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Spitzer Ultra Faint SUrvey Program (SURFS UP). I. An Overview
Casertano, Stefano; Treu, Tommaso; Bradač, Maruša +14 more
Spitzer UltRa Faint SUrvey Program is a joint Spitzer and Hubble Space Telescope Exploration Science program using 10 galaxy clusters as cosmic telescopes to study z >~ 7 galaxies at intrinsically lower luminosities, enabled by gravitational lensing, than blank field surveys of the same exposure time. Our main goal is to measure stellar masses …
Study of Two Successive Three-ribbon Solar Flares on 2012 July 6
Xu, Yan; Cao, Wenda; Liu, Chang +4 more
This Letter reports two rarely observed three-ribbon flares (M1.9 and C9.2) on 2012 July 6 in NOAA AR 11515, which we found using Hα observations of 0.''1 resolution from the New Solar Telescope and Ca II H images from Hinode. The flaring site is characterized by an intriguing "fish-bone-like" morphology evidenced by both Hα images and a nonlinear…
Cosmic equation of state from combined angular diameter distances: Does the tension with luminosity distances exist?
Cao, Shuo; Zhu, Zong-Hong
Using relatively complete observational data concerning four angular diameter distance (ADD) measurements and combined SN +GRB observations representing current luminosity distance (LD) data, this paper investigates the compatibility of these two cosmological distances considering three classes of dark energy equation of state (EoS) reconstruction…
The Physical Parameters of the Retired a Star HD 185351
Barclay, Thomas; Huber, Daniel; Stello, Dennis +6 more
We report here an analysis of the physical stellar parameters of the giant star HD 185351 using Kepler short-cadence photometry, optical and near infrared interferometry from CHARA, and high-resolution spectroscopy. Asteroseismic oscillations detected in the Kepler short-cadence photometry combined with an effective temperature calculated from the…
Integration of Chang'E-2 imagery and LRO laser altimeter data with a combined block adjustment for precision lunar topographic modeling
Wu, Bo; Guo, Jian; Hu, Han
Lunar topographic information is essential for lunar scientific investigations and exploration missions. Lunar orbiter imagery and laser altimeter data are two major data sources for lunar topographic modeling. Most previous studies have processed the imagery and laser altimeter data separately for lunar topographic modeling, and there are usually…
The distribution of methane in Titan’s stratosphere from Cassini/CIRS observations
Lellouch, E.; Flasar, F. M.; Bézard, B. +5 more
Cassini/CIRS spectra in the far- and mid-infrared region are used to determine the abundance of methane in Titan's lower stratosphere and investigate its distribution with latitude. The CIRS spectra include emission from both the CH4 ν4 band at 7.7 µm and pure rotational lines longwards of 50 µm, which show differ…
A Spectroscopic Census in Young Stellar Regions: The σ Orionis Cluster
Briceño, Cesar; Hartmann, Lee; Calvet, Nuria +7 more
We present a spectroscopic survey of the stellar population of the σ Orionis cluster. We have obtained spectral types for 340 stars. Spectroscopic data for spectral typing come from several spectrographs with similar spectroscopic coverage and resolution. More than half of the stars in our sample are members confirmed by the presence of lithium in…
An edge-on translucent dust disk around the nearest AGB star, L2 Puppis. VLT/NACO spectro-imaging from 1.04 to 4.05 µm and VLTI interferometry
Kervella, P.; Chiavassa, A.; Chesneau, O. +6 more
As the nearest known AGB star (d = 64 pc) and one of the brightest (mK ≈ -2), L2 Pup is a particularly interesting benchmark object to monitor the final stages of stellar evolution. We report new serendipitous imaging observations of this star with the VLT/NACO adaptive optics system in twelve narrow-band filters covering the…
Resolving HD 100546 disc in the mid-infrared: Small inner disc and asymmetry near the gap
Jaffe, W.; Dominik, C.; Henning, Th. +5 more
Context. A region of roughly half of the solar system scale around the star HD 100546 is known to be largely cleared of gas and dust, in contrast to the outer disc that extends to about 400 AU. However, some material is observed in the immediate vicinity of the star, called the inner disc. Studying the structure of the inner and the outer disc is …
Radio Timing and Optical Photometry of the Black Widow System PSR J1518+0204C in the Globular Cluster M5
Dalessandro, E.; Ransom, S. M.; Ferraro, F. R. +5 more
We report on the determination of astrometric, spin, and orbital parameters for PSR J1518+0204C, a "black widow" binary millisecond pulsar in the globular cluster (GC) M5. The accurate position and orbital parameters obtained from radio timing allowed us to search for the optical companion. By using WFC3/Hubble Space Telescope images, we identifie…