Dr. Angelle Tanner Profile

Dr. Angelle Tanner

Associate Professor at Mississippi State Univ

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Publications (8)

SPIE Journal Paper | 22 October 2024

Starshade exoplanet data challenge: what we learned

Mario Damiano, Stuart Shaklan, Renyu Hu, Brian Dunne, Angelle Tanner, Aly Nida, Joseph Carson, Sergi Hildebrandt, Doug Lisman

JATIS, Vol. 10, Issue 04, 048001, (October 2024) https://doi.org/10.1117/12.10.1117/1.JATIS.10.4.048001

KEYWORDS: Planets, Exoplanets, Engineering, Error analysis, Equipment, Point spread functions, Independent component analysis, Stars, Image analysis, Coronagraphy

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Starshade is one of the technologies that will enable the observation and characterization of small planets around nearby stars through direct imaging. Extensive models have been developed to describe a starshade’s optical performance and noise budget in exoplanet imaging. The Starshade Exoplanet Data Challenge was designed to validate this noise budget and evaluate the capabilities of image-processing techniques by inviting community participating teams to analyze >1000 simulated images of hypothetical exoplanetary systems observed through a starshade. Because the starshade would suppress the starlight so well, the dominant noise source remaining in the images becomes the exozodiacal disks and their structures. We summarize the techniques used by the participating teams and compare their findings with the truth. With an independent component analysis to remove the background, ∼70% of the inner planets (close to the inner working angle) have been detected along with ∼30% of the outer planets. Planet detection becomes more difficult in the cases of higher disk inclination as the false negative and false positive counts increase. Interestingly, we found little difference in the planet detection rate between 10−10 and 10−9 instrument contrast, confirming that the dominant limitations are from the astrophysical background and not the performance of the starshade. A non-parametric background calibration scheme, such as the independent component analysis reported here, results in a mean residual of 10% the background brightness. This background estimation error leads to substantial false positives and negatives and systematic bias in the planet flux estimation and should be included in the estimation of the planet detection signal-to-noise ratio for imaging using a starshade and also a coronagraph that delivers exozodi-limited imaging. These results corroborate the starshade noise budget and provide new insight into background calibration that will be useful for anticipating the science capabilities of future high-contrast imaging space missions.

Proceedings Article | 24 August 2024 Poster

Starshade Exoplanet Data Challenge: what we learned

Renyu Hu, Mario Damiano, Stuart Shaklan, Brian Dunne, Angelle Tanner, Joseph Carson, Sergi Hildebrandt, Doug Lisman

Proceedings Volume 13092, 130925B (2024) https://doi.org/10.1117/12.3018149

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Proceedings Article | 23 August 2024 Presentation + Paper

Calibration for astrophysics using an artificial star with NIST-traceable distribution of luminous energy (CANDLE) instrument development

Eliad Peretz, Susana Deustua, Joe Rice, Brian Alberding, Eric Shirley, Thinh Bui, Keshet Shavit, Daniel Kuesters, Greg Aldering, Dmitry Vorobiev, Jonathan Papa, Ralph Bohlin, Benjamin Rose, Justin Albert, Piotr Pachowicz, Jean Thomas Landry, Etienne Gauvin, Thomas Michaud-Bayens, Greg Kopp, John Mather, Peter Plavchan, Angelle Tanner

Proceedings Volume 13092, 1309207 (2024) https://doi.org/10.1117/12.3020319

KEYWORDS: Calibration, Stars, Telescopes, Monochromators, Equipment, Observatories, Fiber lasers, Mirrors, Dark energy, James Webb Space Telescope

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Proceedings Article | 26 September 2013 Paper

Precision near-infrared radial velocity instrumentation II: noncircular core fiber scrambler

Peter Plavchan, M. Bottom, P. Gao, J. Wallace, B. Mennesson, D. Ciardi, S. Crawford, S. Lin, C. Beichman, C. Brinkworth, J. Johnson, C. Davison, R. White, G. Anglada-Escude, K. von Braun, G. Vasisht, L. Prato, S. Kane, A. Tanner, B. Walp, S. Mills

Proceedings Volume 8864, 88640G (2013) https://doi.org/10.1117/12.2023696

KEYWORDS: Mirrors, Spectrographs, Calibration, Cameras, Telescopes, Stars, Visible radiation, Velocity measurements, Planets, K band

