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The First Extrasolar Planet Discovered with a New-Generation High-Throughput Doppler Instrument
We report the detection of the first extrasolar planet, ET-1 (HD102195b), using the Exoplanet Tracker (ET), a new-generation Dopplerinstrument. The planet orbits HD 102195, a young star with solarmetallicity that may be part of the local association. The planetimparts radial velocity variability to the star with a semiamplitude of63.4+/-2.0 m s-1 and a period of 4.11 days. The planetaryminimum mass (msini) is 0.488MJ+/-0.015MJ. Theplanet was initially detected in the spring of 2005 with the Kitt PeakNational Observatory (KPNO) 0.9 m coudé feed telescope. Thedetection was confirmed by radial velocity observations with the ET atthe KPNO 2.1 m telescope and also at the 9 m Hobby-Eberly Telescope(HET) with its High Resolution Spectrograph. This planetary discoverywith a 0.9 m telescope around a V=8.05 magnitude star was made possibleby the high throughput of the instrument: 49% measured from the fiberoutput to the detector. The ET's interferometer-based approach is aneffective method for planet detection. In addition, the ET concept isadaptable to multiple-object Doppler observations or very high precisionobservations with a cross-dispersed echelle spectrograph to separatestellar fringes over a broad wavelength band. In addition tospectroscopic observations of HD 102195, we obtained brightnessmeasurements with one of the automated photometric telescopes atFairborn Observatory. Those observations reveal that HD 102195 is aspotted variable star with an amplitude of ~0.015 mag and a 12.3+/-0.3day period. This is consistent with spectroscopically observed Ca II Hand K emission levels and line-broadening measurements but inconsistentwith rotational modulation of surface activity as the cause of theradial velocity variability. Our photometric observations rule outtransits of the planetary companion.
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