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Stempels, H. C.
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Publications (10 of 57) Show all publications
Follert, R., Taubert, D., Hollandt, J., Monte, C., Oliva, E., Seemann, U., . . . Tordo, S. (2016). Characterizing the cross dispersion reflection gratings of CRIRES. In: Advances In Optical And Mechanical Technologies For Telescopes And Instrumentation Ii: . Paper presented at Conference on Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, JUN 26-JUL 01, 2016, Edinburgh, ENGLAND. , Article ID UNSP 99122B.
Open this publication in new window or tab >>Characterizing the cross dispersion reflection gratings of CRIRES
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2016 (English)In: Advances In Optical And Mechanical Technologies For Telescopes And Instrumentation Ii, 2016, article id UNSP 99122BConference paper, Published paper (Refereed)
Abstract [en]

The CRIRES+ project attempts to upgrade the CRIRES instrument into a cross dispersed echelle spectrograph with a simultaneous recording of 8-10 diffraction orders. In order to transform the CRIRES spectrograph into a cross-dispersing instrument, a set of six reflection gratings, each one optimized for one of the wavelength bands CRIRES+ will operate in (YJHKLM), will be used as cross dispersion elements in CRIRES+. Due to the upgrade nature of the project, the choice of gratings depends on the fixed geometry of the instrument. Thus, custom made gratings would be required to achieve the ambitious design goals. Custom made gratings have the disadvantage, though, that they come at an extraordinary price and with lead times of more than 12 months. To mitigate this, a set of off-the-shelf gratings was obtained which had grating parameters very close to the ones being identified as optimal. To ensure that the rigorous specifications for CRIRES+ will be fulfilled, the CRIRES+ team started a collaboration with the Physikalisch-Technische Bundesanstalt Berlin (PTB) to characterize gratings under conditions similar to the operating conditions in CRIRES+ (angle of incidence, wavelength range). The respective test setup was designed in collaboration between PTB and the CRIRES+ consortium. The PTB provided optical radiation sources and calibrated detectors for each wavelength range. With this setup, it is possible to measure the absolute efficiency of the gratings both wavelength dependent and polarization state dependent in a wavelength range from 0.9 mu m to 6 mu m.

Series
Proceedings of SPIE, ISSN 0277-786X ; 9912
Keywords
CRIRES+, echelle spectrograph, infrared instrumentation, VLT, diffraction efficiency
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-311408 (URN)10.1117/12.2232569 (DOI)000387747900072 ()9781510602038; 9781510602045 (ISBN)
Conference
Conference on Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, JUN 26-JUL 01, 2016, Edinburgh, ENGLAND
Available from: 2016-12-27 Created: 2016-12-27 Last updated: 2016-12-27Bibliographically approved
Marconi, A., Di Marcantonio, P., D'Odorico, V., Cristiani, S., Maiolino, R., Oliva, E., . . . Zackrisson, E. (2016). EELT-HIRES the high-resolution spectrograph for the E-ELT. In: Christopher J Evans (Ed.), GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VI: . Paper presented at Conference on Ground-Based and Airborne Instrumentation for Astronomy VI, JUN 26-30, 2016, Edinburgh, SCOTLAND. , 9908, Article ID UNSP 990823.
Open this publication in new window or tab >>EELT-HIRES the high-resolution spectrograph for the E-ELT
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2016 (English)In: GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VI / [ed] Christopher J Evans, 2016, Vol. 9908, article id UNSP 990823Conference paper, Published paper (Refereed)
Abstract [en]

The first generation of E-ELT instruments will include an optical infrared High Resolution Spectrograph, conventionally indicated as EELT-HIRES, which will be capable of providing unique breakthroughs in the fields of exoplanets, star and planet formation, physics and evolution of stars and galaxies, cosmology and fundamental physics. A 2-year long phase A study for EELT-HIRES has just started and will be performed by a consortium composed of institutes and organisations from Brazil, Chile, Denmark, France, Germany, Italy, Poland, Portugal, Spain, Sweden, Switzerland and United Kingdom. In this paper we describe the science goals and the preliminary technical concept for EELT-HIRES which will be developed during the phase A, as well as its planned development and consortium organisation during the study.

