Radial-velocity orbits for three southern spectroscopic binaries

Salzer, John J.; Beavers, W. I.

doi:10.1086/131578

Cited by 2 publications

(6 citation statements)

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“…HD 188981 is a known spectroscopic binary (Salzer & Beavers 1985;Pourbaix et al 2004) that escaped the elimination of binaries in our initial target selection process. Our iodine-cell velocity data have resulted in an extremely precise orbital solution for this system (Table 10 and Fig.…”

Section: Four Stellar-mass Companionsmentioning

confidence: 99%

“…We obtain m sin i = 220.9 M Jup (=0.211 M ). Salzer & Beavers (1985) remarked that the host star is ∼0.1 mag bluer than expected for a solitary K1 giant, and postulated that the stellar companion was an F-type dwarf. An F dwarf companion of 1.2 M would require a binary orbital inclination of only i ∼ 10…”

Section: Four Stellar-mass Companionsmentioning

confidence: 99%

“…While the spectral lines from such a star would have remained hidden in the data of Salzer & Beavers (1985), the higher resolution and S/N of the AAT data should have produced a double-lined spectrum, which would have caused the planet-search Doppler analysis to fail as for those stars in Table 1. We simulated the effect of a second light at various levels of contamination.…”

Section: Four Stellar-mass Companionsmentioning

confidence: 99%

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The Pan-Pacific Planet Search III: five companions orbiting giant stars

Wittenmyer

Butler

Wang

et al. 2015

Monthly Notices of the Royal Astronomical Society

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We report a new giant planet orbiting the K giant HD 155233, as well as four stellar-mass companions from the Pan-Pacific Planet Search, a Southern hemisphere radial velocity survey for planets orbiting nearby giants and sub-giants. We also present updated velocities and a refined orbit for HD 47205b (7 CMa b), the first planet discovered by this survey. HD 155233b has a period of 885 ± 63 d, eccentricity e = 0.03 ± 0.20, and m sin i = 2.0 ± 0.5 M Jup . The stellar-mass companions range in m sin i from 0.066 to 0.33 M . Whilst HD 104358B falls slightly below the traditional 0.08 M hydrogen-burning mass limit, and is hence a browndwarf candidate, we estimate only a 50 per cent a priori probability of a truly sub-stellar mass.Key words: techniques: radial velocities -planetary systems -planets and satellites: detection. I N T RO D U C T I O NRadial velocity planet search efforts have been underway for more than 20 yr, discovering hundreds of new planetary companions. However, brown-dwarf and stellar-mass companions tend to be largely ignored in these surveys: limited telescope time means that targets showing large amplitude variations ( 500 m s −1 ) are usually dropped from the observing queue. Only limited results on such massive companions have been published (Patel et al. 2007), with many objects featuring incomplete orbits. However, such objects remain valuable for exploring the lower end of the mass function and the properties of stellar systems in the Solar neighbourhood. The observed deficit of companions between 13 and 80 M Jup is known as the 'brown-dwarf desert' (Marcy & Butler 2000;Mazeh et al. 2003), and became evident in the earliest days of radial velocity planet searches (Campbell, Walker & Yang 1988;Murdoch, Hearnshaw & Clark 1993). A comprehensive, self-consistent study by Grether & Lineweaver (2006) confirmed the presence of a 'valley' in the brown-dwarf mass range at M = 31 +25 −18 M Jup . Stellar companions are also not to be ignored, since any binary system with a well-characterized orbit is useful for a range of follow-up science. Most obviously, a precisely determined binary orbit permits the search for E-mail: rob@phys.unsw.edu.au additional Doppler velocity signals due to planets orbiting one or both stars. Binary systems compose ∼50 per cent of nearby star systems (Duquennoy & Mayor 1991;Raghavan et al. 2010), yet are hosts to only ∼5 per cent of known extrasolar planets. The mechanisms and outcomes of planet formation in close binary systems remain significant questions virtually unexplored by observations.At the 3.9 m Anglo-Australian Telescope (AAT), we carried out a five-year survey for planets orbiting intermediate-mass evolved stars in an effort to characterize the dependence of planetary system properties on stellar mass Reffert et al. 2015). The initial sample was selected according to these criteria: 1.0 < (B − V) < 1.2, 1.8 < M V < 3.0, and V < 8.0. Of those stars meeting these criteria, 18 were discarded as binaries by their Hipparcos multiple systems flag. From the 167...

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Section: Four Stellar-mass Companionsmentioning

confidence: 99%

Section: Four Stellar-mass Companionsmentioning

confidence: 99%

Section: Four Stellar-mass Companionsmentioning

confidence: 99%

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The Pan-Pacific Planet Search III: five companions orbiting giant stars

Wittenmyer

Butler

Wang

et al. 2015

Monthly Notices of the Royal Astronomical Society

View full text Add to dashboard Cite

show abstract

Section: Four Stellar-mass Companionsmentioning

confidence: 99%

“…We obtain m sin i=220.9 MJup (= 0.211 M⊙). Salzer & Beavers (1985) remarked that the host star is ∼0.1 mag bluer than expected for a solitary K1 giant, and postulated that the stellar companion was an F-type dwarf. An F dwarf companion of 1.2 M⊙ would require a binary orbital inclination of only i ∼10 o .…”

Section: Four Stellar-mass Companionsmentioning

confidence: 99%

The Pan-Pacific Planet Search III: Five companions orbiting giant stars

Wittenmyer,

Butler,

Wang

et al. 2015

Preprint

View full text Add to dashboard Cite

We report a new giant planet orbiting the K giant HD 155233, as well as four stellar-mass companions from the Pan-Pacific Planet Search, a southern hemisphere radial velocity survey for planets orbiting nearby giants and subgiants. We also present updated velocities and a refined orbit for HD 47205b (7 CMa b), the first planet discovered by this survey. HD 155233b has a period of 885±63 days, eccentricity e = 0.03±0.20, and m sin i=2.0±0.5 M Jup . The stellar-mass companions range in m sin i from 0.066 M ⊙ to 0.33 M ⊙ . Whilst HD 104358B falls slightly below the traditional 0.08 M ⊙ hydrogen-burning mass limit, and is hence a brown dwarf candidate, we estimate only a 50% a priori probability of a truly substellar mass.

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Radial-velocity orbits for three southern spectroscopic binaries

Cited by 2 publications

References 8 publications

The Pan-Pacific Planet Search III: five companions orbiting giant stars

The Pan-Pacific Planet Search III: five companions orbiting giant stars

The Pan-Pacific Planet Search III: Five companions orbiting giant stars

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