Dr. Andras Gaspar Profile

Dr. Andras Gaspar

at Univ of Arizona

SPIE Involvement:

Author

Publications (3)

Proceedings Article | 27 August 2022 Presentation + Paper

Row and column artifacts in JWST MIRI’s Si:As blocked impurity band detectors

Daniel Dicken, George Rieke, Michael Ressler, Jane Morrison, Macarena Garcia Marin, Iaonnis Argyriou, Karl Gordon, Mike Regan, Christophe Cossou, Andras Gaspar, Alistair Glasse, Pierre Guillard, Alvaro Labiano, Gillian Wright

Proceedings Volume 12180, 121802R (2022) https://doi.org/10.1117/12.2630027

KEYWORDS: James Webb Space Telescope, Imaging systems, Detector arrays

Read Abstract +

Proceedings Article | 15 December 2020 Presentation + Paper

Characterization of the optical properties of the buried contact of the JWST MIRI Si: as infrared blocked impurity band detectors

Ioannis Argyriou, George Rieke, Michael Ressler, András Gáspár, Bart Vandenbussche

Proceedings Volume 11454, 114541P (2020) https://doi.org/10.1117/12.2561502

KEYWORDS: Sensors, Modulation, Infrared cameras, Infrared radiation, Imaging spectroscopy, Quantum efficiency, Infrared imaging, Infrared spectroscopy, Absorption, Signal detection

Read Abstract +

Proceedings Article | 24 July 2018 Presentation + Paper

The HOSTS survey for exo-zodiacal dust: preliminary results and future prospects

S. Ertel, G. Kennedy, D. Defrère, P. Hinz, A. Shannon, B. Mennesson, W. C. Danchi, C. Gelino, J. M. Hill, W. Hoffman, G. Rieke, E. Spalding, J. Stone, A. Vaz, A. Weinberger, P. Willems, O. Absil, P. Arbo, V. Bailey, C. Beichman, G. Bryden, E. Downey, O. Durney, S. Esposito, A. Gaspar, P. Grenz, C. Haniff, J. Leisenring, L. Marion, T. McMahon, R. Millan-Gabet, M. Montoya, K. Morzinski, E. Pinna, J. Power, A. Puglisi, A. Roberge, E. Serabyn, A. Skemer, K. Stapelfeldt, K. Y. L. Su, V. Vaitheeswaran, M. Wyatt

Proceedings Volume 10698, 106981V (2018) https://doi.org/10.1117/12.2313685

KEYWORDS: Stars, Planets, Calibration, Statistical analysis, Exoplanets, Space telescopes, Nulling interferometry, Astronomy, Telescopes, Interferometry

Read Abstract +

The presence of large amounts of dust in the habitable zones of nearby stars is a significant obstacle for future exo-Earth imaging missions. We executed the HOSTS (Hunt for Observable Signatures of Terrestrial Systems) survey to determine the typical amount of such exozodiacal dust around a sample of nearby main sequence stars. The majority of the data have been analyzed and we present here an update of our ongoing work. Nulling interferometry in N band was used to suppress the bright stellar light and to detect faint, extended circumstellar dust emission. We present an overview of the latest results from our ongoing work. We find seven new N band excesses in addition to the high confidence confirmation of three that were previously known. We find the first detections around Sun-like stars and around stars without previously known circumstellar dust. Our overall detection rate is 23%. The inferred occurrence rate is comparable for early type and Sun-like stars, but decreases from 71^{+11 -20}% for stars with previously detected mid- to far-infrared excess to 11^{+9 -4}% for stars without such excess, confirming earlier results at high confidence. For completed observations on individual stars, our sensitivity is five to ten times better than previous results. Assuming a lognormal luminosity function of the dust, we find upper limits on the median dust level around all stars without previously known mid to far infrared excess of 11.5 zodis at 95% confidence level. The corresponding upper limit for Sun-like stars is 16 zodis. An LBTI vetted target list of Sun-like stars for exo-Earth imaging would have a corresponding limit of 7.5 zodis. We provide important new insights into the occurrence rate and typical levels of habitable zone dust around main sequence stars. Exploiting the full range of capabilities of the LBTI provides a critical opportunity for the detailed characterization of a sample of exozodiacal dust disks to understand the origin, distribution, and properties of the dust.

View contact details

UPDATE YOUR PROFILE

Is this your profile? Update it now.

Sign into your SPIE.org account

Don’t have a profile and want one?

Create an account on SPIE.org

Keywords/Phrases

Search In:

Publication Years