Long-lived, long-period radial velocity variations in Aldebaran: A planetary companion and stellar activity
@article{Hatzes2015LonglivedLR, title={Long-lived, long-period radial velocity variations in Aldebaran: A planetary companion and stellar activity}, author={A. P. Hatzes and William D. Cochran and Michael Endl and E. W. Guenther and Phillip J. MacQueen and Michael Hartmann and Mathias Zechmeister and Inwoo Han and B.-C. Lee and G. A. H. Walker and S. Yang and Ana M. Larson and K.-M. Kim and David Mkrtichian and M. Doellinger and Attila E. Simon and L. Girardi}, journal={arXiv: Solar and Stellar Astrophysics}, year={2015} }
We investigate the nature of the long-period radial velocity variations in Alpha Tau first reported over 20 years ago. We analyzed precise stellar radial velocity measurements for Alpha Tau spanning over 30 years. An examination of the Halpha and Ca II 8662 spectral lines, and Hipparcos photometry was also done to help discern the nature of the long-period radial velocity variations. Our radial velocity data show that the long-period, low amplitude radial velocity variations are long-lived and…
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References
SHOWING 1-10 OF 37 REFERENCES
Confirmation of the planet hypothesis for the long-period radial velocity variations of β Geminorum
- Physics, Geology
- 2006
Aims. Our aim is to confirm the nature of the long period radial velocity measurements for β Gem first found by Hatzes & Cochran (1993). Methods. We present precise stellar radial velocity…
Discovery of a planet around the K giant star 4 Ursae Majoris
- Physics, Geology
- 2007
For the past 3 years we have been monitoring a sample of 62 K giant stars using precise stellar radial velocity measurements with high accuracy taken at the Thuringer Landessternwarte Tautenburg. We…
Precise radial velocities with BOES : Detection of low-amplitude pulsations in the K-giant α arietis
- Physics
- 2006
We present the first results from a high-precision radial velocity study of the K2 III giant star α Ari. Observations were acquired over 6 nights in 2004 using the new high-resolution spectrograph…
No planet for HD 166435
- Physics, Geology
- 2001
The G0 V star HD 166435 has been observed by the ber-fed spectrograph ELODIE as one of the targets in the large extra-solar planet survey that we are conducting at the Observatory of Haute-Provence.…
Precise radial velocities of giant stars. II. Pollux and its planetary companion
- Physics, Geology
- 2006
It has long been speculated that the observed periodic radial velocity pattern for the K giant Pollux might be explained in terms of an orbiting planetary companion. We have collected 80…
ON THE NATURE OF THE RADIAL VELOCITY VARIABILITY OF ALDEBARAN : A SEARCH FOR SPECTRAL LINE BISECTOR VARIATIONS
- Physics
- 1998
The shape of the Ti i 6303.8-A spectral line of Aldebaran as measured by the line bisector was investigated using high signal-to-noise ratio, high-resolution data. The goal of this study was to…
A low-amplitude periodicity in the radial velocity and chromospheric emission of beta Geminorum
- Physics, Geology
- 1993
Using high-quality spectra obtained with the hydrogren fluoride technique at the Canada-France-Hawaii 3.6-meter telescope and Dominion Astrophysical Observatory 1.22-meter telescope, we have detected…
Long-Period Radial Velocity Variations in Three K Giants
- Physics, Geology
- 1993
Precise relative radial velocities (σ∼20 m s −1 ) are presented for three K giants: α Tau, α Boo, and β Gem. The data reveal periods of 233 days for α Boo, 643 days for α Tau, and 558 days for β Gem.…
A giant planet around the massive giant star HD 13189
- Physics, Geology
- 2005
Most extrasolar planet discoveries using radial velocity measurements have been for solar-like G-stars. In order to understand better the role stellar mass for the formation of planets we must learn…
THE DISCOVERY OF A PLANETARY COMPANION TO 16 CYGNI B
- Physics, Geology
- 1996
High-precision radial-velocity observations of the solar-type star 16 Cygni B (HR 7504, HD 186427), taken at McDonald Observatory and at Lick Observatory, have each independently discovered periodic…