 Created: 2017-12-12 Last updated: 2017-12-14Bibliographically approved
Milli, J., Hibon, P., Christiaens, V., Choquet, É., Bonnefoy, M., Kennedy, G., . . . Wahhaj, Z. (2017). Discovery of a low-mass companion inside the debris ring surrounding the F5V star HD 206893. Astronomy and Astrophysics, 597, Article ID L2.
Open this publication in new window or tab >>Discovery of a low-mass companion inside the debris ring surrounding the F5V star HD 206893
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2017 (English)In: Astronomy and Astrophysics, ISSN 0004-6361, E-ISSN 1432-0746, Vol. 597, article id L2Article in journal (Refereed) Published
Abstract [en]

Aims. Uncovering the ingredients and the architecture of planetary systems is a very active field of research that has fuelled many new theories on giant planet formation, migration, composition, and interaction with the circumstellar environment. We aim at discovering and studying new such systems, to further expand our knowledge of how low-mass companions form and evolve.

Methods. We obtained high-contrast H-band images of the circumstellar environment of the F5V star HD 206893, known to host a debris disc never detected in scattered light. These observations are part of the SPHERE High Angular Resolution Debris Disc Survey (SHARDDS) using the InfraRed Dual-band Imager and Spectrograph (IRDIS) installed on VLT/SPHERE.

Results. We report the detection of a source with a contrast of 3.6 × 10−5 in the H-band, orbiting at a projected separation of 270 milliarcsecond or 10 au, corresponding to a mass in the range 24 to 73MJup for an age of the system in the range 0.2 to 2 Gyr. The detection was confirmed ten months later with VLT/NaCo, ruling out a background object with no proper motion. A faint extended emission compatible with the disc scattered light signal is also observed.

Conclusions. The detection of a low-mass companion inside a massive debris disc makes this system an analog of other young planetary systems such as β Pictoris, HR 8799 or HD 95086 and requires now further characterisation of both components to understand their interactions.

National Category
Engineering and Technology Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-309599 (URN)10.1051/0004-6361/201629908 (DOI)000392392900143 ()
Funder
EU, FP7, Seventh Framework Programme, 337569
Available from: 2016-12-05 Created: 2016-12-05 Last updated: 2017-11-29Bibliographically approved
Almandoz-Gil, L., Welander, H., Ihse, E., Emami Khoonsari, P., Musunuri, S., Lendel, C., . . . Bergström, J. (2017). Low molar excess of 4-oxo-2-nonenal and 4-hydroxy-2-nonenal promote oligomerization of alpha-synuclein through different pathways. Free Radical Biology & Medicine, 110, 421-431
Open this publication in new window or tab >>Low molar excess of 4-oxo-2-nonenal and 4-hydroxy-2-nonenal promote oligomerization of alpha-synuclein through different pathways
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2017 (English)In: Free Radical Biology & Medicine, ISSN 0891-5849, E-ISSN 1873-4596, Vol. 110, p. 421-431Article in journal (Refereed) Published
National Category
Medical and Health Sciences Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-326663 (URN)10.1016/j.freeradbiomed.2017.07.004 (DOI)000406049200038 ()28690195 (PubMedID)
Funder
Swedish Research Council, 2011-4519, 2012-2172, 2010-6745Marianne and Marcus Wallenberg FoundationThe Swedish Brain FoundationSwedish Society of MedicineÅke Wiberg Foundation
Available from: 2017-07-19 Created: 2017-07-19 Last updated: 2018-02-23Bibliographically approved
Serabyn, E., Huby, E., Matthews, K., Mawet, D., Absil, O., Femenia, B., . . . Wertz, O. (2017). The W. M. Keck Observatory infrared vortex coronagraph and a first image of HIP79124 B. Astronomical Journal, 153(1), 1-7, Article ID 43.
Open this publication in new window or tab >>The W. M. Keck Observatory infrared vortex coronagraph and a first image of HIP79124 B
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2017 (English)In: Astronomical Journal, ISSN 0004-6256, E-ISSN 1538-3881, Vol. 153, no 1, p. 1-7, article id 43Article in journal (Refereed) Published
Abstract [en]

An optical vortex coronagraph has been implemented within the NIRC2 camera on the Keck II telescope and used to carry out on-sky tests and observations. The development of this new L′-band observational mode is described, and an initial demonstration of the new capability is presented: a resolved image of the low-mass companion to HIP 79124, which had previously been detected by means of interferometry. With HIP 79124 B at a projected separation of 186.5 mas, both the small inner working angle of the vortex coronagraph and the related imaging improvements were crucial in imaging this close companion directly. Due to higher Strehl ratios and more relaxed contrasts in L′ band versus H band, this new coronagraphic capability will enable high-contrast, small-angle observations of nearby young exoplanets and disks on a par with those of shorter-wavelength extreme adaptive optics coronagraphs.