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We have built and commissioned a prototype agitated non-circular core ber scrambler for precision spectroscopic radial velocity measurements in the near-infrared H band. We have collected the rst on-sky performance and modal noise tests of these novel bers in the near-infrared at H and K bands using the CSHELL spectrograph at the NASA InfraRed Telescope Facility (IRTF). We discuss the design behind our novel reverse injection of a red laser for co-alignment of star-light with the ber tip via a corneWe have built and commissioned a prototype agitated non-circular core fiber scrambler for precision spectroscopic radial velocity measurements in the near-infrared H band. We have collected the first on-sky performance and modal noise tests of these novel fibers in the near-infrared at H and K bands using the CSHELL spectrograph at the NASA InfraRed Telescope Facility (IRTF). We discuss the design behind our novel reverse injection of a red laser for co-alignment of star-light with the fiber tip via a corner cube and visible camera. We summarize the practical details involved in the construction of the fiber scrambler, and the mechanical agitation of the fiber at the telescope. We present radial velocity measurements of a bright standard star taken with and without the fiber scrambler to quantify the relative improvement in the obtainable blaze function stability, the line spread function stability, and the resulting radial velocity precision. We assess the feasibility of applying this illumination stabilization technique to the next generation of near-infrared spectrographs such as iSHELL on IRTF and an upgraded NIRSPEC at Keck. Our results may also be applied in the visible for smaller core diameter fibers where Fiber modal noise is a significant factor, such as behind an adaptive optics system or on a small < 1 meter class telescope such as is being pursued by the MINERVA and LCOGT collaborations.r cube and visible camera. We summarize the practical details involved in the construction of the ber scrambler, and the mechanical agitation of the ber at the telescope. We present radial velocity measurements of a bright standard star taken with and without the ber scrambler to quantify the relative improvement in the obtainable blaze function stability, the line spread function stability, and the resulting radial velocity precision. We assess the feasibility of applying this illumination stabilization technique to the next generation of near-infrared spectrographs such as iSHELL on IRTF and an upgraded NIRSPEC at Keck. Our results may also be applied in the visible for smaller core diameter bers where ber modal noise is a signi cant factor, such as behind an adaptive optics system or on a small < 1 meter class telescope such as is being pursued by the MINERVA and LCOGT collaborations.

Proceedings Article | 26 September 2013 Paper

Precision near-infrared radial velocity instrumentation I: absorption gas cells

Peter Plavchan, G. Anglada-Escude, R. White, P. Gao, C. Davison, S. Mills, C. Beichman, C. Brinkworth, J. Johnson, M. Bottom, D. Ciardi, K. Wallace, B. Mennesson, K. von Braun, G. Vasisht, L. Prato, S. Kane, A. Tanner, B. Walp, S. Crawford, S. Lin

Proceedings Volume 8864, 88641J (2013) https://doi.org/10.1117/12.2023690

KEYWORDS: Data modeling, Methane, Calibration, Absorption, Spectrographs, Stars, Planets, Exoplanets, Velocity measurements, Satellites

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Proceedings Article | 15 September 2011 Paper

The exoplanet microlensing survey by the proposed WFIRST Observatory

Richard Barry, Jeffery Kruk, Jay Anderson, Jean-Philippe Beaulieu, David Bennett, Joseph Catanzarite, Ed Cheng, Scott Gaudi, Neil Gehrels, Stephen Kane, Jonathan Lunine, Takahiro Sumi, Angelle Tanner, Wesley Traub

Proceedings Volume 8151, 81510L (2011) https://doi.org/10.1117/12.898574

KEYWORDS: Planets, Stars, Exoplanets, Observatories, Signal detection, Space telescopes, Planetary systems, Telescopes, Astronomy, Infrared telescopes

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Proceedings Article | 29 June 2006 Paper

Detection and mass characterization of terrestrial planets in the habitable zone with SIM PlanetQuest

A. Tanner, J. Catanzarite, M. Shao

Proceedings Volume 6268, 626847 (2006) https://doi.org/10.1117/12.671877

KEYWORDS: Planets, Stars, Planetary systems, Statistical analysis, Monte Carlo methods, Target detection, Exoplanets, Signal detection, Jupiter, Michelson interferometers

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Proceedings Article | 29 June 2000 Open Access

Is the galactic center source, IRS 21, as large as it appears?

Angelle Tanner, Andrea Ghez, Mark Morris, Eric Becklin, A. Cotera, Michael Ressler

Proceedings Volume 4005, (2000) https://doi.org/10.1117/12.390142

KEYWORDS: Infrared imaging, Mid-IR, Stars, Polarization, Surface conduction electron emitter displays, Scattering, Point spread functions, Light scattering, Light, Infrared telescopes

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