Dr. Ravinder K. Banyal Profile

Dr. Ravinder K. Banyal

Associate Professor at Indian Institute of Astrophysics

SPIE Involvement:

Author

Publications (20)

Proceedings Article | 30 September 2024 Presentation + Paper

Presentation + Paper

Design and simulation of non-redundant aperture masks for SCALES

Mackenzie Lach, Stephanie Sallum, Ravinder Banyal, Natalie Batalha, Natasha Batalha, Geoff Blake, Timothy Brandt, Zackery Briesemeister, Aditi Desai, Josh Eisner, Wen-fai Fong, Tom Greene, Mitsuhiko Honda, Isabel Kain, Charlie Kilpatrick, Katherine de Kleer, Michael Liu, Bruce Macintosh, Raquel Martinez, Dimitri Mawet, Brittany Miles, Caroline Morley, Imke de Pater, Diana Powell, Patrick Sheehan, Andrew Skemer, Justin Spilker, Deno Stelter, Jordan Stone, Arun Surya, Sivarani Thirupathi, Kevin Wagner, Yifan Zhou

Proceedings Volume 13095, 130950Y (2024) https://doi.org/10.1117/12.3019285

KEYWORDS: Design, Mirrors, Image restoration, Adaptive optics, Solar system, Optical path differences, Exoplanets, Telescopes, Spatial resolution, Source mask optimization

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Proceedings Article | 17 September 2024 Poster + Paper

Poster + Paper

Characterizing exoplanet atmospheres with SCALES medium-spectral-resolution angular differential imaging

Aditi Desai, Steph Sallum, Ravinder Banyal, Natalie Batalha, Natasha Batalha, Geoff Blake, Tim Brandt, Zack Briesemeister, Katherine de Kleer, Imke de Pater, Josh Eisner, Wen-fai Fong, Tom Greene, Mitsuhiko Honda, Isabel Kain, Charlie Kilpatrick, Mackenzie Lach, Mike Liu, Bruce Macintosh, Raquel Martinez, Dimitri Mawet, Brittany Miles, Caroline Morley, Diana Powell, Patrick Sheehan, Andrew Skemer, R. Deno Stelter, Jordan Stone, Arun Surya, Sivarani Thirupathi, Kevin Wagner, Yifan Zhou

Proceedings Volume 13096, 130969C (2024) https://doi.org/10.1117/12.3020521

KEYWORDS: Planets, Stars, Point spread functions, Exoplanets, Speckle, Atmospheres, Spectral resolution, Atmospheric modeling, Simulations, Signal to noise ratio

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Proceedings Article | 22 July 2024 Presentation + Paper

Presentation + Paper

Innovations and advances in instrumentation at the W. M. Keck Observatory, vol. III

Marc Kassis, Carlos Alvarez, Ashley Baker, Jeb Bailey, Ravinder Banyal, Robert Bertz, Charles Beichman, Antonin Bouchez, Aaron Brown, Matthew Brown, Kevin Bundy, Randall Campbell, Mark Chun, Jeff Cooke, William Deich, Richard Dekany, Greg Doppmann, Christopher Fassnacht, Jocelyn Ferrara, Michael Fitzgerald, Christoffer Fremling, Jason Fucik, Steven Gibson, Peter Gillingham, Karl Glazebrook, Timothee Greffe, Samuel Halverson, Grant Hill, Lynne Hillenbrand, Philip Hinz, Bradford Holden, Andrew Howard, Daniel Huber, Tucker Jones, Carolyn Jordan, Nemanja Jovanovic, Isabell Kain, Mansi Kasliwal, Evan Kirby, Quinn Konopacky, Shanti Krishnan, Shri Kulkarni, Renate Kupke, Kyle Lanclos, James Larkin, Scott Lilley, Larry Lingvay, Jessica Lu, James Lyke, Nicholas MacDonald, Christopher Martin, John Mather, Mateusz Matuszewski, Dimitri Mawet, Rosalie McGurk, Eduardo Marin, Bob Meeks, Maxwell Millar-Blanchaer, Reston Nash, James Neill, John O'Meara, Rishi Pahuja, Eliad Peretz, Nikolaus Prusinski, Matthew Radovan, Kodi Rider, Mitsuko Roberts, Connie Rockosi, Ryan Rubenzahl, Stephanie Sallum, Dale Sandford, Maureen Savage, Andy Skemer, Roger Smith, Charles Steidel, Jonathan Steiner, Deno Stelter, Josh Walawender, Kyle Westfall, Peter Wizinowich, Shelley Wright, Truman Wold, Jake Zimmer

