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The hierarchical triple nature of the former red nova precursor candidate KIC 9832227
Hartman, Joel D.; Bakos, Gáspár Á.; Kovacs, Geza
We revisit the issue of period variation of the recently claimed red nova precursor candidate KIC 9832227. By using the data gathered during the main mission of the Kepler satellite, and data collected by ground-based wide-field surveys and other monitoring programs (such as ASAS-SN), we find that the currently available timing data strongly suppo…
First Assessment of the Binary Lens OGLE-2015-BLG-0232
Bennett, D. P.; Soszyński, I.; Udalski, A. +54 more
We present an analysis of the microlensing event OGLE-2015-BLG-0232. This event is challenging to characterize for two reasons. First, the light curve is not well sampled during the caustic crossing due to the proximity of the full Moon impacting the photometry quality. Moreover, the source brightness is difficult to estimate because this event is…
Surface magnetic activity of the fast-rotating G5 giant IN Comae, central star of the faint planetary nebula LoTr 5
Strassmeier, K. G.; Weber, M.; Ilyin, I. +8 more
Context. On the asymptotic giant branch, low to intermediate mass stars blow away their outer envelopes, forming planetary nebulae. Dynamic interaction between the planetary nebula and its central progenitor is poorly understood. The interaction is even more complex when the central object is a binary star with a magnetically active component, as …
Global Spectral Properties and Lithology of Mercury: The Example of the Shakespeare (H-03) Quadrangle
Capaccioni, F.; Doressoundiram, A.; Perna, D. +4 more
The MErcury Surface, Space ENvironment, GEochemistry and Ranging mission showed the surface of Mercury with an accuracy never reached before. The morphological and spectral analyses performed thanks to the data collected between 2008 and 2015 revealed that the Mercurian surface differs from the surface of the Moon, although they look visually very…
The Discovery of Quasi-stellar Objects behind M31 and M33
Massey, Philip; Levesque, Emily M.; Neugent, Kathryn F.
We report the discovery of 11 newly found quasars behind the stellar disks of the spiral galaxies M31 and M33 in the fields covered by the Local Group Galaxy Survey. Their redshifts range from 0.37 to 2.15. Most are X-ray, ultraviolet, and infrared sources. We also report the discovery of five normal background galaxies. Most of these objects were…
Optical design of the High Resolution Imaging Channel of SIMBIO-SYS
Cremonese, Gabriele; Palumbo, Pasquale; Zusi, Michele +4 more
Active Asteroid P/2017 S5 (ATLAS)
Mutchler, Max; Kotulla, Ralf; Jewitt, David +7 more
Observations of active asteroid P/2017 S5 when near perihelion reveal the ejection of large (102-104 µm) particles at 0.2-2 m s-1 speeds, with estimated mass-loss rates of a few kg s-1. The protracted nature of the mass loss (continuous over ∼150 days) is compatible with a sublimation origin, meani…
Observability of hydrogen-rich exospheres in Earth-like exoplanets
dos Santos, Leonardo A.; Bourrier, Vincent; Ehrenreich, David +1 more
Context. The existence of an extended neutral hydrogen exosphere around small planets can be used as evidence of the presence of water in their lower atmosphere, but, to date, such a feature has not been securely detected in rocky exoplanets. Planetary exospheres can be observed using transit spectroscopy of the Lyman-α line, which is limited main…
Hot subdwarf wind models with accurate abundances. I. Hydrogen dominated stars HD 49798 and BD+18° 2647
Mereghetti, S.; Pintore, F.; Krtička, J. +5 more
Context. Hot subdwarfs are helium burning objects in late stages of their evolution. These subluminous stars can develop winds driven by light absorption in the lines of heavier elements. The wind strength depends on chemical composition which can significantly vary from star to star.
Aims: We aim to understand the influence of metallicity on…
A universal relation of dust obscuration across cosmic time
Zheng, Xian Zhong; Wuyts, Stijn; Pan, Zhizheng +2 more
We investigate dust obscuration as parametrized by the infrared excess IRX ≡ LIR/LUV in relation to global galaxy properties, using a sample of ∼32 000 local star-forming galaxies (SFGs) selected from SDSS (Sloan Digital Sky Survey), GALEX (Galaxy Evolution Explorer), and WISE (Wide-field Infrared Survey Explorer). We show th…