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A hyper-runaway white dwarf in Gaia DR2 as a Type Iax supernova primary remnant candidate
Ruffini, Nicholas J.; Casey, Andrew R.
Observations of stellar remnants linked to Type Ia and Type Iax supernovae are necessary to fully understand their progenitors. Multiple progenitor scenarios predict a population of kicked donor remnants and partially burnt primary remnants, both moving with relatively high velocity. But only a handful of examples consistent with these two predict…
DW Cancri in X-rays
Conversi, L.; Nucita, A. A.; Licchelli, D.
We report on the XMM-Newton observation of DW Cnc, a candidate intermediate polar candidate whose historical optical light curve shows the existence of periods at ≃38, ≃86, and ≃69 min, which were interpreted as the white dwarf spin, the orbital and the spin-orbit beat periodicities. By studying the 0.3-10 keV light curves, we confirm the existenc…
The Giant Herbig-Haro Flow HH 212 and Associated Star Formation
Bally, John; Raga, A. C.; Geballe, T. R. +5 more
The bipolar jet HH 212 is one of the finest collimated jets known. It has up to now been detected only in near-infrared H2 emission, but here we present deep optical images that show that two of the major bow shocks are weakly detected in optical [S II] emission, as expected for a bona fide Herbig-Haro jet. We also present widefield H
ISPY - NaCo Imaging Survey for Planets around Young stars. Discovery of an M dwarf in the gap between HD 193571 and its debris ring
Reffert, Sabine; Metchev, Stanimir; Rickman, Emily L. +19 more
Context. The interaction between low-mass companions and the debris discs they reside in is still not fully understood. A debris disc can evolve due to self-stirring, a process in which planetesimals can excite their neighbours to the point of destructive collisions. In addition, the presence of a companion could further stir the disc (companion-s…
Dwarf Galaxy Discoveries from the KMTNet Supernova Program. II. The NGC 3585 Group and Its Dynamical State
Cha, Sang-Mok; Lee, Yongseok; Moon, Dae-Sik +4 more
We present our discovery and analysis of dwarf galaxies in the NGC 3585 galaxy group by the Korea Microlensing Telescope Network (KMTNet) Supernova Program. Using deep stack images reaching ≃28 mag arcsec-2 in BVI, we discovered 46 dwarf galaxy candidates distributed in a field of 7 square degrees. The dwarf galaxy candidates exhibit a …
Morphology and Dynamics of Venus's Middle Clouds With Akatsuki/IR1
Hueso, R.; Sánchez-Lavega, A.; Kardasis, E. +8 more
The Venusian atmosphere is covered by clouds with superrotating winds whose accelerating mechanism is still not well understood. The fastest winds, occurring at the cloud tops (∼70-km height), have been studied for decades, thanks to their visual contrast in dayside ultraviolet images. The middle clouds (∼50-55 km) can be observed at near-infrared…
Candidate Hypervelocity Red Clump Stars in the Galactic Bulge Found Using the VVV and Gaia Surveys
Minniti, Dante; Alonso-García, Javier; Luna, Alonso
We propose a new way to search for hypervelocity stars (HVS) in the Galactic bulge, by using red clump (RC) giants, that are good distance indicators. The second Gaia Data Release and the near-IR data from the VISTA Variables in the Via Lactea (VVV) Survey led to the selection of a volume limited sample of 34 bulge RC stars. A search in this combi…
Detecting dark photon dark matter with Gaia-like astrometry observations
Yuan, Qiang; Zhao, Yue; Guo, Huai-Ke +3 more
A class of dark photon dark matter models with ultralight masses would lead to oscillation of a test body through a coupling with baryons or B-L charge. This periodical oscillation of an observer results in swing of a star's apparent position due to the effect of aberration of light, which could be probed with high-precision astrometry observation…
Impact of substructure on local dark matter searches
Ibarra, Alejandro; Kavanagh, Bradley J.; Rappelt, Andreas
Dark matter substructure can contribute significantly to local dark matter searches and may provide a large uncertainty in the interpretation of those experiments. For direct detection experiments, sub-halos give rise to an additional dark matter component on top of the smooth dark matter distribution of the host halo. In the case of dark matter c…
Pulse frequency fluctuations of magnetars
Serim, M. M.; Şahiner, Ş.; Inam, S. ć. +2 more
Using RXTE, Chandra, XMM-Newton and Swift observations, we construct the power spectra and torque noise strengths of magnetars for the first time. For some of the sources, on time-scales of months to years, we measure strong red noise that might be a consequence of their outbursts. We compare the noise strengths of magnetars with those of radio pu…