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Roger Förstner - One of the best experts on this subject based on the ideXlab platform.

  • Infrared Astronomy Satellite Swarm Interferometry (IRASSI): Overview and study results
    Advances in Space Research, 2020
    Co-Authors: Hendrik Linz, Divya Bhatia, Luisa Buinhas, Matthias Lezius, Eloi Ferrer, Roger Förstner, Kathrin Frankl, Mathias Philips-blum, Meiko Steen, Ulf Bestmann
    Abstract:

    Abstract The far-Infrared (FIR) regime is one of the few wavelength ranges where no astronomical data with sub-arcsecond spatial resolution exist yet. Neither of the medium-term Satellite projects like SPICA, Millimetron or OST will resolve this malady. For many research areas, however, information at high spatial and spectral resolution in the FIR, taken from atomic fine-structure lines, from highly excited carbon monoxide (CO) and especially from water lines would open the door for transformative science. These demands call for interferometric concepts. We present here first results of our feasibility study IRASSI (Infrared Astronomy Satellite Swarm Interferometry) for an FIR space interferometer. Extending on the principal concept of the previous study ESPRIT, it features heterodyne interferometry within a swarm of five Satellite elements. The Satellites can drift in and out within a range of several hundred meters, thereby achieving spatial resolutions of

  • IRASSI: Infrared Astronomy Satellite swarm interferometry — Mission concept and description
    2016 IEEE Aerospace Conference, 2016
    Co-Authors: Luisa Buinhas, Eloi Ferrer-gil, Roger Förstner
    Abstract:

    A current focus of modern Astronomy is the characterization of the physical properties and of the chemical processes which can lead to prebiotic conditions in Earth-like planets. In order to identify such conditions, the first step is to observe regions in space which could originate Earth-like planets, such as stellar disks. The involved chemical processes are visible in the far-Infrared radiation spectrum - more specifically in the spectral range of 1 to 6 THz. In order to perform observations in the far-Infrared frequencies with high resolution, sophisticated instrumentation needs to be used. This spectrum is attenuated by the atmosphere and therefore can only be observed directly from space. Due to the high requirements placed on the spatial resolution, interferometry has gained popularity in recent years. Interferometric systems employ arrays of telescopes to extract information about a source with high resolution, by super-imposing electromagnetic wavefronts which are phase-shifted and measuring their interference. Such a system relies on the determination of the baseline of the telescopes with an accuracy proportional to the observed wavelength. In the far-Infrared, this corresponds to accuracies in the micrometer level. This paper presents the IRASSI mission, whose aim is the observation of stellar disks and protoplanetary regions so as to understand the genesis of planets, star formation and evolution processes. IRASSI is a multidisciplinary interferometric telescope mission to the second Lagrange point, L2, of the Sun-Earth/Moon system. The constellation is composed of 5 spacecraft. The operating principle of IRASSI is that by dynamically changing the baseline distances between the spacecraft during scientific observations, one can measure the interference of the wavefronts at different locations. This technique allows the observation of the far-Infrared phenomena at better resolution than that obtained with a single spacecraft. The outline of the IRASSI mission was built on precursor mission studies and concepts, such as ESPRIT and DARWIN. Unlike DARWIN, for instance, IRASSI does not require active control of the formation because it uses heterodyne detection in combination with a ranging system, which can provide inter-Satellite distances with a very high accuracy. The present paper introduces therefore the mission concept of IRASSI, followed by a detailed description of the in-orbit operational concept at L2, while addressing how such mission fills in the gap of information regarding the observations in the far-Infrared. The main mission analysis results obtained thus far are subsequently presented, and a hypothesized mechanical configuration is described. The key technical challenges posed by such endeavor are identified, complemented by an overview of the future work. The concluding remarks of the IRASSI study are then provided.

