Low-mass companions to Hyades stars

E. W. Guenther, D. B. Paulson, W. D. Cochran, Jennifer Patience, A. P. Hatzes, B. Macintosh

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

It is now well established that a large fraction of the low-mass stars are binaries or higher order multiples. Similarly a sizable fraction have giant planets. In contrast to these, the situation for brown dwarf companions is complicated: While close systems seem to be extremely rare, wide systems are possibly more common. In this paper, we present new results on a survey for low-mass companions in the Hyades. After measuring precisely the radial velocity of 98 Hyades dwarf stars for 5 years, we have selected all stars that show low-amplitude long-period trends. With AO-observations of these 14 stars we found companion candidates around nine of them, where one star has two companions. The two companions of HIP 16548 have masses between 0.07 to 0.08 M, and are thus either brown dwarfs or very low mass stars. In the case of HAN 172 we found a companion with a mass between 0.08 to 0.10 M , which is again between a star and a brown dwarf. The other seven stars all have stellar companions. In two additional cases, the RV-variations are presumably caused by stellar activity, and in another case the companion could be a short-period binary. The images of the remaining two stars are slightly elongated, which might imply that even these are binaries. Because at least 12 of the 14 stars showing low-amplitude RV trends turn out to have companions with a mass ≥ 70 MJupiter, or are just active, we finally estimate the number of companions with masses between 10 M Jupiter and 70 MJupiter within 8 AU of the host stars in the Hyades as ≤2%.

Original languageEnglish (US)
Pages (from-to)1031-1039
Number of pages9
JournalAstronomy and Astrophysics
Volume442
Issue number3
DOIs
StatePublished - Nov 2005
Externally publishedYes

Fingerprint

stars
stellar activity
trends
dwarf stars
hot isostatic pressing
Jupiter
binary stars
planet
Jupiter (planet)
radial velocity
planets
estimates
trend

Keywords

  • Stars: binaries: spectroscopic
  • Stars: binaries: visual
  • Stars: low-mass, brown dwarfs
  • Stars: planetary systems

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Guenther, E. W., Paulson, D. B., Cochran, W. D., Patience, J., Hatzes, A. P., & Macintosh, B. (2005). Low-mass companions to Hyades stars. Astronomy and Astrophysics, 442(3), 1031-1039. https://doi.org/10.1051/0004-6361:20052851

Low-mass companions to Hyades stars. / Guenther, E. W.; Paulson, D. B.; Cochran, W. D.; Patience, Jennifer; Hatzes, A. P.; Macintosh, B.

In: Astronomy and Astrophysics, Vol. 442, No. 3, 11.2005, p. 1031-1039.

Research output: Contribution to journalArticle

Guenther, EW, Paulson, DB, Cochran, WD, Patience, J, Hatzes, AP & Macintosh, B 2005, 'Low-mass companions to Hyades stars', Astronomy and Astrophysics, vol. 442, no. 3, pp. 1031-1039. https://doi.org/10.1051/0004-6361:20052851
Guenther EW, Paulson DB, Cochran WD, Patience J, Hatzes AP, Macintosh B. Low-mass companions to Hyades stars. Astronomy and Astrophysics. 2005 Nov;442(3):1031-1039. https://doi.org/10.1051/0004-6361:20052851
Guenther, E. W. ; Paulson, D. B. ; Cochran, W. D. ; Patience, Jennifer ; Hatzes, A. P. ; Macintosh, B. / Low-mass companions to Hyades stars. In: Astronomy and Astrophysics. 2005 ; Vol. 442, No. 3. pp. 1031-1039.
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