Series
Proceedings of SPIE, ISSN 0277-786X ; 9908
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-316360 (URN)10.1117/12.2231653 (DOI)000391509100058 ()978-1-5106-0196-3 (ISBN)
Conference
Conference on Ground-Based and Airborne Instrumentation for Astronomy VI, JUN 26-30, 2016, Edinburgh, SCOTLAND
Available from: 2017-03-06 Created: 2017-03-06 Last updated: 2017-03-06Bibliographically approved
Thompson, S. J., Queloz, D., Baraffe, I., Brake, M., Dolgopolov, A., Fisher, M., . . . Young, J. (2016). HARS3 for a Roboticized Isaac Newton Telescope. In: GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VI: . Paper presented at Conference on Ground-Based and Airborne Instrumentation for Astronomy VI, JUN 26-30, 2016, Edinburgh, SCOTLAND. , 9908, Article ID UNSP 99086F.
Open this publication in new window or tab >>HARS3 for a Roboticized Isaac Newton Telescope
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2016 (English)In: GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VI, 2016, Vol. 9908, article id UNSP 99086FConference paper, Published paper (Refereed)
Abstract [en]

We present a description of a new instrument development, HARPS3, planned to be installed on an upgraded and roboticized Isaac Newton Telescope by end-2018. HARPS3 will be a high resolution (R similar or equal to 115,000) echelle spectrograph with a wavelength range from 380-690 nm. It is being built as part of the Terra Hunting Experiment {a future 10 year radial velocity measurement programme to discover Earth-like exoplanets. The instrument design is based on the successful HARPS spectrograph on the 3.6m ESO telescope and HARPS-N on the TNG telescope. The main changes to the design in HARPS3 will be: a customised fibre adapter at the Cassegrain focus providing a stabilised beam feed and on-sky fibre diameter approximate to 1.4 arcsec, the implementation of a new continuous flow cryostat to keep the CCD temperature very stable, detailed characterisation of the HARPS3 CCD to map the effective pixel positions and thus provide an improved accuracy wavelength solution, an optimised integrated polarimeter and the instrument integrated into a robotic operation. The robotic operation will optimise our programme which requires our target stars to be measured on a nightly basis. We present an overview of the entire project, including a description of our anticipated robotic operation.

Series
Proceedings of SPIE, ISSN 0277-786X ; 9908
Keywords
High resolution spectroscopy, robotic operations, RV measurements, exoplanets
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-316361 (URN)10.1117/12.2232111 (DOI)000391509100184 ()978-1-5106-0196-3 (ISBN)
Conference
Conference on Ground-Based and Airborne Instrumentation for Astronomy VI, JUN 26-30, 2016, Edinburgh, SCOTLAND
Available from: 2017-03-02 Created: 2017-03-02 Last updated: 2017-03-02Bibliographically approved
Dorn, R. J., Follert, R., Bristow, P., Cumani, C., Eschbaumer, S., Grunhut, J., . . . Tordo, S. (2016). The " plus " for CRIRES: enabling better science at infrared wavelength and high spectral resolution at the ESO VLT. In: Christopher J Evans (Ed.), GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VI: . Paper presented at Conference on Ground-Based and Airborne Instrumentation for Astronomy VI, JUN 26-30, 2016, Edinburgh, SCOTLAND. , 9908, Article ID 99080I.
Open this publication in new window or tab >>The " plus " for CRIRES: enabling better science at infrared wavelength and high spectral resolution at the ESO VLT
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2016 (English)In: GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY VI / [ed] Christopher J Evans, 2016, Vol. 9908, article id 99080IConference paper, Published paper (Refereed)
Abstract [en]