  • irassi Infrared Astronomy Satellite swarm interferometry mission concept and description
    IEEE Aerospace Conference, 2016
    Co-Authors: Luisa Buinhas, Eloi Ferrergil, Roger Förstner
    Abstract:

    A current focus of modern Astronomy is the characterization of the physical properties and of the chemical processes which can lead to prebiotic conditions in Earth-like planets. In order to identify such conditions, the first step is to observe regions in space which could originate Earth-like planets, such as stellar disks. The involved chemical processes are visible in the far-Infrared radiation spectrum — more specifically in the spectral range of 1 to 6 THz. In order to perform observations in the far-Infrared frequencies with high resolution, sophisticated instrumentation needs to be used. This spectrum is attenuated by the atmosphere and therefore can only be observed directly from space. Due to the high requirements placed on the spatial resolution, interferometry has gained popularity in recent years. Interferometric systems employ arrays of telescopes to extract information about a source with high resolution, by super-imposing electromagnetic wavefronts which are phase-shifted and measuring their interference. Such a system relies on the determination of the baseline of the telescopes with an accuracy proportional to the observed wavelength. In the far-Infrared, this corresponds to accuracies in the micrometer level. This paper presents the IRASSI mission, whose aim is the observation of stellar disks and protoplanetary regions so as to understand the genesis of planets, star formation and evolution processes. IRASSI is a multidisciplinary interferometric telescope mission to the second Lagrange point, L2, of the Sun-Earth/Moon system. The constellation is composed of 5 spacecraft. The operating principle of IRASSI is that by dynamically changing the baseline distances between the spacecraft during scientific observations, one can measure the interference of the wavefronts at different locations. This technique allows the observation of the far-Infrared phenomena at better resolution than that obtained with a single spacecraft. The outline of the IRASSI mission was built on precursor mission studies and concepts, such as ESPRIT and DARWIN. Unlike DARWIN, for instance, IRASSI does not require active control of the formation because it uses heterodyne detection in combination with a ranging system, which can provide inter-Satellite distances with a very high accuracy. The present paper introduces therefore the mission concept of IRASSI, followed by a detailed description of the in-orbit operational concept at L2, while addressing how such mission fills in the gap of information regarding the observations in the far-Infrared. The main mission analysis results obtained thus far are subsequently presented, and a hypothesized mechanical configuration is described. The key technical challenges posed by such endeavor are identified, complemented by an overview of the future work. The concluding remarks of the IRASSI study are then provided.

Luisa Buinhas - One of the best experts on this subject based on the ideXlab platform.

  • Infrared Astronomy Satellite Swarm Interferometry (IRASSI): Overview and study results
    Advances in Space Research, 2020
    Co-Authors: Hendrik Linz, Divya Bhatia, Luisa Buinhas, Matthias Lezius, Eloi Ferrer, Roger Förstner, Kathrin Frankl, Mathias Philips-blum, Meiko Steen, Ulf Bestmann
    Abstract:

    Abstract The far-Infrared (FIR) regime is one of the few wavelength ranges where no astronomical data with sub-arcsecond spatial resolution exist yet. Neither of the medium-term Satellite projects like SPICA, Millimetron or OST will resolve this malady. For many research areas, however, information at high spatial and spectral resolution in the FIR, taken from atomic fine-structure lines, from highly excited carbon monoxide (CO) and especially from water lines would open the door for transformative science. These demands call for interferometric concepts. We present here first results of our feasibility study IRASSI (Infrared Astronomy Satellite Swarm Interferometry) for an FIR space interferometer. Extending on the principal concept of the previous study ESPRIT, it features heterodyne interferometry within a swarm of five Satellite elements. The Satellites can drift in and out within a range of several hundred meters, thereby achieving spatial resolutions of

  • IRASSI: Infrared Astronomy Satellite swarm interferometry — Mission concept and description
    2016 IEEE Aerospace Conference, 2016
    Co-Authors: Luisa Buinhas, Eloi Ferrer-gil, Roger Förstner
    Abstract:

