Dr. Lindsay Marion Profile

Dr. Lindsay Marion

at Liège Univ

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Publications (3)

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

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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.

Proceedings Article | 4 August 2016 Paper

Making high-accuracy null depth measurements for the LBTI exozodi survey

Bertrand Mennesson, Denis Defrère, Matthias Nowak, Philip Hinz, Rafael Millan-Gabet, Olivier Absil, Vanessa Bailey, Geoffrey Bryden, William Danchi, Grant Kennedy, Lindsay Marion, Aki Roberge, Eugene Serabyn, Andy Skemer, Karl Stapelfeldt, Alycia Weinberger, Mark Wyatt

Proceedings Volume 9907, 99070X (2016) https://doi.org/10.1117/12.2231839

KEYWORDS: Interferometry, Mid-IR, Stars, Calibration, Visibility, Telescopes, Sensors, Astronomy, Signal detection, Error analysis

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Proceedings Article | 24 July 2014 Paper

Unveiling new stellar companions from the PIONIER exozodi survey

L. Marion, O. Absil, S. Ertel, J.-B. Le Bouquin, D. Defrère

Proceedings Volume 9146, 91461K (2014) https://doi.org/10.1117/12.2057823

KEYWORDS: Visibility, Stars, Data modeling, Infrared radiation, Interferometry, Binary data, Target detection, Infrared signatures, Lithium, Telescopes

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