Search Publications
Modeling of the Zodiacal Emission for the AKARI/IRC Mid-infrared All-sky Diffuse Maps
Onaka, Takashi; Ootsubo, Takafumi; Kaneda, Hidehiro +6 more
The zodiacal emission, which is the thermal infrared (IR) emission from the interplanetary dust (IPD) in our solar system, has been studied for a long time. Nevertheless, accurate modeling of the zodiacal emission has not been successful to reproduce the all-sky spatial distribution of the zodiacal emission, especially in the mid-IR where the zodi…
Imaging an 80 au Radius Dust Ring around the F5V Star HD 157587
Matthews, Brenda C.; Duchêne, Gaspard; Esposito, Thomas M. +55 more
We present H-band near-infrared polarimetric imaging observations of the F5V star HD 157587 obtained with the Gemini Planet Imager (GPI) that reveal the debris disk as a bright ring structure at a separation of ∼80-100 au. The new GPI data complement recent Hubble Space Telescope/STIS observations that show the disk extending out to over 500 au. T…
An AO-assisted Variability Study of Four Globular Clusters
Contreras Ramos, R.; Catelan, M.; Hakala, P. +4 more
The image-subtraction technique applied to study variable stars in globular clusters represented a leap in the number of new detections, with the drawback that many of these new light curves could not be transformed to magnitudes due to severe crowding. In this paper, we present observations of four Galactic globular clusters, M 2 (NGC 7089), M 10…
The Short Rotation Period of Hi’iaka, Haumea’s Largest Satellite
Margot, Jean-Luc; Brown, Michael E.; Fabrycky, Daniel C. +5 more
Hi’iaka is the larger outer satellite of the dwarf planet Haumea. Using relative photometry from the Hubble Space Telescope and Magellan and a phase dispersion minimization analysis, we have identified the rotation period of Hi’iaka to be ∼9.8 hr (double peaked). This is ∼120 times faster than its orbital period, creating new questions about the f…
Star-forming Activity in the H II Regions Associated with the IRAS 17160-3707 Complex
Ojha, D. K.; Vig, S.; Ghosh, S. K. +3 more
We present a multiwavelength investigation of star formation activity toward the southern H II regions associated with IRAS 17160-3707, located at a distance of 6.2 kpc with a bolometric luminosity of 8.3 × 105 L ⊙. The ionized gas distribution and dust clumps in the parental molecular cloud are examined in detail using measu…
AKARI/IRC Near-infrared Spectral Atlas of Galactic Planetary Nebulae
Onaka, Takashi; Matsuura, Mikako; Sakon, Itsuki +2 more
Near-infrared (2.5-5.0 µm) low-resolution (λ/Δλ ∼ 100) spectra of 72 Galactic planetary nebulae (PNe) were obtained with the Infrared Camera (IRC) in the post-helium phase. The IRC, equipped with a 1‧ × 1‧ window for spectroscopy of a point source, was capable of obtaining near-infrared spectra in a slit-less mode without any flux loss due t…
Hubble Space Telescope Snapshot Survey for Resolved Companions of Galactic Cepheids
Schaefer, Gail H.; Bond, Howard E.; Evans, Nancy Remage +4 more
We have conducted an imaging survey with the Hubble Space Telescope Wide Field Camera 3 (WFC3) of 70 Galactic Cepheids, typically within 1 kpc, with the aim of finding resolved physical companions. The WFC3 field typically covers the 0.1 pc area where companions are expected. In this paper, we identify 39 Cepheids having candidate companions, base…
The SpaceInn-SISMA Database: Characterization of a Large Sample of Variable and Active Stars by Means of Harps Spectra
Roth, M.; Poretti, E.; Michel, E. +6 more
We created a large database of physical parameters and variability indicators by fully reducing and analyzing the large number of spectra taken to complement the asteroseismic observations of the COnvection, ROtation and planetary Transits (CoRoT) satellite. 7103 spectra of 261 stars obtained with the ESO echelle spectrograph HARPS have been store…
IVS Observation of ICRF2-Gaia Transfer Sources
Charlot, P.; Bourda, G.; Le Bail, K. +11 more
The second realization of the International Celestial Reference Frame (ICRF2), which is the current fundamental celestial reference frame adopted by the International Astronomical Union, is based on Very Long Baseline Interferometry (VLBI) data at radio frequencies in X band and S band. The European Space Agency’s Gaia mission, launched on 2013 De…
Very Low-mass Stellar and Substellar Companions to Solar-like Stars from MARVELS. VI. A Giant Planet and a Brown Dwarf Candidate in a Close Binary System HD 87646
Bizyaev, Dmitry; Ge, Jian; Schneider, Donald P. +34 more
We report the detections of a giant planet (MARVELS-7b) and a brown dwarf (BD) candidate (MARVELS-7c) around the primary star in the close binary system, HD 87646. To the best of our knowledge, it is the first close binary system with more than one substellar circumprimary companion that has been discovered. The detection of this giant planet was …