Dr. Jens Kammerer Profile

Dr. Jens Kammerer

Research Fellow at European Southern Observatory

SPIE Involvement:

Conference Chair | Author

Area of Expertise:

Exoplanets , Brown dwarfs , High-contrast imaging , Optical/IR interferometry , Planet formation , Planet atmospheres

Proceedings Article | 27 August 2022 Presentation + Paper

Direct imaging and spectroscopy of exoplanetary systems with the JWST early release science program

Sasha Hinkley, Aarynn Carter, Shrishmoy Ray, Beth Biller, Andrew Skemer, Elodie Choquet, Maxwell Millar-Blanchaer, Stephanie Sallum, Brittany Miles, Niall Whiteford, Polychronis Patapis, Marshall Perrin, Laurent Pueyo, Karl Stapelfeldt, Jason Wang, Kimberly Ward-Duong, Julien Girard, Dean Hines, Jens Kammerer, Jarron Leisenring, Yifan Zhou, Michael Meyer, Michael Liu, Mickael Bonnefoy, Simon Petrus, Mariangela Bonavita, Gael Chauvin, Christine Chen, Thayne Currie, Kielan K. Hoch, Cecilia Lazzoni, Elisabeth Matthews, Michael McElwain, Isabel Rebollido, Emily Rickman, Glenn Schneider, Anand Sivaramakrishnan, Jordan Stone

Proceedings Volume 12180, 121800S (2022) https://doi.org/10.1117/12.2629919

KEYWORDS: James Webb Space Telescope, Coronagraphy, Planets, Exoplanets, Imaging systems, Astronomy, Imaging spectroscopy, Spectroscopy, Stars, Calibration

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Proceedings Article | 27 August 2022 Poster + Presentation + Paper

JWST/NIRCam coronagraphy: commissioning and first on-sky results

Julien Girard, Jarron Leisenring, Jens Kammerer, Mario Gennaro, Marcia Rieke, John Stansberry, Armin Rest, Eiichi Egami, Ben Sunnquist, Martha Boyer, Alicia Canipe, Matteo Correnti, Bryan Hilbert, Marshall Perrin, Laurent Pueyo, Remi Soummer, Marsha Allen, Howard Bushouse, Jonathan Aguilar, Brian Brooks, Dan Coe, Audrey DiFelice, David Golimowski, George Hartig, Dean Hines, Anton Koekemoer, Bryony Nickson, Nikolay Nikolov, Vera Kozhurina-Platais, Nor Pirzkal, Massimo Robberto, Anand Sivaramakrishnan, Sangmo Tony Sohn, Randal Telfer, Chi Rai Wu, Thomas Beatty, Michael Florian, Kevin Hainline, Doug Kelly, Karl Misselt, Everett Schlawin, Fengwu Sun, Christina Williams, Christopher Willmer, Christopher Stark, Marie Ygouf, Aarynn Carter, Charles Beichman, Thomas Greene, Thomas Roellig, John Krist, Jéa Adams Redai, Jason Wang, Charles Clark, Dan Lewis, Malcolm Ferry

Proceedings Volume 12180, 121803Q (2022) https://doi.org/10.1117/12.2629636

KEYWORDS: Coronagraphy, Stars, James Webb Space Telescope, Point spread functions, Distortion, Telescopes, Signal to noise ratio, Calibration, Target acquisition, Exoplanets, Astronomical imaging, Near infrared, Direct methods, Astronomical instrumentation

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Proceedings Article | 27 August 2022 Paper

Performance of near-infrared high-contrast imaging methods with JWST from commissioning

Jens Kammerer, Julien Girard, Aarynn Carter, Marshall Perrin, Rachel Cooper, Deepashri Thatte, Thomas Vandal, Jarron Leisenring, Jason Wang, William Balmer, Anand Sivaramakrishnan, Laurent Pueyo, Kimberly Ward-Duong, Ben Sunnquist, Jéa Adams Redai

Proceedings Volume 12180, 121803N (2022) https://doi.org/10.1117/12.2628865

KEYWORDS: Coronagraphy, James Webb Space Telescope, Target acquisition, Data processing, Telescopes, Calibration, Interferometry, Image registration

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The James Webb Space Telescope (JWST) will revolutionize the field of high-contrast imaging and enable both the direct detection of Saturn-mass planets and the characterization of substellar companions in the mid-infrared. While JWST will feature unprecedented sensitivity, angular resolution will be the key factor when competing with ground-based telescopes. Here, we aim to characterize the performance of several extreme angular resolution imaging techniques available with JWST in the 3–5 µm regime based on data taken during the instrument commissioning. Firstly, we introduce custom tools to simulate, reduce, and analyze JWST NIRCam and MIRI coronagraphy data and use these tools to extract companion detection limits from on-sky NIRCam round and bar mask coronagraphy observations. Secondly, we present on-sky JWST NIRISS aperture masking interferometry (AMI) and kernel phase imaging (KPI) observations from which we extract companion detection limits using the publicly available fouriever tool. Scaled to a total integration time of one hour and a target of the brightness of AB Dor (W1 ≈ 4.4 mag, W2 ≈ 3.9 mag), we find that NIRISS AMI and KPI reach contrasts of ∼ 7–8 mag at ∼ 70 mas and ∼ 9 mag at ∼ 200 mas. Beyond ∼ 250 mas, NIRCam coronagraphy reaches deeper contrasts of ∼ 13 mag at ∼ 500 mas and ∼ 15 mag at ∼ 2 arcsec. While the bar mask performs ∼ 1 mag better than the round mask at small angular separations ≲ 0.75 arcsec, it is the other way around at large angular separations ≳ 1.5 arcsec. Moreover, the round mask gives access to the full 360 deg field-of-view which is beneficial for the search of new companions. We conclude that already during the instrument commissioning, JWST high-contrast imaging in the L- and M-bands performs close to its predicted limits and is a factor of ∼ 10 times better at large separations than the best ground-based instruments operating at similar wavelengths despite its < 2 times smaller collecting area.