The adaptive optics (AO) assisted CRIRES instrument was a IR (0.92 - 5.2 mu m) high-resolution spectrograph in operation from 2006 to 2014 at the Very Large Telescope (VLT) observatory. CRIRES was a unique instrument, accessing a parameter space (wavelength range and spectral resolution) up to now largely uncharted. It consisted of a single-order spectrograph providing long-slit (40 arcsecond) spectroscopy with a resolving power up to R=100 000. However the setup was limited to a narrow, single-shot, spectral range of about 1/70 of the central wavelength, resulting in low observing efficiency for many scientific programmes requiring a broad spectral coverage. The CRIRES upgrade project, CRIRES, transfouns this VLT instrument into a cross-dispersed spectrograph to increase the simultaneously covered wavelength range by a factor of ten. A new and larger detector focal plane array of three Hawaii 2RG detectors with 5.3 mu m cut-off wavelength will replace the existing detectors. For advanced wavelength calibration, custom-made absorption gas cells and an etalon system will be added. A spectro-polarimetric unit will allow the recording of circular and linear polarized spectra. This upgrade will be supported by dedicated data reduction software allowing the community to take full advantage of the new capabilities. CRIRES has now entered its assembly and integration phase and will return with all new capabilities by the beginning of 2018 to the Very Large Telescope in Chile. This article will provide the reader with an update of the current status of the instrument as well as the remaining steps until final installation at the Paranal Observatory.

Series
Proceedings of SPIE, ISSN 0277-786X ; 9908
Keywords
astronomical instrumentation, infrared spectrographs, high spectral resolution, upgrade of existing VLT instruments, infrared spectrometers, wavelength calibration, radial-velocities, extra-solar planets
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-316359 (URN)10.1117/12.2232837 (DOI)000391509100013 ()978-1-5106-0196-3 (ISBN)
Conference
Conference on Ground-Based and Airborne Instrumentation for Astronomy VI, JUN 26-30, 2016, Edinburgh, SCOTLAND
Available from: 2017-03-06 Created: 2017-03-06 Last updated: 2017-03-06Bibliographically approved
Dubernet, M. L., Antony, B. K., Ba, Y. A., Babikov, Y. L., Bartschat, K., Boudon, V., . . . Zwoelf, C. M. (2016). The virtual atomic and molecular data centre (VAMDC) consortium. Journal of Physics B: Atomic, Molecular and Optical Physics, 49(7), Article ID 074003.
Open this publication in new window or tab >>The virtual atomic and molecular data centre (VAMDC) consortium
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2016 (English)In: Journal of Physics B: Atomic, Molecular and Optical Physics, ISSN 0953-4075, E-ISSN 1361-6455, Vol. 49, no 7, article id 074003Article in journal (Refereed) Published
Abstract [en]

The Virtual Atomic and Molecular Data Centre (VAMDC) Consortium is a worldwide consortium which federates atomic and molecular databases through an e-science infrastructure and an organisation to support this activity. About 90% of the inter-connected databases handle data that are used for the interpretation of astronomical spectra and for modelling in many fields of astrophysics. Recently the VAMDC Consortium has connected databases from the radiation damage and the plasma communities, as well as promoting the publication of data from Indian institutes. This paper describes how the VAMDC Consortium is organised for the optimal distribution of atomic and molecular data for scientific research. It is noted that the VAMDC Consortium strongly advocates that authors of research papers using data cite the original experimental and theoretical papers as well as the relevant databases.

Keywords
databases, atoms, molecules, spectroscopy, kinetic data, astrophysics
National Category
Atom and Molecular Physics and Optics
Identifiers
urn:nbn:se:uu:diva-292996 (URN)10.1088/0953-4075/49/7/074003 (DOI)000372911000003 ()
Available from: 2016-05-18 Created: 2016-05-11 Last updated: 2017-11-30Bibliographically approved
Ryabchikova, T., Piskunov, N., Kurucz, R. L., Stempels, E. H. C., Heiter, U., Pakhomov, Y. & Barklem, P. S. (2015). A major upgrade of the VALD database. Physica Scripta, 90(5), Article ID 054005.
Open this publication in new window or tab >>A major upgrade of the VALD database
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2015 (English)In: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896, Vol. 90, no 5, article id 054005Article in journal (Refereed) Published
Abstract [en]

