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Cited by 492

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A Planetary Companion to 70 Virginis

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Marcy, Geoffrey W., Butler, R. Paul·1996·The Astrophysical Journal

Abstract

An extremely low mass companion to the solar-type star 70 Virginis is inferred from the observed periodic Doppler reflex motion of the primary during 8 yr. The minimum mass ( M 2 sin i ) of 70 Vir "B" is 6.6 Jovian masses ( M J ), which falls in the mass range associated with "extrasolar giant planets" (0.3-15 M J ). An orbital fit to the velocities yields a period P = 116.6 days, an amplitude K = 318 m s -1 , and an eccentricity e = 0.40. The residuals to the fit scatter by 8 m s -1 , consistent with the errors. Thus 70 Vir B and 51 Peg B represent the first planets found outside our solar system. Alternatively, the probability that 70 Vir B is an orbiting brown dwarf of mass M > 40 M J is ~1%, requiring an extreme (face-on) orbital inclination of i < 9°. With a likely mass of 6.6-9 M J , 70 Vir B lies in the nebulously defined domain between solar system planets and brown dwarfs. Its effective temperature is computed to be ~90°C. The formation of such giant planets in eccentric orbits is not explained by current theory.

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Metadata

Authors
Marcy, G. W., & Butler, R. P.
Venue
The Astrophysical Journal
Published
1996-06-20
Volume
464
Issue
2
Pages
L147-L151
ISSN
0004-637X (ISSN-L)
OpenAlex
W1987488212
Cited by
492
References
1
FWCI
44.97
Type
journal article
Language
en
Open access
bronze

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CoChat. (2026). Citation check: A Planetary Companion to 70 Virginis. https://app.cochat.ai/papers/10.1086/310096
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Marcy, G. W., & Butler, R. P. (1996). A Planetary Companion to 70 Virginis. The Astrophysical Journal. https://doi.org/10.1086/310096

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