有哪些信誉好的足球投注网站Direct detection of exoplanet host star companion gamma Cep B and revised masses for both s.pdf
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Direct detection of exoplanet host star companion gamma Cep B and revised masses for both s
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Astronomy Astrophysics manuscript no. 6581 c? ESO 2008
February 4, 2008
Direct detection of exoplanet host star companion γ Cep B and
revised masses for both stars and the sub-stellar object
Ralph Neuha?user
1
, Markus Mugrauer
1
, Misato Fukagawa
2,3
, Guillermo Torres
4
, and Tobias Schmidt
1
1
Astrophysikalisches Institut, Universita?t Jena, Schillerga?sschen 2-3, 07745 Jena, Germany
2
Spitzer Science Center, California Institute of Technology, Pasadena, CA 91125, USA
3
Division of Particle and Astrophysical Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
4
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
Received 17 Oct 2006; accepted 27 Oct 2006
ABSTRACT
Context. The star γ Cep is known as a single-lined spectroscopic triple system at a distance of 13.8 pc, composed of a K1 III-IV primary star
with V = 3.2 mag, a stellar-mass companion in a 66–67 year orbit (Torres 2006), and a substellar companion with Mp sin i = 1.7 MJup that is
most likely a planet (Hatzes et al. 2003).
Aims. We aim to obtain a first direct detection of the stellar companion, to determine its current orbital position (for comparison with the
spectroscopic and astrometric data), its infrared magnitude and, hence, mass.
Methods. We use the Adaptive Optics camera CIAO at the Japanese 8m telescope Subaru on Mauna Kea, Hawaii, with the semi-transparent
coronograph to block most of the light from the bright primary γ Cep A, and to detect at the same time the faint companion B. In addition, we
also used the IR camera ? Cass at the Calar Alto 3.5m telescope, Spain, to image γ Cep A and B by adding up many very short integrations
(without AO).
Results. γ Cep B is clearly detected on our CIAO and ? Cass images. We use a photometric standard star to determine the magnitude of B
after PSF subtraction in the Subaru image, and the magnitude difference between A and B in
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