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Compton-thick AGNs in the NuSTAR Era. III. A Systematic Study of the Torus Covering Factor
Cusumano, G.; Vignali, C.; Comastri, A. +9 more
We present the analysis of a sample of 35 candidate Compton-thick active galactic nuclei (AGNs) selected in the nearby universe (average redshift < z> ∼ 0.03) with the Swift-BAT 100-month survey. All sources have available NuSTAR data, thus allowing us to constrain with unprecedented quality important spectral parameters such as the obscurin…
Spectral and orbital characterisation of the directly imaged giant planet HIP 65426 b
Queloz, D.; Quanz, S. P.; Avenhaus, H. +38 more
HIP 65426 b is a recently discovered exoplanet imaged during the course of the SPHERE-SHINE survey. Here we present new L' and M' observations of the planet from the NACO instrument at the VLT from the NACO-ISPY survey, as well as a new Y -H spectrum and K-band photometry from SPHERE-SHINE. Using these data, we confirm the nature of the companion …
OCCASO - III. Iron peak and α elements of 18 open clusters. Comparison with chemical evolution models and field stars
Jordi, C.; Casamiquela, L.; Anders, F. +10 more
The study of open-cluster chemical abundances provides insights on stellar nucleosynthesis processes and on Galactic chemo-dynamical evolution. In this paper we present an extended abundance analysis of 10 species (Fe, Ni, Cr, V, Sc, Si, Ca, Ti, Mg, O) for red giant stars in 18 OCCASO clusters. This represents a homogeneous sample regarding the in…
Upper limits on CH3OH in the HD 163296 protoplanetary disk. Evidence for a low gas-phase CH3OH-to-H2CO ratio
Carpenter, J. M.; Walsh, C.; Hogerheijde, M. R. +6 more
Context. Methanol (CH3OH) is at the root of organic ice chemistry in protoplanetary disks. Its connection to prebiotic chemistry and its role in the chemical environment of the disk midplane make it an important target for disk chemistry studies. However, its weak emission has made detections difficult. To date, gas-phase CH3…
Combined Effects of Rotation and Age Spreads on Extended Main-Sequence Turn Offs
Dolphin, Andrew E.; Williams, Benjamin F.; Johnson, L. Clifton +10 more
The extended main-sequence turn offs (eMSTOs) of several young to intermediate age clusters are examined in the Magellanic Clouds and the Milky Way. We explore the effects of extended star formation (eSF) and a range of stellar rotation rates on the behavior of the color-magnitude diagram, paying particular attention to the MSTO. We create synthet…
The Carnegie-Chicago Hubble Program. VII. The Distance to M101 via the Optical Tip of the Red Giant Branch Method
Madore, Barry F.; Freedman, Wendy L.; Beaton, Rachael L. +9 more
The Carnegie-Chicago Hubble Program (CCHP) is building a direct path to the Hubble constant (H 0) using Population II stars as the calibrator of the Type Ia supernova (SN Ia)-based distance scale. This path to calibrate the SNe Ia is independent of the systematics in the traditional Cepheid-based technique. In this paper, we present the…
HD 2685 b: a hot Jupiter orbiting an early F-type star detected by TESS
Henning, Thomas; Vanderburg, Andrew; Latham, David W. +50 more
We report on the confirmation of a transiting giant planet around the relatively hot (Teff = 6801 ± 76 K) star HD 2685, whose transit signal was detected in Sector 1 data of NASA's TESS mission. We confirmed the planetary nature of the transit signal using Doppler velocimetric measurements with CHIRON, CORALIE, and FEROS, as well as usi…
Hi-C 2.1 Observations of Jetlet-like Events at Edges of Solar Magnetic Network Lanes
Tiwari, Sanjiv K.; Winebarger, Amy R.; Warren, Harry P. +15 more
We present high-resolution, high-cadence observations of six, fine-scale, on-disk jet-like events observed by the High-resolution Coronal Imager 2.1 (Hi-C 2.1) during its sounding-rocket flight. We combine the Hi-C 2.1 images with images from the Solar Dynamics Observatory (SDO)/Atmospheric Imaging Assembly (AIA) and the Interface Region Imaging S…
The MASSIVE Survey. XII. Connecting Stellar Populations of Early-type Galaxies to Kinematics and Environment
Ma, Chung-Pei; Greene, Jenny E.; Blakeslee, John P. +6 more
We measure the stellar populations as a function of the radius for 90 early-type galaxies (ETGs) in the MASSIVE survey, a volume-limited integral-field spectroscopic (IFS) galaxy survey targeting all northern-sky ETGs with an absolute K-band magnitude of M K < -25.3 mag or a stellar mass of {M}* ≳ 4× {10}11 {M…
Carbon-rich (DQ) white dwarfs in the Sloan Digital Sky Survey
Kepler, S. O.; Koester, D.
Context. Among the spectroscopically identified white dwarfs, a fraction smaller than 2% have spectra dominated by carbon lines, mainly molecular C2, but also a smaller group dominated by C I and C II lines. These are together called DQ white dwarfs.
Aims: We want to derive atmospheric parameters Teff, log g, and carbon …