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Impact-generated winds on Mars
Schultz, Peter H.; Quintana, Stephanie N.
Bright and dark wind streaks across Mars record wind patterns related to atmospheric circulation. In some cases these streaks represent erosion of a surface veneer; in others, they indicate sand grains mobilized by strong vortices shed off of positive relief, such as crater rims. While many streaks change length or orientation over time, others no…
Spatially resolved analysis of superluminous supernovae PTF 11hrq and PTF 12dam host galaxies
Perley, Daniel A.; Lunnan, Ragnhild; Kim, Sam +12 more
Superluminous supernovae (SLSNe) are the most luminous supernovae in the Universe. They are found in extreme star-forming galaxies and are probably connected with the death of massive stars. One hallmark of very massive progenitors would be a tendency to explode in very dense, UV-bright and blue regions. In this paper, we investigate the resolved …
Coronal mass ejections and solar wind mass fluxes over the heliosphere during solar cycles 23 and 24 (1996-2014)
Lamy, P.; Quémerais, E.; Floyd, O. +2 more
Coronal mass ejections (CMEs) play a major role in the heliosphere, and their contribution to the solar wind mass flux, already considered in the Skylab and Solwind eras with conflicting results, is reexamined in the light of 19 years (1996-2014) of SOHO observations with the Large Angle and Spectroscopic Coronagraph (LASCO-C2) for the CMEs and ex…
The Gaia Data Release 1 parallaxes and the distance scale of Galactic planetary nebulae
Stanghellini, Letizia; Bucciarelli, Beatrice; Lattanzi, Mario G. +1 more
In this paper we gauge the potentiality of Gaia in the distance scale calibration of planetary nebulae (PNe) by assessing the impact of DR1 parallaxes of central stars of Galactic PNe (CSPNe) against known physical relations. For selected PNe targets with state-of-the-art data on angular sizes and fluxes, we derive the distance-dependent parameter…
The early B-type star Rho Ophiuchi A is an X-ray lighthouse
Reale, Fabio; Wolk, Scott J.; Pillitteri, Ignazio +1 more
We present the results of a 140 ks XMM-Newton observation of the B2 star ρ Oph A. The star has exhibited strong X-ray variability: a cusp-shaped increase of rate, similar to that which we partially observed in 2013, and a bright flare. These events are separated in time by about 104 ks, which likely correspond to the rotational period of the star …
K2-113: a dense hot-Jupiter transiting a solar analogue
Jordán, Andrés; Espinoza, Néstor; Brahm, Rafael +8 more
We present the discovery of K2-113, a dense hot-Jupiter discovered using photometry from Campaign 8 of the Kepler-2 (K2) mission and high-resolution spectroscopic follow-up obtained with the FEROS spectrograph. The planet orbits a V = 13.68 solar analogue in a P=5.817 60^{+0.000 03}_{-0.000 03} d orbit, and has a radius of 0.93^{+0.10}_{-0.07}R_J …
Pico-charged intermediate particles rescue dark matter interpretation of 511 keV signal
Farzan, Y.; Rajaee, M.
Various alleged indirect dark matter search signals, such as the 511 keV line from galaxy center or the PAMELA/AMS02 signal, are often challenged by the absence of corresponding signal from dwarf galaxies and/or by the absence of an impact on CMB through delayed recombination. We propose a novel scenario that can avoid these bounds based on the de…
Constraints on the Progenitor of SN 2010jl and Pre-existing Hot Dust in its Surrounding Medium
Van Dyk, Schuyler D.; Filippenko, Alexei V.; Kelly, Patrick L. +6 more
A search for the progenitor of SN 2010jl, an unusually luminous core-collapse supernova of Type IIn, using pre-explosion Hubble/WFPC2 and Spitzer/IRAC images of the region, yielded upper limits on the UV and near-infrared (IR) fluxes from any candidate star. These upper limits constrain the luminosity and effective temperature of the progenitor, t…
Abundance Analyses of the New R Coronae Borealis Stars: ASAS-RCB-8 and ASAS-RCB-10
Kamath, Devika; Pandey, Gajendra; Kameswara Rao, N. +3 more
Abundance analyses of the two newly discovered R Coronae Borealis (RCB) stars ASAS-RCB-8 and ASAS-RCB-10 were conducted using high-resolution optical spectra and model atmospheres. Their chemical compositions place the pair among the majority class of RCBs. ASAS-RCB-10 is one of the most N-poor majority RCBs with an above average O abundance. Rela…
Origin of X-rays in the low state of the FSRQ 3C 273: evidence of inverse Compton emission
Gupta, Alok C.; Wiita, Paul J.; Dewangan, Gulab C. +2 more
We analyse the 2.5-10 keV X-ray spectra of the luminous quasar 3C 273 and simultaneous observations in UV wavelengths from XMM-Newton between 2000 and 2015. The lowest flux level ever was observed in 2015. The continuum emission from 3C 273 is generally best described by an absorbed power-law but during extremely low states the addition of fluores…