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NIRPS: an adaptive-optics assisted radial velocity spectrograph to chase exoplanets around M-stars
Author(s): 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
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Paper 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.

Paper Details

Date Published: 1 September 2017
PDF: 15 pages
Proc. SPIE 10400, Techniques and Instrumentation for Detection of Exoplanets VIII, 1040018 (1 September 2017); doi: 10.1117/12.2275660
Show Author Affiliations
F. Wildi, Observatoire de Genève (Switzerland)
N. Blind, Observatoire de Genève (Switzerland)
V. Reshetov, NRC - Herzberg Astronomy & Astrophysics (Canada)
O. Hernandez, Univ. de Montréal (Canada)
L. Genolet, Observatoire de Genève (Switzerland)
U. Conod, Observatoire de Genève (Switzerland)
M. Sordet, Observatoire de Genève (Switzerland)
A. Segovilla, Observatoire de Genève (Switzerland)
J. L. Rasilla, Instituto de Astrofísica de Canarias (Spain)
D. Brousseau, Univ. Laval (Canada)
S. Thibault, Univ. Laval (Canada)
B. Delabre, European Southern Observatory (Germany)
T. Bandy, Univ. Bern (Switzerland)
M. Sarajlic, Univ. Bern (Switzerland)
A. Cabral, Univ. de Lisboa (Portugal)
S. Bovay, Observatoire de Genève (Switzerland)
Ph. Vallée, Univ. de Montréal (Canada)
F. Bouchy, Observatoire de Genève (Switzerland)
R. Doyon, Univ. de Montréal (Canada)
E. Artigau, Univ. de Montréal (Canada)
F. Pepe, Observatoire de Genève (Switzerland)
J. Hagelberg, Institut de Planétologie et d’Astrophysique de Grenoble, Univ. Grenoble Alpes, CNRS (France)
C. Melo, European Southern Observatory (Germany)
X. Delfosse, Institut de Planétologie et d’Astrophysique de Grenoble, Univ. Grenoble Alpes, CNRS (France)
P. Figueira, Univ. do Porto (Portugal)
N. C. Santos, Univ. do Porto (Portugal)
J. I. González Hernández, Instituto de Astrofísica de Canarias (Spain)
J. R. de Medeiros, Federal Univ. of Rio Grande do Sul (Brazil)
R. Rebolo, Instituto de Astrofísica de Canarias (Spain)
Ch. Broeg, Univ. Bern (Switzerland)
W. Benz, Univ. Bern (Switzerland)
I. Boisse, Aix Marseille Univ., CNRS, Lab. d’Astrophysique Marseille (France)
L. Malo, Univ. de Montréal (Canada)
U. Käufl, European Southern Observatory (Germany)
L. Saddlemyer, NRC - Herzberg Astronomy & Astrophysics (Canada)

Published in SPIE Proceedings Vol. 10400:
Techniques and Instrumentation for Detection of Exoplanets VIII
Stuart Shaklan, Editor(s)

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