Measuring Stellar Radial Velocities with a Dispersed Fixed‐Delay Interferometer
| Autor: | Jian Ge, Scott W. Fleming, Julian C. van Eyken, Roger Cohen, Justin Crepp, Curtis DeWitt, Suvrath Mahadevan, Andrew Vanden Heuvel |
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| Rok vydání: | 2008 |
| Předmět: |
Physics
Stellar kinematics Milky Way Astrophysics (astro-ph) Astrophysics::Instrumentation and Methods for Astrophysics Brown dwarf FOS: Physical sciences Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Exoplanet Radial velocity Stars Interferometry Space and Planetary Science Astrophysics::Solar and Stellar Astrophysics Astrophysics::Earth and Planetary Astrophysics Spectral resolution Astrophysics::Galaxy Astrophysics |
| Zdroj: | The Astrophysical Journal. 678:1505-1510 |
| ISSN: | 1538-4357 0004-637X |
| DOI: | 10.1086/533514 |
| Popis: | We demonstrate the ability to measure precise stellar barycentric radial velocities with the dispersed fixed-delay interferometer technique using the Exoplanet Tracker (ET), an instrument primarily designed for precision differential Doppler velocity measurements using this technique. Our barycentric radial velocities, derived from observations taken at the KPNO 2.1 meter telescope, differ from those of Nidever et al. by 0.047 km/s (rms) when simultaneous iodine calibration is used, and by 0.120 km/s (rms) without simultaneous iodine calibration. Our results effectively show that a Michelson interferometer coupled to a spectrograph allows precise measurements of barycentric radial velocities even at a modest spectral resolution of R ~ 5100. A multi-object version of the ET instrument capable of observing ~500 stars per night is being used at the Sloan 2.5 m telescope at Apache Point Observatory for the Multi-object APO Radial Velocity Exoplanet Large-area Survey (MARVELS), a wide-field radial velocity survey for extrasolar planets around TYCHO-2 stars in the magnitude range 7.6 Comment: 9 pages, 4 figures. Accepted for publication in ApJ |
| Databáze: | OpenAIRE |
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