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Montes Gutiérrez, David and otros, ... (2006) The first extrasolar planet discovered with a new-generation high-throughput Doppler instrument. Astrophysical journal, 648 (1). pp. 683-695. ISSN 0004-637X
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Official URL: http://dx.doi.org/10.1086/505699
Abstract
We report the detection of the first extrasolar planet, ET-1 (HD 102195b), using the Exoplanet Tracker (ET), a new-generation Doppler instrument. The planet orbits HD 102195, a young star with solar metallicity that may be part of the local association. The planet imparts radial velocity variability to the star with a semiamplitude of 63.4 ± 2.0 m s^-1 and a period of 4.11 days. The planetary minimum mass (m sin i) is 0.488MJ ± 0.015M_J. The planet was initially detected in the spring of 2005 with the Kitt Peak National Observatory (KPNO) 0.9 m coudé feed telescope. The detection was confirmed by radial velocity observations with the ET at the KPNO 2.1 m telescope and also at the 9 m Hobby-Eberly Telescope (HET) with its High Resolution Spectrograph. This planetary discovery with a 0.9 m telescope around a V = 8.05 magnitude star was made possible by the high throughput of the instrument: 49% measured from the fiber output to the detector. The ET's interferometer-based approach is an effective method for planet detection. In addition, the ET concept is adaptable to multiple-object Doppler observations or very high precision observations with a cross-dispersed echelle spectrograph to separate stellar fringes over a broad wavelength band. In addition to spectroscopic observations of HD 102195, we obtained brightness measurements with one of the automated photometric telescopes at Fairborn Observatory. Those observations reveal that HD 102195 is a spotted variable star with an amplitude of ~0.015 mag and a 12.3 ± 0.3 day period. This is consistent with spectroscopically observed Ca II H and K emission levels and line-broadening measurements but inconsistent with rotational modulation of surface activity as the cause of the radial velocity variability. Our photometric observations rule out transits of the planetary companion.
Item Type: | Article |
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Additional Information: | © 2006. The American Astronomical Society. |
Uncontrolled Keywords: | Externally dispersed interferometer; Fixed-delay interferometer; Lower main-sequence; Digital sky survey; Solar-type stars; Sun-like stars; CA-II H; Lithium abundances; Radial velocimetry; N2K consortium |
Subjects: | Sciences > Physics > Astrophysics Sciences > Physics > Astronomy |
ID Code: | 37860 |
Deposited On: | 25 May 2016 13:13 |
Last Modified: | 10 Dec 2018 15:05 |
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