Dr. Claudio Melo Profile

Dr. Claudio Melo

at European Southern Observatory

SPIE Involvement:

Author

Publications (5)

Proceedings Article | 13 December 2020 Presentation

NIRPS: status updates and project overview

Étienne Artigau, François Bouchy, René Doyon, Claudio Melo, Xavier Delfosse, François Wildi, Christophe Lovis, Pedro Figueira, Bruno Canto Martins, Jonay González Hernández, Simon Thibault, Vladimir Reshetov, Francesco Pepe, Nuno Santos, José Renan de Medeiros, Rafael Rebolo, Neil Cook, Nicolas Blind, Isabelle Boisse, Denis Brousseau, Uriel Conod, David Lafrenière, Izan Leão, Lison Malo, Mathieu Ouellet, Anne-Sophie Poulin-Girard, Stéphane Udry, Philippe Vallée, Andrew Cumming, Michael Sordet, Allan De Medeiros

Proceedings Volume 11447, 114471K (2020) https://doi.org/10.1117/12.2561090

KEYWORDS: Spectrographs, Telescopes, Lanthanum, Planets, Spectroscopes, Exoplanets, Aerospace engineering, Space operations, James Webb Space Telescope

Read Abstract +

Proceedings Article | 9 July 2018 Presentation

The near-infrared planet searcher (NIRPS) (Conference Presentation)

Rene Doyon, François Bouchy, Étienne Artigau, Olivier Hernandez, François Wildi, Claudio Melo, Philippe Vallée, Simon Thibault, Xavier Delfosse, Christophe Lovis, Francesco Pepe, Pedro Figueira, Vladimir Reshetov, Nuno Santos, Lison Malo, Mathieu Ouellet, Denis Brousseau, Rafael Rebolo-López, Nicolas Blind, Uriel Condo, Stéphane Dry, Jonay González Hernández, Bruno Chazelas, Bruno Canto Martins, Jose de Medeiros

Proceedings Volume 10702, 1070210 (2018) https://doi.org/10.1117/12.2313050

KEYWORDS: Planets, Infrared telescopes, Infrared radiation, Spectrographs, Telescopes, Lanthanum

Read Abstract +

Proceedings Article | 1 September 2017 Paper

NIRPS: an adaptive-optics assisted radial velocity spectrograph to chase exoplanets around M-stars

F. Wildi, N. Blind, V. Reshetov, O. Hernandez, L. Genolet, U. Conod, M. Sordet, A. Segovilla, J. L. Rasilla, D. Brousseau, S. Thibault, B. Delabre, T. Bandy, M. Sarajlic, A. Cabral, S. Bovay, Ph. Vallée, F. Bouchy, R. Doyon, E. Artigau, F. Pepe, J. Hagelberg, C. Melo, X. Delfosse, P. Figueira, N. C. Santos, J. I. González Hernández, J. R. de Medeiros, R. Rebolo, Ch. Broeg, W. Benz, I. Boisse, L. Malo, U. Käufl, L. Saddlemyer

Proceedings Volume 10400, 1040018 (2017) https://doi.org/10.1117/12.2275660

KEYWORDS: Spectrographs, Adaptive optics, Planets, Exoplanets, Velocity measurements, Stars, Spectroscopy, Optical fibers, Space operations, Interference (communication)

Read Abstract +

Since 1st light in 2002, HARPS has been setting the standard in the exo-planet detection by radial velocity (RV) measurements[1]. Based on this experience, our consortium is developing a high accuracy near-infrared RV spectrograph covering YJH bands to detect and characterize low-mass planets in the habitable zone of M dwarfs. It will allow RV measurements at the 1-m/s level and will look for habitable planets around M- type stars by following up the candidates found by the upcoming space missions TESS, CHEOPS and later PLATO. NIRPS and HARPS, working simultaneously on the ESO 3.6m are bound to become a single powerful high-resolution, high-fidelity spectrograph covering from 0.4 to 1.8 micron. NIRPS will complement HARPS in validating earth-like planets found around G and K-type stars whose signal is at the same order of magnitude than the stellar noise. Because at equal resolving power the overall dimensions of a spectrograph vary linearly with the input beam étendue, spectrograph designed for seeing-limited observations are large and expensive. NIRPS will use a high order adaptive optics system to couple the starlight into a fiber corresponding to 0.4” on the sky as efficiently or better than HARPS or ESPRESSO couple the light 0.9” fiber. This allows the spectrograph to be very compact, more thermally stable and less costly. Using a custom tan(θ)=4 dispersion grating in combination with a start-of-the-art Hawaii4RG detector makes NIRPS very efficient with complete coverage of the YJH bands at 110’000 resolution. NIRPS works in a regime that is in-between the usual multi-mode (MM) where 1000’s of modes propagates in the fiber and the single mode well suited for perfect optical systems. This regime called few-modes regime is prone to modal noise- Results from a significant R and D effort made to characterize and circumvent the modal noise show that this contribution to the performance budget shall not preclude the RV performance to be achieved.

Proceedings Article | 28 July 2014 Paper

Sky background subtraction with fiber-fed spectrographs

M. Puech, M. Rodrigues, Y. Yang, H. Flores, F. Royer, K. Disseau, T. Gonçalves, F. Hammer, M. Cirasuolo, C. Evans, G. Li Causi, R. Maiolino, C. Melo

Proceedings Volume 9147, 91476L (2014) https://doi.org/10.1117/12.2055137

KEYWORDS: Spectrographs, Switching, Light scattering, Signal to noise ratio, Absorption, Optical fibers, Error analysis, Observatories, Astronomy, Signal processing

Read Abstract +

Proceedings Article | 9 July 2008 Paper

Detector upgrade for FLAMES: GIRAFFE gets red eyes

Claudio Melo, Mark Downing, Paul Jorden, Luca Pasquini, Sebastian Deiries, Andrew Kelt, Dominique Naef, Reinhard Hanuschik, Ralf Palsa, Roberto Castillo, Eduardo Peña, Eduardo Bendek, Mark Gieles

Proceedings Volume 7014, 70143B (2008) https://doi.org/10.1117/12.789092

KEYWORDS: Sensors, Quantum efficiency, Charge-coupled devices, Spectrographs, Calibration, Antireflective coatings, Spectral resolution, Stars, Databases, Optical fibers

Read Abstract +

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