Keywords
instrumentation: adaptive optics
National Category
Engineering and Technology Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-311385 (URN)10.3847/1538-3881/153/1/43 (DOI)000405784300001 ()
Funder
EU, FP7, Seventh Framework Programme, 337569Swedish Research Council, 621-2014-5959
Available from: 2016-12-26 Created: 2016-12-26 Last updated: 2018-03-23Bibliographically approved
Gonzalez, C. A., Wertz, O., Absil, O., Christiaens, V., Defrère, D., Mawet, D., . . . Surdej, J. (2017). VIP: Vortex Image Processing Package for High-contrast Direct Imaging. Astronomical Journal, 154(1), Article ID 7.
Open this publication in new window or tab >>VIP: Vortex Image Processing Package for High-contrast Direct Imaging
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2017 (English)In: Astronomical Journal, ISSN 0004-6256, E-ISSN 1538-3881, Vol. 154, no 1, article id 7Article in journal (Refereed) Published
Abstract [en]

We present the Vortex Image Processing (VIP) library, a python package dedicated to astronomical high-contrast imaging. Our package relies on the extensive python stack of scientific libraries and aims to provide a flexible framework for high-contrast data and image processing. In this paper, we describe the capabilities of VIP related to processing image sequences acquired using the angular differential imaging (ADI) observing technique. VIP implements functionalities for building high-contrast data processing pipelines, encompassing pre- and post-processing algorithms, potential source. position and flux estimation, and sensitivity curve. generation. Among the reference point-spread. function subtraction techniques for ADI post-processing, VIP includes several flavors of principal component analysis (PCA) based algorithms, such as annular PCA and incremental PCA algorithms capable of processing big datacubes (of several gigabytes) on a computer with limited memory. Also, we present a novel ADI algorithm based on non-negative matrix factorization, which comes from the same family of low-rank matrix approximations as PCA and provides fairly similar results. We showcase the ADI capabilities of the VIP library using a deep sequence on HR 8799 taken with the LBTI/LMIRCam and its recently commissioned L-band vortex coronagraph. Using VIP, we investigated the presence of additional companions around HR 8799 and did not find any significant additional point source beyond the four known planets. VIP is available at http://github. com/vortex-exoplanet/VIP and is accompanied with Jupyter notebook tutorials illustrating the main functionalities of the library.

National Category
Engineering and Technology Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-298322 (URN)10.3847/1538-3881/aa73d7 (DOI)000403478000002 ()
Funder
EU, FP7, Seventh Framework Programme, 337569
Available from: 2016-07-01 Created: 2016-07-01 Last updated: 2017-09-14Bibliographically approved
Cai, Y., Li, H., Karlsson, M., Leifer, K., Engqvist, H. & Xia, W. (2016). Biomineralization on Single Crystalline Rutile: The Modulated Growth of Hydroxyapatite by Fibronectin in a Simulated Body Fluid. RSC Advances, 6, 35507-35516
Open this publication in new window or tab >>Biomineralization on Single Crystalline Rutile: The Modulated Growth of Hydroxyapatite by Fibronectin in a Simulated Body Fluid
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2016 (English)In: RSC Advances, ISSN 2046-2069, E-ISSN 2046-2069, Vol. 6, p. 35507-35516Article in journal (Refereed) Published
Abstract [en]

The aim of this study is to probe the complex interaction between surface bioactivity and protein adsorption on single crystalline rutile. Our previous studies have shown that single crystalline rutile possessed in vitro bioactivity and the crystalline faces affected the hydroxyapatite (HA) formation. However, upon implantation, a fast adsorption of proteins, from the biological fluids, is intermediated by a water layer towards the biomaterial interface. Thus the effect of protein on the bioactivity must be addressed. In this study, the HA growth dynamics on (001), (100) and (110) faces was investigated in a simulated body fluid with the presence of fibronectin (FN) by two different processes. The surface adhesion of each face before and after FN adsorption, as revealed by direct numerical values, was determined by atomic force microscopy (AFM) based peak force quantitative nanomechanical mapping (PF-QNM) for the first time. The findings suggest the surface energies of FN pre-adsorbed (001), (100) and (110) faces have been enhanced, leading to the subsequent accelerated HA formation. Furthermore, (001) and (100) faces were found to have larger coverage of HA crystals than (110) face at an early stage. In addition, various characterizations were performed to probe the chemical and crystal structures of as-grown biomimetic HA crystals, and in particular, the Ca/P ratio variations at different soaking time points.

National Category
Engineering and Technology Materials Chemistry
Identifiers
urn:nbn:se:uu:diva-277120 (URN)10.1039/C6RA04303H (DOI)000374349600042 ()
Available from: 2016-02-17 Created: 2016-02-17 Last updated: 2018-02-08Bibliographically approved
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