A radial velocity spectrometer for the Automated Planet Finder Telescope at Lick Observatory

Radovan, Matthew V.; Cabak, Gerald; Laiterman, Lee; Lockwood, Chris; Vogt, Steven S.

doi:10.1117/12.857726

Cited by 15 publications

(14 citation statements)

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“…Two different data analysis pipelines have been tested at HARPS-N; this was a useful exercise that helped to identify new areas for improving the RV precision. Radovan et al 2010;Vogt et al 2014) is located at Lick Observatory 62 and the Levy spectrograph was commissioned at the APF in 2013. The instrument uses a narrow slit to reach resolutions up to 150,000.…”

Section: Presentations By David Phillips and Lars Buchhavementioning

confidence: 99%

State of the Field: Extreme Precision Radial Velocities

Fischer

Anglada‐Escudé

Arriagada³

et al. 2016

PASP

308

254

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The Second Workshop on Extreme Precision Radial Velocities defined circa 2015 the state of the art Doppler precision and identified the critical path challenges for reaching 10 cm s −1 measurement precision. The presentations and discussion of key issues for instrumentation and data analysis and the workshop recommendations for achieving this bold precision are summarized here.Beginning with the HARPS spectrograph, technological advances for precision radial velocity measurements have focused on building extremely stable instruments. To reach still higher precision, future spectrometers will need to improve upon the state of the art, producing even higher fidelity spectra. This should be possible with improved environmental control, greater stability in the illumination of the spectrometer optics, better detectors, more precise wavelength calibration, and broader bandwidth spectra. Key data analysis challenges for the precision radial velocity community include distinguishing center of mass Keplerian motion from photospheric velocities (time correlated noise) and the proper treatment of telluric contamination. Success here is coupled to the instrument design, but also requires the implementation of robust statistical and modeling techniques. Center of mass velocities produce Doppler shifts that affect every line identically, while photospheric velocities produce line profile asymmetries with wavelength and temporal dependencies that are different from Keplerian signals.Exoplanets are an important subfield of astronomy and there has been an impressive rate of discovery over the past two decades. However, higher precision radial velocity measurements are required to serve as a discovery technique for potentially habitable worlds, to confirm and characterize detections from transit missions, and to provide mass measurements for other space-based missions. The future of exoplanet science has very different trajectories depending on the precision that can ultimately be achieved with Doppler measurements.

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Section: Presentations By David Phillips and Lars Buchhavementioning

confidence: 99%

State of the Field: Extreme Precision Radial Velocities

Fischer

Anglada‐Escudé

Arriagada³

et al. 2016

PASP

308

254

View full text Add to dashboard Cite

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“…The APF telescope is equipped with the Levy Spectrograph, which is a high-resolution slit-fed optical echelle spectrometer (Radovan et al 2010). APF-Levy observed HD332231 using the W decker, which has a width of 1″ in the spectral dimension and 3″ in the spatial dimension.…”

Section: Apf-levymentioning

confidence: 99%

The TESS–Keck Survey. I. A Warm Sub-Saturn-mass Planet and a Caution about Stray Light in TESS Cameras*

Dalba

Gupta

Rodriguez

et al. 2020

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“…For example, its Levy spectrometer, a highresolution prism cross-dispersed echelle spectrograph with a maximum spectral resolving power of R ∼ 150;000, is optimized for high precision RV planet detection. 2,4 A full description of the design and the individual components of the APF is available in Ref. 2.…”

mentioning

confidence: 99%

Capabilities and performance of the Automated Planet Finder telescope with the implementation of a dynamic scheduler

Burt

Holden

Hanson

et al. 2015

J. Astron. Telesc. Instrum. Syst

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Abstract. We report initial performance results emerging from 600 h of observations with the Automated Planet Finder (APF) telescope and Levy spectrometer located at UCO/Lick Observatory. We have obtained multiple spectra of 80 G, K, and M-type stars, which comprise 4954 individual Doppler radial velocity (RV) measurements with a median internal uncertainty of 1.35 ms −1 . We find a strong, expected correlation between the number of photons accumulated in the 5000 to 6200 Å iodine region of the spectrum and the resulting internal uncertainty estimates. Additionally, we find an offset between the population of G and K stars and the M stars within the dataset when comparing these parameters. As a consequence of their increased spectral line densities, M-type stars permit the same level of internal uncertainty with 2× fewer photons than G-type and K-type stars. When observing M stars, we show that the APF/Levy has essentially the same speed-on-sky as Keck/high resolution echelle spectrometer (HIRES) for precision RVs. In the interest of using the APF for long-duration RV surveys, we have designed and implemented a dynamic scheduling algorithm. We discuss the operation of the scheduler, which monitors ambient conditions and combines on-sky information with a database of survey targets to make intelligent, real-time targeting decisions.

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A radial velocity spectrometer for the Automated Planet Finder Telescope at Lick Observatory

Cited by 15 publications

References 0 publications

State of the Field: Extreme Precision Radial Velocities

State of the Field: Extreme Precision Radial Velocities

The TESS–Keck Survey. I. A Warm Sub-Saturn-mass Planet and a Caution about Stray Light in TESS Cameras*

Capabilities and performance of the Automated Planet Finder telescope with the implementation of a dynamic scheduler

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