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Three microlensing planets with no caustic-crossing features
Han, Cheongho; Udalski, Andrzej; Lee, Chung-Uk +31 more
Aims: We search for microlensing planets with signals exhibiting no caustic-crossing features, considering the possibility that such signals may be missed due to their weak and featureless nature.
Methods: For this purpose, we reexamine the lensing events found by the KMTNet survey before the 2019 season. From this investigation, we find…
TESS unveils the optical phase curve of KELT-1b. Thermal emission and ellipsoidal variation from the brown dwarf companion along with the stellar activity
Mallonn, M.; Agol, E.; von Essen, C. +8 more
We present the detection and analysis of the phase curve of KELT-1b at optical wavelengths, analyzing data taken by the Transiting Exoplanet Survey Satellite (TESS) during cycle 2 and sector 17. With a mass of ~27 MJup, KELT-1b is an example of a low-mass brown dwarf. Due to the high mass and close proximity of its companion, the host s…
Dispersal timescale of protoplanetary disks in the low-metallicity young cluster Dolidze 25
Neiner, C.; Micela, G.; Sciortino, S. +7 more
Context. The dispersal of protoplanetary disks sets the timescale that is available for planets to assemble, and thus it is one of the fundamental parameters in theories of planetary formation. Disk dispersal is determined by several properties of the central star, the disk itself, and the surrounding environment. In particular, the metallicity of…
Low-mass compact elliptical galaxies: spatially resolved stellar populations and kinematics with the Keck Cosmic Web Imager
Forbes, Duncan A.; Romanowsky, Aaron J.; Brodie, Jean P. +4 more
We present spatially resolved two-dimensional maps and radial trends of the stellar populations and kinematics for a sample of six compact elliptical galaxies (cE) using spectroscopy from the Keck Cosmic Web Imager (KCWI). We recover their star formation histories, finding that all except one of our cEs are old and metal rich, with both age and me…
The Tully-Fisher relation in dense groups at z ∼ 0.7 in the MAGIC survey
Finley, Hayley; Boogaard, Leindert A.; Brinchmann, Jarle +11 more
Context. Galaxies in dense environments are subject to interactions and mechanisms that directly affect their evolution by lowering their gas fractions and consequently reducing their star-forming capacity earlier than their isolated counterparts.
Aims: The aim of our project is to get new insights into the role of environment in the stellar …
Gaia EDR3 Parallax Distances to the Great Carina Nebula and Its Star Clusters (Trumpler 14, 15, 16)
Shull, J. Michael; Danforth, Charles W.; Darling, Jeremy
Using offset-corrected Gaia EDR3 parallax measurements and spectrophotometric methods, we have determined distances for 69 massive stars in the Carina OB1 association and associated clusters: Trumpler 16 (21 stars), Trumpler 14 (20 stars), Trumpler 15 (three stars), Bochum 11 (five stars), and South Pillars region (20 stars). Past distance estimat…
Progress on the calibration of surface brightness-color relations for early- and late-type stars
Schaefer, G. H.; Perraut, K.; Nardetto, N. +8 more
Context. Surface brightness-color relations (SBCRs) are widely used for estimating angular diameters and deriving stellar properties. They are critical to derive extragalactic distances of early-type and late-type eclipsing binaries or, potentially, for extracting planetary parameters of late-type stars hosting planets. Various SBCRs have been imp…
3D mapping of the Crab Nebula with SITELLE - I. Deconvolution and kinematic reconstruction
Milisavljevic, D.; Drissen, L.; Martin, T.
We present a hyperspectral cube of the Crab Nebula obtained with the imaging Fourier transform spectrometer SITELLE on the Canada-France-Hawaii telescope. We describe our techniques used to deconvolve the 310 000 individual spectra ($R = 9\, 600$) containing Hα, [N II] λλ6548, 6583, and [S II] λλ6716, 6731 emission lines and create a detailed 3D r…
Signature of a Heliotail Organized by the Solar Magnetic Field and the Role of Nonideal Processes in Modeled IBEX ENA Maps: A Comparison of the BU and Moscow MHD Models
Galli, A.; Richardson, J. D.; Zank, G. P. +9 more
Energetic neutral atom (ENA) models typically require post-processing routines to convert the distributions of plasma and H atoms into ENA maps. Here we investigate how two kinetic-MHD models of the heliosphere (the BU and Moscow models) manifest in modeled ENA maps using the same prescription and how they compare with Interstellar Boundary Explor…
Confirming NGC 6231 as the parent cluster of the runaway high-mass X-ray binary HD 153919/4U 1700-37 with Gaia DR2
Kaper, Lex; Renzo, Mathieu; van der Meij, Vincent +1 more
Context. A significant fraction (10-20%) of the most massive stars move through space with a high (v ≳ 30 km s−1) velocity. One of the possible physical explanations is that a supernova in a compact binary system results in a high recoil velocity of the system. If the system remains bound, it can be subsequently observed as a spectrosco…