Proceedings Volume 13096, 1309606 (2024) https://doi.org/10.1117/12.3016181

KEYWORDS: Equipment, Adaptive optics, Design, Observatories, Spectrographs, Imaging systems, Sensors, Telescopes, Spectroscopy, Imaging spectroscopy

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Proceedings Article | 19 July 2024 Poster

Poster

Optical design and analysis of calibration system for SCALES instrument

Amirul Hasan, Ravinder K. Banyal, Renate Kupke, Andrew J. Skemer, Ajin Prakash, Sivarani Thirupathi, Deno Stelter, Ramya Sethuram, Arun Surya, Nick MacDonald, Steph Sallum, Mackenzie Lach, Scott Lilley

Proceedings Volume 13096, 130966X (2024) https://doi.org/10.1117/12.3019833

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Proceedings Article | 18 July 2024 Poster + Paper

Poster + Paper

Performance analysis of SCALES final optical design: end to end modeling

Arun Surya, Renate Kupke, Deno Stelter, Phil Hinz, Stephanie Sallum, Amirul Hasan, Andrew Skemer, Sivarani Thirupathi, Ravinder Banyal, Athira Unni

Proceedings Volume 13096, 130966W (2024) https://doi.org/10.1117/12.3019578

KEYWORDS: Spectrographs, Modeling, Sensors, Point spread functions, Optical design, Tunable filters, Zemax, Spectral resolution, Ray tracing, Optical filters

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Proceedings Article | 18 July 2024 Presentation + Paper

Presentation + Paper

SCALES status report

R. Deno Stelter, Andrew Skemer, Stephanie Sallum, Nick MacDonald, Renate Kupke, Christopher Ratliff, Cyril Bourgenot, Gerald Cabak, Michael Gonzales, Cristian Rodriguez, Aaron Hunter, Ravinder Banyal, Thirupathi Sivarani, Michael Fitzgerald, Marc Kassis, Olivier Absil, Carlos Alvarez, Natatsha Batalha, Marc-André Boucher, Timothy Brandt, Zack Briesemeister, Katherine de Kleer, Imke de Pater, William Deich, Devika Dicakar, Étienne Gauvin, Thomas Greene, Armirul Hasan, Philip Hinz, Rebecca Jensen-Clem, Christopher Johnson, Govinda K. V., Isabel Kain, Mackenzie Lach, Jean-Thomas Landry, Michael Liu, Jim Lyke, Kenneth Magone, Eduardo Marin, Raquel Martinez, Dimitri Mawet, Rosalie McGurk, Brittany Miles, Ajin Parkash, Dale Sandford, Ramya Sethuram, Patrick Sheehan, Ji Man Sohn, Jordan Stone, Arun Surya, Hari Varshney, Eric Wang

Proceedings Volume 13096, 1309619 (2024) https://doi.org/10.1117/12.3020806

KEYWORDS: Mirrors, Cryostats, Coronagraphy, Spectrographs, Telescopes, Imaging systems, Exoplanets

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Proceedings Article | 6 October 2023 Presentation

Presentation

End to end modeling of SCALES spectrograph for Keck Observatory

Arun Surya, Renate Kupke, Deno Stelter, Philip Hinz, Amirul Hasan, Andrew Skemer, Stephanie Sallum, Thirupathi Sivarani, Ravinder Banyal

Proceedings Volume 12680, 1268005 (2023) https://doi.org/10.1117/12.2677759

KEYWORDS: Spectrographs, Modeling, Keck Observatory, Equipment, Point spread functions, Geometrical optics, Data modeling, Spectroscopes, Spectral resolution, Microlens

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Proceedings Article | 5 October 2023 Poster + Paper

Poster + Paper

Simulating medium-spectral-resolution exoplanet characterization with SCALES angular/reference differential imaging