Proceedings Article | 16 December 2020 Presentation + Paper

The ExoGRAVITY project: using single mode interferometry to characterize exoplanets

S. Lacour, J. Wang, M. Nowak, L. Pueyo, F. Eisenhauer, A.-M. Lagrange, P. Mollière, R. Abuter, A. Amorin, R. Asensio-Torres, M. Bauböck, M. Benisty, J. P. Berger, H. Beust, S. Blunt, A. Boccaletti, A. Bohn, M. Bonnefoy, H. Bonnet, W. Brandner, F. Cantalloube, P. Caselli, B. Charnay, G. Chauvin, E. Choquet, V. Christiaens, Y. Clénet, A. Cridland, P. T. de Zeeuw, R. Dembet, J. Dexter, A. Drescher, G. Duvert, F. Gao, P. Garcia, R. Garcia Lopez, T. Gardner, E. Gendron, R. Genzel, S. Gillessen, J. H. Girard, X. Haubois, G. Heißel, T. Henning, S. Hinkley, S. Hippler, M. Horrobin, M. Houllé, Z. Hubert, A. Jiménez-Rosales, L. Jocou, J. Kammerer, M. Keppler, P. Kervella, L. Kreidberg, V. Lapeyrère, J.-B. Le Bouquin, P. Léna, D. Lutz, A.-L. Maire, A. Mérand, J. D. Monnier, D. Mouillet, A. Muller, E. Nasedkin, T. Ott, G. P. P. L. Otten, C. Paladini, T. Paumard, K. Perraut, G. Perrin, O. Pfuhl, J. Rameau, L. Rodet, G. Rodriguez-Coira, G. Rousset, J. Shangguan, T. Shimizu, J. Stadler, O. Straub, C. Straubmeier, E. Sturm, T. Stolker, E. van Dishoeck, A. Vigan, F. Vincent, S. D. von Fellenberg, K. Ward-Duong, F. Widmann, E. Wieprecht, E. Wiezorrek, J. Woillez

Proceedings Volume 11446, 114460O (2020) https://doi.org/10.1117/12.2561667

KEYWORDS: Interferometry, Exoplanets

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Proceedings Article | 13 December 2020 Poster + Presentation + Paper

Performance study of interferometric small-sats to detect exoplanets: updated exoplanet yield and application to nearby exoplanets

Colin Dandumont, Jens Kammerer, Denis Defrère, Jérôme Loicq

Proceedings Volume 11446, 114462G (2020) https://doi.org/10.1117/12.2562119

KEYWORDS: Exoplanets, Interferometry, Satellites, Stars, Monte Carlo methods, Nulling interferometry, Mid-IR, Spatial resolution, Destructive interference, Phase shifts

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Proceedings Article | 13 December 2020 Paper

Review and scientific prospects of high-contrast optical stellar interferometry

D. Defrère, O. Absil, J.-P. Berger, W. C. Danchi, C. Dandumont, F. Eisenhauer, S. Ertel, T. Gardner, A. Glauser, P. Hinz, M. Ireland, J. Kammerer, S. Kraus, L. Labadie, S. Lacour, R. Laugier, J. Loicq, G. Martin, F. Martinache, M. A. Martinod, B. Mennesson, J. Monnier, B. Norris, M. Nowak, J. U. Pott, S. Quanz, E. Serabyn, J. Stone, P. Tuthill, J. Woillez

Proceedings Volume 11446, 114461J (2020) https://doi.org/10.1117/12.2561505

KEYWORDS: Stellar interferometry, Interferometry, Nulling interferometry, Data acquisition, Stars, Adaptive optics, Integrated optics, Calibration, Large telescopes

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SPIE Journal Paper | 23 September 2020

Exoplanet detection yield of a space-based Bracewell interferometer from small to medium satellites

Colin Dandumont, Denis Defrère, Jens Kammerer, Olivier Absil, Sascha Quanz, Jérôme Loicq

JATIS, Vol. 6, Issue 03, 035004, (September 2020) https://doi.org/10.1117/12.10.1117/1.JATIS.6.3.035004

KEYWORDS: Planets, Exoplanets, Interferometers, Stars, Satellites, Signal to noise ratio, Exoplanetary science, Sensors, Interference (communication), Telescopes

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Proceedings Article | 24 July 2018 Presentation + Paper

Characterizing the atmosphere of Proxima b with a space-based mid-infrared nulling interferometer

D. Defrère, A. Léger, O. Absil, A. Garcia Munoz, J. Grenfell, M. Godolt, J. Loicq, J. Kammerer, S. Quanz, H. Rauer, L. Schifano, F. Tian

Proceedings Volume 10701, 107011H (2018) https://doi.org/10.1117/12.2312839

KEYWORDS: Planets, Mid-IR, Stars, Interferometers, Exoplanets, Space telescopes, Earth's atmosphere, Telescopes, Photons, Atmospheric chemistry

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Proceedings Article | 9 July 2018 Presentation + Paper

Exoplanet science with a space-based mid-infrared nulling interferometer

Sascha Quanz, Jens Kammerer, Denis Defrère, Olivier Absil, Adrian Glauser, Daniel Kitzmann

Proceedings Volume 10701, 107011I (2018) https://doi.org/10.1117/12.2312051

KEYWORDS: Planets, Exoplanets, Interferometers, Space telescopes, Monte Carlo methods, Mid-IR

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Showing 5 of 9 publications

Conference Committee Involvement (1)

Optical and Infrared Interferometry and Imaging IX

17 June 2024 | Yokohama, Japan

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