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Can surface oxygen abundances of red giants be explained by the canonical mixing theory?
Yoichi Takeda, Bun'ei Sato, Masashi Omiya +1
Extensive oxygen abundance determinations were carried out for 239 late-G/early-K giant stars of 1.5-5 M_sun by applying the spectrum-fitting technique to O I 7771-5 and [O I] 6300…
Global Analysis of KOI-977: Spectroscopy, Asteroseismology, and Phase-curve Analysis
Teruyuki Hirano, Kento Masuda, Bun'ei Sato +5
We present a global analysis of KOI-977, one of the planet host candidates detected by {\it Kepler}. Kepler Input Catalog (KIC) reports that KOI-977 is a red giant, for which few c…
Solar rotation inferred from radial velocities of the sun-as-a-star during the 2012 May 21 eclipse
Yoichi Takeda, Osamu Ohshima, Eiji Kambe +6
With an aim to examine how much information of solar rotation can be obtained purely spectroscopically by observing the sun-as-a-star during the 2012 May 21 eclipse at Okayama Astr…
A Long-period Eccentric Substellar Companion to the Evovled Intermediate-Mass Star HD 14067
Liang Wang, Bunei Sato, Masashi Omiya +14
We report the detection of a substellar companion orbiting an evolved intermediate-mass () star HD 14067 (G9 III) using precise Doppler technique. Radial velo…
Detection of solar-like oscillations in the bright red giant stars Psc and Tau from a 190-day high-precision spectroscopic multisite campaign
P. G. Beck, E. Kambe, M. Hillen +35
Red giants are evolved stars which exhibit solar-like oscillations. Although a multitude of stars have been observed with space telescopes, only a handful of red-giant stars were t…
The Transiting Exoplanet Survey Satellite
George R. Ricker, Joshua N. Winn, Roland Vanderspek +55
The Transiting Exoplanet Survey Satellite (TESS) will search for planets transiting bright and nearby stars. TESS has been selected by NASA for launch in 2017 as an Astrophysics Ex…