Aditi Desai, Stephanie Sallum, Ravinder Banyal, Natalie Batalha, Natasha Batalha, Geoff Blake, Tim Brandt, Zack Briesemeister, Katherine de Kleer, Imke de Pater, Josh Eisner, Wen-fai Fong, Tom Greene, Mitsuhiko Honda, Isabel Kain, Charlie Kilpatrick, Mackenzie Lach, Mike Liu, Bruce Macintosh, Raquel Martinez, Dimitri Mawet, Brittany Miles, Caroline Morley, Diana Powell, Patrick Sheehan, Andrew Skemer, Justin Spilker, R. Deno Stelter, Jordan Stone, Arun Surya, Sivarani Thirupathi, Kevin Wagner, Yifan Zhou

Proceedings Volume 12680, 1268023 (2023) https://doi.org/10.1117/12.2677846

KEYWORDS: Exoplanets, Planets, Stars, Spectroscopy, Spectrographs, Spectral resolution, Speckle, Simulations, Lens arrays, Iterated function systems

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Proceedings Article | 5 October 2023 Poster + Paper

Poster + Paper

Designing custom medium resolution observing modes to trace planet accretion with SCALES

Raquel Martinez, Steph Sallum, Ravinder Banyal, Natalie Batalha, Natasha Batalha, Geoff Blake, Tim Brandt, Zack Briesemeister, Katherine de Kleer, Imke de Pater, Aditi Desai, Josh Eisner, Wen-fai Fong, Tom Greene, Mitsuhiko Honda, Isabel Kain, Charlie Kilpatrick, Renate Kupke, Mackenzie Lach, Mike Liu, Bruce Macintosh, Dimitri Mawet, Brittany Miles, Caroline Morley, Diana Powell, Patrick Sheehan, Andrew Skemer, Justin Spilker, Deno Stelter, Jordan Stone, Arun Surya, Sivarani Thirupathi, Kevin Wagner, Yifan Zhou

Proceedings Volume 12680, 126801W (2023) https://doi.org/10.1117/12.2677530

KEYWORDS: Planets, Spectroscopy, Exoplanets, Data modeling, Tunable filters, Thermography, Systems modeling, Spectrographs, Planetary systems, Optical filters

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Proceedings Article | 5 October 2023 Presentation + Paper

Presentation + Paper

The slicer combined with array of lenslets for exoplanet spectroscopy (SCALES): driving science cases and expected outcomes

Steph Sallum, Andrew Skemer, Deno Stelter, Ravinder Banyal, Natalie Batalha, Natasha Batalha, Geoff Blake, Tim Brandt, Zack Briesemeister, Katherine de Kleer, Imke de Pater, Aditi Desai, Josh Eisner, Wen-fai Fong, Tom Greene, Mitsuhiko Honda, Rebecca Jensen-Clem, Isabel Kain, Charlie Kilpatrick, Renate Kupke, Mackenzie Lach, Michael Liu, Bruce Macintosh, Raquel Martinez, Dimitri Mawet, Brittany Miles, Caroline Morley, Diana Powell, Ramya Sethuram, Patrick Sheehan, Justin Spilker, Jordan Stone, Arun Surya, Sivarani Thirupathi, Athira Unni, Kevin Wagner, Yifan Zhou

Proceedings Volume 12680, 1268003 (2023) https://doi.org/10.1117/12.2677831

KEYWORDS: Planets, Simulations, Exoplanets, Equipment, Spectroscopes, Spectrographs, Solar system, Lens arrays, Keck Observatory, Galactic astronomy

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Proceedings Article | 5 October 2023 Poster + Paper

Poster + Paper

Recovering simulated planet and disk signals using SCALES aperture masking

Mackenzie Lach, Steph Sallum, Ravinder Banyal, Natalie Batalha, Geoff Blake, Tim Brandt, Zackery Briesemeister, Aditi Desai, Josh Eisner, Wen-fai Fong, Tom Greene, Mitsuhiko Honda, Isabel Kain, Charlie Kilpatrick, Katherine de Kleer, Michael Liu, Bruce Macintosh, Raquel Martinez, Dimitri Mawet, Brittany Miles, Caroline Morley, Imke de Pater, Diana Powell, Patrick Sheehan, Andrew Skemer, Justin Spilker, Deno Stelter, Jordan Stone, Arun Surya, Sivarani Thirupathi, Kevin Wagner, Yifan Zhou

