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Detection of Hundreds of New Planet Candidates and Eclipsing Binaries in K2 Campaigns 0-8
Kruse, Ethan; Foreman-Mackey, Daniel; Luger, Rodrigo +1 more
We implement a search for exoplanets in campaigns zero through eight (C0-8) of the K2 extension of the Kepler spacecraft. We apply a modified version of the QATS planet search algorithm to K2 light curves produced by the EVEREST pipeline, carrying out the C0-8 search on 1.5 × 105 target stars with magnitudes in the range of Kp = 9-15. W…
The Evolution of the Quenching of Star Formation in Cluster Galaxies since z ∼ 1
Muzzin, A.; Wilson, G.; Yee, H. K. C. +2 more
We study the star-forming (SF) population of galaxies within a sample of 209 IR-selected galaxy clusters at 0.3 ≤ z ≤ 1.1 in the ELAIS-N1 and XMM-LSS fields, exploiting the first HSC-SSP data release. The large area and depth of these data allow us to analyze the dependence of the SF fraction, f SF, on stellar mass and environment separ…
A measurement of the Hubble constant from angular diameter distances to two gravitational lenses
Fassnacht, Christopher D.; Hilbert, Stefan; Suyu, Sherry H. +3 more
The local expansion rate of the Universe is parametrized by the Hubble constant, H0, the ratio between recession velocity and distance. Different techniques lead to inconsistent estimates of H0. Observations of Type Ia supernovae (SNe) can be used to measure H0, but this requires an external calibrator to convert relative distances to absolute one…
Cloudlet capture by transitional disk and FU Orionis stars
Kramer, M.; Fukagawa, M.; Dullemond, C. P. +3 more
After its formation, a young star spends some time traversing the molecular cloud complex in which it was born. It is therefore not unlikely that, well after the initial cloud collapse event which produced the star, it will encounter one or more low mass cloud fragments, which we call "cloudlets" to distinguish them from full-fledged molecular clo…
A search for accreting young companions embedded in circumstellar disks. High-contrast Hα imaging with VLT/SPHERE
Pinte, C.; van der Plas, G.; Quanz, S. P. +37 more
Context. In recent years, our understanding of giant planet formation progressed substantially. There have even been detections of a few young protoplanet candidates still embedded in the circumstellar disks of their host stars. The exact physics that describes the accretion of material from the circumstellar disk onto the suspected circumplanetar…
Binarity among CEMP-no stars: an indication of multiple formation pathways?
Arentsen, A.; Starkenburg, E.; Venn, K. A. +3 more
Carbon-enhanced metal-poor (CEMP) stars comprise a high percentage of stars at the lowest metallicities. The stars in the CEMP-no subcategory do not show any s-process enhancement and therefore cannot easily be explained by transfer of carbon and s-process elements from a binary AGB companion. We have performed radial velocity monitoring of a samp…
A contribution of star-forming clumps and accreting satellites to the mass assembly of z ∼ 2 galaxies
Daddi, E.; Le Floc'h, E.; Bournaud, F. +14 more
We investigate the contribution of clumps and satellites to the galaxy mass assembly. We analysed spatially resolved HubbleSpace Telescope observations (imaging and slitless spectroscopy) of 53 star-forming galaxies at z ∼ 1-3. We created continuum and emission line maps and pinpointed residual `blobs' detected after subtracting the galaxy disc. T…
Early- and late-stage mergers among main sequence and starburst galaxies at 0.2 ≤ z ≤ 2
Daddi, E.; Elbaz, D.; Le Floc'h, E. +12 more
We investigate the fraction of close pairs and morphologically identified mergers on and above the star-forming main sequence (MS) at 0.2 ≤ z ≤2.0. The novelty of our work lies in the use of a non-parametric morphological classification performed on resolved stellar mass maps, reducing the contamination by non-interacting, high-redshift clumpy gal…
A volume-limited survey of mCP stars within 100 pc - I. Fundamental parameters and chemical abundances
Wade, G. A.; Neiner, C.; Sikora, J. +1 more
We present the first results of a volume-limited survey of main-sequence (MS) magnetic chemically peculiar (mCP) stars. The sample consists of all identified intermediate-mass MS stars (mCP and non-mCP) within a heliocentric distance of 100 pc as determined using Hipparcos parallaxes. The two populations are compared in order to determine the uniq…
Exploring the Age-dependent Properties of M and L Dwarfs Using Gaia and SDSS
Angus, Ruth; Kiman, Rocio; Faherty, Jacqueline K. +3 more
We present a sample of 74,216 M and L dwarfs constructed from two existing catalogs of cool dwarfs spectroscopically identified in the Sloan Digital Sky Survey (SDSS). We cross-matched the SDSS catalog with Gaia DR2 to obtain parallaxes and proper motions and modified the quality cuts suggested by the Gaia Collaboration to make them suitable for l…