Vienna atomic line database (VALD) is a collection of critically evaluated laboratory parameters for individual atomic transitions, complemented by theoretical calculations. VALD is actively used by astronomers for stellar spectroscopic studies-model atmosphere calculations, atmospheric parameter determinations, abundance analysis etc. The two first VALD releases contained parameters for atomic transitions only. In a major upgrade of VALD-VALD3, publically available from spring 2014, atomic data was complemented with parameters of molecular lines. The diatomic molecules C-2, CH, CN, CO, OH, MgH, SiH, TiO are now included. For each transition VALD provides species name, wavelength, energy, quantum number J and Lande-factor of the lower and upper levels, radiative, Stark and van der Waals damping factors and a full description of electronic configurarion and term information of both levels. Compared to the previous versions we have revised and verify all of the existing data and added new measurements and calculations for transitions in the range between 20 angstrom and 200 microns. All transitions were complemented with term designations in a consistent way and electron configurations when available. All data were checked for consistency: listed wavelength versus Ritz, selection rules etc. A new bibliographic system keeps track of literature references for each parameter in a given transition throughout the merging process so that every selected data entry can be traced to the original source. The query language and the extraction tools can now handle various units, vacuum and air wavelengths. In the upgrade process we had an intensive interaction with data producers, which was very helpful for improving the quality of the VALD content.

Keywords
data bases, atomic and molecular data, astrophysics
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-259165 (URN)10.1088/0031-8949/90/5/054005 (DOI)000356498700006 ()
Available from: 2015-07-29 Created: 2015-07-29 Last updated: 2017-12-04Bibliographically approved
Feiden, G. A., Stempels, E., Hebb, L., Mack, C. E. & Chaboyer, B. (2015). Spectroscopic Study of the Low Mass Benchmark Eclipsing Binary UV Piscium. In: Living Together: Planets, Host Stars, and Binaries. Paper presented at Conference on Living Together: Planets, Host Stars and Binaries, sep 08-12, 2014, Litomysl, Czech Republic (pp. 174-174). , 496
Open this publication in new window or tab >>Spectroscopic Study of the Low Mass Benchmark Eclipsing Binary UV Piscium
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2015 (English)In: Living Together: Planets, Host Stars, and Binaries, 2015, Vol. 496, p. 174-174Conference paper, Published paper (Refereed)
Series
Astronomical Society of the Pacific Conference Series ; 496
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-282747 (URN)000369467900025 ()978-1-58381-876-3 (ISBN)978-1-58381-877-0 (ISBN)
Conference
Conference on Living Together: Planets, Host Stars and Binaries, sep 08-12, 2014, Litomysl, Czech Republic
Available from: 2016-04-15 Created: 2016-04-06 Last updated: 2016-04-15Bibliographically approved
Oliva, E., Tozzi, A., Ferruzzi, D., Origlia, L., Hatzes, A., Follert, R., . . . Valenti, E. (2014). Concept and optical design of the cross-disperser module for CRIRES+. In: GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY V: . Paper presented at 5th Conference on Ground-Based and Airborne Instrumentation for Astronomy, JUN 22-26, 2014, Montreal, CANADA. , 9147, Article ID 91477R.
Open this publication in new window or tab >>Concept and optical design of the cross-disperser module for CRIRES+
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2014 (English)In: GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY V, 2014, Vol. 9147, article id 91477RConference paper, Published paper (Refereed)
Abstract [en]

CRIRES, the ESO high resolution infrared spectrometer, is a unique instrument which allows astronomers to access a parameter space which up to now was largely uncharted. In its current setup, it consists of a single-order spectrograph providing long-slit, single-order spectroscopy with resolving power up to R=100,000 over a quite narrow spectral range. This has resulted in sub-optimal efficiency and use of telescope time for all the scientific programs requiring broad spectral coverage of compact objects (e.g. chemical abundances of stars and intergalactic medium, search and characterization of extra-solar planets). To overcome these limitations, a consortium was set-up for upgrading CRIRES to a cross-dispersed spectrometer, called CRIRES+. This paper presents the updated optical design of the cross-dispersion module for CRIRES+. This new module can be mounted in place of the current pre-disperser unit. The new system yields a factor of >10 increase in simultaneous spectral coverage and maintains a quite long slit (10"), ideal for observations of extended sources and for precise sky-background subtraction.