Proceedings Volume 12680, 1268024 (2023) https://doi.org/10.1117/12.2677954

KEYWORDS: Design and modelling, Planets, Imaging systems, Exoplanets

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Proceedings Article | 29 August 2022 Presentation + Paper

Presentation + Paper

Design of an IR imaging channel for the Keck Observatory SCALES instrument

Ravinder K. Banyal, Armirul Hasan, Reni Kupke, Hari Mohan Varshney, Ajin Prakaesh, T. Sivarani, Andy J. Skemer, Nick MacDonald, Steph Sallum, Will Deich, Michael P. Fitzgerald, K. V. Govinda, Chris Ratliff, Ramya Sethuram, Deno Stelter, Arun Surya, Eric Wang

Proceedings Volume 12188, 121881U (2022) https://doi.org/10.1117/12.2630696

KEYWORDS: Imaging systems, Sensors, Mirrors, Iterated function systems, Exoplanets, Image filtering, Computer aided design, Coronagraphy, Telescopes, Adaptive optics

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Proceedings Article | 29 August 2022 Presentation + Paper

Presentation + Paper

Design of SCALES: a 2-5 micron coronagraphic integral field spectrograph for Keck Observatory

Andrew Skemer, R. Deno Stelter, Stephanie Sallum, Nicholas MacDonald, Renate Kupke, Christopher Ratliff, Ravinder Banyal, Amirul Hasan, Hari Mohan Varshney, Arun Surya, Ajin Prakaesh, Sivarani Thirupathi, Ramya Sethuram, Govinda K.V., Michael Fitzgerald, Eric Wang, Marc Kassis, Olivier Absil, Carlos Alvarez, Natasha Batalha, Marc-André Boucher, Cyril Bourgenot, Timothy Brandt, Zackery Briesemeister, Katherine de Kleer, Imke de Pater, William Deich, Devika Divakar, Guillaume Filion, Étienne Gauvin, Michael Gonzales, Thomas Greene, Philip Hinz, Rebecca Jensen-Clem, Christopher Johnson, Isabel Kain, Gabriel Kruglikov, Mackenzie Lach, Jean-Thomas Landry, Jialin Li, Michael Liu, James Lyke, Kenneth Magnone, Eduardo Marin, Emily Martin, Raquel Martinez, Dimitri Mawet, Brittany Miles, Dale Sandford, Patrick Sheehan, Ji Man Sohn, Jordan Stone

Proceedings Volume 12184, 121840I (2022) https://doi.org/10.1117/12.2630577

KEYWORDS: Exoplanets, Spectrographs, Planets, Sensors, Coronagraphy, Imaging systems, Adaptive optics, Mirrors, Spectroscopy

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Proceedings Article | 29 August 2022 Presentation + Paper

Presentation + Paper

Innovations and advances in instrumentation at the W. M. Keck Observatory, vol. II

Marc Kassis, Steve Allen, Carlos Alvarez, Ravinder Banyal, Robert Bertz, Charles Beichman, Aaron Brown, Matthew Brown, Gerald Cabak, Kevin Bundy, Sylvain Cetre, Jason Chin, Mark Chun, Will Deich, Richard Dekany, Jacques Delorme, Mark Devenot, Greg Doppmann, Michael Fitzgerald, Jason Fucik, Grant Hill, Philip Hinz, Bradford Holden, Andrew Howard, Maodong Gao, Steve Gibson, Percy Gomez, Colby Gottschalk, Peter Gillingham, Tucker Jones, Nemanja Jovanovic, Evan Kirby, Quinn Konopacky, Shanti Krishnan, Renate Kupke, James Larkin, Stephanie Leifer, Hilton Lewis, Scott Lilley, Jessica Lu, James Lyke, Nick MacDonald, Eduardo Marin, Matt Matuszewski, Dimitri Mawet, Rosalie McGurk, Maxwell Millar-Blanchaer, Reston Nash, Craig Nance, James Neill, John O'Meara, Eliad Peretz, Claire Poppett, John Mather, Matthew Radovan, Mitsuko Roberts, Sam Ragland, Kodi Rider, Constance Rockosi, Dale Sandfor, Boqiang Shen, Charles Steidel, Sunil Simha, Andy Skemer, Deno Stelter, Avinash Surendran, James Thorne, Ben McCarney, Kyle Lanclos, Ashley Baker, Ryan Rubenzahl, Arpita Roy, Sam Halverson, Jerry Edelstein, Christopher Martin, Maureen Savage, Dale Sandford, Stephanie Sallum, Josh Walawender, Peter Wizinowich, Kyle Westfall, Kerry Vahala, Shelley Wright, Truman Wold, Sherry Yeh

