The precision radial velocity error budget for the Gemini High-resolution Optical SpecTrograph (GHOST)

Michael J. Ireland; Étienne Artigau; Greg Burley; Michael Edgar; Steve Margheim; Gordon Robertson; John Pazder; Richard McDermid; Ross Zhelem

doi:10.1117/12.2233927

The precision radial velocity error budget for the Gemini High-resolution Optical SpecTrograph (GHOST)

Michael J. Ireland^*, Étienne Artigau, Greg Burley, Michael Edgar, Steve Margheim, Gordon Robertson, John Pazder, Richard McDermid, Ross Zhelem

^*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceeding › Conference Paper › peer-review

10 Citations (Scopus)

Abstract

The Gemini High-resolution Optical SpecTrograph (GHOST) is a fiber fed spectrograph primarily designed for high efficiency and broad wavelength coverage (363 -1000nm), with an anticipated commissioning early in 2018. The primary scientific goal of the Precision Radial Velocity (PRV) mode will be follow-up of relatively faint (R>12) transiting exoplanet targets, especially from the TESS mission. In the PRV mode, the 1.2 arcsec diameter stellar image will be split 19 ways, combined in a single slit with a simultaneous Th/Xe reference source, dispersed at a resolving power of 80,000 and imaged onto two detectors. The spectrograph will be thermally stabilized in the Gemini pier laboratory, and modal noise will be reduced below other sources through the use of a fiber agitator. Unlike other precision high resolution spectrographs, GHOST will not be pressure controlled (although pressure will be monitored precisely), and there will be no double scrambler or shaped (e.g. octagonal) fibers. Instead, GHOST will have to rely on simultaneous two-color imaging of the slit and the simultaneous Th/Xe fiber to correct for variable fiber illumination and focal-ratio degradation. This configuration presents unique challenges in estimating a PRV error budget.

Original language	English
Title of host publication	Ground-Based and Airborne Instrumentation for Astronomy VI
Editors	Luc Simard, Christopher J. Evans, Hideki Takami
Publisher	SPIE
ISBN (Electronic)	9781510601956
DOIs	https://doi.org/10.1117/12.2233927
Publication status	Published - 2016
Event	Ground-Based and Airborne Instrumentation for Astronomy VI - Edinburgh, United Kingdom Duration: 26 Jun 2016 → 30 Jun 2016

Publication series

Name	Proceedings of SPIE - The International Society for Optical Engineering
Volume	9908
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	Ground-Based and Airborne Instrumentation for Astronomy VI
Country/Territory	United Kingdom
City	Edinburgh
Period	26/06/16 → 30/06/16

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10.1117/12.2233927

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Ireland, M. J., Artigau, É., Burley, G., Edgar, M., Margheim, S., Robertson, G., Pazder, J., McDermid, R., & Zhelem, R. (2016). The precision radial velocity error budget for the Gemini High-resolution Optical SpecTrograph (GHOST). In L. Simard, C. J. Evans, & H. Takami (Eds.), Ground-Based and Airborne Instrumentation for Astronomy VI Article 99087A (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9908). SPIE. https://doi.org/10.1117/12.2233927

Ireland, Michael J. ; Artigau, Étienne ; Burley, Greg et al. / The precision radial velocity error budget for the Gemini High-resolution Optical SpecTrograph (GHOST). Ground-Based and Airborne Instrumentation for Astronomy VI. editor / Luc Simard ; Christopher J. Evans ; Hideki Takami. SPIE, 2016. (Proceedings of SPIE - The International Society for Optical Engineering).

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title = "The precision radial velocity error budget for the Gemini High-resolution Optical SpecTrograph (GHOST)",

abstract = "The Gemini High-resolution Optical SpecTrograph (GHOST) is a fiber fed spectrograph primarily designed for high efficiency and broad wavelength coverage (363 -1000nm), with an anticipated commissioning early in 2018. The primary scientific goal of the Precision Radial Velocity (PRV) mode will be follow-up of relatively faint (R>12) transiting exoplanet targets, especially from the TESS mission. In the PRV mode, the 1.2 arcsec diameter stellar image will be split 19 ways, combined in a single slit with a simultaneous Th/Xe reference source, dispersed at a resolving power of 80,000 and imaged onto two detectors. The spectrograph will be thermally stabilized in the Gemini pier laboratory, and modal noise will be reduced below other sources through the use of a fiber agitator. Unlike other precision high resolution spectrographs, GHOST will not be pressure controlled (although pressure will be monitored precisely), and there will be no double scrambler or shaped (e.g. octagonal) fibers. Instead, GHOST will have to rely on simultaneous two-color imaging of the slit and the simultaneous Th/Xe fiber to correct for variable fiber illumination and focal-ratio degradation. This configuration presents unique challenges in estimating a PRV error budget.",

keywords = "Astronomical Spectroscopy, Exoplanets, Precision Radial Velocity",

author = "Ireland, \{Michael J.\} and {\'E}tienne Artigau and Greg Burley and Michael Edgar and Steve Margheim and Gordon Robertson and John Pazder and Richard McDermid and Ross Zhelem",

note = "Publisher Copyright: {\textcopyright} 2016 SPIE.; Ground-Based and Airborne Instrumentation for Astronomy VI ; Conference date: 26-06-2016 Through 30-06-2016",