    A current focus of modern Astronomy is the characterization of the physical properties and of the chemical processes which can lead to prebiotic conditions in Earth-like planets. In order to identify such conditions, the first step is to observe regions in space which could originate Earth-like planets, such as stellar disks. The involved chemical processes are visible in the far-Infrared radiation spectrum - more specifically in the spectral range of 1 to 6 THz. In order to perform observations in the far-Infrared frequencies with high resolution, sophisticated instrumentation needs to be used. This spectrum is attenuated by the atmosphere and therefore can only be observed directly from space. Due to the high requirements placed on the spatial resolution, interferometry has gained popularity in recent years. Interferometric systems employ arrays of telescopes to extract information about a source with high resolution, by super-imposing electromagnetic wavefronts which are phase-shifted and measuring their interference. Such a system relies on the determination of the baseline of the telescopes with an accuracy proportional to the observed wavelength. In the far-Infrared, this corresponds to accuracies in the micrometer level. This paper presents the IRASSI mission, whose aim is the observation of stellar disks and protoplanetary regions so as to understand the genesis of planets, star formation and evolution processes. IRASSI is a multidisciplinary interferometric telescope mission to the second Lagrange point, L2, of the Sun-Earth/Moon system. The constellation is composed of 5 spacecraft. The operating principle of IRASSI is that by dynamically changing the baseline distances between the spacecraft during scientific observations, one can measure the interference of the wavefronts at different locations. This technique allows the observation of the far-Infrared phenomena at better resolution than that obtained with a single spacecraft. The outline of the IRASSI mission was built on precursor mission studies and concepts, such as ESPRIT and DARWIN. Unlike DARWIN, for instance, IRASSI does not require active control of the formation because it uses heterodyne detection in combination with a ranging system, which can provide inter-Satellite distances with a very high accuracy. The present paper introduces therefore the mission concept of IRASSI, followed by a detailed description of the in-orbit operational concept at L2, while addressing how such mission fills in the gap of information regarding the observations in the far-Infrared. The main mission analysis results obtained thus far are subsequently presented, and a hypothesized mechanical configuration is described. The key technical challenges posed by such endeavor are identified, complemented by an overview of the future work. The concluding remarks of the IRASSI study are then provided.

  • irassi Infrared Astronomy Satellite swarm interferometry mission concept and description
    IEEE Aerospace Conference, 2016
    Co-Authors: Luisa Buinhas, Eloi Ferrergil, Roger Förstner
    Abstract:

    A current focus of modern Astronomy is the characterization of the physical properties and of the chemical processes which can lead to prebiotic conditions in Earth-like planets. In order to identify such conditions, the first step is to observe regions in space which could originate Earth-like planets, such as stellar disks. The involved chemical processes are visible in the far-Infrared radiation spectrum — more specifically in the spectral range of 1 to 6 THz. In order to perform observations in the far-Infrared frequencies with high resolution, sophisticated instrumentation needs to be used. This spectrum is attenuated by the atmosphere and therefore can only be observed directly from space. Due to the high requirements placed on the spatial resolution, interferometry has gained popularity in recent years. Interferometric systems employ arrays of telescopes to extract information about a source with high resolution, by super-imposing electromagnetic wavefronts which are phase-shifted and measuring their interference. Such a system relies on the determination of the baseline of the telescopes with an accuracy proportional to the observed wavelength. In the far-Infrared, this corresponds to accuracies in the micrometer level. This paper presents the IRASSI mission, whose aim is the observation of stellar disks and protoplanetary regions so as to understand the genesis of planets, star formation and evolution processes. IRASSI is a multidisciplinary interferometric telescope mission to the second Lagrange point, L2, of the Sun-Earth/Moon system. The constellation is composed of 5 spacecraft. The operating principle of IRASSI is that by dynamically changing the baseline distances between the spacecraft during scientific observations, one can measure the interference of the wavefronts at different locations. This technique allows the observation of the far-Infrared phenomena at better resolution than that obtained with a single spacecraft. The outline of the IRASSI mission was built on precursor mission studies and concepts, such as ESPRIT and DARWIN. Unlike DARWIN, for instance, IRASSI does not require active control of the formation because it uses heterodyne detection in combination with a ranging system, which can provide inter-Satellite distances with a very high accuracy. The present paper introduces therefore the mission concept of IRASSI, followed by a detailed description of the in-orbit operational concept at L2, while addressing how such mission fills in the gap of information regarding the observations in the far-Infrared. The main mission analysis results obtained thus far are subsequently presented, and a hypothesized mechanical configuration is described. The key technical challenges posed by such endeavor are identified, complemented by an overview of the future work. The concluding remarks of the IRASSI study are then provided.

