Search Publications
Neutral Gas Properties and Lyα Escape in Extreme Green Pea Galaxies
Jaskot, Anne E.; Yun, Min S.; Dowd, Tara +3 more
Mechanisms regulating the escape of Lyα photons and ionizing radiation remain poorly understood. To study these processes, we analyze Very Large Array 21 cm observations of one Green Pea (GP), J160810+352809 (hereafter J1608), and Hubble Space Telescope Cosmic Origins Spectrograph (COS) spectra of 17 GP galaxies at z< 0.2. All are highly ionize…
A statistically significant lack of debris discs in medium separation binary systems
Wyatt, Mark C.; Kennedy, Grant M.; Su, Kate Y. L. +1 more
We compile a sample of 341 binary and multiple star systems with the aim of searching for and characterizing Kuiper belt-like debris discs. The sample is assembled by combining several smaller samples studied in previously published work with targets from two unpublished Herschel surveys. We find that 38 systems show excess emission at 70 or 100 &…
Detections of [O III] 88 µm in two quasars in the reionization epoch
Inoue, Akio K.; Hashimoto, Takuya; Tamura, Yoichi +3 more
We report on detections with the Atacama Large Millimeter/sub-millimeter Array of the far-infrared [O III] 88 µm line and the underlying dust continuum in two quasars in the reionization epoch, J205406.48-000514.8 (hereafter J2054-0005) at z = 6.0391 ± 0.0002 and J231038.88+185519.7 (hereafter J2310+1855) at z = 6.0035 ± 0.0007. The [O III] …
Tensile Strength of Porous Dust Aggregates
Kataoka, Akimasa; Tatsuuma, Misako; Tanaka, Hidekazu
Comets are thought to have information about the formation process of our solar system. Recently, detailed information about comet 67P/Churyumov-Gerasimenko was found by Rosetta. It is remarkable that its tensile strength was estimated. In this paper, we measure and formulate the tensile strength of porous dust aggregates using numerical simulatio…
Random Forest identification of the thin disc, thick disc, and halo Gaia-DR2 white dwarf population
Solano, E.; Rebassa-Mansergas, A.; Torres, S. +3 more
Gaia-DR2 has provided an unprecedented number of white dwarf candidates of our Galaxy. In particular, it is estimated that Gaia-DR2 has observed nearly 400 000 of these objects and close to 18 000 up to 100 pc from the Sun. This large quantity of data requires a thorough analysis in order to uncover their main Galactic population properties, in pa…
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…