year = "2016",

doi = "10.1117/12.2233927",

language = "English",

series = "Proceedings of SPIE - The International Society for Optical Engineering",

publisher = "SPIE",

editor = "Luc Simard and Evans, \{Christopher J.\} and Hideki Takami",

booktitle = "Ground-Based and Airborne Instrumentation for Astronomy VI",

address = "United States",

}

Ireland, MJ, Artigau, É, Burley, G, Edgar, M, Margheim, S, Robertson, G, Pazder, J, McDermid, R & Zhelem, R 2016, The precision radial velocity error budget for the Gemini High-resolution Optical SpecTrograph (GHOST). in L Simard, CJ Evans & H Takami (eds), Ground-Based and Airborne Instrumentation for Astronomy VI., 99087A, Proceedings of SPIE - The International Society for Optical Engineering, vol. 9908, SPIE, Ground-Based and Airborne Instrumentation for Astronomy VI, Edinburgh, United Kingdom, 26/06/16. https://doi.org/10.1117/12.2233927

The precision radial velocity error budget for the Gemini High-resolution Optical SpecTrograph (GHOST). / Ireland, Michael J.; Artigau, Étienne; Burley, Greg et al.
Ground-Based and Airborne Instrumentation for Astronomy VI. ed. / Luc Simard; Christopher J. Evans; Hideki Takami. SPIE, 2016. 99087A (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 9908).

Research output: Chapter in Book/Report/Conference proceeding › Conference Paper › peer-review

TY - GEN

T1 - The precision radial velocity error budget for the Gemini High-resolution Optical SpecTrograph (GHOST)

AU - Ireland, Michael J.

AU - Artigau, Étienne

AU - Burley, Greg

AU - Edgar, Michael

AU - Margheim, Steve

AU - Robertson, Gordon

AU - Pazder, John

AU - McDermid, Richard

AU - Zhelem, Ross

PY - 2016

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N2 - The Gemini High-resolution Optical SpecTrograph (GHOST) is a fiber fed spectrograph primarily designed for high efficiency and broad wavelength coverage (363 -1000nm), with an anticipated commissioning early in 2018. The primary scientific goal of the Precision Radial Velocity (PRV) mode will be follow-up of relatively faint (R>12) transiting exoplanet targets, especially from the TESS mission. In the PRV mode, the 1.2 arcsec diameter stellar image will be split 19 ways, combined in a single slit with a simultaneous Th/Xe reference source, dispersed at a resolving power of 80,000 and imaged onto two detectors. The spectrograph will be thermally stabilized in the Gemini pier laboratory, and modal noise will be reduced below other sources through the use of a fiber agitator. Unlike other precision high resolution spectrographs, GHOST will not be pressure controlled (although pressure will be monitored precisely), and there will be no double scrambler or shaped (e.g. octagonal) fibers. Instead, GHOST will have to rely on simultaneous two-color imaging of the slit and the simultaneous Th/Xe fiber to correct for variable fiber illumination and focal-ratio degradation. This configuration presents unique challenges in estimating a PRV error budget.

AB - The Gemini High-resolution Optical SpecTrograph (GHOST) is a fiber fed spectrograph primarily designed for high efficiency and broad wavelength coverage (363 -1000nm), with an anticipated commissioning early in 2018. The primary scientific goal of the Precision Radial Velocity (PRV) mode will be follow-up of relatively faint (R>12) transiting exoplanet targets, especially from the TESS mission. In the PRV mode, the 1.2 arcsec diameter stellar image will be split 19 ways, combined in a single slit with a simultaneous Th/Xe reference source, dispersed at a resolving power of 80,000 and imaged onto two detectors. The spectrograph will be thermally stabilized in the Gemini pier laboratory, and modal noise will be reduced below other sources through the use of a fiber agitator. Unlike other precision high resolution spectrographs, GHOST will not be pressure controlled (although pressure will be monitored precisely), and there will be no double scrambler or shaped (e.g. octagonal) fibers. Instead, GHOST will have to rely on simultaneous two-color imaging of the slit and the simultaneous Th/Xe fiber to correct for variable fiber illumination and focal-ratio degradation. This configuration presents unique challenges in estimating a PRV error budget.

KW - Astronomical Spectroscopy

KW - Exoplanets

KW - Precision Radial Velocity

UR - https://www.scopus.com/pages/publications/85007189880

U2 - 10.1117/12.2233927

DO - 10.1117/12.2233927

M3 - Conference Paper

T3 - Proceedings of SPIE - The International Society for Optical Engineering

BT - Ground-Based and Airborne Instrumentation for Astronomy VI

A2 - Simard, Luc

A2 - Evans, Christopher J.

A2 - Takami, Hideki

PB - SPIE

T2 - Ground-Based and Airborne Instrumentation for Astronomy VI

Y2 - 26 June 2016 through 30 June 2016

ER -

Ireland MJ, Artigau É, Burley G, Edgar M, Margheim S, Robertson G et al. The precision radial velocity error budget for the Gemini High-resolution Optical SpecTrograph (GHOST). In Simard L, Evans CJ, Takami H, editors, Ground-Based and Airborne Instrumentation for Astronomy VI. SPIE. 2016. 99087A. (Proceedings of SPIE - The International Society for Optical Engineering). doi: 10.1117/12.2233927

The precision radial velocity error budget for the Gemini High-resolution Optical SpecTrograph (GHOST)

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