Bestmann Ulf - One of the best experts on this subject based on the ideXlab platform.

  • Infrared Astronomy Satellite Swarm Interferometry (IRASSI): Overview and Study Results
    'Elsevier BV', 2019
    Co-Authors: Linz Hendrik, Bhatia Divya, Buinhas Luisa, Lezius Matthias, Ferrer Eloi, Förstner Roger, Frankl Kathrin, Philips-blum Mathias, Steen Meiko, Bestmann Ulf
    Abstract:

    The far-Infrared (FIR) is one of the few wavelength ranges where no astronomical data with sub-arcsec resolution exist yet. Neither of the medium-term Satellite projects like SPICA, Millimetron or OST will resolve this malady. Information at high spatial and spectral resolution in the FIR, taken from atomic fine-structure lines, highly excited CO, and especially from water lines would, however, open the door for transformative science. This calls for interferometric concepts. We present first results of our feasibility study IRASSI (Infrared Astronomy Satellite Swarm Interferometry) for a FIR space interferometer. Extending on the principal concept of the ESPRIT study, it features heterodyne interferometry within a swarm of 5 Satellite elements. The Satellites can drift in and out within a range of several hundred meters, thereby achieving spatial resolutions of

Ulf Bestmann - One of the best experts on this subject based on the ideXlab platform.

  • Infrared Astronomy Satellite Swarm Interferometry (IRASSI): Overview and study results
    Advances in Space Research, 2020
    Co-Authors: Hendrik Linz, Divya Bhatia, Luisa Buinhas, Matthias Lezius, Eloi Ferrer, Roger Förstner, Kathrin Frankl, Mathias Philips-blum, Meiko Steen, Ulf Bestmann
    Abstract:

    Abstract The far-Infrared (FIR) regime is one of the few wavelength ranges where no astronomical data with sub-arcsecond spatial resolution exist yet. Neither of the medium-term Satellite projects like SPICA, Millimetron or OST will resolve this malady. For many research areas, however, information at high spatial and spectral resolution in the FIR, taken from atomic fine-structure lines, from highly excited carbon monoxide (CO) and especially from water lines would open the door for transformative science. These demands call for interferometric concepts. We present here first results of our feasibility study IRASSI (Infrared Astronomy Satellite Swarm Interferometry) for an FIR space interferometer. Extending on the principal concept of the previous study ESPRIT, it features heterodyne interferometry within a swarm of five Satellite elements. The Satellites can drift in and out within a range of several hundred meters, thereby achieving spatial resolutions of

David L. Block - One of the best experts on this subject based on the ideXlab platform.

  • A family of cometary globules around an Infrared source near the Rosette nebula
    Nature, 1990
    Co-Authors: David L. Block
    Abstract:

    SEEN in silhouette against the numerous ionized H II regions in the Milky Way are groups of small dark clouds of neutral gas and dust known as Bok globules. In some cases the stellar wind from a nearby star strips material from the globules, creating a tail pointing away from the source of the wind. Here I report the use of a photographic enhancement technique to reveal a family of four such 'cometary' globules in the southeast quadrant of the Rosette nebula, NGC2237 – 2246. The globules are not visible on R-glass copies of the National Geographic/ Palomar Observatory Sky Survey. The tails of the globules all point away from the IRAS (Infrared Astronomy Satellite) source 06314 + 0427, the position of which coincides with the peak of CO emission^1. The far-Infrared luminosity of 06314 + 0427 is estimated to be a factor of at least 880 greater than the Sun's luminosity, with a total energy output enough to drive a stellar wind that could produce the observed globules.