A stellar companion in the HP 189733 system with a known transiting extrasolar planet

Gáspár Á Bakos; András Pál; David W. Latham; Robert W. Noyes; Robert P. Stefanik

doi:10.1086/503671

A stellar companion in the HP 189733 system with a known transiting extrasolar planet

Gáspár Á Bakos, András Pál, David W. Latham, Robert W. Noyes, Robert P. Stefanik

Research output: Contribution to journal › Article › peer-review

57 Scopus citations

Abstract

We show that the very close-by (19 pc) K0 star HD 189733, already found to be orbited by a transiting giant planet, is the primary of a double star system, with the secondary being a mid-M dwarf with projected separation of about 216 AU from the primary. This conclusion is based on astrometry, proper-motion and radial velocity measurements, spectral type determination, and photometry. We also detect differential proper motion of the secondary. The data appear consistent with the secondary's orbiting the primary in a clockwise orbit, lying nearly in the plane of the sky (i.e., nearly perpendicular to the orbital plane of the transiting planet), and with period of about 3200 years.

Original language	English (US)
Pages (from-to)	L57-L60
Journal	Astrophysical Journal
Volume	641
Issue number	1 II
DOIs	https://doi.org/10.1086/503671
State	Published - Apr 10 2006
Externally published	Yes

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

Binaries: close
Planetary systems
Stars: individual (HD 189733, HD 189733B)
Stars: low-mass, brown dwarfs

Access to Document

10.1086/503671

Cite this

@article{71604cff012541e7aa112228eb7754a8,

title = "A stellar companion in the HP 189733 system with a known transiting extrasolar planet",

abstract = "We show that the very close-by (19 pc) K0 star HD 189733, already found to be orbited by a transiting giant planet, is the primary of a double star system, with the secondary being a mid-M dwarf with projected separation of about 216 AU from the primary. This conclusion is based on astrometry, proper-motion and radial velocity measurements, spectral type determination, and photometry. We also detect differential proper motion of the secondary. The data appear consistent with the secondary's orbiting the primary in a clockwise orbit, lying nearly in the plane of the sky (i.e., nearly perpendicular to the orbital plane of the transiting planet), and with period of about 3200 years.",

keywords = "Binaries: close, Planetary systems, Stars: individual (HD 189733, HD 189733B), Stars: low-mass, brown dwarfs",

author = "Bakos, {G{\'a}sp{\'a}r {\'A}} and Andr{\'a}s P{\'a}l and Latham, {David W.} and Noyes, {Robert W.} and Stefanik, {Robert P.}",

note = "Funding Information: This work was funded by NASA grant NNG04GN74G. Work by G. {\'A}. B. was supported by NASA through Hubble Fellowship grant HST-HF-01170.01-A. A. P. wishes to acknowledge the hospitality of the CfA, where part of this work was carried out. The work of A. P. was also supported by Hungarian OTKA grant T-038437. D. W. L. and R. P. S. thank the Kepler mission for support through NASA cooperative agreement NCC 2-1390. We acknowledge the use of the 2MASS survey frames and the POSS scans. We thank Perry Berlind at FLWO for taking the FAST spectra of HD 189733B, and Emilio Falco for the follow-up exposures using the 1.2 m telescope.",

year = "2006",

month = apr,

day = "10",

doi = "10.1086/503671",

language = "English (US)",

volume = "641",

pages = "L57--L60",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

number = "1 II",

}

TY - JOUR

T1 - A stellar companion in the HP 189733 system with a known transiting extrasolar planet

AU - Bakos, Gáspár Á

AU - Pál, András

AU - Latham, David W.

AU - Noyes, Robert W.

AU - Stefanik, Robert P.

N1 - Funding Information: This work was funded by NASA grant NNG04GN74G. Work by G. Á. B. was supported by NASA through Hubble Fellowship grant HST-HF-01170.01-A. A. P. wishes to acknowledge the hospitality of the CfA, where part of this work was carried out. The work of A. P. was also supported by Hungarian OTKA grant T-038437. D. W. L. and R. P. S. thank the Kepler mission for support through NASA cooperative agreement NCC 2-1390. We acknowledge the use of the 2MASS survey frames and the POSS scans. We thank Perry Berlind at FLWO for taking the FAST spectra of HD 189733B, and Emilio Falco for the follow-up exposures using the 1.2 m telescope.

PY - 2006/4/10

Y1 - 2006/4/10

N2 - We show that the very close-by (19 pc) K0 star HD 189733, already found to be orbited by a transiting giant planet, is the primary of a double star system, with the secondary being a mid-M dwarf with projected separation of about 216 AU from the primary. This conclusion is based on astrometry, proper-motion and radial velocity measurements, spectral type determination, and photometry. We also detect differential proper motion of the secondary. The data appear consistent with the secondary's orbiting the primary in a clockwise orbit, lying nearly in the plane of the sky (i.e., nearly perpendicular to the orbital plane of the transiting planet), and with period of about 3200 years.

AB - We show that the very close-by (19 pc) K0 star HD 189733, already found to be orbited by a transiting giant planet, is the primary of a double star system, with the secondary being a mid-M dwarf with projected separation of about 216 AU from the primary. This conclusion is based on astrometry, proper-motion and radial velocity measurements, spectral type determination, and photometry. We also detect differential proper motion of the secondary. The data appear consistent with the secondary's orbiting the primary in a clockwise orbit, lying nearly in the plane of the sky (i.e., nearly perpendicular to the orbital plane of the transiting planet), and with period of about 3200 years.

KW - Binaries: close

KW - Planetary systems

KW - Stars: individual (HD 189733, HD 189733B)

KW - Stars: low-mass, brown dwarfs

UR - http://www.scopus.com/inward/record.url?scp=33745295500&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33745295500&partnerID=8YFLogxK

U2 - 10.1086/503671

DO - 10.1086/503671

M3 - Article

AN - SCOPUS:33745295500

SN - 0004-637X

VL - 641

SP - L57-L60

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 II

ER -

A stellar companion in the HP 189733 system with a known transiting extrasolar planet

Abstract

All Science Journal Classification (ASJC) codes

Keywords

Access to Document

Other files and links

Fingerprint

Cite this