Proceedings Volume 12184, 1218405 (2022) https://doi.org/10.1117/12.2628630

KEYWORDS: Adaptive optics, Spectrographs, Exoplanets, Sensors, Spectroscopy, Imaging systems, Telescopes, Planets, Cameras, Observatories

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Proceedings Article | 13 December 2020 Poster + Paper

Poster + Paper

Using a passively stabilized Fabry-Perot etalon for determining instrumental artifacts in a spectrograph

Tanya Das, Ravinder Banyal, T. Sivarani, S. Sriram

Proceedings Volume 11447, 1144748 (2020) https://doi.org/10.1117/12.2562007

KEYWORDS: Fabry–Perot interferometers, Spectrographs, Calibration, Doppler effect, Spectroscopes, Velocity measurements, Distortion, Stars, Instrument modeling, Telescopes

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SPIE Journal Paper | 10 June 2019

Estimation and correction of the instrumental perturbations of Vainu Bappu Telescope Echelle spectrograph using a model-based approach

Sireesha Chamarthi, Ravinder Banyal, Sriram Sripadmanabhan

JATIS, Vol. 5, Issue 03, 038003, (June 2019) https://doi.org/10.1117/12.10.1117/1.JATIS.5.3.038003

KEYWORDS: Spectrographs, Zemax, Calibration, Optical components, Sensors, Model-based design, Instrument modeling, Vignetting, Telescopes, Prisms

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SPIE Journal Paper | 5 June 2019 Open Access

Open Access

Toward precision radial velocity measurements using Echelle spectrograph at Vainu Bappu Telescope (Erratum)

Sireesha Chamarthi, Ravinder Banyal, Sriram Sripadmanabhan

JATIS, Vol. 5, Issue 02, 029801, (June 2019) https://doi.org/10.1117/12.10.1117/1.JATIS.5.2.029801

KEYWORDS: Velocity measurements, Spectrographs, Telescopes, Astronomical telescopes, Astrophysics

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SPIE Journal Paper | 20 May 2019

Toward precision radial velocity measurements using Echelle spectrograph at Vainu Bappu Telescope

Sireesha Chamarthi, Ravinder Banyal, Sriram Sripadmanabhan

JATIS, Vol. 5, Issue 02, 028004, (May 2019) https://doi.org/10.1117/12.10.1117/1.JATIS.5.2.028004

KEYWORDS: Spectrographs, Stars, Iodine, Telescopes, Absorption, Calibration, Velocity measurements, Exoplanets, Iodine cells, Charge-coupled devices

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Proceedings Article | 9 July 2018 Paper

Paper

Estimation of asymmetries in point spread function for the echelle spectrograph operating at Vainu Bappu Telescope for high precision radial velocity studies

Sireesha Chamarthi, Ravinder Banyal, S. Sriram

Proceedings Volume 10702, 1070275 (2018) https://doi.org/10.1117/12.2312508

KEYWORDS: Spectrographs, Point spread functions, Zemax, Iodine, Stars, Calibration, Telescopes, Doppler effect, Absorption

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Proceedings Article | 6 July 2018 Paper

Paper

Development of a stabilized Fabry-Perot based wavelength calibrator for precision Doppler spectroscopy

Tanya Das, Ravinder Banyal, S. Kathiravan, T. Sivarani, Ravindra B.

Proceedings Volume 10702, 107026A (2018) https://doi.org/10.1117/12.2312472

KEYWORDS: Fabry–Perot interferometers, Calibration, Spectrographs, Spectroscopy, Precision calibration

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Showing 5 of 20 publications

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