Dr. Bengt Larsson Profile

Dr. Bengt Larsson

at Stockholm Univ

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Publications (3)

Proceedings Article | 23 December 2020 Poster

The SAFARI grating spectrometer for SPICA: Extreme spectroscopic sensitivity in the FAR-IR

Peter Roelfsema, Pieter Dieleman, Willem Jellema, Gert de Lange, Jaap Evers, Shoko Jin, Martin Giard, Francisco Najarro, Charles Bradford, Marc Audard, Stafford Withington, Yasuo Doi, Frank Helmich, Mika Juvela, Franz Kerschbaum, Csaba Kiss, Oliver Krause, Bengt Larsson, David Naylor, Luigi Spinoglio, Ryszard Szczerba, Floris van der Tak, Bart Vandenbussche, Shiang-Yu Wang

Proceedings Volume 11443, 114436W (2020) https://doi.org/10.1117/12.2563140

KEYWORDS: Spectroscopes, Spectroscopy, Sensors, Beam steering, Mirrors, Galactic astronomy, Observatories, Relays, Signal detection, Telescopes

Proceedings Article | 13 December 2020 Presentation

The joint infrared space observatory SPICA: unveiling the obscured universe

Peter Roelfsema, Hiroshi Shibai, Hidehiro Kaneda, Marc Sauvage, Martin Giard, Francisco Najarro, Charles Bradford, Toru Yamada, Jan Tauber, Marc Audard, Pieter Dieleman, Yasuo Doi, David Elbaz, Matt Griffin, Frank Helmich, Astrid Heske, Mitsuhiko Honda, Willem Jellema, Shoko Jin, Mika Juvela, Inga Kamp, Franz Kerschbaum, Csaba Kiss, Kotaro Kohno, Oliver Krause, Gert de Lange, Bengt Larsson, Jesus Martin-Pintado, Hideo Matsuhara, Takao Nakagawa, Tohru Nagao, David Naylor, Hideko Nomura, Hiroyuki Ogawa, Takashi Onaka, Jacques Rouquet, Luigi Spinoglio, Ryszard Szczerba, Floris van der Tak, Bart Vandenbussche, Shiang-Yu Wang, Stafford Withington

Proceedings Volume 11443, 1144325 (2020) https://doi.org/10.1117/12.2562946

KEYWORDS: Infrared Space Observatory, Sensors, Telescopes, Spectroscopes, Imaging systems, Liquids, Cryogenics, Observatories, Ions, Molecules

Read Abstract +

Proceedings Article | 10 July 2018 Presentation

SPICA: a joint infrared space observatory (Conference Presentation)

Peter Roelfsema, Hiroshi Shibai, Kees Wafelbakker, Gert de Lange, Martin Giard, Francisco Najarro, Marc Audard, Lee Armus, Charles Bradford, Yasuo Doi, Matt Griffin, Frank Helmich, Inga Kamp, Hidehiro Kaneda, Ciska Kemper, Franz Kerschbaum, Kotaro Kohno, Oliver Krause, Bengt Larsson, Sue Madden, Hideo Matsuhara, Takao Nakagawa, David Naylor, Hiroyuki Ogawa, Takashi Onaka, Luigi Spinoglio, Floris van der Tak, Bart Vandenbussche, Toru Yamada

Proceedings Volume 10698, 106980A (2018) https://doi.org/10.1117/12.2313124

KEYWORDS: Space telescopes, Telescopes, Infrared Space Observatory, Planetary systems, Infrared radiation, Infrared telescopes, Galaxy evolution, Sensors, Cryogenics, Spectroscopes

Read Abstract +

Measurements in the infrared wavelength domain allow us to assess directly the physical state and energy balance of cool matter in space, thus enabling the detailed study of the various processes that govern the formation and early evolution of stars and planetary systems in the Milky Way and of galaxies over cosmic time. Previous infrared missions, from IRAS to Herschel, have revealed a great deal about the obscured Universe, but sensitivity has been limited because up to now it has not been possible to fly a telescope that is both large and cold. Such a facility is essential to address key astrophysical questions, especially concerning galaxy evolution and the development of planetary systems. SPICA is a mission concept aimed at taking the next step in mid- and far-infrared observational capability by combining a large and cold telescope with instruments employing state-of-the-art ultra-sensitive detectors. The mission concept foresees a 2.5-meter diameter telescope cooled to below 8 K. Rather than using liquid cryogen, a combination of passive cooling and mechanical coolers will be used to cool both the telescope and the instruments. With cooling not dependent on a limited cryogen supply, the mission lifetime can extend significantly beyond the required three years. The combination of low telescope background and instruments with state-of-the-art detectors means that SPICA can provide a huge advance on the capabilities of previous missions. The SPICA instrument complement offers spectral resolving power ranging from ~50 through 11000 in the 17-230 µm domain as well as ~28.000 spectroscopy between 12 and 18 µm. Additionally, SPICA will be capable of efficient 30-37 µm broad band mapping, and small field spectroscopic and polarimetric imaging in the 100-350 µm range. SPICA will enable far infrared spectroscopy with an unprecedented sensitivity of ~5x10-20 W/m2 (5σ/1hr) - at least two orders of magnitude improvement over what has been attained to date. With this exceptional leap in performance, new domains in infrared astronomy will become accessible, allowing us, for example, to unravel definitively galaxy evolution and metal production over cosmic time, to study dust formation and evolution from very early epochs onwards, and to trace the formation history of planetary systems.

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