14 research outputs found
Two Exoplanets Discovered at Keck Observatory
We present two exoplanets detected at Keck Observatory. HD 179079 is a G5
subgiant that hosts a hot Neptune planet with Msini = 27.5 M_earth in a 14.48
d, low-eccentricity orbit. The stellar reflex velocity induced by this planet
has a semiamplitude of K = 6.6 m/s. HD 73534 is a G5 subgiant with a
Jupiter-like planet of Msini = 1.1 M_jup and K = 16 m/s in a nearly circular
4.85 yr orbit. Both stars are chromospherically inactive and metal-rich. We
discuss a known, classical bias in measuring eccentricities for orbits with
velocity semiamplitudes, K, comparable to the radial velocity uncertainties.
For exoplanets with periods longer than 10 days, the observed exoplanet
eccentricity distribution is nearly flat for large amplitude systems (K > 80
m/s), but rises linearly toward low eccentricity for lower amplitude systems (K
> 20 m/s).Comment: 8 figures, 6 tables, accepted, Ap
Five planets and an independent confirmation of HD 196885Ab from Lick Observatory
We present time series Doppler data from Lick Observatory that reveal the
presence of long-period planetary companions orbiting nearby stars. The typical
eccentricity of these massive planets are greater than the mean eccentricity of
known exoplanets. HD30562b has Msini = 1.29 Mjup, with semi-major axis of 2.3
AU and eccentricity 0.76. The host star has a spectral type F8V and is metal
rich. HD86264b has Msini = 7.0 Mjup, arel = 2.86 AU, an eccentricity, e = 0.7
and orbits a metal-rich, F7V star. HD87883b has Msini = 1.78 Mjup, arel = 3.6
AU, e = 0.53 and orbits a metal-rich K0V star. HD89307b has Msini = 1.78 Mjup,
arel = 3.3 AU, e = 0.24 and orbits a G0V star with slightly subsolar
metallicity. HD148427b has Msini = 0.96 Mjup, arel = 0.93 AU, eccentricity of
0.16 and orbits a metal rich K0 subgiant. We also present velocities for a
planet orbiting the F8V metal-rich binary star, HD196885A. The planet has Msini
= 2.58 Mjup, arel = 2.37 AU, and orbital eccentricity of 0.48, in agreement
with the independent discovery by Correia et al. 2008.Comment: 12 figures, 8 tables, accepted Ap
Planet Hunters: The First Two Planet Candidates Identified by the Public using the Kepler Public Archive Data
Planet Hunters is a new citizen science project, designed to engage the
public in an exoplanet search using NASA Kepler public release data. In the
first month after launch, users identified two new planet candidates which
survived our checks for false- positives. The follow-up effort included
analysis of Keck HIRES spectra of the host stars, analysis of pixel centroid
offsets in the Kepler data and adaptive optics imaging at Keck using NIRC2.
Spectral synthesis modeling coupled with stellar evolutionary models yields a
stellar density distribution, which is used to model the transit orbit. The
orbital periods of the planet candidates are 9.8844 \pm0.0087 days (KIC
10905746) and 49.7696 \pm0.00039 (KIC 6185331) days and the modeled planet
radii are 2.65 and 8.05 R\oplus. The involvement of citizen scientists as part
of Planet Hunters is therefore shown to be a valuable and reliable tool in
exoplanet detection.Comment: Submitted to MNRAS, added 1 line to table