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Production of O2 through dismutation of H2O2 during water ice desorption: a key to understanding comet O2 abundances
Bockelée-Morvan, D.; Dulieu, F.; Minissale, M.
Context. Detection of molecular oxygen and prediction of its abundance have long been a challenge for astronomers. The low abundances observed in few interstellar sources are well above the predictions of current astrochemical models. During the Rosetta mission, an unexpectedly high abundance of O2 was discovered in the comet 67P/Churyu…
Interstellar-medium Mapping in M82 through Light Echoes around Supernova 2014J
Baade, Dietrich; Sparks, William B.; Wang, Lifan +10 more
We present multiple-epoch measurements of the size and surface brightness of the light echoes from supernova (SN) 2014J in the nearby starburst galaxy M82. Hubble Space Telescope (HST) ACS/WFC images were taken ∼277 and ∼416 days after B-band maximum in the filters F475W, F606W, and F775W. Observations with HST WFC3/UVIS images at epochs ∼216 and …
H0LiCOW. VI. Testing the fidelity of lensed quasar host galaxy reconstruction
Treu, Tommaso; Marshall, Philip J.; Sonnenfeld, Alessandro +11 more
The empirical correlation between the mass of a supermassive black hole (M_BH) and its host galaxy properties is widely considered to be an evidence of their co-evolution. A powerful way to test the co-evolution scenario and learn about the feedback processes linking galaxies and nuclear activity is to measure these correlations as a function of r…
New Evidence for the Dynamical Decay of a Multiple System in the Orion Kleinmann-Low Nebula
Luhman, K. L.; Robberto, M.; Manara, C. F. +5 more
We have measured astrometry for members of the Orion Nebula Cluster with images obtained in 2015 with the Wide Field Camera 3 on board the Hubble Space Telescope. By comparing those data to previous measurements with the Near-Infrared Camera and Multi-Object Spectrometer on Hubble in 1998, we have discovered that a star in the Kleinmann-Low Nebula…
The Pan-Pacific Planet Search. VII. The Most Eccentric Planet Orbiting a Giant Star
Marshall, J. P.; Mustill, A. J.; Kane, Stephen R. +9 more
Radial velocity observations from three instruments reveal the presence of a 4 MJup planet candidate orbiting the K giant HD 76920. HD 76920b has an orbital eccentricity of 0.856 ± 0.009, making it the most eccentric planet known to orbit an evolved star. There is no indication that HD 76920 has an unseen binary companion, suggesting a …
Ultra-short-period Planets in K2 with Companions: A Double Transiting System for EPIC 220674823
Baranec, Christoph; Cochran, William D.; Duev, Dmitry A. +10 more
Two transiting planets have been identified orbiting K2 target EPIC 220674823. One object is an ultra-short-period planet (USP) with a period of just 0.57 days (13.7 hr), while the other has a period of 13.3 days. Both planets are small, with the former having a radius of {R}{{p}1}=1.5 {R}\oplus and the latter {R}{{p
Constraints on the structure of hot exozodiacal dust belts
Kirchschlager, Florian; Krivov, Alexander V.; Wolf, Sebastian +2 more
Recent interferometric surveys of nearby main-sequence stars show a faint but significant near-infrared excess in roughly two dozen systems, I.e. around 10-30 per cent of stars surveyed. This excess is attributed to dust located in the immediate vicinity of the star, the origin of which is highly debated. We used previously published interferometr…
Multiwavelength Stellar Polarimetry of the Filamentary Cloud IC5146. I. Dust Properties
Wang, Jia-Wei; Lai, Shih-Ping; Eswaraiah, Chakali +3 more
We present optical and near-infrared stellar polarization observations toward the dark filamentary clouds associated with IC5146. The data allow us to investigate the dust properties (this paper) and the magnetic field structure (Paper II). A total of 2022 background stars were detected in the R c , I\prime , H, and/or K ban…
Mars plasma system response to solar wind disturbances during solar minimum
Holmström, M.; Odstrcil, D.; Lester, M. +16 more
This paper is a phenomenological description of the ionospheric plasma and induced magnetospheric boundary (IMB) response to two different types of upstream solar wind events impacting Mars in March 2008, at the solar minimum. A total of 16 Mars Express orbits corresponding to five consecutive days is evaluated. Solar TErrestrial RElations Observa…
Long optical plateau in the afterglow of the short GRB 150424A with extended emission. Evidence for energy injection by a magnetar?
Greiner, J.; Klose, S.; Schady, P. +14 more
Context. Short-duration gamma-ray bursts (GRBs) with extended emission form a subclass of short GRBs, comprising about 15% of the short-duration sample. Afterglow detections of short GRBs are also rare (about 30%) because of their lower luminosity.
Aims: We present a multiband data set of the short burst with extended emission, GRB 150424A, c…