Series
Proceedings of SPIE, ISSN 0277-786X
Keywords
Ground based infrared instruments, infrared spectrometers, high resolution spectroscopy
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-257491 (URN)10.1117/12.2054381 (DOI)000354527800233 ()978-0-8194-9615-7 (ISBN)
Conference
5th Conference on Ground-Based and Airborne Instrumentation for Astronomy, JUN 22-26, 2014, Montreal, CANADA
Available from: 2015-07-03 Created: 2015-07-02 Last updated: 2015-07-03Bibliographically approved
Follert, R., Dorn, R. J., Oliva, E., Lizon, J. L., Hatzes, A., Piskunov, N., . . . Smoker, J. (2014). CRIRES plus: a cross-dispersed high-resolution infrared spectrograph for the ESO VLT. In: GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY V: . Paper presented at 5th Conference on Ground-Based and Airborne Instrumentation for Astronomy, JUN 22-26, 2014, Montreal, CANADA. , 9147, Article ID 914719.
Open this publication in new window or tab >>CRIRES plus: a cross-dispersed high-resolution infrared spectrograph for the ESO VLT
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2014 (English)In: GROUND-BASED AND AIRBORNE INSTRUMENTATION FOR ASTRONOMY V, 2014, Vol. 9147, article id 914719Conference paper, Published paper (Refereed)
Abstract [en]

High-resolution infrared spectroscopy plays an important role in astrophysics from the search for exoplanets to cosmology. Yet, many existing infrared spectrographs are limited by a rather small simultaneous wavelength coverage. The AO assisted CRIRES instrument, installed at the ESO VLT on Paranal, is one of the few IR (0.92-5.2 mu m) high-resolution spectrographs in operation since 2006. However it has a limitation that hampers its efficient use: the wavelength range covered in a single exposure is limited to similar to 15 nanometers. The CRIRES Upgrade project (CRIRES+) will transform CRIRES into a cross-dispersed spectrograph and will also add new capabilities. By introducing cross-dispersion elements the simultaneously covered wavelength range will be increased by at least a factor of 10 with respect to the present configuration, while the operational wavelength range will be preserved. For advanced wavelength calibration, new custom made absorption gas cells and etalons will be added. A spectro-polarimetric unit will allow one for the first time to record circularly polarized spectra at the highest spectral resolution. This will be all supported by a new data reduction software which will allow the community to take full advantage of the new capabilities of CRIRES+.

Series
Proceedings of SPIE, ISSN 0277-786X
Keywords
Upgrade of existing instrument, high spectral resolution spectrograph, infrared spectrograph
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
urn:nbn:se:uu:diva-257488 (URN)10.1117/12.2054197 (DOI)000354527800041 ()978-0-8194-9615-7 (ISBN)
Conference
5th Conference on Ground-Based and Airborne Instrumentation for Astronomy, JUN 22-26, 2014, Montreal, CANADA
Available from: 2015-08-17 Created: 2015-07-02 Last updated: 2015-08-17Bibliographically approved
Telting, J. H., Avila, G., Buchhave, L., Frandsen, S., Gandolfi, D., Lindberg, B., . . . Prins, S. (2014). FIES: The high-resolution Fiber-fed Echelle Spectrograph at the Nordic Optical Telescope. Astronomical Notes - Astronomische Nachrichten, 335(1), 41-45
Open this publication in new window or tab >>FIES: The high-resolution Fiber-fed Echelle Spectrograph at the Nordic Optical Telescope
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2014 (English)In: Astronomical Notes - Astronomische Nachrichten, ISSN 0004-6337, E-ISSN 1521-3994, Vol. 335, no 1, p. 41-45Article in journal (Refereed) Published
Abstract [en]

FIES is a cross-dispersed high-resolution echelle spectrograph at the 2.56 m Nordic Optical Telescope (NOT), and was optimised for throughput and stability in 2006. The major 2006 upgrade involved the relocation of FIES to a stable environment and development of a fiber bundle that offers 3 different resolution modes, and made FIES an attractive tool for the user community of the NOT. Radial-velocity stability is achieved through double-chamber active temperature control. A dedicated data reduction tool, FIEStool, was developed. As a result of these upgrades, FIES is now one of the work-horse instruments at the NOT. ((c) 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Keywords
instrumentation: spectrographs, techniques: radial velocities, techniques: spectroscopic
National Category
Physical Sciences
Identifiers
urn:nbn:se:uu:diva-220819 (URN)10.1002/asna.201312007 (DOI)000330636200006 ()
Available from: 2014-03-20 Created: 2014-03-20 Last updated: 2017-12-05Bibliographically approved
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