Search Publications
A Tale of Three Dust Populations: Variable R V and Extreme Polarization along Sight Lines toward ζ Ophiuchi
Piccone, Ashley N.; Kobulnicky, Henry A.
Dust permeates the interstellar medium, reddening and polarizing background starlight, but dust properties vary with local environment. In order to characterize dust in a highly irradiated diffuse cloud, we measure the reddening and optical polarization toward 27 stars surrounding the midlatitude b = +24° O9.2IV star ζ Ophiuchi, using new optical …
PIPS, an advanced platform for period detection in time series - I. Fourier-likelihood periodogram and application to RR Lyrae stars
Filippenko, Alexei V.; Stahl, Benjamin E.; Savel, Arjun B. +7 more
We describe the Period detection and Identification Pipeline Suite (PIPS) - a new, fast, and statistically robust platform for period detection and analysis of astrophysical time-series data. PIPS is an open-source Python package that provides various pre-implemented methods and a customizable framework for automated, robust period measurements wi…
The Origin of The Soft X-Ray Excess in the Seyfert 1.5 Galaxy ESO 362-G18
Zhong, Xiao-Gu; Wang, Jian-Cheng
We review the Seyfert 1.5 Galaxy ESO 362-G18 for exploring the origin of the soft X-ray excess. The Warm Corona and Relativistic Reflection models are two main scenarios to interpret the soft X-ray excess in active galactic nuclei at present. We use the simultaneous X-ray observation data of XMM-Newton and NuSTAR on 2016 September 24 to perform sp…
Detailed investigation of two high-speed evolved Galactic stars
Mucciarelli, Alessio; Aoki, Wako; Suda, Takuma +10 more
The study of metal poor stars provides clarification and knowledge about the primordial Universe. Specially, halo stars provide explanations of the nature of the first generations of stars and the nucleosynthesis in the metal-poor regime. We present a detailed chemical analysis and determination of the kinematic and orbital properties of two stars…
Massive stars dying alone: the remote environment of supernova 2010jp and its associated late-time source
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Corgan, Austin +2 more
We present late-time images of the site of the peculiar jet-driven Type IIn supernova (SN) 2010jp, including Hubble Space Telescope images taken 2-5 yr post-explosion and deep ground-based images over a similar time. These are used to characterize its unusually remote environment and to constrain the progenitor's initial mass and age. The position…
ANDICAM I- and J-band monitoring of bright inner Galactic late-type stars
Messineo, Maria
Time-series photometry in the I and J bands of 57 inner Galactic late-type stars, highly probable red supergiant (RSG) stars, is presented here. 38% of the sample presents significant photometric variations. The variations in the I and J bands appear to be correlated, with ΔI ∝ ΔJ × 2.2, ΔI variations ranging from 0.04-1.08 mag, and ΔJ variations …
PyNAPLE: Lunar Surface Impact Crater Detection
Delbo, M.; Avdellidou, C.; Sefton-Nash, E. +4 more
In the last 20 yr, over 600 impact flashes have been documented on the lunar surface. This wealth of data presents a unique opportunity to study the meteoroid flux of the Earth-Moon environment, and in recent years the physical properties of the impactors. However, other than through serendipitous events, there has not been yet a systematic search…
Kinematics of the Galaxy from Young Open Star Clusters with Data from the Gaia EDR3 Catalogue
Bobylev, V. V.; Bajkova, A. T.
We have analyzed the kinematics of open star clusters (OSCs) with the proper motions and distances calculated by Hao et al. based on Gaia EDR3 data. The mean line-of-sight velocities are known for a number of clusters from this list. We show that the Galactic rotation parameters determined from samples of OSCs with various ages are in good agreeme…
Astrobiological Potential of Fe/Mg Smectites with Special Emphasis on Jezero Crater, Mars 2020 Landing Site
Singh, Deepali; Sinha, Rishitosh K.; Singh, Priyadarshini +2 more
Life is known to adapt in accordance with its surrounding environment and sustainable resources available to it. Since harsh conditions would have precluded any possible aerobic evolution of life at the martian surface, it is plausible that martian life, should it exist, would have evolved in such a way as to derive energy from more optimum resour…
Sympathetic Quiet and Active Region Filament Eruptions
Joshi, Reetika; Chandra, Ramesh; Koleva, Kostadinka +3 more
We present the observations of three sympathetic filament eruptions occurring on 19 July 2015, namely F1, F2, and F3. The events were observed in UV and EUV by the Atmospheric Imaging Assembly on board the Solar Dynamics Observatory and by Global Oscillation Network Group telescope in Hα line. As filament F1